src/compiler/nir/nir_lower_bool_to_bitsize.c - platform/external/mesa3d - Git at Google

 /*
  * Copyright © 2018 Intel Corporation
  *
  * 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 "nir.h"
 #include "nir_builder.h"

 static bool
 assert_ssa_def_is_not_1bit(nir_ssa_def *def, UNUSED void *unused)
 {
    assert(def->bit_size > 1);
    return true;
 }

 static bool
 rewrite_1bit_ssa_def_to_32bit(nir_ssa_def *def, void *_progress)
 {
    bool *progress = _progress;
    if (def->bit_size == 1) {
       def->bit_size = 32;
       *progress = true;
    }
    return true;
 }

 static uint32_t
 get_bool_convert_opcode(uint32_t dst_bit_size)
 {
    switch (dst_bit_size) {
    case 32: return nir_op_i2i32;
    case 16: return nir_op_i2i16;
    case 8:  return nir_op_i2i8;
    default:
       unreachable("invalid boolean bit-size");
    }
 }

 static void
 make_sources_canonical(nir_builder *b, nir_alu_instr *alu, uint32_t start_idx)
 {
    /* TODO: for now we take the bit-size of the first source as the canonical
     * form but we could try to be smarter.
     */
    const nir_op_info *op_info = &nir_op_infos[alu->op];
    uint32_t bit_size = nir_src_bit_size(alu->src[start_idx].src);
    for (uint32_t i = start_idx + 1; i < op_info->num_inputs; i++) {
       if (nir_src_bit_size(alu->src[i].src) != bit_size) {
          b->cursor = nir_before_instr(&alu->instr);
          nir_op convert_op = get_bool_convert_opcode(bit_size);
          nir_ssa_def *new_src =
             nir_build_alu(b, convert_op, alu->src[i].src.ssa, NULL, NULL, NULL);
          /* Retain the write mask and swizzle of the original instruction so
           * that we don’t unnecessarily create a vectorized instruction.
           */
          nir_alu_instr *conv_instr =
             nir_instr_as_alu(nir_builder_last_instr(b));
          conv_instr->dest.write_mask = alu->dest.write_mask;
          conv_instr->dest.dest.ssa.num_components =
             alu->dest.dest.ssa.num_components;
          memcpy(conv_instr->src[0].swizzle,
                 alu->src[i].swizzle,
                 sizeof(conv_instr->src[0].swizzle));
          nir_instr_rewrite_src(&alu->instr,
                                &alu->src[i].src, nir_src_for_ssa(new_src));
          /* The swizzle will have been handled by the conversion instruction
           * so we can reset it back to the default
           */
          for (unsigned j = 0; j < NIR_MAX_VEC_COMPONENTS; j++)
             alu->src[i].swizzle[j] = j;
       }
    }
 }

 static bool
 lower_alu_instr(nir_builder *b, nir_alu_instr *alu)
 {
    const nir_op_info *op_info = &nir_op_infos[alu->op];

    /* For operations that can take multiple boolean sources we need to ensure
     * that all booleans have the same bit-size
     */
    switch (alu->op) {
    case nir_op_mov:
    case nir_op_vec2:
    case nir_op_vec3:
    case nir_op_vec4:
    case nir_op_vec8:
    case nir_op_vec16:
    case nir_op_inot:
    case nir_op_iand:
    case nir_op_ior:
    case nir_op_ixor:
       if (nir_dest_bit_size(alu->dest.dest) > 1)
          break; /* Not a boolean instruction */
       /* Fallthrough */

    case nir_op_ball_fequal2:
    case nir_op_ball_fequal3:
    case nir_op_ball_fequal4:
    case nir_op_bany_fnequal2:
    case nir_op_bany_fnequal3:
    case nir_op_bany_fnequal4:
    case nir_op_ball_iequal2:
    case nir_op_ball_iequal3:
    case nir_op_ball_iequal4:
    case nir_op_bany_inequal2:
    case nir_op_bany_inequal3:
    case nir_op_bany_inequal4:
    case nir_op_ieq:
    case nir_op_ine:
       make_sources_canonical(b, alu, 0);
       break;

    case nir_op_bcsel:
       /* bcsel may be choosing between boolean sources too */
       if (nir_dest_bit_size(alu->dest.dest) == 1)
          make_sources_canonical(b, alu, 1);
       break;

    default:
       break;
    }

    /* Now that we have a canonical boolean bit-size, go on and rewrite the
     * instruction to match the canonical bit-size.
     */
    uint32_t bit_size = nir_src_bit_size(alu->src[0].src);
    assert(bit_size > 1);

    nir_op opcode = alu->op;
    switch (opcode) {
    case nir_op_mov:
    case nir_op_vec2:
    case nir_op_vec3:
    case nir_op_vec4:
    case nir_op_vec8:
    case nir_op_vec16:
    case nir_op_inot:
    case nir_op_iand:
    case nir_op_ior:
    case nir_op_ixor:
       /* Nothing to do here, we do not specialize these opcodes by bit-size */
       break;

    case nir_op_f2b1:
       opcode = bit_size == 8 ? nir_op_f2b8 :
                                bit_size == 16 ? nir_op_f2b16 : nir_op_f2b32;
       break;

    case nir_op_i2b1:
       opcode = bit_size == 8 ? nir_op_i2b8 :
                                bit_size == 16 ? nir_op_i2b16 : nir_op_i2b32;
       break;

    case nir_op_b2b1:
       /* Since the canonical bit size is the size of the src, it's a no-op */
       opcode = nir_op_mov;
       break;

    case nir_op_b2b32:
       /* For up-converting booleans, sign-extend */
       opcode = nir_op_i2i32;
       break;

    case nir_op_flt:
       opcode = bit_size == 8 ? nir_op_flt8 :
                                bit_size == 16 ? nir_op_flt16 : nir_op_flt32;
       break;

    case nir_op_fge:
       opcode = bit_size == 8 ? nir_op_fge8 :
                                bit_size == 16 ? nir_op_fge16 : nir_op_fge32;
       break;

    case nir_op_feq:
       opcode = bit_size == 8 ? nir_op_feq8 :
                                bit_size == 16 ? nir_op_feq16 : nir_op_feq32;
       break;

    case nir_op_fne:
       opcode = bit_size == 8 ? nir_op_fne8 :
                                bit_size == 16 ? nir_op_fne16 : nir_op_fne32;
       break;

    case nir_op_ilt:
       opcode = bit_size == 8 ? nir_op_ilt8 :
                                bit_size == 16 ? nir_op_ilt16 : nir_op_ilt32;
       break;

    case nir_op_ige:
       opcode = bit_size == 8 ? nir_op_ige8 :
                                bit_size == 16 ? nir_op_ige16 : nir_op_ige32;
       break;

    case nir_op_ieq:
       opcode = bit_size == 8 ? nir_op_ieq8 :
                                bit_size == 16 ? nir_op_ieq16 : nir_op_ieq32;
       break;

    case nir_op_ine:
       opcode = bit_size == 8 ? nir_op_ine8 :
                                bit_size == 16 ? nir_op_ine16 : nir_op_ine32;
       break;

    case nir_op_ult:
       opcode = bit_size == 8 ? nir_op_ult8 :
                                bit_size == 16 ? nir_op_ult16 : nir_op_ult32;
       break;

    case nir_op_uge:
       opcode = bit_size == 8 ? nir_op_uge8 :
                                bit_size == 16 ? nir_op_uge16 : nir_op_uge32;
       break;

    case nir_op_ball_fequal2:
       opcode = bit_size == 8 ? nir_op_b8all_fequal2 :
                                bit_size == 16 ? nir_op_b16all_fequal2 :
                                                 nir_op_b32all_fequal2;
       break;

    case nir_op_ball_fequal3:
       opcode = bit_size == 8 ? nir_op_b8all_fequal3 :
                                bit_size == 16 ? nir_op_b16all_fequal3 :
                                                 nir_op_b32all_fequal3;
       break;

    case nir_op_ball_fequal4:
       opcode = bit_size == 8 ? nir_op_b8all_fequal4 :
                                bit_size == 16 ? nir_op_b16all_fequal4 :
                                                 nir_op_b32all_fequal4;
       break;

    case nir_op_bany_fnequal2:
       opcode = bit_size == 8 ? nir_op_b8any_fnequal2 :
                                bit_size == 16 ? nir_op_b16any_fnequal2 :
                                                 nir_op_b32any_fnequal2;
       break;

    case nir_op_bany_fnequal3:
       opcode = bit_size == 8 ? nir_op_b8any_fnequal3 :
                                bit_size == 16 ? nir_op_b16any_fnequal3 :
                                                 nir_op_b32any_fnequal3;
       break;

    case nir_op_bany_fnequal4:
       opcode = bit_size == 8 ? nir_op_b8any_fnequal4 :
                                bit_size == 16 ? nir_op_b16any_fnequal4 :
                                                 nir_op_b32any_fnequal4;
       break;

    case nir_op_ball_iequal2:
       opcode = bit_size == 8 ? nir_op_b8all_iequal2 :
                                bit_size == 16 ? nir_op_b16all_iequal2 :
                                                 nir_op_b32all_iequal2;
       break;

    case nir_op_ball_iequal3:
       opcode = bit_size == 8 ? nir_op_b8all_iequal3 :
                                bit_size == 16 ? nir_op_b16all_iequal3 :
                                                 nir_op_b32all_iequal3;
       break;

    case nir_op_ball_iequal4:
       opcode = bit_size == 8 ? nir_op_b8all_iequal4 :
                                bit_size == 16 ? nir_op_b16all_iequal4 :
                                                 nir_op_b32all_iequal4;
       break;

    case nir_op_bany_inequal2:
       opcode = bit_size == 8 ? nir_op_b8any_inequal2 :
                                bit_size == 16 ? nir_op_b16any_inequal2 :
                                                 nir_op_b32any_inequal2;
       break;

    case nir_op_bany_inequal3:
       opcode = bit_size == 8 ? nir_op_b8any_inequal3 :
                                bit_size == 16 ? nir_op_b16any_inequal3 :
                                                 nir_op_b32any_inequal3;
       break;

    case nir_op_bany_inequal4:
       opcode = bit_size == 8 ? nir_op_b8any_inequal4 :
                                bit_size == 16 ? nir_op_b16any_inequal4 :
                                                 nir_op_b32any_inequal4;
       break;

    case nir_op_bcsel:
       opcode = bit_size == 8 ? nir_op_b8csel :
                                bit_size == 16 ? nir_op_b16csel : nir_op_b32csel;

       /* The destination of the selection may have a different bit-size from
        * the bcsel condition.
        */
       bit_size = nir_src_bit_size(alu->src[1].src);
       break;

    default:
       assert(alu->dest.dest.ssa.bit_size > 1);
       for (unsigned i = 0; i < op_info->num_inputs; i++)
          assert(alu->src[i].src.ssa->bit_size > 1);
       return false;
    }

    alu->op = opcode;

    if (alu->dest.dest.ssa.bit_size == 1)
       alu->dest.dest.ssa.bit_size = bit_size;

    return true;
 }

 static bool
 lower_load_const_instr(nir_load_const_instr *load)
 {
    bool progress = false;

    if (load->def.bit_size > 1)
       return progress;

    /* TODO: It is not clear if there is any case in which we can ever hit
     * this path, so for now we just provide a 32-bit default.
     *
     * TODO2: after some changed on nir_const_value and other on upstream, we
     * removed the initialization of a general value like this:
     *   nir_const_value value = load->value
     *
     * to initialize per value component. Need to confirm if that is correct,
     * but look at the TOO before.
     */
    for (unsigned i = 0; i < load->def.num_components; i++) {
       load->value[i].u32 = load->value[i].b ? NIR_TRUE : NIR_FALSE;
       load->def.bit_size = 32;
       progress = true;
    }

    return progress;
 }

 static bool
 lower_phi_instr(nir_builder *b, nir_phi_instr *phi)
 {
    if (nir_dest_bit_size(phi->dest) != 1)
       return false;

    /* Ensure all phi sources have a canonical bit-size. We choose the
     * bit-size of the first phi source as the canonical form.
     *
     * TODO: maybe we can be smarter about how we choose the canonical form.
     */
    uint32_t dst_bit_size = 0;
    nir_foreach_phi_src(phi_src, phi) {
       uint32_t src_bit_size = nir_src_bit_size(phi_src->src);
       if (dst_bit_size == 0) {
          dst_bit_size = src_bit_size;
       } else if (src_bit_size != dst_bit_size) {
          assert(phi_src->src.is_ssa);
          b->cursor = nir_before_src(&phi_src->src, false);
          nir_op convert_op = get_bool_convert_opcode(dst_bit_size);
          nir_ssa_def *new_src =
             nir_build_alu(b, convert_op, phi_src->src.ssa, NULL, NULL, NULL);
          nir_instr_rewrite_src(&phi->instr, &phi_src->src,
                                nir_src_for_ssa(new_src));
       }
    }

    phi->dest.ssa.bit_size = dst_bit_size;

    return true;
 }

 static bool
 nir_lower_bool_to_bitsize_impl(nir_builder *b, nir_function_impl *impl)
 {
    bool progress = false;

    nir_foreach_block(block, impl) {
       nir_foreach_instr_safe(instr, block) {
          switch (instr->type) {
          case nir_instr_type_alu:
             progress |= lower_alu_instr(b, nir_instr_as_alu(instr));
             break;

          case nir_instr_type_load_const:
             progress |= lower_load_const_instr(nir_instr_as_load_const(instr));
             break;

          case nir_instr_type_phi:
             progress |= lower_phi_instr(b, nir_instr_as_phi(instr));
             break;

          case nir_instr_type_ssa_undef:
          case nir_instr_type_intrinsic:
          case nir_instr_type_tex:
             nir_foreach_ssa_def(instr, rewrite_1bit_ssa_def_to_32bit,
                                 &progress);
             break;

          default:
             nir_foreach_ssa_def(instr, assert_ssa_def_is_not_1bit, NULL);
          }
       }
    }

    if (progress) {
       nir_metadata_preserve(impl, nir_metadata_block_index |
                                   nir_metadata_dominance);
    }

    return progress;
 }

 bool
 nir_lower_bool_to_bitsize(nir_shader *shader)
 {
    nir_builder b;
    bool progress = false;

    nir_foreach_function(function, shader) {
       if (function->impl) {
          nir_builder_init(&b, function->impl);
          progress = nir_lower_bool_to_bitsize_impl(&b, function->impl) || progress;
       }
    }

    return progress;
 }
	/*
	* Copyright © 2018 Intel Corporation
	*
	* 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 "nir.h"
	#include "nir_builder.h"

	static bool
	assert_ssa_def_is_not_1bit(nir_ssa_def def, UNUSED void unused)
	{
	assert(def->bit_size > 1);
	return true;
	}

	static bool
	rewrite_1bit_ssa_def_to_32bit(nir_ssa_def def, void _progress)
	{
	bool *progress = _progress;
	if (def->bit_size == 1) {
	def->bit_size = 32;
	*progress = true;
	}
	return true;
	}

	static uint32_t
	get_bool_convert_opcode(uint32_t dst_bit_size)
	{
	switch (dst_bit_size) {
	case 32: return nir_op_i2i32;
	case 16: return nir_op_i2i16;
	case 8: return nir_op_i2i8;
	default:
	unreachable("invalid boolean bit-size");
	}
	}

	static void
	make_sources_canonical(nir_builder b, nir_alu_instr alu, uint32_t start_idx)
	{
	/* TODO: for now we take the bit-size of the first source as the canonical
	* form but we could try to be smarter.
	*/
	const nir_op_info *op_info = &nir_op_infos[alu->op];
	uint32_t bit_size = nir_src_bit_size(alu->src[start_idx].src);
	for (uint32_t i = start_idx + 1; i < op_info->num_inputs; i++) {
	if (nir_src_bit_size(alu->src[i].src) != bit_size) {
	b->cursor = nir_before_instr(&alu->instr);
	nir_op convert_op = get_bool_convert_opcode(bit_size);
	nir_ssa_def *new_src =
	nir_build_alu(b, convert_op, alu->src[i].src.ssa, NULL, NULL, NULL);
	/* Retain the write mask and swizzle of the original instruction so
	* that we don’t unnecessarily create a vectorized instruction.
	*/
	nir_alu_instr *conv_instr =
	nir_instr_as_alu(nir_builder_last_instr(b));
	conv_instr->dest.write_mask = alu->dest.write_mask;
	conv_instr->dest.dest.ssa.num_components =
	alu->dest.dest.ssa.num_components;
	memcpy(conv_instr->src[0].swizzle,
	alu->src[i].swizzle,
	sizeof(conv_instr->src[0].swizzle));
	nir_instr_rewrite_src(&alu->instr,
	&alu->src[i].src, nir_src_for_ssa(new_src));
	/* The swizzle will have been handled by the conversion instruction
	* so we can reset it back to the default
	*/
	for (unsigned j = 0; j < NIR_MAX_VEC_COMPONENTS; j++)
	alu->src[i].swizzle[j] = j;
	}
	}
	}

	static bool
	lower_alu_instr(nir_builder b, nir_alu_instr alu)
	{
	const nir_op_info *op_info = &nir_op_infos[alu->op];

	/* For operations that can take multiple boolean sources we need to ensure
	* that all booleans have the same bit-size
	*/
	switch (alu->op) {
	case nir_op_mov:
	case nir_op_vec2:
	case nir_op_vec3:
	case nir_op_vec4:
	case nir_op_vec8:
	case nir_op_vec16:
	case nir_op_inot:
	case nir_op_iand:
	case nir_op_ior:
	case nir_op_ixor:
	if (nir_dest_bit_size(alu->dest.dest) > 1)
	break; /* Not a boolean instruction */
	/* Fallthrough */

	case nir_op_ball_fequal2:
	case nir_op_ball_fequal3:
	case nir_op_ball_fequal4:
	case nir_op_bany_fnequal2:
	case nir_op_bany_fnequal3:
	case nir_op_bany_fnequal4:
	case nir_op_ball_iequal2:
	case nir_op_ball_iequal3:
	case nir_op_ball_iequal4:
	case nir_op_bany_inequal2:
	case nir_op_bany_inequal3:
	case nir_op_bany_inequal4:
	case nir_op_ieq:
	case nir_op_ine:
	make_sources_canonical(b, alu, 0);
	break;

	case nir_op_bcsel:
	/* bcsel may be choosing between boolean sources too */
	if (nir_dest_bit_size(alu->dest.dest) == 1)
	make_sources_canonical(b, alu, 1);
	break;

	default:
	break;
	}

	/* Now that we have a canonical boolean bit-size, go on and rewrite the
	* instruction to match the canonical bit-size.
	*/
	uint32_t bit_size = nir_src_bit_size(alu->src[0].src);
	assert(bit_size > 1);

	nir_op opcode = alu->op;
	switch (opcode) {
	case nir_op_mov:
	case nir_op_vec2:
	case nir_op_vec3:
	case nir_op_vec4:
	case nir_op_vec8:
	case nir_op_vec16:
	case nir_op_inot:
	case nir_op_iand:
	case nir_op_ior:
	case nir_op_ixor:
	/* Nothing to do here, we do not specialize these opcodes by bit-size */
	break;

	case nir_op_f2b1:
	opcode = bit_size == 8 ? nir_op_f2b8 :
	bit_size == 16 ? nir_op_f2b16 : nir_op_f2b32;
	break;

	case nir_op_i2b1:
	opcode = bit_size == 8 ? nir_op_i2b8 :
	bit_size == 16 ? nir_op_i2b16 : nir_op_i2b32;
	break;

	case nir_op_b2b1:
	/* Since the canonical bit size is the size of the src, it's a no-op */
	opcode = nir_op_mov;
	break;

	case nir_op_b2b32:
	/* For up-converting booleans, sign-extend */
	opcode = nir_op_i2i32;
	break;

	case nir_op_flt:
	opcode = bit_size == 8 ? nir_op_flt8 :
	bit_size == 16 ? nir_op_flt16 : nir_op_flt32;
	break;

	case nir_op_fge:
	opcode = bit_size == 8 ? nir_op_fge8 :
	bit_size == 16 ? nir_op_fge16 : nir_op_fge32;
	break;

	case nir_op_feq:
	opcode = bit_size == 8 ? nir_op_feq8 :
	bit_size == 16 ? nir_op_feq16 : nir_op_feq32;
	break;

	case nir_op_fne:
	opcode = bit_size == 8 ? nir_op_fne8 :
	bit_size == 16 ? nir_op_fne16 : nir_op_fne32;
	break;

	case nir_op_ilt:
	opcode = bit_size == 8 ? nir_op_ilt8 :
	bit_size == 16 ? nir_op_ilt16 : nir_op_ilt32;
	break;

	case nir_op_ige:
	opcode = bit_size == 8 ? nir_op_ige8 :
	bit_size == 16 ? nir_op_ige16 : nir_op_ige32;
	break;

	case nir_op_ieq:
	opcode = bit_size == 8 ? nir_op_ieq8 :
	bit_size == 16 ? nir_op_ieq16 : nir_op_ieq32;
	break;

	case nir_op_ine:
	opcode = bit_size == 8 ? nir_op_ine8 :
	bit_size == 16 ? nir_op_ine16 : nir_op_ine32;
	break;

	case nir_op_ult:
	opcode = bit_size == 8 ? nir_op_ult8 :
	bit_size == 16 ? nir_op_ult16 : nir_op_ult32;
	break;

	case nir_op_uge:
	opcode = bit_size == 8 ? nir_op_uge8 :
	bit_size == 16 ? nir_op_uge16 : nir_op_uge32;
	break;

	case nir_op_ball_fequal2:
	opcode = bit_size == 8 ? nir_op_b8all_fequal2 :
	bit_size == 16 ? nir_op_b16all_fequal2 :
	nir_op_b32all_fequal2;
	break;

	case nir_op_ball_fequal3:
	opcode = bit_size == 8 ? nir_op_b8all_fequal3 :
	bit_size == 16 ? nir_op_b16all_fequal3 :
	nir_op_b32all_fequal3;
	break;

	case nir_op_ball_fequal4:
	opcode = bit_size == 8 ? nir_op_b8all_fequal4 :
	bit_size == 16 ? nir_op_b16all_fequal4 :
	nir_op_b32all_fequal4;
	break;

	case nir_op_bany_fnequal2:
	opcode = bit_size == 8 ? nir_op_b8any_fnequal2 :
	bit_size == 16 ? nir_op_b16any_fnequal2 :
	nir_op_b32any_fnequal2;
	break;

	case nir_op_bany_fnequal3:
	opcode = bit_size == 8 ? nir_op_b8any_fnequal3 :
	bit_size == 16 ? nir_op_b16any_fnequal3 :
	nir_op_b32any_fnequal3;
	break;

	case nir_op_bany_fnequal4:
	opcode = bit_size == 8 ? nir_op_b8any_fnequal4 :
	bit_size == 16 ? nir_op_b16any_fnequal4 :
	nir_op_b32any_fnequal4;
	break;

	case nir_op_ball_iequal2:
	opcode = bit_size == 8 ? nir_op_b8all_iequal2 :
	bit_size == 16 ? nir_op_b16all_iequal2 :
	nir_op_b32all_iequal2;
	break;

	case nir_op_ball_iequal3:
	opcode = bit_size == 8 ? nir_op_b8all_iequal3 :
	bit_size == 16 ? nir_op_b16all_iequal3 :
	nir_op_b32all_iequal3;
	break;

	case nir_op_ball_iequal4:
	opcode = bit_size == 8 ? nir_op_b8all_iequal4 :
	bit_size == 16 ? nir_op_b16all_iequal4 :
	nir_op_b32all_iequal4;
	break;

	case nir_op_bany_inequal2:
	opcode = bit_size == 8 ? nir_op_b8any_inequal2 :
	bit_size == 16 ? nir_op_b16any_inequal2 :
	nir_op_b32any_inequal2;
	break;

	case nir_op_bany_inequal3:
	opcode = bit_size == 8 ? nir_op_b8any_inequal3 :
	bit_size == 16 ? nir_op_b16any_inequal3 :
	nir_op_b32any_inequal3;
	break;

	case nir_op_bany_inequal4:
	opcode = bit_size == 8 ? nir_op_b8any_inequal4 :
	bit_size == 16 ? nir_op_b16any_inequal4 :
	nir_op_b32any_inequal4;
	break;

	case nir_op_bcsel:
	opcode = bit_size == 8 ? nir_op_b8csel :
	bit_size == 16 ? nir_op_b16csel : nir_op_b32csel;

	/* The destination of the selection may have a different bit-size from
	* the bcsel condition.
	*/
	bit_size = nir_src_bit_size(alu->src[1].src);
	break;

	default:
	assert(alu->dest.dest.ssa.bit_size > 1);
	for (unsigned i = 0; i < op_info->num_inputs; i++)
	assert(alu->src[i].src.ssa->bit_size > 1);
	return false;
	}

	alu->op = opcode;

	if (alu->dest.dest.ssa.bit_size == 1)
	alu->dest.dest.ssa.bit_size = bit_size;

	return true;
	}

	static bool
	lower_load_const_instr(nir_load_const_instr *load)
	{
	bool progress = false;

	if (load->def.bit_size > 1)
	return progress;

	/* TODO: It is not clear if there is any case in which we can ever hit
	* this path, so for now we just provide a 32-bit default.
	*
	* TODO2: after some changed on nir_const_value and other on upstream, we
	* removed the initialization of a general value like this:
	* nir_const_value value = load->value
	*
	* to initialize per value component. Need to confirm if that is correct,
	* but look at the TOO before.
	*/
	for (unsigned i = 0; i < load->def.num_components; i++) {
	load->value[i].u32 = load->value[i].b ? NIR_TRUE : NIR_FALSE;
	load->def.bit_size = 32;
	progress = true;
	}

	return progress;
	}

	static bool
	lower_phi_instr(nir_builder b, nir_phi_instr phi)
	{
	if (nir_dest_bit_size(phi->dest) != 1)
	return false;

	/* Ensure all phi sources have a canonical bit-size. We choose the
	* bit-size of the first phi source as the canonical form.
	*
	* TODO: maybe we can be smarter about how we choose the canonical form.
	*/
	uint32_t dst_bit_size = 0;
	nir_foreach_phi_src(phi_src, phi) {
	uint32_t src_bit_size = nir_src_bit_size(phi_src->src);
	if (dst_bit_size == 0) {
	dst_bit_size = src_bit_size;
	} else if (src_bit_size != dst_bit_size) {
	assert(phi_src->src.is_ssa);
	b->cursor = nir_before_src(&phi_src->src, false);
	nir_op convert_op = get_bool_convert_opcode(dst_bit_size);
	nir_ssa_def *new_src =
	nir_build_alu(b, convert_op, phi_src->src.ssa, NULL, NULL, NULL);
	nir_instr_rewrite_src(&phi->instr, &phi_src->src,
	nir_src_for_ssa(new_src));
	}
	}

	phi->dest.ssa.bit_size = dst_bit_size;

	return true;
	}

	static bool
	nir_lower_bool_to_bitsize_impl(nir_builder b, nir_function_impl impl)
	{
	bool progress = false;

	nir_foreach_block(block, impl) {
	nir_foreach_instr_safe(instr, block) {
	switch (instr->type) {
	case nir_instr_type_alu:
	progress \|= lower_alu_instr(b, nir_instr_as_alu(instr));
	break;

	case nir_instr_type_load_const:
	progress \|= lower_load_const_instr(nir_instr_as_load_const(instr));
	break;

	case nir_instr_type_phi:
	progress \|= lower_phi_instr(b, nir_instr_as_phi(instr));
	break;

	case nir_instr_type_ssa_undef:
	case nir_instr_type_intrinsic:
	case nir_instr_type_tex:
	nir_foreach_ssa_def(instr, rewrite_1bit_ssa_def_to_32bit,
	&progress);
	break;

	default:
	nir_foreach_ssa_def(instr, assert_ssa_def_is_not_1bit, NULL);
	}
	}
	}

	if (progress) {
	nir_metadata_preserve(impl, nir_metadata_block_index \|
	nir_metadata_dominance);
	}

	return progress;
	}

	bool
	nir_lower_bool_to_bitsize(nir_shader *shader)
	{
	nir_builder b;
	bool progress = false;

	nir_foreach_function(function, shader) {
	if (function->impl) {
	nir_builder_init(&b, function->impl);
	progress = nir_lower_bool_to_bitsize_impl(&b, function->impl) \|\| progress;
	}
	}

	return progress;
	}