/*
 * Copyright © 2016 Bas Nieuwenhuizen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#include "ac_nir_to_llvm.h"

#include "ac_binary.h"
#include "ac_llvm_build.h"
#include "ac_llvm_util.h"
#include "ac_shader_abi.h"
#include "ac_shader_util.h"
#include "nir/nir.h"
#include "nir/nir_deref.h"
#include "sid.h"
#include "util/bitscan.h"
#include "util/u_math.h"
#include <llvm/Config/llvm-config.h>

struct ac_nir_context {
   struct ac_llvm_context ac;
   struct ac_shader_abi *abi;
   const struct ac_shader_args *args;

   gl_shader_stage stage;
   shader_info *info;

   LLVMValueRef *ssa_defs;

   LLVMValueRef scratch;
   LLVMValueRef constant_data;

   struct hash_table *defs;
   struct hash_table *phis;
   struct hash_table *vars;
   struct hash_table *verified_interp;

   LLVMValueRef main_function;
   LLVMBasicBlockRef continue_block;
   LLVMBasicBlockRef break_block;
};

static LLVMValueRef get_sampler_desc_index(struct ac_nir_context *ctx, nir_deref_instr *deref_instr,
                                           const nir_instr *instr, bool image);

static LLVMValueRef get_sampler_desc(struct ac_nir_context *ctx, nir_deref_instr *deref_instr,
                                     enum ac_descriptor_type desc_type, const nir_instr *instr,
                                     LLVMValueRef index, bool image, bool write);

static LLVMTypeRef get_def_type(struct ac_nir_context *ctx, const nir_ssa_def *def)
{
   LLVMTypeRef type = LLVMIntTypeInContext(ctx->ac.context, def->bit_size);
   if (def->num_components > 1) {
      type = LLVMVectorType(type, def->num_components);
   }
   return type;
}

static LLVMValueRef get_src(struct ac_nir_context *nir, nir_src src)
{
   assert(src.is_ssa);
   return nir->ssa_defs[src.ssa->index];
}

static LLVMValueRef get_memory_ptr(struct ac_nir_context *ctx, nir_src src, unsigned bit_size)
{
   LLVMValueRef ptr = get_src(ctx, src);
   ptr = LLVMBuildGEP(ctx->ac.builder, ctx->ac.lds, &ptr, 1, "");
   int addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));

   LLVMTypeRef type = LLVMIntTypeInContext(ctx->ac.context, bit_size);

   return LLVMBuildBitCast(ctx->ac.builder, ptr, LLVMPointerType(type, addr_space), "");
}

static LLVMBasicBlockRef get_block(struct ac_nir_context *nir, const struct nir_block *b)
{
   struct hash_entry *entry = _mesa_hash_table_search(nir->defs, b);
   return (LLVMBasicBlockRef)entry->data;
}

static LLVMValueRef get_alu_src(struct ac_nir_context *ctx, nir_alu_src src,
                                unsigned num_components)
{
   LLVMValueRef value = get_src(ctx, src.src);
   bool need_swizzle = false;

   assert(value);
   unsigned src_components = ac_get_llvm_num_components(value);
   for (unsigned i = 0; i < num_components; ++i) {
      assert(src.swizzle[i] < src_components);
      if (src.swizzle[i] != i)
         need_swizzle = true;
   }

   if (need_swizzle || num_components != src_components) {
      LLVMValueRef masks[] = {LLVMConstInt(ctx->ac.i32, src.swizzle[0], false),
                              LLVMConstInt(ctx->ac.i32, src.swizzle[1], false),
                              LLVMConstInt(ctx->ac.i32, src.swizzle[2], false),
                              LLVMConstInt(ctx->ac.i32, src.swizzle[3], false)};

      if (src_components > 1 && num_components == 1) {
         value = LLVMBuildExtractElement(ctx->ac.builder, value, masks[0], "");
      } else if (src_components == 1 && num_components > 1) {
         LLVMValueRef values[] = {value, value, value, value};
         value = ac_build_gather_values(&ctx->ac, values, num_components);
      } else {
         LLVMValueRef swizzle = LLVMConstVector(masks, num_components);
         value = LLVMBuildShuffleVector(ctx->ac.builder, value, value, swizzle, "");
      }
   }
   assert(!src.negate);
   assert(!src.abs);
   return value;
}

static LLVMValueRef emit_int_cmp(struct ac_llvm_context *ctx, LLVMIntPredicate pred,
                                 LLVMValueRef src0, LLVMValueRef src1)
{
   LLVMTypeRef src0_type = LLVMTypeOf(src0);
   LLVMTypeRef src1_type = LLVMTypeOf(src1);

   if (LLVMGetTypeKind(src0_type) == LLVMPointerTypeKind &&
       LLVMGetTypeKind(src1_type) != LLVMPointerTypeKind) {
      src1 = LLVMBuildIntToPtr(ctx->builder, src1, src0_type, "");
   } else if (LLVMGetTypeKind(src1_type) == LLVMPointerTypeKind &&
              LLVMGetTypeKind(src0_type) != LLVMPointerTypeKind) {
      src0 = LLVMBuildIntToPtr(ctx->builder, src0, src1_type, "");
   }

   return LLVMBuildICmp(ctx->builder, pred, src0, src1, "");
}

static LLVMValueRef emit_float_cmp(struct ac_llvm_context *ctx, LLVMRealPredicate pred,
                                   LLVMValueRef src0, LLVMValueRef src1)
{
   src0 = ac_to_float(ctx, src0);
   src1 = ac_to_float(ctx, src1);
   return LLVMBuildFCmp(ctx->builder, pred, src0, src1, "");
}

static LLVMValueRef emit_intrin_1f_param(struct ac_llvm_context *ctx, const char *intrin,
                                         LLVMTypeRef result_type, LLVMValueRef src0)
{
   char name[64], type[64];
   LLVMValueRef params[] = {
      ac_to_float(ctx, src0),
   };

   ac_build_type_name_for_intr(LLVMTypeOf(params[0]), type, sizeof(type));
   ASSERTED const int length = snprintf(name, sizeof(name), "%s.%s", intrin, type);
   assert(length < sizeof(name));
   return ac_build_intrinsic(ctx, name, result_type, params, 1, AC_FUNC_ATTR_READNONE);
}

static LLVMValueRef emit_intrin_1f_param_scalar(struct ac_llvm_context *ctx, const char *intrin,
                                                LLVMTypeRef result_type, LLVMValueRef src0)
{
   if (LLVMGetTypeKind(result_type) != LLVMVectorTypeKind)
      return emit_intrin_1f_param(ctx, intrin, result_type, src0);

   LLVMTypeRef elem_type = LLVMGetElementType(result_type);
   LLVMValueRef ret = LLVMGetUndef(result_type);

   /* Scalarize the intrinsic, because vectors are not supported. */
   for (unsigned i = 0; i < LLVMGetVectorSize(result_type); i++) {
      char name[64], type[64];
      LLVMValueRef params[] = {
         ac_to_float(ctx, ac_llvm_extract_elem(ctx, src0, i)),
      };

      ac_build_type_name_for_intr(LLVMTypeOf(params[0]), type, sizeof(type));
      ASSERTED const int length = snprintf(name, sizeof(name), "%s.%s", intrin, type);
      assert(length < sizeof(name));
      ret = LLVMBuildInsertElement(
         ctx->builder, ret,
         ac_build_intrinsic(ctx, name, elem_type, params, 1, AC_FUNC_ATTR_READNONE),
         LLVMConstInt(ctx->i32, i, 0), "");
   }
   return ret;
}

static LLVMValueRef emit_intrin_2f_param(struct ac_llvm_context *ctx, const char *intrin,
                                         LLVMTypeRef result_type, LLVMValueRef src0,
                                         LLVMValueRef src1)
{
   char name[64], type[64];
   LLVMValueRef params[] = {
      ac_to_float(ctx, src0),
      ac_to_float(ctx, src1),
   };

   ac_build_type_name_for_intr(LLVMTypeOf(params[0]), type, sizeof(type));
   ASSERTED const int length = snprintf(name, sizeof(name), "%s.%s", intrin, type);
   assert(length < sizeof(name));
   return ac_build_intrinsic(ctx, name, result_type, params, 2, AC_FUNC_ATTR_READNONE);
}

static LLVMValueRef emit_intrin_3f_param(struct ac_llvm_context *ctx, const char *intrin,
                                         LLVMTypeRef result_type, LLVMValueRef src0,
                                         LLVMValueRef src1, LLVMValueRef src2)
{
   char name[64], type[64];
   LLVMValueRef params[] = {
      ac_to_float(ctx, src0),
      ac_to_float(ctx, src1),
      ac_to_float(ctx, src2),
   };

   ac_build_type_name_for_intr(LLVMTypeOf(params[0]), type, sizeof(type));
   ASSERTED const int length = snprintf(name, sizeof(name), "%s.%s", intrin, type);
   assert(length < sizeof(name));
   return ac_build_intrinsic(ctx, name, result_type, params, 3, AC_FUNC_ATTR_READNONE);
}

static LLVMValueRef emit_bcsel(struct ac_llvm_context *ctx, LLVMValueRef src0, LLVMValueRef src1,
                               LLVMValueRef src2)
{
   LLVMTypeRef src1_type = LLVMTypeOf(src1);
   LLVMTypeRef src2_type = LLVMTypeOf(src2);

   if (LLVMGetTypeKind(src1_type) == LLVMPointerTypeKind &&
       LLVMGetTypeKind(src2_type) != LLVMPointerTypeKind) {
      src2 = LLVMBuildIntToPtr(ctx->builder, src2, src1_type, "");
   } else if (LLVMGetTypeKind(src2_type) == LLVMPointerTypeKind &&
              LLVMGetTypeKind(src1_type) != LLVMPointerTypeKind) {
      src1 = LLVMBuildIntToPtr(ctx->builder, src1, src2_type, "");
   }

   return LLVMBuildSelect(ctx->builder, src0, ac_to_integer_or_pointer(ctx, src1),
                          ac_to_integer_or_pointer(ctx, src2), "");
}

static LLVMValueRef emit_iabs(struct ac_llvm_context *ctx, LLVMValueRef src0)
{
   return ac_build_imax(ctx, src0, LLVMBuildNeg(ctx->builder, src0, ""));
}

static LLVMValueRef emit_uint_carry(struct ac_llvm_context *ctx, const char *intrin,
                                    LLVMValueRef src0, LLVMValueRef src1)
{
   LLVMTypeRef ret_type;
   LLVMTypeRef types[] = {ctx->i32, ctx->i1};
   LLVMValueRef res;
   LLVMValueRef params[] = {src0, src1};
   ret_type = LLVMStructTypeInContext(ctx->context, types, 2, true);

   res = ac_build_intrinsic(ctx, intrin, ret_type, params, 2, AC_FUNC_ATTR_READNONE);

   res = LLVMBuildExtractValue(ctx->builder, res, 1, "");
   res = LLVMBuildZExt(ctx->builder, res, ctx->i32, "");
   return res;
}

static LLVMValueRef emit_b2f(struct ac_llvm_context *ctx, LLVMValueRef src0, unsigned bitsize)
{
   assert(ac_get_elem_bits(ctx, LLVMTypeOf(src0)) == 1);

   switch (bitsize) {
   case 16:
      if (LLVMGetTypeKind(LLVMTypeOf(src0)) == LLVMVectorTypeKind) {
         assert(LLVMGetVectorSize(LLVMTypeOf(src0)) == 2);
         LLVMValueRef f[] = {
            LLVMBuildSelect(ctx->builder, ac_llvm_extract_elem(ctx, src0, 0),
                            ctx->f16_1, ctx->f16_0, ""),
            LLVMBuildSelect(ctx->builder, ac_llvm_extract_elem(ctx, src0, 1),
                            ctx->f16_1, ctx->f16_0, ""),
         };
         return ac_build_gather_values(ctx, f, 2);
      }
      return LLVMBuildSelect(ctx->builder, src0, ctx->f16_1, ctx->f16_0, "");
   case 32:
      return LLVMBuildSelect(ctx->builder, src0, ctx->f32_1, ctx->f32_0, "");
   case 64:
      return LLVMBuildSelect(ctx->builder, src0, ctx->f64_1, ctx->f64_0, "");
   default:
      unreachable("Unsupported bit size.");
   }
}

static LLVMValueRef emit_f2b(struct ac_llvm_context *ctx, LLVMValueRef src0)
{
   src0 = ac_to_float(ctx, src0);
   LLVMValueRef zero = LLVMConstNull(LLVMTypeOf(src0));
   return LLVMBuildFCmp(ctx->builder, LLVMRealUNE, src0, zero, "");
}

static LLVMValueRef emit_b2i(struct ac_llvm_context *ctx, LLVMValueRef src0, unsigned bitsize)
{
   switch (bitsize) {
   case 8:
      return LLVMBuildSelect(ctx->builder, src0, ctx->i8_1, ctx->i8_0, "");
   case 16:
      return LLVMBuildSelect(ctx->builder, src0, ctx->i16_1, ctx->i16_0, "");
   case 32:
      return LLVMBuildSelect(ctx->builder, src0, ctx->i32_1, ctx->i32_0, "");
   case 64:
      return LLVMBuildSelect(ctx->builder, src0, ctx->i64_1, ctx->i64_0, "");
   default:
      unreachable("Unsupported bit size.");
   }
}

static LLVMValueRef emit_i2b(struct ac_llvm_context *ctx, LLVMValueRef src0)
{
   LLVMValueRef zero = LLVMConstNull(LLVMTypeOf(src0));
   return LLVMBuildICmp(ctx->builder, LLVMIntNE, src0, zero, "");
}

static LLVMValueRef emit_f2f16(struct ac_llvm_context *ctx, LLVMValueRef src0)
{
   LLVMValueRef result;
   LLVMValueRef cond = NULL;

   src0 = ac_to_float(ctx, src0);
   result = LLVMBuildFPTrunc(ctx->builder, src0, ctx->f16, "");

   if (ctx->chip_class >= GFX8) {
      LLVMValueRef args[2];
      /* Check if the result is a denormal - and flush to 0 if so. */
      args[0] = result;
      args[1] = LLVMConstInt(ctx->i32, N_SUBNORMAL | P_SUBNORMAL, false);
      cond =
         ac_build_intrinsic(ctx, "llvm.amdgcn.class.f16", ctx->i1, args, 2, AC_FUNC_ATTR_READNONE);
   }

   /* need to convert back up to f32 */
   result = LLVMBuildFPExt(ctx->builder, result, ctx->f32, "");

   if (ctx->chip_class >= GFX8)
      result = LLVMBuildSelect(ctx->builder, cond, ctx->f32_0, result, "");
   else {
      /* for GFX6-GFX7 */
      /* 0x38800000 is smallest half float value (2^-14) in 32-bit float,
       * so compare the result and flush to 0 if it's smaller.
       */
      LLVMValueRef temp, cond2;
      temp = emit_intrin_1f_param(ctx, "llvm.fabs", ctx->f32, result);
      cond = LLVMBuildFCmp(
         ctx->builder, LLVMRealOGT,
         LLVMBuildBitCast(ctx->builder, LLVMConstInt(ctx->i32, 0x38800000, false), ctx->f32, ""),
         temp, "");
      cond2 = LLVMBuildFCmp(ctx->builder, LLVMRealONE, temp, ctx->f32_0, "");
      cond = LLVMBuildAnd(ctx->builder, cond, cond2, "");
      result = LLVMBuildSelect(ctx->builder, cond, ctx->f32_0, result, "");
   }
   return result;
}

static LLVMValueRef emit_umul_high(struct ac_llvm_context *ctx, LLVMValueRef src0,
                                   LLVMValueRef src1)
{
   LLVMValueRef dst64, result;
   src0 = LLVMBuildZExt(ctx->builder, src0, ctx->i64, "");
   src1 = LLVMBuildZExt(ctx->builder, src1, ctx->i64, "");

   dst64 = LLVMBuildMul(ctx->builder, src0, src1, "");
   dst64 = LLVMBuildLShr(ctx->builder, dst64, LLVMConstInt(ctx->i64, 32, false), "");
   result = LLVMBuildTrunc(ctx->builder, dst64, ctx->i32, "");
   return result;
}

static LLVMValueRef emit_imul_high(struct ac_llvm_context *ctx, LLVMValueRef src0,
                                   LLVMValueRef src1)
{
   LLVMValueRef dst64, result;
   src0 = LLVMBuildSExt(ctx->builder, src0, ctx->i64, "");
   src1 = LLVMBuildSExt(ctx->builder, src1, ctx->i64, "");

   dst64 = LLVMBuildMul(ctx->builder, src0, src1, "");
   dst64 = LLVMBuildAShr(ctx->builder, dst64, LLVMConstInt(ctx->i64, 32, false), "");
   result = LLVMBuildTrunc(ctx->builder, dst64, ctx->i32, "");
   return result;
}

static LLVMValueRef emit_bfm(struct ac_llvm_context *ctx, LLVMValueRef bits, LLVMValueRef offset)
{
   /* mask = ((1 << bits) - 1) << offset */
   return LLVMBuildShl(
      ctx->builder,
      LLVMBuildSub(ctx->builder, LLVMBuildShl(ctx->builder, ctx->i32_1, bits, ""), ctx->i32_1, ""),
      offset, "");
}

static LLVMValueRef emit_bitfield_select(struct ac_llvm_context *ctx, LLVMValueRef mask,
                                         LLVMValueRef insert, LLVMValueRef base)
{
   /* Calculate:
    *   (mask & insert) | (~mask & base) = base ^ (mask & (insert ^ base))
    * Use the right-hand side, which the LLVM backend can convert to V_BFI.
    */
   return LLVMBuildXor(
      ctx->builder, base,
      LLVMBuildAnd(ctx->builder, mask, LLVMBuildXor(ctx->builder, insert, base, ""), ""), "");
}

static LLVMValueRef emit_pack_2x16(struct ac_llvm_context *ctx, LLVMValueRef src0,
                                   LLVMValueRef (*pack)(struct ac_llvm_context *ctx,
                                                        LLVMValueRef args[2]))
{
   LLVMValueRef comp[2];

   src0 = ac_to_float(ctx, src0);
   comp[0] = LLVMBuildExtractElement(ctx->builder, src0, ctx->i32_0, "");
   comp[1] = LLVMBuildExtractElement(ctx->builder, src0, ctx->i32_1, "");

   return LLVMBuildBitCast(ctx->builder, pack(ctx, comp), ctx->i32, "");
}

static LLVMValueRef emit_unpack_half_2x16(struct ac_llvm_context *ctx, LLVMValueRef src0)
{
   LLVMValueRef const16 = LLVMConstInt(ctx->i32, 16, false);
   LLVMValueRef temps[2], val;
   int i;

   for (i = 0; i < 2; i++) {
      val = i == 1 ? LLVMBuildLShr(ctx->builder, src0, const16, "") : src0;
      val = LLVMBuildTrunc(ctx->builder, val, ctx->i16, "");
      val = LLVMBuildBitCast(ctx->builder, val, ctx->f16, "");
      temps[i] = LLVMBuildFPExt(ctx->builder, val, ctx->f32, "");
   }
   return ac_build_gather_values(ctx, temps, 2);
}

static LLVMValueRef emit_ddxy(struct ac_nir_context *ctx, nir_op op, LLVMValueRef src0)
{
   unsigned mask;
   int idx;
   LLVMValueRef result;

   if (op == nir_op_fddx_fine)
      mask = AC_TID_MASK_LEFT;
   else if (op == nir_op_fddy_fine)
      mask = AC_TID_MASK_TOP;
   else
      mask = AC_TID_MASK_TOP_LEFT;

   /* for DDX we want to next X pixel, DDY next Y pixel. */
   if (op == nir_op_fddx_fine || op == nir_op_fddx_coarse || op == nir_op_fddx)
      idx = 1;
   else
      idx = 2;

   result = ac_build_ddxy(&ctx->ac, mask, idx, src0);
   return result;
}

struct waterfall_context {
   LLVMBasicBlockRef phi_bb[2];
   bool use_waterfall;
};

/* To deal with divergent descriptors we can create a loop that handles all
 * lanes with the same descriptor on a given iteration (henceforth a
 * waterfall loop).
 *
 * These helper create the begin and end of the loop leaving the caller
 * to implement the body.
 *
 * params:
 *  - ctx is the usal nir context
 *  - wctx is a temporary struct containing some loop info. Can be left uninitialized.
 *  - value is the possibly divergent value for which we built the loop
 *  - divergent is whether value is actually divergent. If false we just pass
 *     things through.
 */
static LLVMValueRef enter_waterfall(struct ac_nir_context *ctx, struct waterfall_context *wctx,
                                    LLVMValueRef value, bool divergent)
{
   /* If the app claims the value is divergent but it is constant we can
    * end up with a dynamic index of NULL. */
   if (!value)
      divergent = false;

   wctx->use_waterfall = divergent;
   if (!divergent)
      return value;

   ac_build_bgnloop(&ctx->ac, 6000);

   LLVMValueRef scalar_value = ac_build_readlane(&ctx->ac, value, NULL);

   LLVMValueRef active =
      LLVMBuildICmp(ctx->ac.builder, LLVMIntEQ, value, scalar_value, "uniform_active");

   wctx->phi_bb[0] = LLVMGetInsertBlock(ctx->ac.builder);
   ac_build_ifcc(&ctx->ac, active, 6001);

   return scalar_value;
}

static LLVMValueRef exit_waterfall(struct ac_nir_context *ctx, struct waterfall_context *wctx,
                                   LLVMValueRef value)
{
   LLVMValueRef ret = NULL;
   LLVMValueRef phi_src[2];
   LLVMValueRef cc_phi_src[2] = {
      LLVMConstInt(ctx->ac.i32, 0, false),
      LLVMConstInt(ctx->ac.i32, 0xffffffff, false),
   };

   if (!wctx->use_waterfall)
      return value;

   wctx->phi_bb[1] = LLVMGetInsertBlock(ctx->ac.builder);

   ac_build_endif(&ctx->ac, 6001);

   if (value) {
      phi_src[0] = LLVMGetUndef(LLVMTypeOf(value));
      phi_src[1] = value;

      ret = ac_build_phi(&ctx->ac, LLVMTypeOf(value), 2, phi_src, wctx->phi_bb);
   }

   /*
    * By using the optimization barrier on the exit decision, we decouple
    * the operations from the break, and hence avoid LLVM hoisting the
    * opteration into the break block.
    */
   LLVMValueRef cc = ac_build_phi(&ctx->ac, ctx->ac.i32, 2, cc_phi_src, wctx->phi_bb);
   ac_build_optimization_barrier(&ctx->ac, &cc);

   LLVMValueRef active =
      LLVMBuildICmp(ctx->ac.builder, LLVMIntNE, cc, ctx->ac.i32_0, "uniform_active2");
   ac_build_ifcc(&ctx->ac, active, 6002);
   ac_build_break(&ctx->ac);
   ac_build_endif(&ctx->ac, 6002);

   ac_build_endloop(&ctx->ac, 6000);
   return ret;
}

static void visit_alu(struct ac_nir_context *ctx, const nir_alu_instr *instr)
{
   LLVMValueRef src[4], result = NULL;
   unsigned num_components = instr->dest.dest.ssa.num_components;
   unsigned src_components;
   LLVMTypeRef def_type = get_def_type(ctx, &instr->dest.dest.ssa);

   assert(nir_op_infos[instr->op].num_inputs <= ARRAY_SIZE(src));
   switch (instr->op) {
   case nir_op_vec2:
   case nir_op_vec3:
   case nir_op_vec4:
   case nir_op_unpack_32_2x16:
   case nir_op_unpack_64_2x32:
   case nir_op_unpack_64_4x16:
      src_components = 1;
      break;
   case nir_op_pack_half_2x16:
   case nir_op_pack_snorm_2x16:
   case nir_op_pack_unorm_2x16:
   case nir_op_pack_32_2x16:
   case nir_op_pack_64_2x32:
      src_components = 2;
      break;
   case nir_op_unpack_half_2x16:
      src_components = 1;
      break;
   case nir_op_cube_face_coord:
   case nir_op_cube_face_index:
      src_components = 3;
      break;
   case nir_op_pack_64_4x16:
      src_components = 4;
      break;
   default:
      src_components = num_components;
      break;
   }
   for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++)
      src[i] = get_alu_src(ctx, instr->src[i], src_components);

   switch (instr->op) {
   case nir_op_mov:
      result = src[0];
      break;
   case nir_op_fneg:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = LLVMBuildFNeg(ctx->ac.builder, src[0], "");
      if (ctx->ac.float_mode == AC_FLOAT_MODE_DENORM_FLUSH_TO_ZERO) {
         /* fneg will be optimized by backend compiler with sign
          * bit removed via XOR. This is probably a LLVM bug.
          */
         result = ac_build_canonicalize(&ctx->ac, result, instr->dest.dest.ssa.bit_size);
      }
      break;
   case nir_op_ineg:
      result = LLVMBuildNeg(ctx->ac.builder, src[0], "");
      break;
   case nir_op_inot:
      result = LLVMBuildNot(ctx->ac.builder, src[0], "");
      break;
   case nir_op_iadd:
      result = LLVMBuildAdd(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_fadd:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      src[1] = ac_to_float(&ctx->ac, src[1]);
      result = LLVMBuildFAdd(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_fsub:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      src[1] = ac_to_float(&ctx->ac, src[1]);
      result = LLVMBuildFSub(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_isub:
      result = LLVMBuildSub(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_imul:
      result = LLVMBuildMul(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_imod:
      result = LLVMBuildSRem(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_umod:
      result = LLVMBuildURem(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_irem:
      result = LLVMBuildSRem(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_idiv:
      result = LLVMBuildSDiv(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_udiv:
      result = LLVMBuildUDiv(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_fmul:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      src[1] = ac_to_float(&ctx->ac, src[1]);
      result = LLVMBuildFMul(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_frcp:
      /* For doubles, we need precise division to pass GLCTS. */
      if (ctx->ac.float_mode == AC_FLOAT_MODE_DEFAULT_OPENGL && ac_get_type_size(def_type) == 8) {
         result = LLVMBuildFDiv(ctx->ac.builder, ctx->ac.f64_1, ac_to_float(&ctx->ac, src[0]), "");
      } else {
         result = emit_intrin_1f_param_scalar(&ctx->ac, "llvm.amdgcn.rcp",
                                              ac_to_float_type(&ctx->ac, def_type), src[0]);
      }
      if (ctx->abi->clamp_div_by_zero)
         result = ac_build_fmin(&ctx->ac, result,
                                LLVMConstReal(ac_to_float_type(&ctx->ac, def_type), FLT_MAX));
      break;
   case nir_op_iand:
      result = LLVMBuildAnd(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ior:
      result = LLVMBuildOr(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ixor:
      result = LLVMBuildXor(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ishl:
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) <
          ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildZExt(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      else if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) >
               ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildTrunc(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      result = LLVMBuildShl(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ishr:
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) <
          ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildZExt(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      else if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) >
               ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildTrunc(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      result = LLVMBuildAShr(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ushr:
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) <
          ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildZExt(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      else if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[1])) >
               ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])))
         src[1] = LLVMBuildTrunc(ctx->ac.builder, src[1], LLVMTypeOf(src[0]), "");
      result = LLVMBuildLShr(ctx->ac.builder, src[0], src[1], "");
      break;
   case nir_op_ilt:
      result = emit_int_cmp(&ctx->ac, LLVMIntSLT, src[0], src[1]);
      break;
   case nir_op_ine:
      result = emit_int_cmp(&ctx->ac, LLVMIntNE, src[0], src[1]);
      break;
   case nir_op_ieq:
      result = emit_int_cmp(&ctx->ac, LLVMIntEQ, src[0], src[1]);
      break;
   case nir_op_ige:
      result = emit_int_cmp(&ctx->ac, LLVMIntSGE, src[0], src[1]);
      break;
   case nir_op_ult:
      result = emit_int_cmp(&ctx->ac, LLVMIntULT, src[0], src[1]);
      break;
   case nir_op_uge:
      result = emit_int_cmp(&ctx->ac, LLVMIntUGE, src[0], src[1]);
      break;
   case nir_op_feq:
      result = emit_float_cmp(&ctx->ac, LLVMRealOEQ, src[0], src[1]);
      break;
   case nir_op_fneu:
      result = emit_float_cmp(&ctx->ac, LLVMRealUNE, src[0], src[1]);
      break;
   case nir_op_flt:
      result = emit_float_cmp(&ctx->ac, LLVMRealOLT, src[0], src[1]);
      break;
   case nir_op_fge:
      result = emit_float_cmp(&ctx->ac, LLVMRealOGE, src[0], src[1]);
      break;
   case nir_op_fabs:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.fabs", ac_to_float_type(&ctx->ac, def_type), src[0]);
      if (ctx->ac.float_mode == AC_FLOAT_MODE_DENORM_FLUSH_TO_ZERO) {
         /* fabs will be optimized by backend compiler with sign
          * bit removed via AND.
          */
         result = ac_build_canonicalize(&ctx->ac, result, instr->dest.dest.ssa.bit_size);
      }
      break;
   case nir_op_fsat:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = ac_build_fsat(&ctx->ac, src[0],
                             ac_to_float_type(&ctx->ac, def_type));
      break;
   case nir_op_iabs:
      result = emit_iabs(&ctx->ac, src[0]);
      break;
   case nir_op_imax:
      result = ac_build_imax(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_imin:
      result = ac_build_imin(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_umax:
      result = ac_build_umax(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_umin:
      result = ac_build_umin(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_isign:
      result = ac_build_isign(&ctx->ac, src[0]);
      break;
   case nir_op_fsign:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = ac_build_fsign(&ctx->ac, src[0]);
      break;
   case nir_op_ffloor:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.floor", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_ftrunc:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.trunc", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fceil:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.ceil", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fround_even:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.rint", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_ffract:
      result = emit_intrin_1f_param_scalar(&ctx->ac, "llvm.amdgcn.fract",
                                           ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fsin:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.sin", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fcos:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.cos", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fsqrt:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.sqrt", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_fexp2:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.exp2", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_flog2:
      result =
         emit_intrin_1f_param(&ctx->ac, "llvm.log2", ac_to_float_type(&ctx->ac, def_type), src[0]);
      break;
   case nir_op_frsq:
      result = emit_intrin_1f_param_scalar(&ctx->ac, "llvm.amdgcn.rsq",
                                           ac_to_float_type(&ctx->ac, def_type), src[0]);
      if (ctx->abi->clamp_div_by_zero)
         result = ac_build_fmin(&ctx->ac, result,
                                LLVMConstReal(ac_to_float_type(&ctx->ac, def_type), FLT_MAX));
      break;
   case nir_op_frexp_exp:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = ac_build_frexp_exp(&ctx->ac, src[0], ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])));
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) == 16)
         result = LLVMBuildSExt(ctx->ac.builder, result, ctx->ac.i32, "");
      break;
   case nir_op_frexp_sig:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = ac_build_frexp_mant(&ctx->ac, src[0], instr->dest.dest.ssa.bit_size);
      break;
   case nir_op_fpow:
      result = emit_intrin_2f_param(&ctx->ac, "llvm.pow", ac_to_float_type(&ctx->ac, def_type),
                                    src[0], src[1]);
      break;
   case nir_op_fmax:
      result = emit_intrin_2f_param(&ctx->ac, "llvm.maxnum", ac_to_float_type(&ctx->ac, def_type),
                                    src[0], src[1]);
      if (ctx->ac.chip_class < GFX9 && instr->dest.dest.ssa.bit_size == 32) {
         /* Only pre-GFX9 chips do not flush denorms. */
         result = ac_build_canonicalize(&ctx->ac, result, instr->dest.dest.ssa.bit_size);
      }
      break;
   case nir_op_fmin:
      result = emit_intrin_2f_param(&ctx->ac, "llvm.minnum", ac_to_float_type(&ctx->ac, def_type),
                                    src[0], src[1]);
      if (ctx->ac.chip_class < GFX9 && instr->dest.dest.ssa.bit_size == 32) {
         /* Only pre-GFX9 chips do not flush denorms. */
         result = ac_build_canonicalize(&ctx->ac, result, instr->dest.dest.ssa.bit_size);
      }
      break;
   case nir_op_ffma:
      /* FMA is slow on gfx6-8, so it shouldn't be used. */
      assert(instr->dest.dest.ssa.bit_size != 32 || ctx->ac.chip_class >= GFX9);
      result = emit_intrin_3f_param(&ctx->ac, "llvm.fma", ac_to_float_type(&ctx->ac, def_type),
                                    src[0], src[1], src[2]);
      break;
   case nir_op_ldexp:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      if (ac_get_elem_bits(&ctx->ac, def_type) == 32)
         result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.ldexp.f32", ctx->ac.f32, src, 2,
                                     AC_FUNC_ATTR_READNONE);
      else if (ac_get_elem_bits(&ctx->ac, def_type) == 16)
         result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.ldexp.f16", ctx->ac.f16, src, 2,
                                     AC_FUNC_ATTR_READNONE);
      else
         result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.ldexp.f64", ctx->ac.f64, src, 2,
                                     AC_FUNC_ATTR_READNONE);
      break;
   case nir_op_bfm:
      result = emit_bfm(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_bitfield_select:
      result = emit_bitfield_select(&ctx->ac, src[0], src[1], src[2]);
      break;
   case nir_op_ubfe:
      result = ac_build_bfe(&ctx->ac, src[0], src[1], src[2], false);
      break;
   case nir_op_ibfe:
      result = ac_build_bfe(&ctx->ac, src[0], src[1], src[2], true);
      break;
   case nir_op_bitfield_reverse:
      result = ac_build_bitfield_reverse(&ctx->ac, src[0]);
      break;
   case nir_op_bit_count:
      result = ac_build_bit_count(&ctx->ac, src[0]);
      break;
   case nir_op_vec2:
   case nir_op_vec3:
   case nir_op_vec4:
      for (unsigned i = 0; i < nir_op_infos[instr->op].num_inputs; i++)
         src[i] = ac_to_integer(&ctx->ac, src[i]);
      result = ac_build_gather_values(&ctx->ac, src, num_components);
      break;
   case nir_op_f2i8:
   case nir_op_f2i16:
   case nir_op_f2imp:
   case nir_op_f2i32:
   case nir_op_f2i64:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = LLVMBuildFPToSI(ctx->ac.builder, src[0], def_type, "");
      break;
   case nir_op_f2u8:
   case nir_op_f2u16:
   case nir_op_f2ump:
   case nir_op_f2u32:
   case nir_op_f2u64:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      result = LLVMBuildFPToUI(ctx->ac.builder, src[0], def_type, "");
      break;
   case nir_op_i2f16:
   case nir_op_i2fmp:
   case nir_op_i2f32:
   case nir_op_i2f64:
      result = LLVMBuildSIToFP(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
      break;
   case nir_op_u2f16:
   case nir_op_u2fmp:
   case nir_op_u2f32:
   case nir_op_u2f64:
      result = LLVMBuildUIToFP(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
      break;
   case nir_op_f2f16_rtz:
   case nir_op_f2f16:
   case nir_op_f2fmp:
      src[0] = ac_to_float(&ctx->ac, src[0]);

      /* For OpenGL, we want fast packing with v_cvt_pkrtz_f16, but if we use it,
       * all f32->f16 conversions have to round towards zero, because both scalar
       * and vec2 down-conversions have to round equally.
       */
      if (ctx->ac.float_mode == AC_FLOAT_MODE_DEFAULT_OPENGL || instr->op == nir_op_f2f16_rtz) {
         src[0] = ac_to_float(&ctx->ac, src[0]);

         if (LLVMTypeOf(src[0]) == ctx->ac.f64)
            src[0] = LLVMBuildFPTrunc(ctx->ac.builder, src[0], ctx->ac.f32, "");

         /* Fast path conversion. This only works if NIR is vectorized
          * to vec2 16.
          */
         if (LLVMTypeOf(src[0]) == ctx->ac.v2f32) {
            LLVMValueRef args[] = {
               ac_llvm_extract_elem(&ctx->ac, src[0], 0),
               ac_llvm_extract_elem(&ctx->ac, src[0], 1),
            };
            result = ac_build_cvt_pkrtz_f16(&ctx->ac, args);
            break;
         }

         assert(ac_get_llvm_num_components(src[0]) == 1);
         LLVMValueRef param[2] = {src[0], LLVMGetUndef(ctx->ac.f32)};
         result = ac_build_cvt_pkrtz_f16(&ctx->ac, param);
         result = LLVMBuildExtractElement(ctx->ac.builder, result, ctx->ac.i32_0, "");
      } else {
         if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) < ac_get_elem_bits(&ctx->ac, def_type))
            result =
               LLVMBuildFPExt(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
         else
            result =
               LLVMBuildFPTrunc(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
      }
      break;
   case nir_op_f2f16_rtne:
   case nir_op_f2f32:
   case nir_op_f2f64:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) < ac_get_elem_bits(&ctx->ac, def_type))
         result = LLVMBuildFPExt(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
      else
         result =
            LLVMBuildFPTrunc(ctx->ac.builder, src[0], ac_to_float_type(&ctx->ac, def_type), "");
      break;
   case nir_op_u2u8:
   case nir_op_u2u16:
   case nir_op_u2u32:
   case nir_op_u2u64:
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) < ac_get_elem_bits(&ctx->ac, def_type))
         result = LLVMBuildZExt(ctx->ac.builder, src[0], def_type, "");
      else
         result = LLVMBuildTrunc(ctx->ac.builder, src[0], def_type, "");
      break;
   case nir_op_i2i8:
   case nir_op_i2i16:
   case nir_op_i2imp:
   case nir_op_i2i32:
   case nir_op_i2i64:
      if (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src[0])) < ac_get_elem_bits(&ctx->ac, def_type))
         result = LLVMBuildSExt(ctx->ac.builder, src[0], def_type, "");
      else
         result = LLVMBuildTrunc(ctx->ac.builder, src[0], def_type, "");
      break;
   case nir_op_bcsel:
      result = emit_bcsel(&ctx->ac, src[0], src[1], src[2]);
      break;
   case nir_op_find_lsb:
      result = ac_find_lsb(&ctx->ac, ctx->ac.i32, src[0]);
      break;
   case nir_op_ufind_msb:
      result = ac_build_umsb(&ctx->ac, src[0], ctx->ac.i32);
      break;
   case nir_op_ifind_msb:
      result = ac_build_imsb(&ctx->ac, src[0], ctx->ac.i32);
      break;
   case nir_op_uadd_carry:
      result = emit_uint_carry(&ctx->ac, "llvm.uadd.with.overflow.i32", src[0], src[1]);
      break;
   case nir_op_usub_borrow:
      result = emit_uint_carry(&ctx->ac, "llvm.usub.with.overflow.i32", src[0], src[1]);
      break;
   case nir_op_b2f16:
   case nir_op_b2f32:
   case nir_op_b2f64:
      result = emit_b2f(&ctx->ac, src[0], instr->dest.dest.ssa.bit_size);
      break;
   case nir_op_f2b1:
      result = emit_f2b(&ctx->ac, src[0]);
      break;
   case nir_op_b2i8:
   case nir_op_b2i16:
   case nir_op_b2i32:
   case nir_op_b2i64:
      result = emit_b2i(&ctx->ac, src[0], instr->dest.dest.ssa.bit_size);
      break;
   case nir_op_i2b1:
   case nir_op_b2b1: /* after loads */
      result = emit_i2b(&ctx->ac, src[0]);
      break;
   case nir_op_b2b16: /* before stores */
      result = LLVMBuildZExt(ctx->ac.builder, src[0], ctx->ac.i16, "");
      break;
   case nir_op_b2b32: /* before stores */
      result = LLVMBuildZExt(ctx->ac.builder, src[0], ctx->ac.i32, "");
      break;
   case nir_op_fquantize2f16:
      result = emit_f2f16(&ctx->ac, src[0]);
      break;
   case nir_op_umul_high:
      result = emit_umul_high(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_imul_high:
      result = emit_imul_high(&ctx->ac, src[0], src[1]);
      break;
   case nir_op_pack_half_2x16:
      result = emit_pack_2x16(&ctx->ac, src[0], ac_build_cvt_pkrtz_f16);
      break;
   case nir_op_pack_half_2x16_split:
      src[0] = ac_to_float(&ctx->ac, src[0]);
      src[1] = ac_to_float(&ctx->ac, src[1]);
      result = LLVMBuildBitCast(ctx->ac.builder,
                                ac_build_cvt_pkrtz_f16(&ctx->ac, src),
                                ctx->ac.i32, "");
      break;
   case nir_op_pack_snorm_2x16:
      result = emit_pack_2x16(&ctx->ac, src[0], ac_build_cvt_pknorm_i16);
      break;
   case nir_op_pack_unorm_2x16:
      result = emit_pack_2x16(&ctx->ac, src[0], ac_build_cvt_pknorm_u16);
      break;
   case nir_op_unpack_half_2x16:
      result = emit_unpack_half_2x16(&ctx->ac, src[0]);
      break;
   case nir_op_unpack_half_2x16_split_x: {
      assert(ac_get_llvm_num_components(src[0]) == 1);
      LLVMValueRef tmp = emit_unpack_half_2x16(&ctx->ac, src[0]);
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_0, "");
      break;
   }
   case nir_op_unpack_half_2x16_split_y: {
      assert(ac_get_llvm_num_components(src[0]) == 1);
      LLVMValueRef tmp = emit_unpack_half_2x16(&ctx->ac, src[0]);
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_1, "");
      break;
   }
   case nir_op_fddx:
   case nir_op_fddy:
   case nir_op_fddx_fine:
   case nir_op_fddy_fine:
   case nir_op_fddx_coarse:
   case nir_op_fddy_coarse:
      result = emit_ddxy(ctx, instr->op, src[0]);
      break;

   case nir_op_unpack_64_4x16: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.v4i16, "");
      break;
   }
   case nir_op_pack_64_4x16: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.i64, "");
      break;
   }

   case nir_op_unpack_64_2x32: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0],
            ctx->ac.v2i32, "");
      break;
   }
   case nir_op_unpack_64_2x32_split_x: {
      assert(ac_get_llvm_num_components(src[0]) == 1);
      LLVMValueRef tmp = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.v2i32, "");
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_0, "");
      break;
   }
   case nir_op_unpack_64_2x32_split_y: {
      assert(ac_get_llvm_num_components(src[0]) == 1);
      LLVMValueRef tmp = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.v2i32, "");
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_1, "");
      break;
   }

   case nir_op_pack_64_2x32: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0],
            ctx->ac.i64, "");
      break;
   }
   case nir_op_pack_64_2x32_split: {
      LLVMValueRef tmp = ac_build_gather_values(&ctx->ac, src, 2);
      result = LLVMBuildBitCast(ctx->ac.builder, tmp, ctx->ac.i64, "");
      break;
   }

   case nir_op_pack_32_2x16: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0],
            ctx->ac.i32, "");
      break;
   }
   case nir_op_pack_32_2x16_split: {
      LLVMValueRef tmp = ac_build_gather_values(&ctx->ac, src, 2);
      result = LLVMBuildBitCast(ctx->ac.builder, tmp, ctx->ac.i32, "");
      break;
   }

   case nir_op_unpack_32_2x16: {
      result = LLVMBuildBitCast(ctx->ac.builder, src[0],
            ctx->ac.v2i16, "");
      break;
   }
   case nir_op_unpack_32_2x16_split_x: {
      LLVMValueRef tmp = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.v2i16, "");
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_0, "");
      break;
   }
   case nir_op_unpack_32_2x16_split_y: {
      LLVMValueRef tmp = LLVMBuildBitCast(ctx->ac.builder, src[0], ctx->ac.v2i16, "");
      result = LLVMBuildExtractElement(ctx->ac.builder, tmp, ctx->ac.i32_1, "");
      break;
   }

   case nir_op_cube_face_coord: {
      src[0] = ac_to_float(&ctx->ac, src[0]);
      LLVMValueRef results[2];
      LLVMValueRef in[3];
      for (unsigned chan = 0; chan < 3; chan++)
         in[chan] = ac_llvm_extract_elem(&ctx->ac, src[0], chan);
      results[0] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubesc", ctx->ac.f32, in, 3,
                                      AC_FUNC_ATTR_READNONE);
      results[1] = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubetc", ctx->ac.f32, in, 3,
                                      AC_FUNC_ATTR_READNONE);
      LLVMValueRef ma = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubema", ctx->ac.f32, in, 3,
                                           AC_FUNC_ATTR_READNONE);
      results[0] = ac_build_fdiv(&ctx->ac, results[0], ma);
      results[1] = ac_build_fdiv(&ctx->ac, results[1], ma);
      LLVMValueRef offset = LLVMConstReal(ctx->ac.f32, 0.5);
      results[0] = LLVMBuildFAdd(ctx->ac.builder, results[0], offset, "");
      results[1] = LLVMBuildFAdd(ctx->ac.builder, results[1], offset, "");
      result = ac_build_gather_values(&ctx->ac, results, 2);
      break;
   }

   case nir_op_cube_face_index: {
      src[0] = ac_to_float(&ctx->ac, src[0]);
      LLVMValueRef in[3];
      for (unsigned chan = 0; chan < 3; chan++)
         in[chan] = ac_llvm_extract_elem(&ctx->ac, src[0], chan);
      result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.cubeid", ctx->ac.f32, in, 3,
                                  AC_FUNC_ATTR_READNONE);
      break;
   }

   default:
      fprintf(stderr, "Unknown NIR alu instr: ");
      nir_print_instr(&instr->instr, stderr);
      fprintf(stderr, "\n");
      abort();
   }

   if (result) {
      assert(instr->dest.dest.is_ssa);
      result = ac_to_integer_or_pointer(&ctx->ac, result);
      ctx->ssa_defs[instr->dest.dest.ssa.index] = result;
   }
}

static void visit_load_const(struct ac_nir_context *ctx, const nir_load_const_instr *instr)
{
   LLVMValueRef values[4], value = NULL;
   LLVMTypeRef element_type = LLVMIntTypeInContext(ctx->ac.context, instr->def.bit_size);

   for (unsigned i = 0; i < instr->def.num_components; ++i) {
      switch (instr->def.bit_size) {
      case 1:
         values[i] = LLVMConstInt(element_type, instr->value[i].b, false);
         break;
      case 8:
         values[i] = LLVMConstInt(element_type, instr->value[i].u8, false);
         break;
      case 16:
         values[i] = LLVMConstInt(element_type, instr->value[i].u16, false);
         break;
      case 32:
         values[i] = LLVMConstInt(element_type, instr->value[i].u32, false);
         break;
      case 64:
         values[i] = LLVMConstInt(element_type, instr->value[i].u64, false);
         break;
      default:
         fprintf(stderr, "unsupported nir load_const bit_size: %d\n", instr->def.bit_size);
         abort();
      }
   }
   if (instr->def.num_components > 1) {
      value = LLVMConstVector(values, instr->def.num_components);
   } else
      value = values[0];

   ctx->ssa_defs[instr->def.index] = value;
}

static LLVMValueRef get_buffer_size(struct ac_nir_context *ctx, LLVMValueRef descriptor,
                                    bool in_elements)
{
   LLVMValueRef size =
      LLVMBuildExtractElement(ctx->ac.builder, descriptor, LLVMConstInt(ctx->ac.i32, 2, false), "");

   /* GFX8 only */
   if (ctx->ac.chip_class == GFX8 && in_elements) {
      /* On GFX8, the descriptor contains the size in bytes,
       * but TXQ must return the size in elements.
       * The stride is always non-zero for resources using TXQ.
       */
      LLVMValueRef stride = LLVMBuildExtractElement(ctx->ac.builder, descriptor, ctx->ac.i32_1, "");
      stride = LLVMBuildLShr(ctx->ac.builder, stride, LLVMConstInt(ctx->ac.i32, 16, false), "");
      stride = LLVMBuildAnd(ctx->ac.builder, stride, LLVMConstInt(ctx->ac.i32, 0x3fff, false), "");

      size = LLVMBuildUDiv(ctx->ac.builder, size, stride, "");
   }
   return size;
}

/* Gather4 should follow the same rules as bilinear filtering, but the hardware
 * incorrectly forces nearest filtering if the texture format is integer.
 * The only effect it has on Gather4, which always returns 4 texels for
 * bilinear filtering, is that the final coordinates are off by 0.5 of
 * the texel size.
 *
 * The workaround is to subtract 0.5 from the unnormalized coordinates,
 * or (0.5 / size) from the normalized coordinates.
 *
 * However, cube textures with 8_8_8_8 data formats require a different
 * workaround of overriding the num format to USCALED/SSCALED. This would lose
 * precision in 32-bit data formats, so it needs to be applied dynamically at
 * runtime. In this case, return an i1 value that indicates whether the
 * descriptor was overridden (and hence a fixup of the sampler result is needed).
 */
static LLVMValueRef lower_gather4_integer(struct ac_llvm_context *ctx, nir_variable *var,
                                          struct ac_image_args *args, const nir_tex_instr *instr)
{
   const struct glsl_type *type = glsl_without_array(var->type);
   enum glsl_base_type stype = glsl_get_sampler_result_type(type);
   LLVMValueRef wa_8888 = NULL;
   LLVMValueRef half_texel[2];
   LLVMValueRef result;

   assert(stype == GLSL_TYPE_INT || stype == GLSL_TYPE_UINT);

   if (instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE) {
      LLVMValueRef formats;
      LLVMValueRef data_format;
      LLVMValueRef wa_formats;

      formats = LLVMBuildExtractElement(ctx->builder, args->resource, ctx->i32_1, "");

      data_format = LLVMBuildLShr(ctx->builder, formats, LLVMConstInt(ctx->i32, 20, false), "");
      data_format =
         LLVMBuildAnd(ctx->builder, data_format, LLVMConstInt(ctx->i32, (1u << 6) - 1, false), "");
      wa_8888 = LLVMBuildICmp(ctx->builder, LLVMIntEQ, data_format,
                              LLVMConstInt(ctx->i32, V_008F14_IMG_DATA_FORMAT_8_8_8_8, false), "");

      uint32_t wa_num_format = stype == GLSL_TYPE_UINT
                                  ? S_008F14_NUM_FORMAT(V_008F14_IMG_NUM_FORMAT_USCALED)
                                  : S_008F14_NUM_FORMAT(V_008F14_IMG_NUM_FORMAT_SSCALED);
      wa_formats = LLVMBuildAnd(ctx->builder, formats,
                                LLVMConstInt(ctx->i32, C_008F14_NUM_FORMAT, false), "");
      wa_formats =
         LLVMBuildOr(ctx->builder, wa_formats, LLVMConstInt(ctx->i32, wa_num_format, false), "");

      formats = LLVMBuildSelect(ctx->builder, wa_8888, wa_formats, formats, "");
      args->resource =
         LLVMBuildInsertElement(ctx->builder, args->resource, formats, ctx->i32_1, "");
   }

   if (instr->sampler_dim == GLSL_SAMPLER_DIM_RECT) {
      assert(!wa_8888);
      half_texel[0] = half_texel[1] = LLVMConstReal(ctx->f32, -0.5);
   } else {
      struct ac_image_args resinfo = {0};
      LLVMBasicBlockRef bbs[2];

      LLVMValueRef unnorm = NULL;
      LLVMValueRef default_offset = ctx->f32_0;
      if (instr->sampler_dim == GLSL_SAMPLER_DIM_2D && !instr->is_array) {
         /* In vulkan, whether the sampler uses unnormalized
          * coordinates or not is a dynamic property of the
          * sampler. Hence, to figure out whether or not we
          * need to divide by the texture size, we need to test
          * the sampler at runtime. This tests the bit set by
          * radv_init_sampler().
          */
         LLVMValueRef sampler0 =
            LLVMBuildExtractElement(ctx->builder, args->sampler, ctx->i32_0, "");
         sampler0 = LLVMBuildLShr(ctx->builder, sampler0, LLVMConstInt(ctx->i32, 15, false), "");
         sampler0 = LLVMBuildAnd(ctx->builder, sampler0, ctx->i32_1, "");
         unnorm = LLVMBuildICmp(ctx->builder, LLVMIntEQ, sampler0, ctx->i32_1, "");
         default_offset = LLVMConstReal(ctx->f32, -0.5);
      }

      bbs[0] = LLVMGetInsertBlock(ctx->builder);
      if (wa_8888 || unnorm) {
         assert(!(wa_8888 && unnorm));
         LLVMValueRef not_needed = wa_8888 ? wa_8888 : unnorm;
         /* Skip the texture size query entirely if we don't need it. */
         ac_build_ifcc(ctx, LLVMBuildNot(ctx->builder, not_needed, ""), 2000);
         bbs[1] = LLVMGetInsertBlock(ctx->builder);
      }

      /* Query the texture size. */
      resinfo.dim = ac_get_sampler_dim(ctx->chip_class, instr->sampler_dim, instr->is_array);
      resinfo.opcode = ac_image_get_resinfo;
      resinfo.dmask = 0xf;
      resinfo.lod = ctx->i32_0;
      resinfo.resource = args->resource;
      resinfo.attributes = AC_FUNC_ATTR_READNONE;
      LLVMValueRef size = ac_build_image_opcode(ctx, &resinfo);

      /* Compute -0.5 / size. */
      for (unsigned c = 0; c < 2; c++) {
         half_texel[c] =
            LLVMBuildExtractElement(ctx->builder, size, LLVMConstInt(ctx->i32, c, 0), "");
         half_texel[c] = LLVMBuildUIToFP(ctx->builder, half_texel[c], ctx->f32, "");
         half_texel[c] = ac_build_fdiv(ctx, ctx->f32_1, half_texel[c]);
         half_texel[c] =
            LLVMBuildFMul(ctx->builder, half_texel[c], LLVMConstReal(ctx->f32, -0.5), "");
      }

      if (wa_8888 || unnorm) {
         ac_build_endif(ctx, 2000);

         for (unsigned c = 0; c < 2; c++) {
            LLVMValueRef values[2] = {default_offset, half_texel[c]};
            half_texel[c] = ac_build_phi(ctx, ctx->f32, 2, values, bbs);
         }
      }
   }

   for (unsigned c = 0; c < 2; c++) {
      LLVMValueRef tmp;
      tmp = LLVMBuildBitCast(ctx->builder, args->coords[c], ctx->f32, "");
      args->coords[c] = LLVMBuildFAdd(ctx->builder, tmp, half_texel[c], "");
   }

   args->attributes = AC_FUNC_ATTR_READNONE;
   result = ac_build_image_opcode(ctx, args);

   if (instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE) {
      LLVMValueRef tmp, tmp2;

      /* if the cube workaround is in place, f2i the result. */
      for (unsigned c = 0; c < 4; c++) {
         tmp = LLVMBuildExtractElement(ctx->builder, result, LLVMConstInt(ctx->i32, c, false), "");
         if (stype == GLSL_TYPE_UINT)
            tmp2 = LLVMBuildFPToUI(ctx->builder, tmp, ctx->i32, "");
         else
            tmp2 = LLVMBuildFPToSI(ctx->builder, tmp, ctx->i32, "");
         tmp = LLVMBuildBitCast(ctx->builder, tmp, ctx->i32, "");
         tmp2 = LLVMBuildBitCast(ctx->builder, tmp2, ctx->i32, "");
         tmp = LLVMBuildSelect(ctx->builder, wa_8888, tmp2, tmp, "");
         tmp = LLVMBuildBitCast(ctx->builder, tmp, ctx->f32, "");
         result =
            LLVMBuildInsertElement(ctx->builder, result, tmp, LLVMConstInt(ctx->i32, c, false), "");
      }
   }
   return result;
}

static nir_deref_instr *get_tex_texture_deref(const nir_tex_instr *instr)
{
   nir_deref_instr *texture_deref_instr = NULL;

   for (unsigned i = 0; i < instr->num_srcs; i++) {
      switch (instr->src[i].src_type) {
      case nir_tex_src_texture_deref:
         texture_deref_instr = nir_src_as_deref(instr->src[i].src);
         break;
      default:
         break;
      }
   }
   return texture_deref_instr;
}

static LLVMValueRef build_tex_intrinsic(struct ac_nir_context *ctx, const nir_tex_instr *instr,
                                        struct ac_image_args *args)
{
   if (instr->sampler_dim == GLSL_SAMPLER_DIM_BUF) {
      unsigned mask = nir_ssa_def_components_read(&instr->dest.ssa);

      assert(instr->dest.is_ssa);
      return ac_build_buffer_load_format(&ctx->ac, args->resource, args->coords[0], ctx->ac.i32_0,
                                         util_last_bit(mask), 0, true,
                                         instr->dest.ssa.bit_size == 16);
   }

   args->opcode = ac_image_sample;

   switch (instr->op) {
   case nir_texop_txf:
   case nir_texop_txf_ms:
   case nir_texop_samples_identical:
      args->opcode = args->level_zero || instr->sampler_dim == GLSL_SAMPLER_DIM_MS
                        ? ac_image_load
                        : ac_image_load_mip;
      args->level_zero = false;
      break;
   case nir_texop_txs:
   case nir_texop_query_levels:
      args->opcode = ac_image_get_resinfo;
      if (!args->lod)
         args->lod = ctx->ac.i32_0;
      args->level_zero = false;
      break;
   case nir_texop_tex:
      if (ctx->stage != MESA_SHADER_FRAGMENT) {
         assert(!args->lod);
         args->level_zero = true;
      }
      break;
   case nir_texop_tg4:
      args->opcode = ac_image_gather4;
      if (!args->lod && !args->bias)
         args->level_zero = true;
      break;
   case nir_texop_lod:
      args->opcode = ac_image_get_lod;
      break;
   case nir_texop_fragment_fetch:
   case nir_texop_fragment_mask_fetch:
      args->opcode = ac_image_load;
      args->level_zero = false;
      break;
   default:
      break;
   }

   if (instr->op == nir_texop_tg4 && ctx->ac.chip_class <= GFX8) {
      nir_deref_instr *texture_deref_instr = get_tex_texture_deref(instr);
      nir_variable *var = nir_deref_instr_get_variable(texture_deref_instr);
      const struct glsl_type *type = glsl_without_array(var->type);
      enum glsl_base_type stype = glsl_get_sampler_result_type(type);
      if (stype == GLSL_TYPE_UINT || stype == GLSL_TYPE_INT) {
         return lower_gather4_integer(&ctx->ac, var, args, instr);
      }
   }

   /* Fixup for GFX9 which allocates 1D textures as 2D. */
   if (instr->op == nir_texop_lod && ctx->ac.chip_class == GFX9) {
      if ((args->dim == ac_image_2darray || args->dim == ac_image_2d) && !args->coords[1]) {
         args->coords[1] = ctx->ac.i32_0;
      }
   }

   args->attributes = AC_FUNC_ATTR_READNONE;
   bool cs_derivs =
      ctx->stage == MESA_SHADER_COMPUTE && ctx->info->cs.derivative_group != DERIVATIVE_GROUP_NONE;
   if (ctx->stage == MESA_SHADER_FRAGMENT || cs_derivs) {
      /* Prevent texture instructions with implicit derivatives from being
       * sinked into branches. */
      switch (instr->op) {
      case nir_texop_tex:
      case nir_texop_txb:
      case nir_texop_lod:
         args->attributes |= AC_FUNC_ATTR_CONVERGENT;
         break;
      default:
         break;
      }
   }

   return ac_build_image_opcode(&ctx->ac, args);
}

static LLVMValueRef visit_vulkan_resource_reindex(struct ac_nir_context *ctx,
                                                  nir_intrinsic_instr *instr)
{
   LLVMValueRef ptr = get_src(ctx, instr->src[0]);
   LLVMValueRef index = get_src(ctx, instr->src[1]);

   LLVMValueRef result = LLVMBuildGEP(ctx->ac.builder, ptr, &index, 1, "");
   LLVMSetMetadata(result, ctx->ac.uniform_md_kind, ctx->ac.empty_md);
   return result;
}

static LLVMValueRef visit_load_push_constant(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   LLVMValueRef ptr, addr;
   LLVMValueRef src0 = get_src(ctx, instr->src[0]);
   unsigned index = nir_intrinsic_base(instr);

   addr = LLVMConstInt(ctx->ac.i32, index, 0);
   addr = LLVMBuildAdd(ctx->ac.builder, addr, src0, "");

   /* Load constant values from user SGPRS when possible, otherwise
    * fallback to the default path that loads directly from memory.
    */
   if (LLVMIsConstant(src0) && instr->dest.ssa.bit_size == 32) {
      unsigned count = instr->dest.ssa.num_components;
      unsigned offset = index;

      offset += LLVMConstIntGetZExtValue(src0);
      offset /= 4;

      offset -= ctx->args->base_inline_push_consts;

      unsigned num_inline_push_consts = ctx->args->num_inline_push_consts;
      if (offset + count <= num_inline_push_consts) {
         LLVMValueRef *const push_constants = alloca(num_inline_push_consts * sizeof(LLVMValueRef));
         for (unsigned i = 0; i < num_inline_push_consts; i++)
            push_constants[i] = ac_get_arg(&ctx->ac, ctx->args->inline_push_consts[i]);
         return ac_build_gather_values(&ctx->ac, push_constants + offset, count);
      }
   }

   ptr =
      LLVMBuildGEP(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->push_constants), &addr, 1, "");

   if (instr->dest.ssa.bit_size == 8) {
      unsigned load_dwords = instr->dest.ssa.num_components > 1 ? 2 : 1;
      LLVMTypeRef vec_type = LLVMVectorType(ctx->ac.i8, 4 * load_dwords);
      ptr = ac_cast_ptr(&ctx->ac, ptr, vec_type);
      LLVMValueRef res = LLVMBuildLoad(ctx->ac.builder, ptr, "");

      LLVMValueRef params[3];
      if (load_dwords > 1) {
         LLVMValueRef res_vec = LLVMBuildBitCast(ctx->ac.builder, res, ctx->ac.v2i32, "");
         params[0] = LLVMBuildExtractElement(ctx->ac.builder, res_vec,
                                             LLVMConstInt(ctx->ac.i32, 1, false), "");
         params[1] = LLVMBuildExtractElement(ctx->ac.builder, res_vec,
                                             LLVMConstInt(ctx->ac.i32, 0, false), "");
      } else {
         res = LLVMBuildBitCast(ctx->ac.builder, res, ctx->ac.i32, "");
         params[0] = ctx->ac.i32_0;
         params[1] = res;
      }
      params[2] = addr;
      res = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.alignbyte", ctx->ac.i32, params, 3, 0);

      res = LLVMBuildTrunc(
         ctx->ac.builder, res,
         LLVMIntTypeInContext(ctx->ac.context, instr->dest.ssa.num_components * 8), "");
      if (instr->dest.ssa.num_components > 1)
         res = LLVMBuildBitCast(ctx->ac.builder, res,
                                LLVMVectorType(ctx->ac.i8, instr->dest.ssa.num_components), "");
      return res;
   } else if (instr->dest.ssa.bit_size == 16) {
      unsigned load_dwords = instr->dest.ssa.num_components / 2 + 1;
      LLVMTypeRef vec_type = LLVMVectorType(ctx->ac.i16, 2 * load_dwords);
      ptr = ac_cast_ptr(&ctx->ac, ptr, vec_type);
      LLVMValueRef res = LLVMBuildLoad(ctx->ac.builder, ptr, "");
      res = LLVMBuildBitCast(ctx->ac.builder, res, vec_type, "");
      LLVMValueRef cond = LLVMBuildLShr(ctx->ac.builder, addr, ctx->ac.i32_1, "");
      cond = LLVMBuildTrunc(ctx->ac.builder, cond, ctx->ac.i1, "");
      LLVMValueRef mask[] = {
         LLVMConstInt(ctx->ac.i32, 0, false), LLVMConstInt(ctx->ac.i32, 1, false),
         LLVMConstInt(ctx->ac.i32, 2, false), LLVMConstInt(ctx->ac.i32, 3, false),
         LLVMConstInt(ctx->ac.i32, 4, false)};
      LLVMValueRef swizzle_aligned = LLVMConstVector(&mask[0], instr->dest.ssa.num_components);
      LLVMValueRef swizzle_unaligned = LLVMConstVector(&mask[1], instr->dest.ssa.num_components);
      LLVMValueRef shuffle_aligned =
         LLVMBuildShuffleVector(ctx->ac.builder, res, res, swizzle_aligned, "");
      LLVMValueRef shuffle_unaligned =
         LLVMBuildShuffleVector(ctx->ac.builder, res, res, swizzle_unaligned, "");
      res = LLVMBuildSelect(ctx->ac.builder, cond, shuffle_unaligned, shuffle_aligned, "");
      return LLVMBuildBitCast(ctx->ac.builder, res, get_def_type(ctx, &instr->dest.ssa), "");
   }

   ptr = ac_cast_ptr(&ctx->ac, ptr, get_def_type(ctx, &instr->dest.ssa));

   return LLVMBuildLoad(ctx->ac.builder, ptr, "");
}

static LLVMValueRef visit_get_ssbo_size(struct ac_nir_context *ctx,
                                        const nir_intrinsic_instr *instr)
{
   LLVMValueRef index = get_src(ctx, instr->src[0]);

   return get_buffer_size(ctx, ctx->abi->load_ssbo(ctx->abi, index, false), false);
}

static LLVMValueRef extract_vector_range(struct ac_llvm_context *ctx, LLVMValueRef src,
                                         unsigned start, unsigned count)
{
   LLVMValueRef mask[] = {ctx->i32_0, ctx->i32_1, LLVMConstInt(ctx->i32, 2, false),
                          LLVMConstInt(ctx->i32, 3, false)};

   unsigned src_elements = ac_get_llvm_num_components(src);

   if (count == src_elements) {
      assert(start == 0);
      return src;
   } else if (count == 1) {
      assert(start < src_elements);
      return LLVMBuildExtractElement(ctx->builder, src, mask[start], "");
   } else {
      assert(start + count <= src_elements);
      assert(count <= 4);
      LLVMValueRef swizzle = LLVMConstVector(&mask[start], count);
      return LLVMBuildShuffleVector(ctx->builder, src, src, swizzle, "");
   }
}

static unsigned get_cache_policy(struct ac_nir_context *ctx, enum gl_access_qualifier access,
                                 bool may_store_unaligned, bool writeonly_memory)
{
   unsigned cache_policy = 0;

   /* GFX6 has a TC L1 bug causing corruption of 8bit/16bit stores.  All
    * store opcodes not aligned to a dword are affected. The only way to
    * get unaligned stores is through shader images.
    */
   if (((may_store_unaligned && ctx->ac.chip_class == GFX6) ||
        /* If this is write-only, don't keep data in L1 to prevent
         * evicting L1 cache lines that may be needed by other
         * instructions.
         */
        writeonly_memory || access & (ACCESS_COHERENT | ACCESS_VOLATILE))) {
      cache_policy |= ac_glc;
   }

   if (access & ACCESS_STREAM_CACHE_POLICY)
      cache_policy |= ac_slc | ac_glc;

   return cache_policy;
}

static LLVMValueRef enter_waterfall_ssbo(struct ac_nir_context *ctx, struct waterfall_context *wctx,
                                         const nir_intrinsic_instr *instr, nir_src src)
{
   return enter_waterfall(ctx, wctx, get_src(ctx, src),
                          nir_intrinsic_access(instr) & ACCESS_NON_UNIFORM);
}

static void visit_store_ssbo(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7000);
   }

   LLVMValueRef src_data = get_src(ctx, instr->src[0]);
   int elem_size_bytes = ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src_data)) / 8;
   unsigned writemask = nir_intrinsic_write_mask(instr);
   enum gl_access_qualifier access = nir_intrinsic_access(instr);
   bool writeonly_memory = access & ACCESS_NON_READABLE;
   unsigned cache_policy = get_cache_policy(ctx, access, false, writeonly_memory);

   struct waterfall_context wctx;
   LLVMValueRef rsrc_base = enter_waterfall_ssbo(ctx, &wctx, instr, instr->src[1]);

   LLVMValueRef rsrc = ctx->abi->load_ssbo(ctx->abi, rsrc_base, true);
   LLVMValueRef base_data = src_data;
   base_data = ac_trim_vector(&ctx->ac, base_data, instr->num_components);
   LLVMValueRef base_offset = get_src(ctx, instr->src[2]);

   while (writemask) {
      int start, count;
      LLVMValueRef data, offset;
      LLVMTypeRef data_type;

      u_bit_scan_consecutive_range(&writemask, &start, &count);

      /* Due to an LLVM limitation with LLVM < 9, split 3-element
       * writes into a 2-element and a 1-element write. */
      if (count == 3 && (elem_size_bytes != 4 || !ac_has_vec3_support(ctx->ac.chip_class, false))) {
         writemask |= 1 << (start + 2);
         count = 2;
      }
      int num_bytes = count * elem_size_bytes; /* count in bytes */

      /* we can only store 4 DWords at the same time.
       * can only happen for 64 Bit vectors. */
      if (num_bytes > 16) {
         writemask |= ((1u << (count - 2)) - 1u) << (start + 2);
         count = 2;
         num_bytes = 16;
      }

      /* check alignment of 16 Bit stores */
      if (elem_size_bytes == 2 && num_bytes > 2 && (start % 2) == 1) {
         writemask |= ((1u << (count - 1)) - 1u) << (start + 1);
         count = 1;
         num_bytes = 2;
      }

      /* Due to alignment issues, split stores of 8-bit/16-bit
       * vectors.
       */
      if (ctx->ac.chip_class == GFX6 && count > 1 && elem_size_bytes < 4) {
         writemask |= ((1u << (count - 1)) - 1u) << (start + 1);
         count = 1;
         num_bytes = elem_size_bytes;
      }

      data = extract_vector_range(&ctx->ac, base_data, start, count);

      offset = LLVMBuildAdd(ctx->ac.builder, base_offset,
                            LLVMConstInt(ctx->ac.i32, start * elem_size_bytes, false), "");

      if (num_bytes == 1) {
         ac_build_tbuffer_store_byte(&ctx->ac, rsrc, data, offset, ctx->ac.i32_0, cache_policy);
      } else if (num_bytes == 2) {
         ac_build_tbuffer_store_short(&ctx->ac, rsrc, data, offset, ctx->ac.i32_0, cache_policy);
      } else {
         int num_channels = num_bytes / 4;

         switch (num_bytes) {
         case 16: /* v4f32 */
            data_type = ctx->ac.v4f32;
            break;
         case 12: /* v3f32 */
            data_type = ctx->ac.v3f32;
            break;
         case 8: /* v2f32 */
            data_type = ctx->ac.v2f32;
            break;
         case 4: /* f32 */
            data_type = ctx->ac.f32;
            break;
         default:
            unreachable("Malformed vector store.");
         }
         data = LLVMBuildBitCast(ctx->ac.builder, data, data_type, "");

         ac_build_buffer_store_dword(&ctx->ac, rsrc, data, num_channels, offset, ctx->ac.i32_0, 0,
                                     cache_policy);
      }
   }

   exit_waterfall(ctx, &wctx, NULL);

   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7000);
}

static LLVMValueRef emit_ssbo_comp_swap_64(struct ac_nir_context *ctx, LLVMValueRef descriptor,
                                           LLVMValueRef offset, LLVMValueRef compare,
                                           LLVMValueRef exchange, bool image)
{
   LLVMBasicBlockRef start_block = NULL, then_block = NULL;
   if (ctx->abi->robust_buffer_access || image) {
      LLVMValueRef size = ac_llvm_extract_elem(&ctx->ac, descriptor, 2);

      LLVMValueRef cond = LLVMBuildICmp(ctx->ac.builder, LLVMIntULT, offset, size, "");
      start_block = LLVMGetInsertBlock(ctx->ac.builder);

      ac_build_ifcc(&ctx->ac, cond, -1);

      then_block = LLVMGetInsertBlock(ctx->ac.builder);
   }

   if (image)
      offset = LLVMBuildMul(ctx->ac.builder, offset, LLVMConstInt(ctx->ac.i32, 8, false), "");

   LLVMValueRef ptr_parts[2] = {
      ac_llvm_extract_elem(&ctx->ac, descriptor, 0),
      LLVMBuildAnd(ctx->ac.builder, ac_llvm_extract_elem(&ctx->ac, descriptor, 1),
                   LLVMConstInt(ctx->ac.i32, 65535, 0), "")};

   ptr_parts[1] = LLVMBuildTrunc(ctx->ac.builder, ptr_parts[1], ctx->ac.i16, "");
   ptr_parts[1] = LLVMBuildSExt(ctx->ac.builder, ptr_parts[1], ctx->ac.i32, "");

   offset = LLVMBuildZExt(ctx->ac.builder, offset, ctx->ac.i64, "");

   LLVMValueRef ptr = ac_build_gather_values(&ctx->ac, ptr_parts, 2);
   ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, ctx->ac.i64, "");
   ptr = LLVMBuildAdd(ctx->ac.builder, ptr, offset, "");
   ptr = LLVMBuildIntToPtr(ctx->ac.builder, ptr, LLVMPointerType(ctx->ac.i64, AC_ADDR_SPACE_GLOBAL),
                           "");

   LLVMValueRef result =
      ac_build_atomic_cmp_xchg(&ctx->ac, ptr, compare, exchange, "singlethread-one-as");
   result = LLVMBuildExtractValue(ctx->ac.builder, result, 0, "");

   if (ctx->abi->robust_buffer_access || image) {
      ac_build_endif(&ctx->ac, -1);

      LLVMBasicBlockRef incoming_blocks[2] = {
         start_block,
         then_block,
      };

      LLVMValueRef incoming_values[2] = {
         LLVMConstInt(ctx->ac.i64, 0, 0),
         result,
      };
      LLVMValueRef ret = LLVMBuildPhi(ctx->ac.builder, ctx->ac.i64, "");
      LLVMAddIncoming(ret, incoming_values, incoming_blocks, 2);
      return ret;
   } else {
      return result;
   }
}

static LLVMValueRef visit_atomic_ssbo(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7001);
   }

   LLVMTypeRef return_type = LLVMTypeOf(get_src(ctx, instr->src[2]));
   const char *op;
   char name[64], type[8];
   LLVMValueRef params[6], descriptor;
   LLVMValueRef result;
   int arg_count = 0;

   struct waterfall_context wctx;
   LLVMValueRef rsrc_base = enter_waterfall_ssbo(ctx, &wctx, instr, instr->src[0]);

   switch (instr->intrinsic) {
   case nir_intrinsic_ssbo_atomic_add:
      op = "add";
      break;
   case nir_intrinsic_ssbo_atomic_imin:
      op = "smin";
      break;
   case nir_intrinsic_ssbo_atomic_umin:
      op = "umin";
      break;
   case nir_intrinsic_ssbo_atomic_imax:
      op = "smax";
      break;
   case nir_intrinsic_ssbo_atomic_umax:
      op = "umax";
      break;
   case nir_intrinsic_ssbo_atomic_and:
      op = "and";
      break;
   case nir_intrinsic_ssbo_atomic_or:
      op = "or";
      break;
   case nir_intrinsic_ssbo_atomic_xor:
      op = "xor";
      break;
   case nir_intrinsic_ssbo_atomic_exchange:
      op = "swap";
      break;
   case nir_intrinsic_ssbo_atomic_comp_swap:
      op = "cmpswap";
      break;
   default:
      abort();
   }

   descriptor = ctx->abi->load_ssbo(ctx->abi, rsrc_base, true);

   if (instr->intrinsic == nir_intrinsic_ssbo_atomic_comp_swap && return_type == ctx->ac.i64) {
      result = emit_ssbo_comp_swap_64(ctx, descriptor, get_src(ctx, instr->src[1]),
                                      get_src(ctx, instr->src[2]), get_src(ctx, instr->src[3]), false);
   } else {
      if (instr->intrinsic == nir_intrinsic_ssbo_atomic_comp_swap) {
         params[arg_count++] = ac_llvm_extract_elem(&ctx->ac, get_src(ctx, instr->src[3]), 0);
      }
      params[arg_count++] = ac_llvm_extract_elem(&ctx->ac, get_src(ctx, instr->src[2]), 0);
      params[arg_count++] = descriptor;

      if (LLVM_VERSION_MAJOR >= 9) {
         /* XXX: The new raw/struct atomic intrinsics are buggy with
          * LLVM 8, see r358579.
          */
         params[arg_count++] = get_src(ctx, instr->src[1]); /* voffset */
         params[arg_count++] = ctx->ac.i32_0;               /* soffset */
         params[arg_count++] = ctx->ac.i32_0;               /* slc */

         ac_build_type_name_for_intr(return_type, type, sizeof(type));
         snprintf(name, sizeof(name), "llvm.amdgcn.raw.buffer.atomic.%s.%s", op, type);
      } else {
         params[arg_count++] = ctx->ac.i32_0;               /* vindex */
         params[arg_count++] = get_src(ctx, instr->src[1]); /* voffset */
         params[arg_count++] = ctx->ac.i1false;             /* slc */

         assert(return_type == ctx->ac.i32);
         snprintf(name, sizeof(name), "llvm.amdgcn.buffer.atomic.%s", op);
      }

      result = ac_build_intrinsic(&ctx->ac, name, return_type, params, arg_count, 0);
   }

   result = exit_waterfall(ctx, &wctx, result);
   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7001);
   return result;
}

static LLVMValueRef visit_load_buffer(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   struct waterfall_context wctx;
   LLVMValueRef rsrc_base = enter_waterfall_ssbo(ctx, &wctx, instr, instr->src[0]);

   int elem_size_bytes = instr->dest.ssa.bit_size / 8;
   int num_components = instr->num_components;
   enum gl_access_qualifier access = nir_intrinsic_access(instr);
   unsigned cache_policy = get_cache_policy(ctx, access, false, false);

   LLVMValueRef offset = get_src(ctx, instr->src[1]);
   LLVMValueRef rsrc = ctx->abi->load_ssbo(ctx->abi, rsrc_base, false);
   LLVMValueRef vindex = ctx->ac.i32_0;

   LLVMTypeRef def_type = get_def_type(ctx, &instr->dest.ssa);
   LLVMTypeRef def_elem_type = num_components > 1 ? LLVMGetElementType(def_type) : def_type;

   LLVMValueRef results[4];
   for (int i = 0; i < num_components;) {
      int num_elems = num_components - i;
      if (elem_size_bytes < 4 && nir_intrinsic_align(instr) % 4 != 0)
         num_elems = 1;
      if (num_elems * elem_size_bytes > 16)
         num_elems = 16 / elem_size_bytes;
      int load_bytes = num_elems * elem_size_bytes;

      LLVMValueRef immoffset = LLVMConstInt(ctx->ac.i32, i * elem_size_bytes, false);

      LLVMValueRef ret;

      if (load_bytes == 1) {
         ret = ac_build_tbuffer_load_byte(&ctx->ac, rsrc, offset, ctx->ac.i32_0, immoffset,
                                          cache_policy);
      } else if (load_bytes == 2) {
         ret = ac_build_tbuffer_load_short(&ctx->ac, rsrc, offset, ctx->ac.i32_0, immoffset,
                                           cache_policy);
      } else {
         int num_channels = util_next_power_of_two(load_bytes) / 4;
         bool can_speculate = access & ACCESS_CAN_REORDER;

         ret = ac_build_buffer_load(&ctx->ac, rsrc, num_channels, vindex, offset, immoffset, 0,
                                    cache_policy, can_speculate, false);
      }

      LLVMTypeRef byte_vec = LLVMVectorType(ctx->ac.i8, ac_get_type_size(LLVMTypeOf(ret)));
      ret = LLVMBuildBitCast(ctx->ac.builder, ret, byte_vec, "");
      ret = ac_trim_vector(&ctx->ac, ret, load_bytes);

      LLVMTypeRef ret_type = LLVMVectorType(def_elem_type, num_elems);
      ret = LLVMBuildBitCast(ctx->ac.builder, ret, ret_type, "");

      for (unsigned j = 0; j < num_elems; j++) {
         results[i + j] =
            LLVMBuildExtractElement(ctx->ac.builder, ret, LLVMConstInt(ctx->ac.i32, j, false), "");
      }
      i += num_elems;
   }

   LLVMValueRef ret = ac_build_gather_values(&ctx->ac, results, num_components);
   return exit_waterfall(ctx, &wctx, ret);
}

static LLVMValueRef enter_waterfall_ubo(struct ac_nir_context *ctx, struct waterfall_context *wctx,
                                        const nir_intrinsic_instr *instr)
{
   return enter_waterfall(ctx, wctx, get_src(ctx, instr->src[0]),
                          nir_intrinsic_access(instr) & ACCESS_NON_UNIFORM);
}

static LLVMValueRef visit_load_global(struct ac_nir_context *ctx,
                                      nir_intrinsic_instr *instr)
{
   LLVMValueRef addr = get_src(ctx, instr->src[0]);
   LLVMTypeRef result_type = get_def_type(ctx, &instr->dest.ssa);
   LLVMValueRef val;

   LLVMTypeRef ptr_type = LLVMPointerType(result_type, AC_ADDR_SPACE_GLOBAL);

   addr = LLVMBuildIntToPtr(ctx->ac.builder, addr, ptr_type, "");

   val = LLVMBuildLoad(ctx->ac.builder, addr, "");

   if (nir_intrinsic_access(instr) & (ACCESS_COHERENT | ACCESS_VOLATILE)) {
      LLVMSetOrdering(val, LLVMAtomicOrderingMonotonic);
      LLVMSetAlignment(val, ac_get_type_size(result_type));
   }

   return val;
}

static void visit_store_global(struct ac_nir_context *ctx,
				     nir_intrinsic_instr *instr)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7002);
   }

   LLVMValueRef data = get_src(ctx, instr->src[0]);
   LLVMValueRef addr = get_src(ctx, instr->src[1]);
   LLVMTypeRef type = LLVMTypeOf(data);
   LLVMValueRef val;

   LLVMTypeRef ptr_type = LLVMPointerType(type, AC_ADDR_SPACE_GLOBAL);

   addr = LLVMBuildIntToPtr(ctx->ac.builder, addr, ptr_type, "");

   val = LLVMBuildStore(ctx->ac.builder, data, addr);

   if (nir_intrinsic_access(instr) & (ACCESS_COHERENT | ACCESS_VOLATILE)) {
      LLVMSetOrdering(val, LLVMAtomicOrderingMonotonic);
      LLVMSetAlignment(val, ac_get_type_size(type));
   }

   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7002);
}

static LLVMValueRef visit_global_atomic(struct ac_nir_context *ctx,
					nir_intrinsic_instr *instr)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7002);
   }

   LLVMValueRef addr = get_src(ctx, instr->src[0]);
   LLVMValueRef data = get_src(ctx, instr->src[1]);
   LLVMAtomicRMWBinOp op;
   LLVMValueRef result;

   /* use "singlethread" sync scope to implement relaxed ordering */
   const char *sync_scope = LLVM_VERSION_MAJOR >= 9 ? "singlethread-one-as" : "singlethread";

   LLVMTypeRef ptr_type = LLVMPointerType(LLVMTypeOf(data), AC_ADDR_SPACE_GLOBAL);

   addr = LLVMBuildIntToPtr(ctx->ac.builder, addr, ptr_type, "");

   if (instr->intrinsic == nir_intrinsic_global_atomic_comp_swap) {
      LLVMValueRef data1 = get_src(ctx, instr->src[2]);
      result = ac_build_atomic_cmp_xchg(&ctx->ac, addr, data, data1, sync_scope);
      result = LLVMBuildExtractValue(ctx->ac.builder, result, 0, "");
   } else {
      switch (instr->intrinsic) {
      case nir_intrinsic_global_atomic_add:
         op = LLVMAtomicRMWBinOpAdd;
         break;
      case nir_intrinsic_global_atomic_umin:
         op = LLVMAtomicRMWBinOpUMin;
         break;
      case nir_intrinsic_global_atomic_umax:
         op = LLVMAtomicRMWBinOpUMax;
         break;
      case nir_intrinsic_global_atomic_imin:
         op = LLVMAtomicRMWBinOpMin;
         break;
      case nir_intrinsic_global_atomic_imax:
         op = LLVMAtomicRMWBinOpMax;
         break;
      case nir_intrinsic_global_atomic_and:
         op = LLVMAtomicRMWBinOpAnd;
         break;
      case nir_intrinsic_global_atomic_or:
         op = LLVMAtomicRMWBinOpOr;
         break;
      case nir_intrinsic_global_atomic_xor:
         op = LLVMAtomicRMWBinOpXor;
         break;
      case nir_intrinsic_global_atomic_exchange:
         op = LLVMAtomicRMWBinOpXchg;
         break;
      default:
         unreachable("Invalid global atomic operation");
      }

      result = ac_build_atomic_rmw(&ctx->ac, op, addr, ac_to_integer(&ctx->ac, data), sync_scope);
   }

   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7002);

   return result;
}

static LLVMValueRef visit_load_ubo_buffer(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   struct waterfall_context wctx;
   LLVMValueRef rsrc_base = enter_waterfall_ubo(ctx, &wctx, instr);

   LLVMValueRef ret;
   LLVMValueRef rsrc = rsrc_base;
   LLVMValueRef offset = get_src(ctx, instr->src[1]);
   int num_components = instr->num_components;
   unsigned desc_set = 0, binding = 0;
   bool valid_binding = false;

   /* Look for vulkan_resource_index to get the desc_set/binding values which
    * are used to determine if it's an inline uniform UBO block.
    */
   if (instr->src[0].ssa->parent_instr->type == nir_instr_type_alu) {
      nir_alu_instr *mov_instr = nir_instr_as_alu(instr->src[0].ssa->parent_instr);
      if (mov_instr->src[0].src.ssa->parent_instr->type == nir_instr_type_intrinsic) {
         nir_intrinsic_instr *idx_instr = nir_instr_as_intrinsic(mov_instr->src[0].src.ssa->parent_instr);
         if (idx_instr->intrinsic == nir_intrinsic_vulkan_resource_index) {
            desc_set = nir_intrinsic_desc_set(idx_instr);
            binding = nir_intrinsic_binding(idx_instr);
            valid_binding = true;
         }
      }
   }

   if (ctx->abi->load_ubo)
      rsrc = ctx->abi->load_ubo(ctx->abi, desc_set, binding, valid_binding, rsrc);

   if (instr->dest.ssa.bit_size == 64)
      num_components *= 2;

   if (instr->dest.ssa.bit_size == 16 || instr->dest.ssa.bit_size == 8) {
      unsigned load_bytes = instr->dest.ssa.bit_size / 8;
      LLVMValueRef *const results = alloca(num_components * sizeof(LLVMValueRef));
      for (unsigned i = 0; i < num_components; ++i) {
         LLVMValueRef immoffset = LLVMConstInt(ctx->ac.i32, load_bytes * i, 0);

         if (load_bytes == 1) {
            results[i] =
               ac_build_tbuffer_load_byte(&ctx->ac, rsrc, offset, ctx->ac.i32_0, immoffset, 0);
         } else {
            assert(load_bytes == 2);
            results[i] =
               ac_build_tbuffer_load_short(&ctx->ac, rsrc, offset, ctx->ac.i32_0, immoffset, 0);
         }
      }
      ret = ac_build_gather_values(&ctx->ac, results, num_components);
   } else {
      ret =
         ac_build_buffer_load(&ctx->ac, rsrc, num_components, NULL, offset, NULL, 0, 0, true, true);

      ret = ac_trim_vector(&ctx->ac, ret, num_components);
   }

   ret = LLVMBuildBitCast(ctx->ac.builder, ret, get_def_type(ctx, &instr->dest.ssa), "");

   return exit_waterfall(ctx, &wctx, ret);
}

static unsigned type_scalar_size_bytes(const struct glsl_type *type)
{
   assert(glsl_type_is_vector_or_scalar(type) || glsl_type_is_matrix(type));
   return glsl_type_is_boolean(type) ? 4 : glsl_get_bit_size(type) / 8;
}

static void visit_store_output(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7002);
   }

   unsigned base = nir_intrinsic_base(instr);
   unsigned writemask = nir_intrinsic_write_mask(instr);
   unsigned component = nir_intrinsic_component(instr);
   LLVMValueRef src = ac_to_float(&ctx->ac, get_src(ctx, instr->src[0]));
   nir_src offset = *nir_get_io_offset_src(instr);
   LLVMValueRef indir_index = NULL;

   if (nir_src_is_const(offset))
      assert(nir_src_as_uint(offset) == 0);
   else
      indir_index = get_src(ctx, offset);

   switch (ac_get_elem_bits(&ctx->ac, LLVMTypeOf(src))) {
   case 16:
   case 32:
      break;
   case 64:
      unreachable("64-bit IO should have been lowered to 32 bits");
      return;
   default:
      unreachable("unhandled store_output bit size");
      return;
   }

   writemask <<= component;

   if (ctx->stage == MESA_SHADER_TESS_CTRL) {
      nir_src *vertex_index_src = nir_get_io_vertex_index_src(instr);
      LLVMValueRef vertex_index = vertex_index_src ? get_src(ctx, *vertex_index_src) : NULL;
      unsigned location = nir_intrinsic_io_semantics(instr).location;

      ctx->abi->store_tcs_outputs(ctx->abi, vertex_index, indir_index, src,
                                  writemask, component, location, base);
      return;
   }

   /* No indirect indexing is allowed after this point. */
   assert(!indir_index);

   for (unsigned chan = 0; chan < 8; chan++) {
      if (!(writemask & (1 << chan)))
         continue;

      LLVMValueRef value = ac_llvm_extract_elem(&ctx->ac, src, chan - component);
      LLVMBuildStore(ctx->ac.builder, value, ctx->abi->outputs[base * 4 + chan]);
   }

   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7002);
}

static int image_type_to_components_count(enum glsl_sampler_dim dim, bool array)
{
   switch (dim) {
   case GLSL_SAMPLER_DIM_BUF:
      return 1;
   case GLSL_SAMPLER_DIM_1D:
      return array ? 2 : 1;
   case GLSL_SAMPLER_DIM_2D:
      return array ? 3 : 2;
   case GLSL_SAMPLER_DIM_MS:
      return array ? 4 : 3;
   case GLSL_SAMPLER_DIM_3D:
   case GLSL_SAMPLER_DIM_CUBE:
      return 3;
   case GLSL_SAMPLER_DIM_RECT:
   case GLSL_SAMPLER_DIM_SUBPASS:
      return 2;
   case GLSL_SAMPLER_DIM_SUBPASS_MS:
      return 3;
   default:
      break;
   }
   return 0;
}

static LLVMValueRef adjust_sample_index_using_fmask(struct ac_llvm_context *ctx,
                                                    LLVMValueRef coord_x, LLVMValueRef coord_y,
                                                    LLVMValueRef coord_z, LLVMValueRef sample_index,
                                                    LLVMValueRef fmask_desc_ptr)
{
   unsigned sample_chan = coord_z ? 3 : 2;
   LLVMValueRef addr[4] = {coord_x, coord_y, coord_z};
   addr[sample_chan] = sample_index;

   ac_apply_fmask_to_sample(ctx, fmask_desc_ptr, addr, coord_z != NULL);
   return addr[sample_chan];
}

static nir_deref_instr *get_image_deref(const nir_intrinsic_instr *instr)
{
   assert(instr->src[0].is_ssa);
   return nir_instr_as_deref(instr->src[0].ssa->parent_instr);
}

static LLVMValueRef get_image_descriptor(struct ac_nir_context *ctx,
                                         const nir_intrinsic_instr *instr,
                                         LLVMValueRef dynamic_index,
                                         enum ac_descriptor_type desc_type, bool write)
{
   nir_deref_instr *deref_instr = instr->src[0].ssa->parent_instr->type == nir_instr_type_deref
                                     ? nir_instr_as_deref(instr->src[0].ssa->parent_instr)
                                     : NULL;

   return get_sampler_desc(ctx, deref_instr, desc_type, &instr->instr, dynamic_index, true, write);
}

static void get_image_coords(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                             LLVMValueRef dynamic_desc_index, struct ac_image_args *args,
                             enum glsl_sampler_dim dim, bool is_array)
{
   LLVMValueRef src0 = get_src(ctx, instr->src[1]);
   LLVMValueRef masks[] = {
      LLVMConstInt(ctx->ac.i32, 0, false),
      LLVMConstInt(ctx->ac.i32, 1, false),
      LLVMConstInt(ctx->ac.i32, 2, false),
      LLVMConstInt(ctx->ac.i32, 3, false),
   };
   LLVMValueRef sample_index = ac_llvm_extract_elem(&ctx->ac, get_src(ctx, instr->src[2]), 0);

   int count;
   ASSERTED bool add_frag_pos =
      (dim == GLSL_SAMPLER_DIM_SUBPASS || dim == GLSL_SAMPLER_DIM_SUBPASS_MS);
   bool is_ms = (dim == GLSL_SAMPLER_DIM_MS || dim == GLSL_SAMPLER_DIM_SUBPASS_MS);
   bool gfx9_1d = ctx->ac.chip_class == GFX9 && dim == GLSL_SAMPLER_DIM_1D;
   assert(!add_frag_pos && "Input attachments should be lowered by this point.");
   count = image_type_to_components_count(dim, is_array);

   if (is_ms && (instr->intrinsic == nir_intrinsic_image_deref_load ||
                 instr->intrinsic == nir_intrinsic_bindless_image_load)) {
      LLVMValueRef fmask_load_address[3];

      fmask_load_address[0] = LLVMBuildExtractElement(ctx->ac.builder, src0, masks[0], "");
      fmask_load_address[1] = LLVMBuildExtractElement(ctx->ac.builder, src0, masks[1], "");
      if (is_array)
         fmask_load_address[2] = LLVMBuildExtractElement(ctx->ac.builder, src0, masks[2], "");
      else
         fmask_load_address[2] = NULL;

      sample_index = adjust_sample_index_using_fmask(
         &ctx->ac, fmask_load_address[0], fmask_load_address[1], fmask_load_address[2],
         sample_index,
         get_sampler_desc(ctx, nir_instr_as_deref(instr->src[0].ssa->parent_instr), AC_DESC_FMASK,
                          &instr->instr, dynamic_desc_index, true, false));
   }
   if (count == 1 && !gfx9_1d) {
      if (instr->src[1].ssa->num_components)
         args->coords[0] = LLVMBuildExtractElement(ctx->ac.builder, src0, masks[0], "");
      else
         args->coords[0] = src0;
   } else {
      int chan;
      if (is_ms)
         count--;
      for (chan = 0; chan < count; ++chan) {
         args->coords[chan] = ac_llvm_extract_elem(&ctx->ac, src0, chan);
      }

      if (gfx9_1d) {
         if (is_array) {
            args->coords[2] = args->coords[1];
            args->coords[1] = ctx->ac.i32_0;
         } else
            args->coords[1] = ctx->ac.i32_0;
         count++;
      }
      if (ctx->ac.chip_class == GFX9 && dim == GLSL_SAMPLER_DIM_2D && !is_array) {
         /* The hw can't bind a slice of a 3D image as a 2D
          * image, because it ignores BASE_ARRAY if the target
          * is 3D. The workaround is to read BASE_ARRAY and set
          * it as the 3rd address operand for all 2D images.
          */
         LLVMValueRef first_layer, const5, mask;

         const5 = LLVMConstInt(ctx->ac.i32, 5, 0);
         mask = LLVMConstInt(ctx->ac.i32, S_008F24_BASE_ARRAY(~0), 0);
         first_layer = LLVMBuildExtractElement(ctx->ac.builder, args->resource, const5, "");
         first_layer = LLVMBuildAnd(ctx->ac.builder, first_layer, mask, "");

         args->coords[count] = first_layer;
         count++;
      }

      if (is_ms) {
         args->coords[count] = sample_index;
         count++;
      }
   }
}

static LLVMValueRef get_image_buffer_descriptor(struct ac_nir_context *ctx,
                                                const nir_intrinsic_instr *instr,
                                                LLVMValueRef dynamic_index, bool write, bool atomic)
{
   LLVMValueRef rsrc = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_BUFFER, write);
   if (ctx->ac.chip_class == GFX9 && LLVM_VERSION_MAJOR < 9 && atomic) {
      LLVMValueRef elem_count =
         LLVMBuildExtractElement(ctx->ac.builder, rsrc, LLVMConstInt(ctx->ac.i32, 2, 0), "");
      LLVMValueRef stride =
         LLVMBuildExtractElement(ctx->ac.builder, rsrc, LLVMConstInt(ctx->ac.i32, 1, 0), "");
      stride = LLVMBuildLShr(ctx->ac.builder, stride, LLVMConstInt(ctx->ac.i32, 16, 0), "");

      LLVMValueRef new_elem_count = LLVMBuildSelect(
         ctx->ac.builder, LLVMBuildICmp(ctx->ac.builder, LLVMIntUGT, elem_count, stride, ""),
         elem_count, stride, "");

      rsrc = LLVMBuildInsertElement(ctx->ac.builder, rsrc, new_elem_count,
                                    LLVMConstInt(ctx->ac.i32, 2, 0), "");
   }
   return rsrc;
}

static LLVMValueRef enter_waterfall_image(struct ac_nir_context *ctx,
                                          struct waterfall_context *wctx,
                                          const nir_intrinsic_instr *instr)
{
   nir_deref_instr *deref_instr = NULL;

   if (instr->src[0].ssa->parent_instr->type == nir_instr_type_deref)
      deref_instr = nir_instr_as_deref(instr->src[0].ssa->parent_instr);

   LLVMValueRef value = get_sampler_desc_index(ctx, deref_instr, &instr->instr, true);
   return enter_waterfall(ctx, wctx, value, nir_intrinsic_access(instr) & ACCESS_NON_UNIFORM);
}

static LLVMValueRef visit_image_load(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                                     bool bindless)
{
   LLVMValueRef res;

   enum glsl_sampler_dim dim;
   enum gl_access_qualifier access = nir_intrinsic_access(instr);
   bool is_array;
   if (bindless) {
      dim = nir_intrinsic_image_dim(instr);
      is_array = nir_intrinsic_image_array(instr);
   } else {
      const nir_deref_instr *image_deref = get_image_deref(instr);
      const struct glsl_type *type = image_deref->type;
      const nir_variable *var = nir_deref_instr_get_variable(image_deref);
      dim = glsl_get_sampler_dim(type);
      access |= var->data.access;
      is_array = glsl_sampler_type_is_array(type);
   }

   struct waterfall_context wctx;
   LLVMValueRef dynamic_index = enter_waterfall_image(ctx, &wctx, instr);

   struct ac_image_args args = {0};

   args.cache_policy = get_cache_policy(ctx, access, false, false);

   if (dim == GLSL_SAMPLER_DIM_BUF) {
      unsigned num_channels = util_last_bit(nir_ssa_def_components_read(&instr->dest.ssa));
      if (instr->dest.ssa.bit_size == 64)
         num_channels = num_channels < 4 ? 2 : 4;
      LLVMValueRef rsrc, vindex;

      rsrc = get_image_buffer_descriptor(ctx, instr, dynamic_index, false, false);
      vindex =
         LLVMBuildExtractElement(ctx->ac.builder, get_src(ctx, instr->src[1]), ctx->ac.i32_0, "");

      assert(instr->dest.is_ssa);
      bool can_speculate = access & ACCESS_CAN_REORDER;
      res = ac_build_buffer_load_format(&ctx->ac, rsrc, vindex, ctx->ac.i32_0, num_channels,
                                        args.cache_policy, can_speculate,
                                        instr->dest.ssa.bit_size == 16);
      res = ac_build_expand_to_vec4(&ctx->ac, res, num_channels);

      res = ac_trim_vector(&ctx->ac, res, instr->dest.ssa.num_components);
      res = ac_to_integer(&ctx->ac, res);
   } else {
      bool level_zero = nir_src_is_const(instr->src[3]) && nir_src_as_uint(instr->src[3]) == 0;

      args.opcode = level_zero ? ac_image_load : ac_image_load_mip;
      args.resource = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_IMAGE, false);
      get_image_coords(ctx, instr, dynamic_index, &args, dim, is_array);
      args.dim = ac_get_image_dim(ctx->ac.chip_class, dim, is_array);
      if (!level_zero)
         args.lod = get_src(ctx, instr->src[3]);
      args.dmask = 15;
      args.attributes = AC_FUNC_ATTR_READONLY;

      assert(instr->dest.is_ssa);
      args.d16 = instr->dest.ssa.bit_size == 16;

      res = ac_build_image_opcode(&ctx->ac, &args);
   }

   if (instr->dest.ssa.bit_size == 64) {
      res = LLVMBuildBitCast(ctx->ac.builder, res, LLVMVectorType(ctx->ac.i64, 2), "");
      LLVMValueRef x = LLVMBuildExtractElement(ctx->ac.builder, res, ctx->ac.i32_0, "");
      LLVMValueRef w = LLVMBuildExtractElement(ctx->ac.builder, res, ctx->ac.i32_1, "");

      LLVMValueRef values[4] = {x, ctx->ac.i64_0, ctx->ac.i64_0, w};
      res = ac_build_gather_values(&ctx->ac, values, 4);
   }

   return exit_waterfall(ctx, &wctx, res);
}

static void visit_image_store(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                              bool bindless)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7003);
   }

   enum glsl_sampler_dim dim;
   enum gl_access_qualifier access = nir_intrinsic_access(instr);
   bool is_array;

   if (bindless) {
      dim = nir_intrinsic_image_dim(instr);
      is_array = nir_intrinsic_image_array(instr);
   } else {
      const nir_deref_instr *image_deref = get_image_deref(instr);
      const struct glsl_type *type = image_deref->type;
      const nir_variable *var = nir_deref_instr_get_variable(image_deref);
      dim = glsl_get_sampler_dim(type);
      access |= var->data.access;
      is_array = glsl_sampler_type_is_array(type);
   }

   struct waterfall_context wctx;
   LLVMValueRef dynamic_index = enter_waterfall_image(ctx, &wctx, instr);

   bool writeonly_memory = access & ACCESS_NON_READABLE;
   struct ac_image_args args = {0};

   args.cache_policy = get_cache_policy(ctx, access, true, writeonly_memory);

   LLVMValueRef src = get_src(ctx, instr->src[3]);
   if (instr->src[3].ssa->bit_size == 64) {
      /* only R64_UINT and R64_SINT supported */
      src = ac_llvm_extract_elem(&ctx->ac, src, 0);
      src = LLVMBuildBitCast(ctx->ac.builder, src, ctx->ac.v2f32, "");
   } else {
      src = ac_to_float(&ctx->ac, src);
   }

   if (dim == GLSL_SAMPLER_DIM_BUF) {
      LLVMValueRef rsrc = get_image_buffer_descriptor(ctx, instr, dynamic_index, true, false);
      unsigned src_channels = ac_get_llvm_num_components(src);
      LLVMValueRef vindex;

      if (src_channels == 3)
         src = ac_build_expand_to_vec4(&ctx->ac, src, 3);

      vindex =
         LLVMBuildExtractElement(ctx->ac.builder, get_src(ctx, instr->src[1]), ctx->ac.i32_0, "");

      ac_build_buffer_store_format(&ctx->ac, rsrc, src, vindex, ctx->ac.i32_0, args.cache_policy);
   } else {
      bool level_zero = nir_src_is_const(instr->src[4]) && nir_src_as_uint(instr->src[4]) == 0;

      args.opcode = level_zero ? ac_image_store : ac_image_store_mip;
      args.data[0] = src;
      args.resource = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_IMAGE, true);
      get_image_coords(ctx, instr, dynamic_index, &args, dim, is_array);
      args.dim = ac_get_image_dim(ctx->ac.chip_class, dim, is_array);
      if (!level_zero)
         args.lod = get_src(ctx, instr->src[4]);
      args.dmask = 15;
      args.d16 = ac_get_elem_bits(&ctx->ac, LLVMTypeOf(args.data[0])) == 16;

      ac_build_image_opcode(&ctx->ac, &args);
   }

   exit_waterfall(ctx, &wctx, NULL);
   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7003);
}

static LLVMValueRef visit_image_atomic(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                                       bool bindless)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7004);
   }

   LLVMValueRef params[7];
   int param_count = 0;

   bool cmpswap = instr->intrinsic == nir_intrinsic_image_deref_atomic_comp_swap ||
                  instr->intrinsic == nir_intrinsic_bindless_image_atomic_comp_swap;
   const char *atomic_name;
   char intrinsic_name[64];
   enum ac_atomic_op atomic_subop;
   ASSERTED int length;

   enum glsl_sampler_dim dim;
   bool is_array;
   if (bindless) {
      dim = nir_intrinsic_image_dim(instr);
      is_array = nir_intrinsic_image_array(instr);
   } else {
      const struct glsl_type *type = get_image_deref(instr)->type;
      dim = glsl_get_sampler_dim(type);
      is_array = glsl_sampler_type_is_array(type);
   }

   struct waterfall_context wctx;
   LLVMValueRef dynamic_index = enter_waterfall_image(ctx, &wctx, instr);

   switch (instr->intrinsic) {
   case nir_intrinsic_bindless_image_atomic_add:
   case nir_intrinsic_image_deref_atomic_add:
      atomic_name = "add";
      atomic_subop = ac_atomic_add;
      break;
   case nir_intrinsic_bindless_image_atomic_imin:
   case nir_intrinsic_image_deref_atomic_imin:
      atomic_name = "smin";
      atomic_subop = ac_atomic_smin;
      break;
   case nir_intrinsic_bindless_image_atomic_umin:
   case nir_intrinsic_image_deref_atomic_umin:
      atomic_name = "umin";
      atomic_subop = ac_atomic_umin;
      break;
   case nir_intrinsic_bindless_image_atomic_imax:
   case nir_intrinsic_image_deref_atomic_imax:
      atomic_name = "smax";
      atomic_subop = ac_atomic_smax;
      break;
   case nir_intrinsic_bindless_image_atomic_umax:
   case nir_intrinsic_image_deref_atomic_umax:
      atomic_name = "umax";
      atomic_subop = ac_atomic_umax;
      break;
   case nir_intrinsic_bindless_image_atomic_and:
   case nir_intrinsic_image_deref_atomic_and:
      atomic_name = "and";
      atomic_subop = ac_atomic_and;
      break;
   case nir_intrinsic_bindless_image_atomic_or:
   case nir_intrinsic_image_deref_atomic_or:
      atomic_name = "or";
      atomic_subop = ac_atomic_or;
      break;
   case nir_intrinsic_bindless_image_atomic_xor:
   case nir_intrinsic_image_deref_atomic_xor:
      atomic_name = "xor";
      atomic_subop = ac_atomic_xor;
      break;
   case nir_intrinsic_bindless_image_atomic_exchange:
   case nir_intrinsic_image_deref_atomic_exchange:
      atomic_name = "swap";
      atomic_subop = ac_atomic_swap;
      break;
   case nir_intrinsic_bindless_image_atomic_comp_swap:
   case nir_intrinsic_image_deref_atomic_comp_swap:
      atomic_name = "cmpswap";
      atomic_subop = 0; /* not used */
      break;
   case nir_intrinsic_bindless_image_atomic_inc_wrap:
   case nir_intrinsic_image_deref_atomic_inc_wrap: {
      atomic_name = "inc";
      atomic_subop = ac_atomic_inc_wrap;
      break;
   }
   case nir_intrinsic_bindless_image_atomic_dec_wrap:
   case nir_intrinsic_image_deref_atomic_dec_wrap:
      atomic_name = "dec";
      atomic_subop = ac_atomic_dec_wrap;
      break;
   default:
      abort();
   }

   if (cmpswap)
      params[param_count++] = get_src(ctx, instr->src[4]);
   params[param_count++] = get_src(ctx, instr->src[3]);

   LLVMValueRef result;
   if (dim == GLSL_SAMPLER_DIM_BUF) {
      params[param_count++] = get_image_buffer_descriptor(ctx, instr, dynamic_index, true, true);
      params[param_count++] = LLVMBuildExtractElement(ctx->ac.builder, get_src(ctx, instr->src[1]),
                                                      ctx->ac.i32_0, ""); /* vindex */
      params[param_count++] = ctx->ac.i32_0;                              /* voffset */
      if (cmpswap && instr->dest.ssa.bit_size == 64) {
         result = emit_ssbo_comp_swap_64(ctx, params[2], params[3], params[1], params[0], true);
      } else {
         if (LLVM_VERSION_MAJOR >= 9) {
            /* XXX: The new raw/struct atomic intrinsics are buggy
             * with LLVM 8, see r358579.
             */
            params[param_count++] = ctx->ac.i32_0; /* soffset */
            params[param_count++] = ctx->ac.i32_0; /* slc */

            length = snprintf(intrinsic_name, sizeof(intrinsic_name),
                              "llvm.amdgcn.struct.buffer.atomic.%s.%s", atomic_name,
                              instr->dest.ssa.bit_size == 64 ? "i64" : "i32");
         } else {
            assert(instr->dest.ssa.bit_size == 64);
            params[param_count++] = ctx->ac.i1false; /* slc */

            length = snprintf(intrinsic_name, sizeof(intrinsic_name), "llvm.amdgcn.buffer.atomic.%s",
                              atomic_name);
         }

         assert(length < sizeof(intrinsic_name));
         result = ac_build_intrinsic(&ctx->ac, intrinsic_name, LLVMTypeOf(params[0]), params, param_count, 0);
      }
   } else {
      struct ac_image_args args = {0};
      args.opcode = cmpswap ? ac_image_atomic_cmpswap : ac_image_atomic;
      args.atomic = atomic_subop;
      args.data[0] = params[0];
      if (cmpswap)
         args.data[1] = params[1];
      args.resource = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_IMAGE, true);
      get_image_coords(ctx, instr, dynamic_index, &args, dim, is_array);
      args.dim = ac_get_image_dim(ctx->ac.chip_class, dim, is_array);

      result = ac_build_image_opcode(&ctx->ac, &args);
   }

   result = exit_waterfall(ctx, &wctx, result);
   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7004);
   return result;
}

static LLVMValueRef visit_image_samples(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   struct waterfall_context wctx;
   LLVMValueRef dynamic_index = enter_waterfall_image(ctx, &wctx, instr);
   LLVMValueRef rsrc = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_IMAGE, false);

   LLVMValueRef ret = ac_build_image_get_sample_count(&ctx->ac, rsrc);

   return exit_waterfall(ctx, &wctx, ret);
}

static LLVMValueRef visit_image_size(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                                     bool bindless)
{
   LLVMValueRef res;

   enum glsl_sampler_dim dim;
   bool is_array;
   if (bindless) {
      dim = nir_intrinsic_image_dim(instr);
      is_array = nir_intrinsic_image_array(instr);
   } else {
      const struct glsl_type *type = get_image_deref(instr)->type;
      dim = glsl_get_sampler_dim(type);
      is_array = glsl_sampler_type_is_array(type);
   }

   struct waterfall_context wctx;
   LLVMValueRef dynamic_index = enter_waterfall_image(ctx, &wctx, instr);

   if (dim == GLSL_SAMPLER_DIM_BUF) {
      res = get_buffer_size(
         ctx, get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_BUFFER, false), true);
   } else {

      struct ac_image_args args = {0};

      args.dim = ac_get_image_dim(ctx->ac.chip_class, dim, is_array);
      args.dmask = 0xf;
      args.resource = get_image_descriptor(ctx, instr, dynamic_index, AC_DESC_IMAGE, false);
      args.opcode = ac_image_get_resinfo;
      assert(nir_src_as_uint(instr->src[1]) == 0);
      args.lod = ctx->ac.i32_0;
      args.attributes = AC_FUNC_ATTR_READNONE;

      res = ac_build_image_opcode(&ctx->ac, &args);

      LLVMValueRef two = LLVMConstInt(ctx->ac.i32, 2, false);

      if (dim == GLSL_SAMPLER_DIM_CUBE && is_array) {
         LLVMValueRef six = LLVMConstInt(ctx->ac.i32, 6, false);
         LLVMValueRef z = LLVMBuildExtractElement(ctx->ac.builder, res, two, "");
         z = LLVMBuildSDiv(ctx->ac.builder, z, six, "");
         res = LLVMBuildInsertElement(ctx->ac.builder, res, z, two, "");
      }

      if (ctx->ac.chip_class == GFX9 && dim == GLSL_SAMPLER_DIM_1D && is_array) {
         LLVMValueRef layers = LLVMBuildExtractElement(ctx->ac.builder, res, two, "");
         res = LLVMBuildInsertElement(ctx->ac.builder, res, layers, ctx->ac.i32_1, "");
      }
   }
   return exit_waterfall(ctx, &wctx, res);
}

static void emit_membar(struct ac_llvm_context *ac, const nir_intrinsic_instr *instr)
{
   unsigned wait_flags = 0;

   switch (instr->intrinsic) {
   case nir_intrinsic_memory_barrier:
   case nir_intrinsic_group_memory_barrier:
      wait_flags = AC_WAIT_LGKM | AC_WAIT_VLOAD | AC_WAIT_VSTORE;
      break;
   case nir_intrinsic_memory_barrier_buffer:
   case nir_intrinsic_memory_barrier_image:
      wait_flags = AC_WAIT_VLOAD | AC_WAIT_VSTORE;
      break;
   case nir_intrinsic_memory_barrier_shared:
      wait_flags = AC_WAIT_LGKM;
      break;
   default:
      break;
   }

   ac_build_waitcnt(ac, wait_flags);
}

void ac_emit_barrier(struct ac_llvm_context *ac, gl_shader_stage stage)
{
   /* GFX6 only (thanks to a hw bug workaround):
    * The real barrier instruction isn’t needed, because an entire patch
    * always fits into a single wave.
    */
   if (ac->chip_class == GFX6 && stage == MESA_SHADER_TESS_CTRL) {
      ac_build_waitcnt(ac, AC_WAIT_LGKM | AC_WAIT_VLOAD | AC_WAIT_VSTORE);
      return;
   }
   ac_build_s_barrier(ac);
}

static void emit_discard(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr)
{
   LLVMValueRef cond;

   if (instr->intrinsic == nir_intrinsic_discard_if ||
       instr->intrinsic == nir_intrinsic_terminate_if) {
      cond = LLVMBuildNot(ctx->ac.builder, get_src(ctx, instr->src[0]), "");
   } else {
      assert(instr->intrinsic == nir_intrinsic_discard);
      cond = ctx->ac.i1false;
   }

   ac_build_kill_if_false(&ctx->ac, cond);
}

static void emit_demote(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr)
{
   LLVMValueRef cond;

   if (instr->intrinsic == nir_intrinsic_demote_if) {
      cond = LLVMBuildNot(ctx->ac.builder, get_src(ctx, instr->src[0]), "");
   } else {
      assert(instr->intrinsic == nir_intrinsic_demote);
      cond = ctx->ac.i1false;
   }

   /* Kill immediately while maintaining WQM. */
   ac_build_kill_if_false(&ctx->ac, ac_build_wqm_vote(&ctx->ac, cond));

   LLVMValueRef mask = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
   mask = LLVMBuildAnd(ctx->ac.builder, mask, cond, "");
   LLVMBuildStore(ctx->ac.builder, mask, ctx->ac.postponed_kill);
   return;
}

static LLVMValueRef visit_load_local_invocation_index(struct ac_nir_context *ctx)
{
   LLVMValueRef result;
   LLVMValueRef thread_id = ac_get_thread_id(&ctx->ac);
   result = LLVMBuildAnd(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->tg_size),
                         LLVMConstInt(ctx->ac.i32, 0xfc0, false), "");

   if (ctx->ac.wave_size == 32)
      result = LLVMBuildLShr(ctx->ac.builder, result, LLVMConstInt(ctx->ac.i32, 1, false), "");

   return LLVMBuildAdd(ctx->ac.builder, result, thread_id, "");
}

static LLVMValueRef visit_load_subgroup_id(struct ac_nir_context *ctx)
{
   if (ctx->stage == MESA_SHADER_COMPUTE) {
      LLVMValueRef result;
      result = LLVMBuildAnd(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->tg_size),
                            LLVMConstInt(ctx->ac.i32, 0xfc0, false), "");
      return LLVMBuildLShr(ctx->ac.builder, result, LLVMConstInt(ctx->ac.i32, 6, false), "");
   } else {
      return LLVMConstInt(ctx->ac.i32, 0, false);
   }
}

static LLVMValueRef visit_load_num_subgroups(struct ac_nir_context *ctx)
{
   if (ctx->stage == MESA_SHADER_COMPUTE) {
      return LLVMBuildAnd(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->tg_size),
                          LLVMConstInt(ctx->ac.i32, 0x3f, false), "");
   } else {
      return LLVMConstInt(ctx->ac.i32, 1, false);
   }
}

static LLVMValueRef visit_first_invocation(struct ac_nir_context *ctx)
{
   LLVMValueRef active_set = ac_build_ballot(&ctx->ac, ctx->ac.i32_1);
   const char *intr = ctx->ac.wave_size == 32 ? "llvm.cttz.i32" : "llvm.cttz.i64";

   /* The second argument is whether cttz(0) should be defined, but we do not care. */
   LLVMValueRef args[] = {active_set, ctx->ac.i1false};
   LLVMValueRef result = ac_build_intrinsic(&ctx->ac, intr, ctx->ac.iN_wavemask, args, 2,
                                            AC_FUNC_ATTR_NOUNWIND | AC_FUNC_ATTR_READNONE);

   return LLVMBuildTrunc(ctx->ac.builder, result, ctx->ac.i32, "");
}

static LLVMValueRef visit_load_shared(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr)
{
   LLVMValueRef values[4], derived_ptr, index, ret;

   LLVMValueRef ptr = get_memory_ptr(ctx, instr->src[0], instr->dest.ssa.bit_size);

   for (int chan = 0; chan < instr->num_components; chan++) {
      index = LLVMConstInt(ctx->ac.i32, chan, 0);
      derived_ptr = LLVMBuildGEP(ctx->ac.builder, ptr, &index, 1, "");
      values[chan] = LLVMBuildLoad(ctx->ac.builder, derived_ptr, "");
   }

   ret = ac_build_gather_values(&ctx->ac, values, instr->num_components);
   return LLVMBuildBitCast(ctx->ac.builder, ret, get_def_type(ctx, &instr->dest.ssa), "");
}

static void visit_store_shared(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr)
{
   LLVMValueRef derived_ptr, data, index;
   LLVMBuilderRef builder = ctx->ac.builder;

   LLVMValueRef ptr = get_memory_ptr(ctx, instr->src[1], instr->src[0].ssa->bit_size);
   LLVMValueRef src = get_src(ctx, instr->src[0]);

   int writemask = nir_intrinsic_write_mask(instr);
   for (int chan = 0; chan < 4; chan++) {
      if (!(writemask & (1 << chan))) {
         continue;
      }
      data = ac_llvm_extract_elem(&ctx->ac, src, chan);
      index = LLVMConstInt(ctx->ac.i32, chan, 0);
      derived_ptr = LLVMBuildGEP(builder, ptr, &index, 1, "");
      LLVMBuildStore(builder, data, derived_ptr);
   }
}

static LLVMValueRef visit_var_atomic(struct ac_nir_context *ctx, const nir_intrinsic_instr *instr,
                                     LLVMValueRef ptr, int src_idx)
{
   if (ctx->ac.postponed_kill) {
      LLVMValueRef cond = LLVMBuildLoad(ctx->ac.builder, ctx->ac.postponed_kill, "");
      ac_build_ifcc(&ctx->ac, cond, 7005);
   }

   LLVMValueRef result;
   LLVMValueRef src = get_src(ctx, instr->src[src_idx]);

   const char *sync_scope = LLVM_VERSION_MAJOR >= 9 ? "workgroup-one-as" : "workgroup";

   if (instr->intrinsic == nir_intrinsic_shared_atomic_comp_swap) {
      LLVMValueRef src1 = get_src(ctx, instr->src[src_idx + 1]);
      result = ac_build_atomic_cmp_xchg(&ctx->ac, ptr, src, src1, sync_scope);
      result = LLVMBuildExtractValue(ctx->ac.builder, result, 0, "");
   } else {
      LLVMAtomicRMWBinOp op;
      switch (instr->intrinsic) {
      case nir_intrinsic_shared_atomic_add:
         op = LLVMAtomicRMWBinOpAdd;
         break;
      case nir_intrinsic_shared_atomic_umin:
         op = LLVMAtomicRMWBinOpUMin;
         break;
      case nir_intrinsic_shared_atomic_umax:
         op = LLVMAtomicRMWBinOpUMax;
         break;
      case nir_intrinsic_shared_atomic_imin:
         op = LLVMAtomicRMWBinOpMin;
         break;
      case nir_intrinsic_shared_atomic_imax:
         op = LLVMAtomicRMWBinOpMax;
         break;
      case nir_intrinsic_shared_atomic_and:
         op = LLVMAtomicRMWBinOpAnd;
         break;
      case nir_intrinsic_shared_atomic_or:
         op = LLVMAtomicRMWBinOpOr;
         break;
      case nir_intrinsic_shared_atomic_xor:
         op = LLVMAtomicRMWBinOpXor;
         break;
      case nir_intrinsic_shared_atomic_exchange:
         op = LLVMAtomicRMWBinOpXchg;
         break;
#if LLVM_VERSION_MAJOR >= 10
      case nir_intrinsic_shared_atomic_fadd:
         op = LLVMAtomicRMWBinOpFAdd;
         break;
#endif
      default:
         return NULL;
      }

      LLVMValueRef val;

      if (instr->intrinsic == nir_intrinsic_shared_atomic_fadd) {
         val = ac_to_float(&ctx->ac, src);

         LLVMTypeRef ptr_type =
            LLVMPointerType(LLVMTypeOf(val), LLVMGetPointerAddressSpace(LLVMTypeOf(ptr)));
         ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, ptr_type, "");
      } else {
         val = ac_to_integer(&ctx->ac, src);
      }

      result = ac_build_atomic_rmw(&ctx->ac, op, ptr, val, sync_scope);

      if (instr->intrinsic == nir_intrinsic_shared_atomic_fadd ||
          instr->intrinsic == nir_intrinsic_deref_atomic_fadd) {
         result = ac_to_integer(&ctx->ac, result);
      }
   }

   if (ctx->ac.postponed_kill)
      ac_build_endif(&ctx->ac, 7005);
   return result;
}

static LLVMValueRef load_sample_pos(struct ac_nir_context *ctx)
{
   LLVMValueRef values[2];
   LLVMValueRef pos[2];

   pos[0] = ac_to_float(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->frag_pos[0]));
   pos[1] = ac_to_float(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->frag_pos[1]));

   values[0] = ac_build_fract(&ctx->ac, pos[0], 32);
   values[1] = ac_build_fract(&ctx->ac, pos[1], 32);
   return ac_build_gather_values(&ctx->ac, values, 2);
}

static LLVMValueRef lookup_interp_param(struct ac_nir_context *ctx, enum glsl_interp_mode interp,
                                        unsigned location)
{
   switch (interp) {
   case INTERP_MODE_FLAT:
   default:
      return NULL;
   case INTERP_MODE_SMOOTH:
   case INTERP_MODE_NONE:
      if (location == INTERP_CENTER)
         return ac_get_arg(&ctx->ac, ctx->args->persp_center);
      else if (location == INTERP_CENTROID)
         return ctx->abi->persp_centroid;
      else if (location == INTERP_SAMPLE)
         return ac_get_arg(&ctx->ac, ctx->args->persp_sample);
      break;
   case INTERP_MODE_NOPERSPECTIVE:
      if (location == INTERP_CENTER)
         return ac_get_arg(&ctx->ac, ctx->args->linear_center);
      else if (location == INTERP_CENTROID)
         return ctx->abi->linear_centroid;
      else if (location == INTERP_SAMPLE)
         return ac_get_arg(&ctx->ac, ctx->args->linear_sample);
      break;
   }
   return NULL;
}

static LLVMValueRef barycentric_center(struct ac_nir_context *ctx, unsigned mode)
{
   LLVMValueRef interp_param = lookup_interp_param(ctx, mode, INTERP_CENTER);
   return LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2i32, "");
}

static LLVMValueRef barycentric_offset(struct ac_nir_context *ctx, unsigned mode,
                                       LLVMValueRef offset)
{
   LLVMValueRef interp_param = lookup_interp_param(ctx, mode, INTERP_CENTER);
   LLVMValueRef src_c0 =
      ac_to_float(&ctx->ac, LLVMBuildExtractElement(ctx->ac.builder, offset, ctx->ac.i32_0, ""));
   LLVMValueRef src_c1 =
      ac_to_float(&ctx->ac, LLVMBuildExtractElement(ctx->ac.builder, offset, ctx->ac.i32_1, ""));

   LLVMValueRef ij_out[2];
   LLVMValueRef ddxy_out = ac_build_ddxy_interp(&ctx->ac, interp_param);

   /*
    * take the I then J parameters, and the DDX/Y for it, and
    * calculate the IJ inputs for the interpolator.
    * temp1 = ddx * offset/sample.x + I;
    * interp_param.I = ddy * offset/sample.y + temp1;
    * temp1 = ddx * offset/sample.x + J;
    * interp_param.J = ddy * offset/sample.y + temp1;
    */
   for (unsigned i = 0; i < 2; i++) {
      LLVMValueRef ix_ll = LLVMConstInt(ctx->ac.i32, i, false);
      LLVMValueRef iy_ll = LLVMConstInt(ctx->ac.i32, i + 2, false);
      LLVMValueRef ddx_el = LLVMBuildExtractElement(ctx->ac.builder, ddxy_out, ix_ll, "");
      LLVMValueRef ddy_el = LLVMBuildExtractElement(ctx->ac.builder, ddxy_out, iy_ll, "");
      LLVMValueRef interp_el = LLVMBuildExtractElement(ctx->ac.builder, interp_param, ix_ll, "");
      LLVMValueRef temp1, temp2;

      interp_el = LLVMBuildBitCast(ctx->ac.builder, interp_el, ctx->ac.f32, "");

      temp1 = ac_build_fmad(&ctx->ac, ddx_el, src_c0, interp_el);
      temp2 = ac_build_fmad(&ctx->ac, ddy_el, src_c1, temp1);

      ij_out[i] = LLVMBuildBitCast(ctx->ac.builder, temp2, ctx->ac.i32, "");
   }
   interp_param = ac_build_gather_values(&ctx->ac, ij_out, 2);
   return LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2i32, "");
}

static LLVMValueRef barycentric_centroid(struct ac_nir_context *ctx, unsigned mode)
{
   LLVMValueRef interp_param = lookup_interp_param(ctx, mode, INTERP_CENTROID);
   return LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2i32, "");
}

static LLVMValueRef barycentric_at_sample(struct ac_nir_context *ctx, unsigned mode,
                                          LLVMValueRef sample_id)
{
   if (ctx->abi->interp_at_sample_force_center)
      return barycentric_center(ctx, mode);

   LLVMValueRef halfval = LLVMConstReal(ctx->ac.f32, 0.5f);

   /* fetch sample ID */
   LLVMValueRef sample_pos = ctx->abi->load_sample_position(ctx->abi, sample_id);

   LLVMValueRef src_c0 = LLVMBuildExtractElement(ctx->ac.builder, sample_pos, ctx->ac.i32_0, "");
   src_c0 = LLVMBuildFSub(ctx->ac.builder, src_c0, halfval, "");
   LLVMValueRef src_c1 = LLVMBuildExtractElement(ctx->ac.builder, sample_pos, ctx->ac.i32_1, "");
   src_c1 = LLVMBuildFSub(ctx->ac.builder, src_c1, halfval, "");
   LLVMValueRef coords[] = {src_c0, src_c1};
   LLVMValueRef offset = ac_build_gather_values(&ctx->ac, coords, 2);

   return barycentric_offset(ctx, mode, offset);
}

static LLVMValueRef barycentric_sample(struct ac_nir_context *ctx, unsigned mode)
{
   LLVMValueRef interp_param = lookup_interp_param(ctx, mode, INTERP_SAMPLE);
   return LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2i32, "");
}

static LLVMValueRef barycentric_model(struct ac_nir_context *ctx)
{
   return LLVMBuildBitCast(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->pull_model),
                           ctx->ac.v3i32, "");
}

static LLVMValueRef load_interpolated_input(struct ac_nir_context *ctx, LLVMValueRef interp_param,
                                            unsigned index, unsigned comp_start,
                                            unsigned num_components, unsigned bitsize)
{
   LLVMValueRef attr_number = LLVMConstInt(ctx->ac.i32, index, false);
   LLVMValueRef interp_param_f;

   interp_param_f = LLVMBuildBitCast(ctx->ac.builder, interp_param, ctx->ac.v2f32, "");
   LLVMValueRef i = LLVMBuildExtractElement(ctx->ac.builder, interp_param_f, ctx->ac.i32_0, "");
   LLVMValueRef j = LLVMBuildExtractElement(ctx->ac.builder, interp_param_f, ctx->ac.i32_1, "");

   /* Workaround for issue 2647: kill threads with infinite interpolation coeffs */
   if (ctx->verified_interp && !_mesa_hash_table_search(ctx->verified_interp, interp_param)) {
      LLVMValueRef args[2];
      args[0] = i;
      args[1] = LLVMConstInt(ctx->ac.i32, S_NAN | Q_NAN | N_INFINITY | P_INFINITY, false);
      LLVMValueRef cond = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.class.f32", ctx->ac.i1, args, 2,
                                             AC_FUNC_ATTR_READNONE);
      ac_build_kill_if_false(&ctx->ac, LLVMBuildNot(ctx->ac.builder, cond, ""));
      _mesa_hash_table_insert(ctx->verified_interp, interp_param, interp_param);
   }

   LLVMValueRef values[4];
   assert(bitsize == 16 || bitsize == 32);
   for (unsigned comp = 0; comp < num_components; comp++) {
      LLVMValueRef llvm_chan = LLVMConstInt(ctx->ac.i32, comp_start + comp, false);
      if (bitsize == 16) {
         values[comp] = ac_build_fs_interp_f16(&ctx->ac, llvm_chan, attr_number,
                                               ac_get_arg(&ctx->ac, ctx->args->prim_mask), i, j);
      } else {
         values[comp] = ac_build_fs_interp(&ctx->ac, llvm_chan, attr_number,
                                           ac_get_arg(&ctx->ac, ctx->args->prim_mask), i, j);
      }
   }

   return ac_to_integer(&ctx->ac, ac_build_gather_values(&ctx->ac, values, num_components));
}

static LLVMValueRef visit_load(struct ac_nir_context *ctx, nir_intrinsic_instr *instr,
                               bool is_output)
{
   LLVMValueRef values[8];
   LLVMTypeRef dest_type = get_def_type(ctx, &instr->dest.ssa);
   LLVMTypeRef component_type;
   unsigned base = nir_intrinsic_base(instr);
   unsigned component = nir_intrinsic_component(instr);
   unsigned count = instr->dest.ssa.num_components;
   nir_src *vertex_index_src = nir_get_io_vertex_index_src(instr);
   LLVMValueRef vertex_index = vertex_index_src ? get_src(ctx, *vertex_index_src) : NULL;
   nir_src offset = *nir_get_io_offset_src(instr);
   LLVMValueRef indir_index = NULL;

   switch (instr->dest.ssa.bit_size) {
   case 16:
   case 32:
      break;
   case 64:
      unreachable("64-bit IO should have been lowered");
      return NULL;
   default:
      unreachable("unhandled load type");
      return NULL;
   }

   if (LLVMGetTypeKind(dest_type) == LLVMVectorTypeKind)
      component_type = LLVMGetElementType(dest_type);
   else
      component_type = dest_type;

   if (nir_src_is_const(offset))
      assert(nir_src_as_uint(offset) == 0);
   else
      indir_index = get_src(ctx, offset);

   if (ctx->stage == MESA_SHADER_TESS_CTRL ||
       (ctx->stage == MESA_SHADER_TESS_EVAL && !is_output)) {
      LLVMValueRef result = ctx->abi->load_tess_varyings(ctx->abi, component_type,
                                                         vertex_index, indir_index,
                                                         base, component,
                                                         count, !is_output);
      if (instr->dest.ssa.bit_size == 16) {
         result = ac_to_integer(&ctx->ac, result);
         result = LLVMBuildTrunc(ctx->ac.builder, result, dest_type, "");
      }
      return LLVMBuildBitCast(ctx->ac.builder, result, dest_type, "");
   }

   /* No indirect indexing is allowed after this point. */
   assert(!indir_index);

   if (ctx->stage == MESA_SHADER_GEOMETRY) {
      assert(nir_src_is_const(*vertex_index_src));

      return ctx->abi->load_inputs(ctx->abi, base, component, count,
                                   nir_src_as_uint(*vertex_index_src), component_type);
   }

   if (ctx->stage == MESA_SHADER_FRAGMENT && is_output &&
       nir_intrinsic_io_semantics(instr).fb_fetch_output)
      return ctx->abi->emit_fbfetch(ctx->abi);

   /* Other non-fragment cases have inputs and outputs in temporaries. */
   if (ctx->stage != MESA_SHADER_FRAGMENT) {
      for (unsigned chan = component; chan < count + component; chan++) {
         if (is_output) {
            values[chan] = LLVMBuildLoad(ctx->ac.builder, ctx->abi->outputs[base * 4 + chan], "");
         } else {
            values[chan] = ctx->abi->inputs[base * 4 + chan];
            if (!values[chan])
               values[chan] = LLVMGetUndef(ctx->ac.i32);
         }
      }
      LLVMValueRef result = ac_build_varying_gather_values(&ctx->ac, values, count, component);
      return LLVMBuildBitCast(ctx->ac.builder, result, dest_type, "");
   }

   /* Fragment shader inputs. */
   unsigned vertex_id = 2; /* P0 */

   if (instr->intrinsic == nir_intrinsic_load_input_vertex) {
      nir_const_value *src0 = nir_src_as_const_value(instr->src[0]);

      switch (src0[0].i32) {
      case 0:
         vertex_id = 2;
         break;
      case 1:
         vertex_id = 0;
         break;
      case 2:
         vertex_id = 1;
         break;
      default:
         unreachable("Invalid vertex index");
      }
   }

   LLVMValueRef attr_number = LLVMConstInt(ctx->ac.i32, base, false);

   for (unsigned chan = 0; chan < count; chan++) {
      LLVMValueRef llvm_chan = LLVMConstInt(ctx->ac.i32, (component + chan) % 4, false);
      values[chan] =
         ac_build_fs_interp_mov(&ctx->ac, LLVMConstInt(ctx->ac.i32, vertex_id, false), llvm_chan,
                                attr_number, ac_get_arg(&ctx->ac, ctx->args->prim_mask));
      values[chan] = LLVMBuildBitCast(ctx->ac.builder, values[chan], ctx->ac.i32, "");
      values[chan] =
         LLVMBuildTruncOrBitCast(ctx->ac.builder, values[chan],
                                 instr->dest.ssa.bit_size == 16 ? ctx->ac.i16 : ctx->ac.i32, "");
   }

   LLVMValueRef result = ac_build_gather_values(&ctx->ac, values, count);
   return LLVMBuildBitCast(ctx->ac.builder, result, dest_type, "");
}

static void visit_intrinsic(struct ac_nir_context *ctx, nir_intrinsic_instr *instr)
{
   LLVMValueRef result = NULL;

   switch (instr->intrinsic) {
   case nir_intrinsic_ballot:
      result = ac_build_ballot(&ctx->ac, get_src(ctx, instr->src[0]));
      if (ctx->ac.ballot_mask_bits > ctx->ac.wave_size)
         result = LLVMBuildZExt(ctx->ac.builder, result, ctx->ac.iN_ballotmask, "");
      break;
   case nir_intrinsic_read_invocation:
      result =
         ac_build_readlane(&ctx->ac, get_src(ctx, instr->src[0]), get_src(ctx, instr->src[1]));
      break;
   case nir_intrinsic_read_first_invocation:
      result = ac_build_readlane(&ctx->ac, get_src(ctx, instr->src[0]), NULL);
      break;
   case nir_intrinsic_load_subgroup_invocation:
      result = ac_get_thread_id(&ctx->ac);
      break;
   case nir_intrinsic_load_work_group_id: {
      LLVMValueRef values[3];

      for (int i = 0; i < 3; i++) {
         values[i] = ctx->args->workgroup_ids[i].used
                        ? ac_get_arg(&ctx->ac, ctx->args->workgroup_ids[i])
                        : ctx->ac.i32_0;
      }

      result = ac_build_gather_values(&ctx->ac, values, 3);
      break;
   }
   case nir_intrinsic_load_base_vertex:
   case nir_intrinsic_load_first_vertex:
      result = ctx->abi->load_base_vertex(ctx->abi);
      break;
   case nir_intrinsic_load_local_group_size:
      result = ctx->abi->load_local_group_size(ctx->abi);
      break;
   case nir_intrinsic_load_vertex_id:
      result = LLVMBuildAdd(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->vertex_id),
                            ac_get_arg(&ctx->ac, ctx->args->base_vertex), "");
      break;
   case nir_intrinsic_load_vertex_id_zero_base: {
      result = ctx->abi->vertex_id;
      break;
   }
   case nir_intrinsic_load_local_invocation_id: {
      result = ac_get_arg(&ctx->ac, ctx->args->local_invocation_ids);
      break;
   }
   case nir_intrinsic_load_base_instance:
      result = ac_get_arg(&ctx->ac, ctx->args->start_instance);
      break;
   case nir_intrinsic_load_draw_id:
      result = ac_get_arg(&ctx->ac, ctx->args->draw_id);
      break;
   case nir_intrinsic_load_view_index:
      result = ac_get_arg(&ctx->ac, ctx->args->view_index);
      break;
   case nir_intrinsic_load_invocation_id:
      if (ctx->stage == MESA_SHADER_TESS_CTRL) {
         result = ac_unpack_param(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->tcs_rel_ids), 8, 5);
      } else {
         if (ctx->ac.chip_class >= GFX10) {
            result =
               LLVMBuildAnd(ctx->ac.builder, ac_get_arg(&ctx->ac, ctx->args->gs_invocation_id),
                            LLVMConstInt(ctx->ac.i32, 127, 0), "");
         } else {
            result = ac_get_arg(&ctx->ac, ctx->args->gs_invocation_id);
         }
      }
      break;
   case nir_intrinsic_load_primitive_id:
      if (ctx->stage == MESA_SHADER_GEOMETRY) {
         result = ac_get_arg(&ctx->ac, ctx->args->gs_prim_id);
      } else if (ctx->stage == MESA_SHADER_TESS_CTRL) {
         result = ac_get_arg(&ctx->ac, ctx->args->tcs_patch_id);
      } else if (ctx->stage == MESA_SHADER_TESS_EVAL) {
         result = ac_get_arg(&ctx->ac, ctx->args->tes_patch_id);
      } else
         fprintf(stderr, "Unknown primitive id intrinsic: %d", ctx->stage);
      break;
   case nir_intrinsic_load_sample_id:
      result = ac_unpack_param(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->ancillary), 8, 4);
      break;
   case nir_intrinsic_load_sample_pos:
      result = load_sample_pos(ctx);
      break;
   case nir_intrinsic_load_sample_mask_in:
      result = ctx->abi->load_sample_mask_in(ctx->abi);
      break;
   case nir_intrinsic_load_frag_coord: {
      LLVMValueRef values[4] = {
         ac_get_arg(&ctx->ac, ctx->args->frag_pos[0]), ac_get_arg(&ctx->ac, ctx->args->frag_pos[1]),
         ac_get_arg(&ctx->ac, ctx->args->frag_pos[2]),
         ac_build_fdiv(&ctx->ac, ctx->ac.f32_1, ac_get_arg(&ctx->ac, ctx->args->frag_pos[3]))};
      result = ac_to_integer(&ctx->ac, ac_build_gather_values(&ctx->ac, values, 4));
      break;
   }
   case nir_intrinsic_load_layer_id:
      result = ctx->abi->inputs[ac_llvm_reg_index_soa(VARYING_SLOT_LAYER, 0)];
      break;
   case nir_intrinsic_load_front_face:
      result = emit_i2b(&ctx->ac, ac_get_arg(&ctx->ac, ctx->args->front_face));
      break;
   case nir_intrinsic_load_helper_invocation:
      result = ac_build_load_helper_invocation(&ctx->ac);
      break;
   case nir_intrinsic_is_helper_invocation:
      result = ac_build_is_helper_invocation(&ctx->ac);
      break;
   case nir_intrinsic_load_color0:
      result = ctx->abi->color0;
      break;
   case nir_intrinsic_load_color1:
      result = ctx->abi->color1;
      break;
   case nir_intrinsic_load_user_data_amd:
      assert(LLVMTypeOf(ctx->abi->user_data) == ctx->ac.v4i32);
      result = ctx->abi->user_data;
      break;
   case nir_intrinsic_load_instance_id:
      result = ctx->abi->instance_id;
      break;
   case nir_intrinsic_load_num_work_groups:
      result = ac_get_arg(&ctx->ac, ctx->args->num_work_groups);
      break;
   case nir_intrinsic_load_local_invocation_index:
      result = visit_load_local_invocation_index(ctx);
      break;
   case nir_intrinsic_load_subgroup_id:
      result = visit_load_subgroup_id(ctx);
      break;
   case nir_intrinsic_load_num_subgroups:
      result = visit_load_num_subgroups(ctx);
      break;
   case nir_intrinsic_first_invocation:
      result = visit_first_invocation(ctx);
      break;
   case nir_intrinsic_load_push_constant:
      result = visit_load_push_constant(ctx, instr);
      break;
   case nir_intrinsic_vulkan_resource_index: {
      LLVMValueRef index = get_src(ctx, instr->src[0]);
      unsigned desc_set = nir_intrinsic_desc_set(instr);
      unsigned binding = nir_intrinsic_binding(instr);

      result = ctx->abi->load_resource(ctx->abi, index, desc_set, binding);
      break;
   }
   case nir_intrinsic_vulkan_resource_reindex:
      result = visit_vulkan_resource_reindex(ctx, instr);
      break;
   case nir_intrinsic_store_ssbo:
      visit_store_ssbo(ctx, instr);
      break;
   case nir_intrinsic_load_ssbo:
      result = visit_load_buffer(ctx, instr);
      break;
   case nir_intrinsic_load_global:
      result = visit_load_global(ctx, instr);
      break;
   case nir_intrinsic_store_global:
      visit_store_global(ctx, instr);
      break;
   case nir_intrinsic_global_atomic_add:
   case nir_intrinsic_global_atomic_imin:
   case nir_intrinsic_global_atomic_umin:
   case nir_intrinsic_global_atomic_imax:
   case nir_intrinsic_global_atomic_umax:
   case nir_intrinsic_global_atomic_and:
   case nir_intrinsic_global_atomic_or:
   case nir_intrinsic_global_atomic_xor:
   case nir_intrinsic_global_atomic_exchange:
   case nir_intrinsic_global_atomic_comp_swap:
      result = visit_global_atomic(ctx, instr);
      break;
   case nir_intrinsic_ssbo_atomic_add:
   case nir_intrinsic_ssbo_atomic_imin:
   case nir_intrinsic_ssbo_atomic_umin:
   case nir_intrinsic_ssbo_atomic_imax:
   case nir_intrinsic_ssbo_atomic_umax:
   case nir_intrinsic_ssbo_atomic_and:
   case nir_intrinsic_ssbo_atomic_or:
   case nir_intrinsic_ssbo_atomic_xor:
   case nir_intrinsic_ssbo_atomic_exchange:
   case nir_intrinsic_ssbo_atomic_comp_swap:
      result = visit_atomic_ssbo(ctx, instr);
      break;
   case nir_intrinsic_load_ubo:
      result = visit_load_ubo_buffer(ctx, instr);
      break;
   case nir_intrinsic_get_ssbo_size:
      result = visit_get_ssbo_size(ctx, instr);
      break;
   case nir_intrinsic_load_input:
   case nir_intrinsic_load_input_vertex:
   case nir_intrinsic_load_per_vertex_input:
      result = visit_load(ctx, instr, false);
      break;
   case nir_intrinsic_load_output:
   case nir_intrinsic_load_per_vertex_output:
      result = visit_load(ctx, instr, true);
      break;
   case nir_intrinsic_store_output:
   case nir_intrinsic_store_per_vertex_output:
      visit_store_output(ctx, instr);
      break;
   case nir_intrinsic_load_shared:
      result = visit_load_shared(ctx, instr);
      break;
   case nir_intrinsic_store_shared:
      visit_store_shared(ctx, instr);
      break;
   case nir_intrinsic_bindless_image_samples:
   case nir_intrinsic_image_deref_samples:
      result = visit_image_samples(ctx, instr);
      break;
   case nir_intrinsic_bindless_image_load:
      result = visit_image_load(ctx, instr, true);
      break;
   case nir_intrinsic_image_deref_load:
      result = visit_image_load(ctx, instr, false);
      break;
   case nir_intrinsic_bindless_image_store:
      visit_image_store(ctx, instr, true);
      break;
   case nir_intrinsic_image_deref_store:
      visit_image_store(ctx, instr, false);
      break;
   case nir_intrinsic_bindless_image_atomic_add:
   case nir_intrinsic_bindless_image_atomic_imin:
   case nir_intrinsic_bindless_image_atomic_umin:
   case nir_intrinsic_bindless_image_atomic_imax:
   case nir_intrinsic_bindless_image_atomic_umax:
   case nir_intrinsic_bindless_image_atomic_and:
   case nir_intrinsic_bindless_image_atomic_or:
   case nir_intrinsic_bindless_image_atomic_xor:
   case nir_intrinsic_bindless_image_atomic_exchange:
   case nir_intrinsic_bindless_image_atomic_comp_swap:
   case nir_intrinsic_bindless_image_atomic_inc_wrap:
   case nir_intrinsic_bindless_image_atomic_dec_wrap:
      result = visit_image_atomic(ctx, instr, true);
      break;
   case nir_intrinsic_image_deref_atomic_add:
   case nir_intrinsic_image_deref_atomic_imin:
   case nir_intrinsic_image_deref_atomic_umin:
   case nir_intrinsic_image_deref_atomic_imax:
   case nir_intrinsic_image_deref_atomic_umax:
   case nir_intrinsic_image_deref_atomic_and:
   case nir_intrinsic_image_deref_atomic_or:
   case nir_intrinsic_image_deref_atomic_xor:
   case nir_intrinsic_image_deref_atomic_exchange:
   case nir_intrinsic_image_deref_atomic_comp_swap:
   case nir_intrinsic_image_deref_atomic_inc_wrap:
   case nir_intrinsic_image_deref_atomic_dec_wrap:
      result = visit_image_atomic(ctx, instr, false);
      break;
   case nir_intrinsic_bindless_image_size:
      result = visit_image_size(ctx, instr, true);
      break;
   case nir_intrinsic_image_deref_size:
      result = visit_image_size(ctx, instr, false);
      break;
   case nir_intrinsic_shader_clock:
      result = ac_build_shader_clock(&ctx->ac, nir_intrinsic_memory_scope(instr));
      break;
   case nir_intrinsic_discard:
   case nir_intrinsic_discard_if:
   case nir_intrinsic_terminate:
   case nir_intrinsic_terminate_if:
      emit_discard(ctx, instr);
      break;
   case nir_intrinsic_demote:
   case nir_intrinsic_demote_if:
      emit_demote(ctx, instr);
      break;
   case nir_intrinsic_memory_barrier:
   case nir_intrinsic_group_memory_barrier:
   case nir_intrinsic_memory_barrier_buffer:
   case nir_intrinsic_memory_barrier_image:
   case nir_intrinsic_memory_barrier_shared:
      emit_membar(&ctx->ac, instr);
      break;
   case nir_intrinsic_scoped_barrier: {
      assert(!(nir_intrinsic_memory_semantics(instr) &
               (NIR_MEMORY_MAKE_AVAILABLE | NIR_MEMORY_MAKE_VISIBLE)));

      nir_variable_mode modes = nir_intrinsic_memory_modes(instr);

      unsigned wait_flags = 0;
      if (modes & (nir_var_mem_global | nir_var_mem_ssbo))
         wait_flags |= AC_WAIT_VLOAD | AC_WAIT_VSTORE;
      if (modes & nir_var_mem_shared)
         wait_flags |= AC_WAIT_LGKM;

      if (wait_flags)
         ac_build_waitcnt(&ctx->ac, wait_flags);

      if (nir_intrinsic_execution_scope(instr) == NIR_SCOPE_WORKGROUP)
         ac_emit_barrier(&ctx->ac, ctx->stage);
      break;
   }
   case nir_intrinsic_memory_barrier_tcs_patch:
      break;
   case nir_intrinsic_control_barrier:
      ac_emit_barrier(&ctx->ac, ctx->stage);
      break;
   case nir_intrinsic_shared_atomic_add:
   case nir_intrinsic_shared_atomic_imin:
   case nir_intrinsic_shared_atomic_umin:
   case nir_intrinsic_shared_atomic_imax:
   case nir_intrinsic_shared_atomic_umax:
   case nir_intrinsic_shared_atomic_and:
   case nir_intrinsic_shared_atomic_or:
   case nir_intrinsic_shared_atomic_xor:
   case nir_intrinsic_shared_atomic_exchange:
   case nir_intrinsic_shared_atomic_comp_swap:
   case nir_intrinsic_shared_atomic_fadd: {
      LLVMValueRef ptr = get_memory_ptr(ctx, instr->src[0], instr->src[1].ssa->bit_size);
      result = visit_var_atomic(ctx, instr, ptr, 1);
      break;
   }
   case nir_intrinsic_deref_atomic_add:
   case nir_intrinsic_deref_atomic_imin:
   case nir_intrinsic_deref_atomic_umin:
   case nir_intrinsic_deref_atomic_imax:
   case nir_intrinsic_deref_atomic_umax:
   case nir_intrinsic_deref_atomic_and:
   case nir_intrinsic_deref_atomic_or:
   case nir_intrinsic_deref_atomic_xor:
   case nir_intrinsic_deref_atomic_exchange:
   case nir_intrinsic_deref_atomic_comp_swap:
   case nir_intrinsic_deref_atomic_fadd: {
      LLVMValueRef ptr = get_src(ctx, instr->src[0]);
      result = visit_var_atomic(ctx, instr, ptr, 1);
      break;
   }
   case nir_intrinsic_load_barycentric_pixel:
      result = barycentric_center(ctx, nir_intrinsic_interp_mode(instr));
      break;
   case nir_intrinsic_load_barycentric_centroid:
      result = barycentric_centroid(ctx, nir_intrinsic_interp_mode(instr));
      break;
   case nir_intrinsic_load_barycentric_sample:
      result = barycentric_sample(ctx, nir_intrinsic_interp_mode(instr));
      break;
   case nir_intrinsic_load_barycentric_model:
      result = barycentric_model(ctx);
      break;
   case nir_intrinsic_load_barycentric_at_offset: {
      LLVMValueRef offset = ac_to_float(&ctx->ac, get_src(ctx, instr->src[0]));
      result = barycentric_offset(ctx, nir_intrinsic_interp_mode(instr), offset);
      break;
   }
   case nir_intrinsic_load_barycentric_at_sample: {
      LLVMValueRef sample_id = get_src(ctx, instr->src[0]);
      result = barycentric_at_sample(ctx, nir_intrinsic_interp_mode(instr), sample_id);
      break;
   }
   case nir_intrinsic_load_interpolated_input: {
      /* We assume any indirect loads have been lowered away */
      ASSERTED nir_const_value *offset = nir_src_as_const_value(instr->src[1]);
      assert(offset);
      assert(offset[0].i32 == 0);

      LLVMValueRef interp_param = get_src(ctx, instr->src[0]);
      unsigned index = nir_intrinsic_base(instr);
      unsigned component = nir_intrinsic_component(instr);
      result = load_interpolated_input(ctx, interp_param, index, component,
                                       instr->dest.ssa.num_components, instr->dest.ssa.bit_size);
      break;
   }
   case nir_intrinsic_emit_vertex:
      ctx->abi->emit_vertex(ctx->abi, nir_intrinsic_stream_id(instr), ctx->abi->outputs);
      break;
   case nir_intrinsic_emit_vertex_with_counter: {
      unsigned stream = nir_intrinsic_stream_id(instr);
      LLVMValueRef next_vertex = get_src(ctx, instr->src[0]);
      ctx->abi->emit_vertex_with_counter(ctx->abi, stream, next_vertex, ctx->abi->outputs);
      break;
   }
   case nir_intrinsic_end_primitive:
   case nir_intrinsic_end_primitive_with_counter:
      ctx->abi->emit_primitive(ctx->abi, nir_intrinsic_stream_id(instr));
      break;
   case nir_intrinsic_load_tess_coord:
      result = ctx->abi->load_tess_coord(ctx->abi);
      break;
   case nir_intrinsic_load_tess_level_outer:
      result = ctx->abi->load_tess_level(ctx->abi, VARYING_SLOT_TESS_LEVEL_OUTER, false);
      break;
   case nir_intrinsic_load_tess_level_inner:
      result = ctx->abi->load_tess_level(ctx->abi, VARYING_SLOT_TESS_LEVEL_INNER, false);
      break;
   case nir_intrinsic_load_tess_level_outer_default:
      result = ctx->abi->load_tess_level(ctx->abi, VARYING_SLOT_TESS_LEVEL_OUTER, true);
      break;
   case nir_intrinsic_load_tess_level_inner_default:
      result = ctx->abi->load_tess_level(ctx->abi, VARYING_SLOT_TESS_LEVEL_INNER, true);
      break;
   case nir_intrinsic_load_patch_vertices_in:
      result = ctx->abi->load_patch_vertices_in(ctx->abi);
      break;
   case nir_intrinsic_vote_all: {
      result = ac_build_vote_all(&ctx->ac, get_src(ctx, instr->src[0]));
      break;
   }
   case nir_intrinsic_vote_any: {
      result = ac_build_vote_any(&ctx->ac, get_src(ctx, instr->src[0]));
      break;
   }
   case nir_intrinsic_shuffle:
      if (ctx->ac.chip_class == GFX8 || ctx->ac.chip_class == GFX9 ||
          (ctx->ac.chip_class >= GFX10 && ctx->ac.wave_size == 32)) {
         result =
            ac_build_shuffle(&ctx->ac, get_src(ctx, instr->src[0]), get_src(ctx, instr->src[1]));
      } else {
         LLVMValueRef src = get_src(ctx, instr->src[0]);
         LLVMValueRef index = get_src(ctx, instr->src[1]);
         LLVMTypeRef type = LLVMTypeOf(src);
         struct waterfall_context wctx;
         LLVMValueRef index_val;

         index_val = enter_waterfall(ctx, &wctx, index, true);

         src = LLVMBuildZExt(ctx->ac.builder, src, ctx->ac.i32, "");

         result = ac_build_intrinsic(&ctx->ac, "llvm.amdgcn.readlane", ctx->ac.i32,
                                     (LLVMValueRef[]){src, index_val}, 2,
                                     AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);

         result = LLVMBuildTrunc(ctx->ac.builder, result, type, "");

         result = exit_waterfall(ctx, &wctx, result);
      }
      break;
   case nir_intrinsic_reduce:
      result = ac_build_reduce(&ctx->ac, get_src(ctx, instr->src[0]), instr->const_index[0],
                               instr->const_index[1]);
      break;
   case nir_intrinsic_inclusive_scan:
      result =
         ac_build_inclusive_scan(&ctx->ac, get_src(ctx, instr->src[0]), instr->const_index[0]);
      break;
   case nir_intrinsic_exclusive_scan:
      result =
         ac_build_exclusive_scan(&ctx->ac, get_src(ctx, instr->src[0]), instr->const_index[0]);
      break;
   case nir_intrinsic_quad_broadcast: {
      unsigned lane = nir_src_as_uint(instr->src[1]);
      result = ac_build_quad_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), lane, lane, lane, lane);
      break;
   }
   case nir_intrinsic_quad_swap_horizontal:
      result = ac_build_quad_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), 1, 0, 3, 2);
      break;
   case nir_intrinsic_quad_swap_vertical:
      result = ac_build_quad_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), 2, 3, 0, 1);
      break;
   case nir_intrinsic_quad_swap_diagonal:
      result = ac_build_quad_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), 3, 2, 1, 0);
      break;
   case nir_intrinsic_quad_swizzle_amd: {
      uint32_t mask = nir_intrinsic_swizzle_mask(instr);
      result = ac_build_quad_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), mask & 0x3,
                                     (mask >> 2) & 0x3, (mask >> 4) & 0x3, (mask >> 6) & 0x3);
      break;
   }
   case nir_intrinsic_masked_swizzle_amd: {
      uint32_t mask = nir_intrinsic_swizzle_mask(instr);
      result = ac_build_ds_swizzle(&ctx->ac, get_src(ctx, instr->src[0]), mask);
      break;
   }
   case nir_intrinsic_write_invocation_amd:
      result = ac_build_writelane(&ctx->ac, get_src(ctx, instr->src[0]),
                                  get_src(ctx, instr->src[1]), get_src(ctx, instr->src[2]));
      break;
   case nir_intrinsic_mbcnt_amd:
      result = ac_build_mbcnt(&ctx->ac, get_src(ctx, instr->src[0]));
      break;
   case nir_intrinsic_load_scratch: {
      LLVMValueRef offset = get_src(ctx, instr->src[0]);
      LLVMValueRef ptr = ac_build_gep0(&ctx->ac, ctx->scratch, offset);
      LLVMTypeRef comp_type = LLVMIntTypeInContext(ctx->ac.context, instr->dest.ssa.bit_size);
      LLVMTypeRef vec_type = instr->dest.ssa.num_components == 1
                                ? comp_type
                                : LLVMVectorType(comp_type, instr->dest.ssa.num_components);
      unsigned addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
      ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, LLVMPointerType(vec_type, addr_space), "");
      result = LLVMBuildLoad(ctx->ac.builder, ptr, "");
      break;
   }
   case nir_intrinsic_store_scratch: {
      LLVMValueRef offset = get_src(ctx, instr->src[1]);
      LLVMValueRef ptr = ac_build_gep0(&ctx->ac, ctx->scratch, offset);
      LLVMTypeRef comp_type = LLVMIntTypeInContext(ctx->ac.context, instr->src[0].ssa->bit_size);
      unsigned addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
      ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, LLVMPointerType(comp_type, addr_space), "");
      LLVMValueRef src = get_src(ctx, instr->src[0]);
      unsigned wrmask = nir_intrinsic_write_mask(instr);
      while (wrmask) {
         int start, count;
         u_bit_scan_consecutive_range(&wrmask, &start, &count);

         LLVMValueRef offset = LLVMConstInt(ctx->ac.i32, start, false);
         LLVMValueRef offset_ptr = LLVMBuildGEP(ctx->ac.builder, ptr, &offset, 1, "");
         LLVMTypeRef vec_type = count == 1 ? comp_type : LLVMVectorType(comp_type, count);
         offset_ptr = LLVMBuildBitCast(ctx->ac.builder, offset_ptr,
                                       LLVMPointerType(vec_type, addr_space), "");
         LLVMValueRef offset_src = ac_extract_components(&ctx->ac, src, start, count);
         LLVMBuildStore(ctx->ac.builder, offset_src, offset_ptr);
      }
      break;
   }
   case nir_intrinsic_load_constant: {
      unsigned base = nir_intrinsic_base(instr);
      unsigned range = nir_intrinsic_range(instr);

      LLVMValueRef offset = get_src(ctx, instr->src[0]);
      offset = LLVMBuildAdd(ctx->ac.builder, offset, LLVMConstInt(ctx->ac.i32, base, false), "");

      /* Clamp the offset to avoid out-of-bound access because global
       * instructions can't handle them.
       */
      LLVMValueRef size = LLVMConstInt(ctx->ac.i32, base + range, false);
      LLVMValueRef cond = LLVMBuildICmp(ctx->ac.builder, LLVMIntULT, offset, size, "");
      offset = LLVMBuildSelect(ctx->ac.builder, cond, offset, size, "");

      LLVMValueRef ptr = ac_build_gep0(&ctx->ac, ctx->constant_data, offset);
      LLVMTypeRef comp_type = LLVMIntTypeInContext(ctx->ac.context, instr->dest.ssa.bit_size);
      LLVMTypeRef vec_type = instr->dest.ssa.num_components == 1
                                ? comp_type
                                : LLVMVectorType(comp_type, instr->dest.ssa.num_components);
      unsigned addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
      ptr = LLVMBuildBitCast(ctx->ac.builder, ptr, LLVMPointerType(vec_type, addr_space), "");
      result = LLVMBuildLoad(ctx->ac.builder, ptr, "");
      break;
   }
   case nir_intrinsic_set_vertex_and_primitive_count:
      /* Currently ignored. */
      break;
   default:
      fprintf(stderr, "Unknown intrinsic: ");
      nir_print_instr(&instr->instr, stderr);
      fprintf(stderr, "\n");
      abort();
      break;
   }
   if (result) {
      ctx->ssa_defs[instr->dest.ssa.index] = result;
   }
}

static LLVMValueRef get_bindless_index_from_uniform(struct ac_nir_context *ctx, unsigned base_index,
                                                    unsigned constant_index,
                                                    LLVMValueRef dynamic_index)
{
   LLVMValueRef offset = LLVMConstInt(ctx->ac.i32, base_index * 4, 0);
   LLVMValueRef index = LLVMBuildAdd(ctx->ac.builder, dynamic_index,
                                     LLVMConstInt(ctx->ac.i32, constant_index, 0), "");

   /* Bindless uniforms are 64bit so multiple index by 8 */
   index = LLVMBuildMul(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i32, 8, 0), "");
   offset = LLVMBuildAdd(ctx->ac.builder, offset, index, "");

   LLVMValueRef ubo_index = ctx->abi->load_ubo(ctx->abi, 0, 0, false, ctx->ac.i32_0);

   LLVMValueRef ret =
      ac_build_buffer_load(&ctx->ac, ubo_index, 1, NULL, offset, NULL, 0, 0, true, true);

   return LLVMBuildBitCast(ctx->ac.builder, ret, ctx->ac.i32, "");
}

struct sampler_desc_address {
   unsigned descriptor_set;
   unsigned base_index; /* binding in vulkan */
   unsigned constant_index;
   LLVMValueRef dynamic_index;
   bool image;
   bool bindless;
};

static struct sampler_desc_address get_sampler_desc_internal(struct ac_nir_context *ctx,
                                                             nir_deref_instr *deref_instr,
                                                             const nir_instr *instr, bool image)
{
   LLVMValueRef index = NULL;
   unsigned constant_index = 0;
   unsigned descriptor_set;
   unsigned base_index;
   bool bindless = false;

   if (!deref_instr) {
      descriptor_set = 0;
      if (image) {
         nir_intrinsic_instr *img_instr = nir_instr_as_intrinsic(instr);
         base_index = 0;
         bindless = true;
         index = get_src(ctx, img_instr->src[0]);
      } else {
         nir_tex_instr *tex_instr = nir_instr_as_tex(instr);
         int sampSrcIdx = nir_tex_instr_src_index(tex_instr, nir_tex_src_sampler_handle);
         if (sampSrcIdx != -1) {
            base_index = 0;
            bindless = true;
            index = get_src(ctx, tex_instr->src[sampSrcIdx].src);
         } else {
            assert(tex_instr && !image);
            base_index = tex_instr->sampler_index;
         }
      }
   } else {
      while (deref_instr->deref_type != nir_deref_type_var) {
         if (deref_instr->deref_type == nir_deref_type_array) {
            unsigned array_size = glsl_get_aoa_size(deref_instr->type);
            if (!array_size)
               array_size = 1;

            if (nir_src_is_const(deref_instr->arr.index)) {
               constant_index += array_size * nir_src_as_uint(deref_instr->arr.index);
            } else {
               LLVMValueRef indirect = get_src(ctx, deref_instr->arr.index);

               indirect = LLVMBuildMul(ctx->ac.builder, indirect,
                                       LLVMConstInt(ctx->ac.i32, array_size, false), "");

               if (!index)
                  index = indirect;
               else
                  index = LLVMBuildAdd(ctx->ac.builder, index, indirect, "");
            }

            deref_instr = nir_src_as_deref(deref_instr->parent);
         } else if (deref_instr->deref_type == nir_deref_type_struct) {
            unsigned sidx = deref_instr->strct.index;
            deref_instr = nir_src_as_deref(deref_instr->parent);
            constant_index += glsl_get_struct_location_offset(deref_instr->type, sidx);
         } else {
            unreachable("Unsupported deref type");
         }
      }
      descriptor_set = deref_instr->var->data.descriptor_set;

      if (deref_instr->var->data.bindless) {
         /* For now just assert on unhandled variable types */
         assert(deref_instr->var->data.mode == nir_var_uniform);

         base_index = deref_instr->var->data.driver_location;
         bindless = true;

         index = index ? index : ctx->ac.i32_0;
         index = get_bindless_index_from_uniform(ctx, base_index, constant_index, index);
      } else
         base_index = deref_instr->var->data.binding;
   }
   return (struct sampler_desc_address){
      .descriptor_set = descriptor_set,
      .base_index = base_index,
      .constant_index = constant_index,
      .dynamic_index = index,
      .image = image,
      .bindless = bindless,
   };
}

/* Extract any possibly divergent index into a separate value that can be fed
 * into get_sampler_desc with the same arguments. */
static LLVMValueRef get_sampler_desc_index(struct ac_nir_context *ctx, nir_deref_instr *deref_instr,
                                           const nir_instr *instr, bool image)
{
   struct sampler_desc_address addr = get_sampler_desc_internal(ctx, deref_instr, instr, image);
   return addr.dynamic_index;
}

static LLVMValueRef get_sampler_desc(struct ac_nir_context *ctx, nir_deref_instr *deref_instr,
                                     enum ac_descriptor_type desc_type, const nir_instr *instr,
                                     LLVMValueRef index, bool image, bool write)
{
   struct sampler_desc_address addr = get_sampler_desc_internal(ctx, deref_instr, instr, image);
   return ctx->abi->load_sampler_desc(ctx->abi, addr.descriptor_set, addr.base_index,
                                      addr.constant_index, index, desc_type, addr.image, write,
                                      addr.bindless);
}

/* Disable anisotropic filtering if BASE_LEVEL == LAST_LEVEL.
 *
 * GFX6-GFX7:
 *   If BASE_LEVEL == LAST_LEVEL, the shader must disable anisotropic
 *   filtering manually. The driver sets img7 to a mask clearing
 *   MAX_ANISO_RATIO if BASE_LEVEL == LAST_LEVEL. The shader must do:
 *     s_and_b32 samp0, samp0, img7
 *
 * GFX8:
 *   The ANISO_OVERRIDE sampler field enables this fix in TA.
 */
static LLVMValueRef sici_fix_sampler_aniso(struct ac_nir_context *ctx, LLVMValueRef res,
                                           LLVMValueRef samp)
{
   LLVMBuilderRef builder = ctx->ac.builder;
   LLVMValueRef img7, samp0;

   if (ctx->ac.chip_class >= GFX8)
      return samp;

   img7 = LLVMBuildExtractElement(builder, res, LLVMConstInt(ctx->ac.i32, 7, 0), "");
   samp0 = LLVMBuildExtractElement(builder, samp, LLVMConstInt(ctx->ac.i32, 0, 0), "");
   samp0 = LLVMBuildAnd(builder, samp0, img7, "");
   return LLVMBuildInsertElement(builder, samp, samp0, LLVMConstInt(ctx->ac.i32, 0, 0), "");
}

static void tex_fetch_ptrs(struct ac_nir_context *ctx, nir_tex_instr *instr,
                           struct waterfall_context *wctx, LLVMValueRef *res_ptr,
                           LLVMValueRef *samp_ptr, LLVMValueRef *fmask_ptr)
{
   nir_deref_instr *texture_deref_instr = NULL;
   nir_deref_instr *sampler_deref_instr = NULL;
   int plane = -1;

   for (unsigned i = 0; i < instr->num_srcs; i++) {
      switch (instr->src[i].src_type) {
      case nir_tex_src_texture_deref:
         texture_deref_instr = nir_src_as_deref(instr->src[i].src);
         break;
      case nir_tex_src_sampler_deref:
         sampler_deref_instr = nir_src_as_deref(instr->src[i].src);
         break;
      case nir_tex_src_plane:
         plane = nir_src_as_int(instr->src[i].src);
         break;
      default:
         break;
      }
   }

   LLVMValueRef texture_dynamic_index =
      get_sampler_desc_index(ctx, texture_deref_instr, &instr->instr, false);
   if (!sampler_deref_instr)
      sampler_deref_instr = texture_deref_instr;

   LLVMValueRef sampler_dynamic_index =
      get_sampler_desc_index(ctx, sampler_deref_instr, &instr->instr, false);
   if (instr->texture_non_uniform)
      texture_dynamic_index = enter_waterfall(ctx, wctx + 0, texture_dynamic_index, true);

   if (instr->sampler_non_uniform)
      sampler_dynamic_index = enter_waterfall(ctx, wctx + 1, sampler_dynamic_index, true);

   enum ac_descriptor_type main_descriptor =
      instr->sampler_dim == GLSL_SAMPLER_DIM_BUF ? AC_DESC_BUFFER : AC_DESC_IMAGE;

   if (plane >= 0) {
      assert(instr->op != nir_texop_txf_ms && instr->op != nir_texop_samples_identical);
      assert(instr->sampler_dim != GLSL_SAMPLER_DIM_BUF);

      main_descriptor = AC_DESC_PLANE_0 + plane;
   }

   if (instr->op == nir_texop_fragment_mask_fetch) {
      /* The fragment mask is fetched from the compressed
       * multisampled surface.
       */
      main_descriptor = AC_DESC_FMASK;
   }

   *res_ptr = get_sampler_desc(ctx, texture_deref_instr, main_descriptor, &instr->instr,
                               texture_dynamic_index, false, false);

   if (samp_ptr) {
      *samp_ptr = get_sampler_desc(ctx, sampler_deref_instr, AC_DESC_SAMPLER, &instr->instr,
                                   sampler_dynamic_index, false, false);
      if (instr->sampler_dim < GLSL_SAMPLER_DIM_RECT)
         *samp_ptr = sici_fix_sampler_aniso(ctx, *res_ptr, *samp_ptr);
   }
   if (fmask_ptr && (instr->op == nir_texop_txf_ms || instr->op == nir_texop_samples_identical))
      *fmask_ptr = get_sampler_desc(ctx, texture_deref_instr, AC_DESC_FMASK, &instr->instr,
                                    texture_dynamic_index, false, false);
}

static LLVMValueRef apply_round_slice(struct ac_llvm_context *ctx, LLVMValueRef coord)
{
   coord = ac_to_float(ctx, coord);
   coord = ac_build_round(ctx, coord);
   coord = ac_to_integer(ctx, coord);
   return coord;
}

static void visit_tex(struct ac_nir_context *ctx, nir_tex_instr *instr)
{
   LLVMValueRef result = NULL;
   struct ac_image_args args = {0};
   LLVMValueRef fmask_ptr = NULL, sample_index = NULL;
   LLVMValueRef ddx = NULL, ddy = NULL;
   unsigned offset_src = 0;
   struct waterfall_context wctx[2] = {{{0}}};

   tex_fetch_ptrs(ctx, instr, wctx, &args.resource, &args.sampler, &fmask_ptr);

   for (unsigned i = 0; i < instr->num_srcs; i++) {
      switch (instr->src[i].src_type) {
      case nir_tex_src_coord: {
         LLVMValueRef coord = get_src(ctx, instr->src[i].src);
         for (unsigned chan = 0; chan < instr->coord_components; ++chan)
            args.coords[chan] = ac_llvm_extract_elem(&ctx->ac, coord, chan);
         break;
      }
      case nir_tex_src_projector:
         break;
      case nir_tex_src_comparator:
         if (instr->is_shadow) {
            args.compare = get_src(ctx, instr->src[i].src);
            args.compare = ac_to_float(&ctx->ac, args.compare);
         }
         break;
      case nir_tex_src_offset:
         args.offset = get_src(ctx, instr->src[i].src);
         offset_src = i;
         break;
      case nir_tex_src_bias:
         args.bias = get_src(ctx, instr->src[i].src);
         break;
      case nir_tex_src_lod: {
         if (nir_src_is_const(instr->src[i].src) && nir_src_as_uint(instr->src[i].src) == 0)
            args.level_zero = true;
         else
            args.lod = get_src(ctx, instr->src[i].src);
         break;
      }
      case nir_tex_src_ms_index:
         sample_index = get_src(ctx, instr->src[i].src);
         break;
      case nir_tex_src_ms_mcs:
         break;
      case nir_tex_src_ddx:
         ddx = get_src(ctx, instr->src[i].src);
         break;
      case nir_tex_src_ddy:
         ddy = get_src(ctx, instr->src[i].src);
         break;
      case nir_tex_src_min_lod:
         args.min_lod = get_src(ctx, instr->src[i].src);
         break;
      case nir_tex_src_texture_offset:
      case nir_tex_src_sampler_offset:
      case nir_tex_src_plane:
      default:
         break;
      }
   }

   if (instr->op == nir_texop_txs && instr->sampler_dim == GLSL_SAMPLER_DIM_BUF) {
      result = get_buffer_size(ctx, args.resource, true);
      goto write_result;
   }

   if (instr->op == nir_texop_texture_samples) {
      LLVMValueRef res, samples, is_msaa;
      LLVMValueRef default_sample;

      res = LLVMBuildBitCast(ctx->ac.builder, args.resource, ctx->ac.v8i32, "");
      samples =
         LLVMBuildExtractElement(ctx->ac.builder, res, LLVMConstInt(ctx->ac.i32, 3, false), "");
      is_msaa = LLVMBuildLShr(ctx->ac.builder, samples, LLVMConstInt(ctx->ac.i32, 28, false), "");
      is_msaa = LLVMBuildAnd(ctx->ac.builder, is_msaa, LLVMConstInt(ctx->ac.i32, 0xe, false), "");
      is_msaa = LLVMBuildICmp(ctx->ac.builder, LLVMIntEQ, is_msaa,
                              LLVMConstInt(ctx->ac.i32, 0xe, false), "");

      samples = LLVMBuildLShr(ctx->ac.builder, samples, LLVMConstInt(ctx->ac.i32, 16, false), "");
      samples = LLVMBuildAnd(ctx->ac.builder, samples, LLVMConstInt(ctx->ac.i32, 0xf, false), "");
      samples = LLVMBuildShl(ctx->ac.builder, ctx->ac.i32_1, samples, "");

      if (ctx->abi->robust_buffer_access) {
         LLVMValueRef dword1, is_null_descriptor;

         /* Extract the second dword of the descriptor, if it's
          * all zero, then it's a null descriptor.
          */
         dword1 =
            LLVMBuildExtractElement(ctx->ac.builder, res, LLVMConstInt(ctx->ac.i32, 1, false), "");
         is_null_descriptor = LLVMBuildICmp(ctx->ac.builder, LLVMIntEQ, dword1,
                                            LLVMConstInt(ctx->ac.i32, 0, false), "");
         default_sample =
            LLVMBuildSelect(ctx->ac.builder, is_null_descriptor, ctx->ac.i32_0, ctx->ac.i32_1, "");
      } else {
         default_sample = ctx->ac.i32_1;
      }

      samples = LLVMBuildSelect(ctx->ac.builder, is_msaa, samples, default_sample, "");
      result = samples;
      goto write_result;
   }

   if (args.offset && instr->op != nir_texop_txf && instr->op != nir_texop_txf_ms) {
      LLVMValueRef offset[3], pack;
      for (unsigned chan = 0; chan < 3; ++chan)
         offset[chan] = ctx->ac.i32_0;

      unsigned num_components = ac_get_llvm_num_components(args.offset);
      for (unsigned chan = 0; chan < num_components; chan++) {
         offset[chan] = ac_llvm_extract_elem(&ctx->ac, args.offset, chan);
         offset[chan] =
            LLVMBuildAnd(ctx->ac.builder, offset[chan], LLVMConstInt(ctx->ac.i32, 0x3f, false), "");
         if (chan)
            offset[chan] = LLVMBuildShl(ctx->ac.builder, offset[chan],
                                        LLVMConstInt(ctx->ac.i32, chan * 8, false), "");
      }
      pack = LLVMBuildOr(ctx->ac.builder, offset[0], offset[1], "");
      pack = LLVMBuildOr(ctx->ac.builder, pack, offset[2], "");
      args.offset = pack;
   }

   /* Section 8.23.1 (Depth Texture Comparison Mode) of the
    * OpenGL 4.5 spec says:
    *
    *    "If the texture’s internal format indicates a fixed-point
    *     depth texture, then D_t and D_ref are clamped to the
    *     range [0, 1]; otherwise no clamping is performed."
    *
    * TC-compatible HTILE promotes Z16 and Z24 to Z32_FLOAT,
    * so the depth comparison value isn't clamped for Z16 and
    * Z24 anymore. Do it manually here for GFX8-9; GFX10 has
    * an explicitly clamped 32-bit float format.
    */
   if (args.compare && ctx->ac.chip_class >= GFX8 && ctx->ac.chip_class <= GFX9 &&
       ctx->abi->clamp_shadow_reference) {
      LLVMValueRef upgraded, clamped;

      upgraded = LLVMBuildExtractElement(ctx->ac.builder, args.sampler,
                                         LLVMConstInt(ctx->ac.i32, 3, false), "");
      upgraded = LLVMBuildLShr(ctx->ac.builder, upgraded, LLVMConstInt(ctx->ac.i32, 29, false), "");
      upgraded = LLVMBuildTrunc(ctx->ac.builder, upgraded, ctx->ac.i1, "");
      clamped = ac_build_clamp(&ctx->ac, args.compare);
      args.compare = LLVMBuildSelect(ctx->ac.builder, upgraded, clamped, args.compare, "");
   }

   /* pack derivatives */
   if (ddx || ddy) {
      int num_src_deriv_channels, num_dest_deriv_channels;
      switch (instr->sampler_dim) {
      case GLSL_SAMPLER_DIM_3D:
      case GLSL_SAMPLER_DIM_CUBE:
         num_src_deriv_channels = 3;
         num_dest_deriv_channels = 3;
         break;
      case GLSL_SAMPLER_DIM_2D:
      default:
         num_src_deriv_channels = 2;
         num_dest_deriv_channels = 2;
         break;
      case GLSL_SAMPLER_DIM_1D:
         num_src_deriv_channels = 1;
         if (ctx->ac.chip_class == GFX9) {
            num_dest_deriv_channels = 2;
         } else {
            num_dest_deriv_channels = 1;
         }
         break;
      }

      for (unsigned i = 0; i < num_src_deriv_channels; i++) {
         args.derivs[i] = ac_to_float(&ctx->ac, ac_llvm_extract_elem(&ctx->ac, ddx, i));
         args.derivs[num_dest_deriv_channels + i] =
            ac_to_float(&ctx->ac, ac_llvm_extract_elem(&ctx->ac, ddy, i));
      }
      for (unsigned i = num_src_deriv_channels; i < num_dest_deriv_channels; i++) {
         args.derivs[i] = ctx->ac.f32_0;
         args.derivs[num_dest_deriv_channels + i] = ctx->ac.f32_0;
      }
   }

   if (instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE && args.coords[0]) {
      for (unsigned chan = 0; chan < instr->coord_components; chan++)
         args.coords[chan] = ac_to_float(&ctx->ac, args.coords[chan]);
      if (instr->coord_components == 3)
         args.coords[3] = LLVMGetUndef(ctx->ac.f32);
      ac_prepare_cube_coords(&ctx->ac, instr->op == nir_texop_txd, instr->is_array,
                             instr->op == nir_texop_lod, args.coords, args.derivs);
   }

   /* Texture coordinates fixups */
   if (instr->coord_components > 1 && instr->sampler_dim == GLSL_SAMPLER_DIM_1D &&
       instr->is_array && instr->op != nir_texop_txf) {
      args.coords[1] = apply_round_slice(&ctx->ac, args.coords[1]);
   }

   if (instr->coord_components > 2 &&
       (instr->sampler_dim == GLSL_SAMPLER_DIM_2D || instr->sampler_dim == GLSL_SAMPLER_DIM_MS ||
        instr->sampler_dim == GLSL_SAMPLER_DIM_SUBPASS ||
        instr->sampler_dim == GLSL_SAMPLER_DIM_SUBPASS_MS) &&
       instr->is_array && instr->op != nir_texop_txf && instr->op != nir_texop_txf_ms &&
       instr->op != nir_texop_fragment_fetch && instr->op != nir_texop_fragment_mask_fetch) {
      args.coords[2] = apply_round_slice(&ctx->ac, args.coords[2]);
   }

   if (ctx->ac.chip_class == GFX9 && instr->sampler_dim == GLSL_SAMPLER_DIM_1D &&
       instr->op != nir_texop_lod) {
      LLVMValueRef filler;
      if (instr->op == nir_texop_txf)
         filler = ctx->ac.i32_0;
      else
         filler = LLVMConstReal(ctx->ac.f32, 0.5);

      if (instr->is_array)
         args.coords[2] = args.coords[1];
      args.coords[1] = filler;
   }

   /* Pack sample index */
   if (sample_index && (instr->op == nir_texop_txf_ms || instr->op == nir_texop_fragment_fetch))
      args.coords[instr->coord_components] = sample_index;

   if (instr->op == nir_texop_samples_identical) {
      struct ac_image_args txf_args = {0};
      memcpy(txf_args.coords, args.coords, sizeof(txf_args.coords));

      txf_args.dmask = 0xf;
      txf_args.resource = fmask_ptr;
      txf_args.dim = instr->is_array ? ac_image_2darray : ac_image_2d;
      result = build_tex_intrinsic(ctx, instr, &txf_args);

      result = LLVMBuildExtractElement(ctx->ac.builder, result, ctx->ac.i32_0, "");
      result = emit_int_cmp(&ctx->ac, LLVMIntEQ, result, ctx->ac.i32_0);
      goto write_result;
   }

   if ((instr->sampler_dim == GLSL_SAMPLER_DIM_SUBPASS_MS ||
        instr->sampler_dim == GLSL_SAMPLER_DIM_MS) &&
       instr->op != nir_texop_txs && instr->op != nir_texop_fragment_fetch &&
       instr->op != nir_texop_fragment_mask_fetch) {
      unsigned sample_chan = instr->is_array ? 3 : 2;
      args.coords[sample_chan] = adjust_sample_index_using_fmask(
         &ctx->ac, args.coords[0], args.coords[1], instr->is_array ? args.coords[2] : NULL,
         args.coords[sample_chan], fmask_ptr);
   }

   if (args.offset && (instr->op == nir_texop_txf || instr->op == nir_texop_txf_ms)) {
      int num_offsets = instr->src[offset_src].src.ssa->num_components;
      num_offsets = MIN2(num_offsets, instr->coord_components);
      for (unsigned i = 0; i < num_offsets; ++i) {
         LLVMValueRef off = ac_llvm_extract_elem(&ctx->ac, args.offset, i);
         args.coords[i] = LLVMBuildAdd(ctx->ac.builder, args.coords[i], off, "");
      }
      args.offset = NULL;
   }

   /* DMASK was repurposed for GATHER4. 4 components are always
    * returned and DMASK works like a swizzle - it selects
    * the component to fetch. The only valid DMASK values are
    * 1=red, 2=green, 4=blue, 8=alpha. (e.g. 1 returns
    * (red,red,red,red) etc.) The ISA document doesn't mention
    * this.
    */
   args.dmask = 0xf;
   if (instr->op == nir_texop_tg4) {
      if (instr->is_shadow)
         args.dmask = 1;
      else
         args.dmask = 1 << instr->component;
   }

   if (instr->sampler_dim != GLSL_SAMPLER_DIM_BUF) {
      args.dim = ac_get_sampler_dim(ctx->ac.chip_class, instr->sampler_dim, instr->is_array);
      args.unorm = instr->sampler_dim == GLSL_SAMPLER_DIM_RECT;
   }

   /* Adjust the number of coordinates because we only need (x,y) for 2D
    * multisampled images and (x,y,layer) for 2D multisampled layered
    * images or for multisampled input attachments.
    */
   if (instr->op == nir_texop_fragment_mask_fetch) {
      if (args.dim == ac_image_2dmsaa) {
         args.dim = ac_image_2d;
      } else {
         assert(args.dim == ac_image_2darraymsaa);
         args.dim = ac_image_2darray;
      }
   }

   assert(instr->dest.is_ssa);
   args.d16 = instr->dest.ssa.bit_size == 16;

   result = build_tex_intrinsic(ctx, instr, &args);

   if (instr->op == nir_texop_query_levels)
      result =
         LLVMBuildExtractElement(ctx->ac.builder, result, LLVMConstInt(ctx->ac.i32, 3, false), "");
   else if (instr->is_shadow && instr->is_new_style_shadow && instr->op != nir_texop_txs &&
            instr->op != nir_texop_lod && instr->op != nir_texop_tg4)
      result = LLVMBuildExtractElement(ctx->ac.builder, result, ctx->ac.i32_0, "");
   else if (instr->op == nir_texop_txs && instr->sampler_dim == GLSL_SAMPLER_DIM_CUBE &&
            instr->is_array) {
      LLVMValueRef two = LLVMConstInt(ctx->ac.i32, 2, false);
      LLVMValueRef six = LLVMConstInt(ctx->ac.i32, 6, false);
      LLVMValueRef z = LLVMBuildExtractElement(ctx->ac.builder, result, two, "");
      z = LLVMBuildSDiv(ctx->ac.builder, z, six, "");
      result = LLVMBuildInsertElement(ctx->ac.builder, result, z, two, "");
   } else if (ctx->ac.chip_class == GFX9 && instr->op == nir_texop_txs &&
              instr->sampler_dim == GLSL_SAMPLER_DIM_1D && instr->is_array) {
      LLVMValueRef two = LLVMConstInt(ctx->ac.i32, 2, false);
      LLVMValueRef layers = LLVMBuildExtractElement(ctx->ac.builder, result, two, "");
      result = LLVMBuildInsertElement(ctx->ac.builder, result, layers, ctx->ac.i32_1, "");
   } else if (instr->dest.ssa.num_components != 4)
      result = ac_trim_vector(&ctx->ac, result, instr->dest.ssa.num_components);

write_result:
   if (result) {
      assert(instr->dest.is_ssa);
      result = ac_to_integer(&ctx->ac, result);

      for (int i = ARRAY_SIZE(wctx); --i >= 0;) {
         result = exit_waterfall(ctx, wctx + i, result);
      }

      ctx->ssa_defs[instr->dest.ssa.index] = result;
   }
}

static void visit_phi(struct ac_nir_context *ctx, nir_phi_instr *instr)
{
   LLVMTypeRef type = get_def_type(ctx, &instr->dest.ssa);
   LLVMValueRef result = LLVMBuildPhi(ctx->ac.builder, type, "");

   ctx->ssa_defs[instr->dest.ssa.index] = result;
   _mesa_hash_table_insert(ctx->phis, instr, result);
}

static void visit_post_phi(struct ac_nir_context *ctx, nir_phi_instr *instr, LLVMValueRef llvm_phi)
{
   nir_foreach_phi_src (src, instr) {
      LLVMBasicBlockRef block = get_block(ctx, src->pred);
      LLVMValueRef llvm_src = get_src(ctx, src->src);

      LLVMAddIncoming(llvm_phi, &llvm_src, &block, 1);
   }
}

static void phi_post_pass(struct ac_nir_context *ctx)
{
   hash_table_foreach(ctx->phis, entry)
   {
      visit_post_phi(ctx, (nir_phi_instr *)entry->key, (LLVMValueRef)entry->data);
   }
}

static bool is_def_used_in_an_export(const nir_ssa_def *def)
{
   nir_foreach_use (use_src, def) {
      if (use_src->parent_instr->type == nir_instr_type_intrinsic) {
         nir_intrinsic_instr *instr = nir_instr_as_intrinsic(use_src->parent_instr);
         if (instr->intrinsic == nir_intrinsic_store_deref)
            return true;
      } else if (use_src->parent_instr->type == nir_instr_type_alu) {
         nir_alu_instr *instr = nir_instr_as_alu(use_src->parent_instr);
         if (instr->op == nir_op_vec4 && is_def_used_in_an_export(&instr->dest.dest.ssa)) {
            return true;
         }
      }
   }
   return false;
}

static void visit_ssa_undef(struct ac_nir_context *ctx, const nir_ssa_undef_instr *instr)
{
   unsigned num_components = instr->def.num_components;
   LLVMTypeRef type = LLVMIntTypeInContext(ctx->ac.context, instr->def.bit_size);

   if (!ctx->abi->convert_undef_to_zero || is_def_used_in_an_export(&instr->def)) {
      LLVMValueRef undef;

      if (num_components == 1)
         undef = LLVMGetUndef(type);
      else {
         undef = LLVMGetUndef(LLVMVectorType(type, num_components));
      }
      ctx->ssa_defs[instr->def.index] = undef;
   } else {
      LLVMValueRef zero = LLVMConstInt(type, 0, false);
      if (num_components > 1) {
         zero = ac_build_gather_values_extended(&ctx->ac, &zero, 4, 0, false, false);
      }
      ctx->ssa_defs[instr->def.index] = zero;
   }
}

static void visit_jump(struct ac_llvm_context *ctx, const nir_jump_instr *instr)
{
   switch (instr->type) {
   case nir_jump_break:
      ac_build_break(ctx);
      break;
   case nir_jump_continue:
      ac_build_continue(ctx);
      break;
   default:
      fprintf(stderr, "Unknown NIR jump instr: ");
      nir_print_instr(&instr->instr, stderr);
      fprintf(stderr, "\n");
      abort();
   }
}

static LLVMTypeRef glsl_base_to_llvm_type(struct ac_llvm_context *ac, enum glsl_base_type type)
{
   switch (type) {
   case GLSL_TYPE_INT:
   case GLSL_TYPE_UINT:
   case GLSL_TYPE_BOOL:
   case GLSL_TYPE_SUBROUTINE:
      return ac->i32;
   case GLSL_TYPE_INT8:
   case GLSL_TYPE_UINT8:
      return ac->i8;
   case GLSL_TYPE_INT16:
   case GLSL_TYPE_UINT16:
      return ac->i16;
   case GLSL_TYPE_FLOAT:
      return ac->f32;
   case GLSL_TYPE_FLOAT16:
      return ac->f16;
   case GLSL_TYPE_INT64:
   case GLSL_TYPE_UINT64:
      return ac->i64;
   case GLSL_TYPE_DOUBLE:
      return ac->f64;
   default:
      unreachable("unknown GLSL type");
   }
}

static LLVMTypeRef glsl_to_llvm_type(struct ac_llvm_context *ac, const struct glsl_type *type)
{
   if (glsl_type_is_scalar(type)) {
      return glsl_base_to_llvm_type(ac, glsl_get_base_type(type));
   }

   if (glsl_type_is_vector(type)) {
      return LLVMVectorType(glsl_base_to_llvm_type(ac, glsl_get_base_type(type)),
                            glsl_get_vector_elements(type));
   }

   if (glsl_type_is_matrix(type)) {
      return LLVMArrayType(glsl_to_llvm_type(ac, glsl_get_column_type(type)),
                           glsl_get_matrix_columns(type));
   }

   if (glsl_type_is_array(type)) {
      return LLVMArrayType(glsl_to_llvm_type(ac, glsl_get_array_element(type)),
                           glsl_get_length(type));
   }

   assert(glsl_type_is_struct_or_ifc(type));

   LLVMTypeRef *const member_types = alloca(glsl_get_length(type) * sizeof(LLVMTypeRef));

   for (unsigned i = 0; i < glsl_get_length(type); i++) {
      member_types[i] = glsl_to_llvm_type(ac, glsl_get_struct_field(type, i));
   }

   return LLVMStructTypeInContext(ac->context, member_types, glsl_get_length(type), false);
}

static void visit_deref(struct ac_nir_context *ctx, nir_deref_instr *instr)
{
   if (!nir_deref_mode_is_one_of(instr, nir_var_mem_shared | nir_var_mem_global))
      return;

   LLVMValueRef result = NULL;
   switch (instr->deref_type) {
   case nir_deref_type_var: {
      struct hash_entry *entry = _mesa_hash_table_search(ctx->vars, instr->var);
      result = entry->data;
      break;
   }
   case nir_deref_type_struct:
      if (nir_deref_mode_is(instr, nir_var_mem_global)) {
         nir_deref_instr *parent = nir_deref_instr_parent(instr);
         uint64_t offset = glsl_get_struct_field_offset(parent->type, instr->strct.index);
         result = ac_build_gep_ptr(&ctx->ac, get_src(ctx, instr->parent),
                                   LLVMConstInt(ctx->ac.i32, offset, 0));
      } else {
         result = ac_build_gep0(&ctx->ac, get_src(ctx, instr->parent),
                                LLVMConstInt(ctx->ac.i32, instr->strct.index, 0));
      }
      break;
   case nir_deref_type_array:
      if (nir_deref_mode_is(instr, nir_var_mem_global)) {
         nir_deref_instr *parent = nir_deref_instr_parent(instr);
         unsigned stride = glsl_get_explicit_stride(parent->type);

         if ((glsl_type_is_matrix(parent->type) && glsl_matrix_type_is_row_major(parent->type)) ||
             (glsl_type_is_vector(parent->type) && stride == 0))
            stride = type_scalar_size_bytes(parent->type);

         assert(stride > 0);
         LLVMValueRef index = get_src(ctx, instr->arr.index);
         if (LLVMTypeOf(index) != ctx->ac.i64)
            index = LLVMBuildZExt(ctx->ac.builder, index, ctx->ac.i64, "");

         LLVMValueRef offset =
            LLVMBuildMul(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i64, stride, 0), "");

         result = ac_build_gep_ptr(&ctx->ac, get_src(ctx, instr->parent), offset);
      } else {
         result =
            ac_build_gep0(&ctx->ac, get_src(ctx, instr->parent), get_src(ctx, instr->arr.index));
      }
      break;
   case nir_deref_type_ptr_as_array:
      if (nir_deref_mode_is(instr, nir_var_mem_global)) {
         unsigned stride = nir_deref_instr_array_stride(instr);

         LLVMValueRef index = get_src(ctx, instr->arr.index);
         if (LLVMTypeOf(index) != ctx->ac.i64)
            index = LLVMBuildZExt(ctx->ac.builder, index, ctx->ac.i64, "");

         LLVMValueRef offset =
            LLVMBuildMul(ctx->ac.builder, index, LLVMConstInt(ctx->ac.i64, stride, 0), "");

         result = ac_build_gep_ptr(&ctx->ac, get_src(ctx, instr->parent), offset);
      } else {
         result =
            ac_build_gep_ptr(&ctx->ac, get_src(ctx, instr->parent), get_src(ctx, instr->arr.index));
      }
      break;
   case nir_deref_type_cast: {
      result = get_src(ctx, instr->parent);

      /* We can't use the structs from LLVM because the shader
       * specifies its own offsets. */
      LLVMTypeRef pointee_type = ctx->ac.i8;
      if (nir_deref_mode_is(instr, nir_var_mem_shared))
         pointee_type = glsl_to_llvm_type(&ctx->ac, instr->type);

      unsigned address_space;

      switch (instr->modes) {
      case nir_var_mem_shared:
         address_space = AC_ADDR_SPACE_LDS;
         break;
      case nir_var_mem_global:
         address_space = AC_ADDR_SPACE_GLOBAL;
         break;
      default:
         unreachable("Unhandled address space");
      }

      LLVMTypeRef type = LLVMPointerType(pointee_type, address_space);

      if (LLVMTypeOf(result) != type) {
         if (LLVMGetTypeKind(LLVMTypeOf(result)) == LLVMVectorTypeKind) {
            result = LLVMBuildBitCast(ctx->ac.builder, result, type, "");
         } else {
            result = LLVMBuildIntToPtr(ctx->ac.builder, result, type, "");
         }
      }
      break;
   }
   default:
      unreachable("Unhandled deref_instr deref type");
   }

   ctx->ssa_defs[instr->dest.ssa.index] = result;
}

static void visit_cf_list(struct ac_nir_context *ctx, struct exec_list *list);

static void visit_block(struct ac_nir_context *ctx, nir_block *block)
{
   nir_foreach_instr (instr, block) {
      switch (instr->type) {
      case nir_instr_type_alu:
         visit_alu(ctx, nir_instr_as_alu(instr));
         break;
      case nir_instr_type_load_const:
         visit_load_const(ctx, nir_instr_as_load_const(instr));
         break;
      case nir_instr_type_intrinsic:
         visit_intrinsic(ctx, nir_instr_as_intrinsic(instr));
         break;
      case nir_instr_type_tex:
         visit_tex(ctx, nir_instr_as_tex(instr));
         break;
      case nir_instr_type_phi:
         visit_phi(ctx, nir_instr_as_phi(instr));
         break;
      case nir_instr_type_ssa_undef:
         visit_ssa_undef(ctx, nir_instr_as_ssa_undef(instr));
         break;
      case nir_instr_type_jump:
         visit_jump(&ctx->ac, nir_instr_as_jump(instr));
         break;
      case nir_instr_type_deref:
         visit_deref(ctx, nir_instr_as_deref(instr));
         break;
      default:
         fprintf(stderr, "Unknown NIR instr type: ");
         nir_print_instr(instr, stderr);
         fprintf(stderr, "\n");
         abort();
      }
   }

   _mesa_hash_table_insert(ctx->defs, block, LLVMGetInsertBlock(ctx->ac.builder));
}

static void visit_if(struct ac_nir_context *ctx, nir_if *if_stmt)
{
   LLVMValueRef value = get_src(ctx, if_stmt->condition);

   nir_block *then_block = (nir_block *)exec_list_get_head(&if_stmt->then_list);

   ac_build_ifcc(&ctx->ac, value, then_block->index);

   visit_cf_list(ctx, &if_stmt->then_list);

   if (!exec_list_is_empty(&if_stmt->else_list)) {
      nir_block *else_block = (nir_block *)exec_list_get_head(&if_stmt->else_list);

      ac_build_else(&ctx->ac, else_block->index);
      visit_cf_list(ctx, &if_stmt->else_list);
   }

   ac_build_endif(&ctx->ac, then_block->index);
}

static void visit_loop(struct ac_nir_context *ctx, nir_loop *loop)
{
   nir_block *first_loop_block = (nir_block *)exec_list_get_head(&loop->body);

   ac_build_bgnloop(&ctx->ac, first_loop_block->index);

   visit_cf_list(ctx, &loop->body);

   ac_build_endloop(&ctx->ac, first_loop_block->index);
}

static void visit_cf_list(struct ac_nir_context *ctx, struct exec_list *list)
{
   foreach_list_typed(nir_cf_node, node, node, list)
   {
      switch (node->type) {
      case nir_cf_node_block:
         visit_block(ctx, nir_cf_node_as_block(node));
         break;

      case nir_cf_node_if:
         visit_if(ctx, nir_cf_node_as_if(node));
         break;

      case nir_cf_node_loop:
         visit_loop(ctx, nir_cf_node_as_loop(node));
         break;

      default:
         assert(0);
      }
   }
}

void ac_handle_shader_output_decl(struct ac_llvm_context *ctx, struct ac_shader_abi *abi,
                                  struct nir_shader *nir, struct nir_variable *variable,
                                  gl_shader_stage stage)
{
   unsigned output_loc = variable->data.driver_location;
   unsigned attrib_count = glsl_count_attribute_slots(variable->type, false);

   /* tess ctrl has it's own load/store paths for outputs */
   if (stage == MESA_SHADER_TESS_CTRL)
      return;

   if (stage == MESA_SHADER_VERTEX || stage == MESA_SHADER_TESS_EVAL ||
       stage == MESA_SHADER_GEOMETRY) {
      int idx = variable->data.location + variable->data.index;
      if (idx == VARYING_SLOT_CLIP_DIST0) {
         int length = nir->info.clip_distance_array_size + nir->info.cull_distance_array_size;

         if (length > 4)
            attrib_count = 2;
         else
            attrib_count = 1;
      }
   }

   bool is_16bit = glsl_type_is_16bit(glsl_without_array(variable->type));
   LLVMTypeRef type = is_16bit ? ctx->f16 : ctx->f32;
   for (unsigned i = 0; i < attrib_count; ++i) {
      for (unsigned chan = 0; chan < 4; chan++) {
         abi->outputs[ac_llvm_reg_index_soa(output_loc + i, chan)] =
            ac_build_alloca_undef(ctx, type, "");
      }
   }
}

static void setup_scratch(struct ac_nir_context *ctx, struct nir_shader *shader)
{
   if (shader->scratch_size == 0)
      return;

   ctx->scratch =
      ac_build_alloca_undef(&ctx->ac, LLVMArrayType(ctx->ac.i8, shader->scratch_size), "scratch");
}

static void setup_constant_data(struct ac_nir_context *ctx, struct nir_shader *shader)
{
   if (!shader->constant_data)
      return;

   LLVMValueRef data = LLVMConstStringInContext(ctx->ac.context, shader->constant_data,
                                                shader->constant_data_size, true);
   LLVMTypeRef type = LLVMArrayType(ctx->ac.i8, shader->constant_data_size);

   /* We want to put the constant data in the CONST address space so that
    * we can use scalar loads. However, LLVM versions before 10 put these
    * variables in the same section as the code, which is unacceptable
    * for RadeonSI as it needs to relocate all the data sections after
    * the code sections. See https://reviews.llvm.org/D65813.
    */
   unsigned address_space = LLVM_VERSION_MAJOR < 10 ? AC_ADDR_SPACE_GLOBAL : AC_ADDR_SPACE_CONST;

   LLVMValueRef global =
      LLVMAddGlobalInAddressSpace(ctx->ac.module, type, "const_data", address_space);

   LLVMSetInitializer(global, data);
   LLVMSetGlobalConstant(global, true);
   LLVMSetVisibility(global, LLVMHiddenVisibility);
   ctx->constant_data = global;
}

static void setup_shared(struct ac_nir_context *ctx, struct nir_shader *nir)
{
   if (ctx->ac.lds)
      return;

   LLVMTypeRef type = LLVMArrayType(ctx->ac.i8, nir->info.cs.shared_size);

   LLVMValueRef lds =
      LLVMAddGlobalInAddressSpace(ctx->ac.module, type, "compute_lds", AC_ADDR_SPACE_LDS);
   LLVMSetAlignment(lds, 64 * 1024);

   ctx->ac.lds =
      LLVMBuildBitCast(ctx->ac.builder, lds, LLVMPointerType(ctx->ac.i8, AC_ADDR_SPACE_LDS), "");
}

void ac_nir_translate(struct ac_llvm_context *ac, struct ac_shader_abi *abi,
                      const struct ac_shader_args *args, struct nir_shader *nir)
{
   struct ac_nir_context ctx = {0};
   struct nir_function *func;

   ctx.ac = *ac;
   ctx.abi = abi;
   ctx.args = args;

   ctx.stage = nir->info.stage;
   ctx.info = &nir->info;

   ctx.main_function = LLVMGetBasicBlockParent(LLVMGetInsertBlock(ctx.ac.builder));

   /* TODO: remove this after RADV switches to lowered IO */
   if (!nir->info.io_lowered) {
      nir_foreach_shader_out_variable(variable, nir)
      {
         ac_handle_shader_output_decl(&ctx.ac, ctx.abi, nir, variable, ctx.stage);
      }
   }

   ctx.defs = _mesa_hash_table_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);
   ctx.phis = _mesa_hash_table_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);
   ctx.vars = _mesa_hash_table_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);

   if (ctx.abi->kill_ps_if_inf_interp)
      ctx.verified_interp =
         _mesa_hash_table_create(NULL, _mesa_hash_pointer, _mesa_key_pointer_equal);

   func = (struct nir_function *)exec_list_get_head(&nir->functions);

   nir_index_ssa_defs(func->impl);
   ctx.ssa_defs = calloc(func->impl->ssa_alloc, sizeof(LLVMValueRef));

   setup_scratch(&ctx, nir);
   setup_constant_data(&ctx, nir);

   if (gl_shader_stage_is_compute(nir->info.stage))
      setup_shared(&ctx, nir);

   if (nir->info.stage == MESA_SHADER_FRAGMENT && nir->info.fs.uses_demote) {
      ctx.ac.postponed_kill = ac_build_alloca_undef(&ctx.ac, ac->i1, "");
      /* true = don't kill. */
      LLVMBuildStore(ctx.ac.builder, ctx.ac.i1true, ctx.ac.postponed_kill);
   }

   visit_cf_list(&ctx, &func->impl->body);
   phi_post_pass(&ctx);

   if (ctx.ac.postponed_kill)
      ac_build_kill_if_false(&ctx.ac, LLVMBuildLoad(ctx.ac.builder, ctx.ac.postponed_kill, ""));

   if (!gl_shader_stage_is_compute(nir->info.stage))
      ctx.abi->emit_outputs(ctx.abi, AC_LLVM_MAX_OUTPUTS, ctx.abi->outputs);

   free(ctx.ssa_defs);
   ralloc_free(ctx.defs);
   ralloc_free(ctx.phis);
   ralloc_free(ctx.vars);
   if (ctx.abi->kill_ps_if_inf_interp)
      ralloc_free(ctx.verified_interp);
}

bool ac_lower_indirect_derefs(struct nir_shader *nir, enum chip_class chip_class)
{
   bool progress = false;

   /* Lower large variables to scratch first so that we won't bloat the
    * shader by generating large if ladders for them. We later lower
    * scratch to alloca's, assuming LLVM won't generate VGPR indexing.
    */
   NIR_PASS(progress, nir, nir_lower_vars_to_scratch, nir_var_function_temp, 256,
            glsl_get_natural_size_align_bytes);

   /* While it would be nice not to have this flag, we are constrained
    * by the reality that LLVM 9.0 has buggy VGPR indexing on GFX9.
    */
   bool llvm_has_working_vgpr_indexing = chip_class != GFX9;

   /* TODO: Indirect indexing of GS inputs is unimplemented.
    *
    * TCS and TES load inputs directly from LDS or offchip memory, so
    * indirect indexing is trivial.
    */
   nir_variable_mode indirect_mask = 0;
   if (nir->info.stage == MESA_SHADER_GEOMETRY ||
       (nir->info.stage != MESA_SHADER_TESS_CTRL && nir->info.stage != MESA_SHADER_TESS_EVAL &&
        !llvm_has_working_vgpr_indexing)) {
      indirect_mask |= nir_var_shader_in;
   }
   if (!llvm_has_working_vgpr_indexing && nir->info.stage != MESA_SHADER_TESS_CTRL)
      indirect_mask |= nir_var_shader_out;

   /* TODO: We shouldn't need to do this, however LLVM isn't currently
    * smart enough to handle indirects without causing excess spilling
    * causing the gpu to hang.
    *
    * See the following thread for more details of the problem:
    * https://lists.freedesktop.org/archives/mesa-dev/2017-July/162106.html
    */
   indirect_mask |= nir_var_function_temp;

   progress |= nir_lower_indirect_derefs(nir, indirect_mask, UINT32_MAX);
   return progress;
}

static unsigned get_inst_tessfactor_writemask(nir_intrinsic_instr *intrin)
{
   if (intrin->intrinsic != nir_intrinsic_store_output)
      return 0;

   unsigned writemask = nir_intrinsic_write_mask(intrin) << nir_intrinsic_component(intrin);
   unsigned location = nir_intrinsic_io_semantics(intrin).location;

   if (location == VARYING_SLOT_TESS_LEVEL_OUTER)
      return writemask << 4;
   else if (location == VARYING_SLOT_TESS_LEVEL_INNER)
      return writemask;

   return 0;
}

static void scan_tess_ctrl(nir_cf_node *cf_node, unsigned *upper_block_tf_writemask,
                           unsigned *cond_block_tf_writemask,
                           bool *tessfactors_are_def_in_all_invocs, bool is_nested_cf)
{
   switch (cf_node->type) {
   case nir_cf_node_block: {
      nir_block *block = nir_cf_node_as_block(cf_node);
      nir_foreach_instr (instr, block) {
         if (instr->type != nir_instr_type_intrinsic)
            continue;

         nir_intrinsic_instr *intrin = nir_instr_as_intrinsic(instr);
         if (intrin->intrinsic == nir_intrinsic_control_barrier) {

            /* If we find a barrier in nested control flow put this in the
             * too hard basket. In GLSL this is not possible but it is in
             * SPIR-V.
             */
            if (is_nested_cf) {
               *tessfactors_are_def_in_all_invocs = false;
               return;
            }

            /* The following case must be prevented:
             *    gl_TessLevelInner = ...;
             *    barrier();
             *    if (gl_InvocationID == 1)
             *       gl_TessLevelInner = ...;
             *
             * If you consider disjoint code segments separated by barriers, each
             * such segment that writes tess factor channels should write the same
             * channels in all codepaths within that segment.
             */
            if (*upper_block_tf_writemask || *cond_block_tf_writemask) {
               /* Accumulate the result: */
               *tessfactors_are_def_in_all_invocs &=
                  !(*cond_block_tf_writemask & ~(*upper_block_tf_writemask));

               /* Analyze the next code segment from scratch. */
               *upper_block_tf_writemask = 0;
               *cond_block_tf_writemask = 0;
            }
         } else
            *upper_block_tf_writemask |= get_inst_tessfactor_writemask(intrin);
      }

      break;
   }
   case nir_cf_node_if: {
      unsigned then_tessfactor_writemask = 0;
      unsigned else_tessfactor_writemask = 0;

      nir_if *if_stmt = nir_cf_node_as_if(cf_node);
      foreach_list_typed(nir_cf_node, nested_node, node, &if_stmt->then_list)
      {
         scan_tess_ctrl(nested_node, &then_tessfactor_writemask, cond_block_tf_writemask,
                        tessfactors_are_def_in_all_invocs, true);
      }

      foreach_list_typed(nir_cf_node, nested_node, node, &if_stmt->else_list)
      {
         scan_tess_ctrl(nested_node, &else_tessfactor_writemask, cond_block_tf_writemask,
                        tessfactors_are_def_in_all_invocs, true);
      }

      if (then_tessfactor_writemask || else_tessfactor_writemask) {
         /* If both statements write the same tess factor channels,
          * we can say that the upper block writes them too.
          */
         *upper_block_tf_writemask |= then_tessfactor_writemask & else_tessfactor_writemask;
         *cond_block_tf_writemask |= then_tessfactor_writemask | else_tessfactor_writemask;
      }

      break;
   }
   case nir_cf_node_loop: {
      nir_loop *loop = nir_cf_node_as_loop(cf_node);
      foreach_list_typed(nir_cf_node, nested_node, node, &loop->body)
      {
         scan_tess_ctrl(nested_node, cond_block_tf_writemask, cond_block_tf_writemask,
                        tessfactors_are_def_in_all_invocs, true);
      }

      break;
   }
   default:
      unreachable("unknown cf node type");
   }
}

bool ac_are_tessfactors_def_in_all_invocs(const struct nir_shader *nir)
{
   assert(nir->info.stage == MESA_SHADER_TESS_CTRL);

   /* The pass works as follows:
    * If all codepaths write tess factors, we can say that all
    * invocations define tess factors.
    *
    * Each tess factor channel is tracked separately.
    */
   unsigned main_block_tf_writemask = 0; /* if main block writes tess factors */
   unsigned cond_block_tf_writemask = 0; /* if cond block writes tess factors */

   /* Initial value = true. Here the pass will accumulate results from
    * multiple segments surrounded by barriers. If tess factors aren't
    * written at all, it's a shader bug and we don't care if this will be
    * true.
    */
   bool tessfactors_are_def_in_all_invocs = true;

   nir_foreach_function (function, nir) {
      if (function->impl) {
         foreach_list_typed(nir_cf_node, node, node, &function->impl->body)
         {
            scan_tess_ctrl(node, &main_block_tf_writemask, &cond_block_tf_writemask,
                           &tessfactors_are_def_in_all_invocs, false);
         }
      }
   }

   /* Accumulate the result for the last code segment separated by a
    * barrier.
    */
   if (main_block_tf_writemask || cond_block_tf_writemask) {
      tessfactors_are_def_in_all_invocs &= !(cond_block_tf_writemask & ~main_block_tf_writemask);
   }

   return tessfactors_are_def_in_all_invocs;
}