| /* |
| * Copyright (c) 2016 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 "brw_nir.h" |
| #include "compiler/nir/nir_builder.h" |
| |
| struct lower_intrinsics_state { |
| nir_shader *nir; |
| union { |
| struct brw_stage_prog_data *prog_data; |
| struct brw_cs_prog_data *cs_prog_data; |
| }; |
| nir_function_impl *impl; |
| bool progress; |
| nir_builder builder; |
| bool cs_thread_id_used; |
| }; |
| |
| static nir_ssa_def * |
| read_thread_local_id(struct lower_intrinsics_state *state) |
| { |
| nir_builder *b = &state->builder; |
| nir_shader *nir = state->nir; |
| const unsigned *sizes = nir->info->cs.local_size; |
| const unsigned group_size = sizes[0] * sizes[1] * sizes[2]; |
| |
| /* Some programs have local_size dimensions so small that the thread local |
| * ID will always be 0. |
| */ |
| if (group_size <= 8) |
| return nir_imm_int(b, 0); |
| |
| assert(state->cs_prog_data->thread_local_id_index >= 0); |
| state->cs_thread_id_used = true; |
| const int id_index = state->cs_prog_data->thread_local_id_index; |
| |
| nir_intrinsic_instr *load = |
| nir_intrinsic_instr_create(nir, nir_intrinsic_load_uniform); |
| load->num_components = 1; |
| load->src[0] = nir_src_for_ssa(nir_imm_int(b, 0)); |
| nir_ssa_dest_init(&load->instr, &load->dest, 1, 32, NULL); |
| nir_intrinsic_set_base(load, id_index * sizeof(uint32_t)); |
| nir_intrinsic_set_range(load, sizeof(uint32_t)); |
| nir_builder_instr_insert(b, &load->instr); |
| return &load->dest.ssa; |
| } |
| |
| static bool |
| lower_cs_intrinsics_convert_block(struct lower_intrinsics_state *state, |
| nir_block *block) |
| { |
| bool progress = false; |
| nir_builder *b = &state->builder; |
| nir_shader *nir = state->nir; |
| |
| nir_foreach_instr_safe(instr, block) { |
| if (instr->type != nir_instr_type_intrinsic) |
| continue; |
| |
| nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr); |
| |
| b->cursor = nir_after_instr(&intrinsic->instr); |
| |
| nir_ssa_def *sysval; |
| switch (intrinsic->intrinsic) { |
| case nir_intrinsic_load_local_invocation_index: { |
| assert(nir->stage == MESA_SHADER_COMPUTE); |
| /* We construct the local invocation index from: |
| * |
| * gl_LocalInvocationIndex = |
| * cs_thread_local_id + channel_num; |
| */ |
| nir_ssa_def *thread_local_id = read_thread_local_id(state); |
| nir_ssa_def *channel = nir_load_channel_num(b); |
| sysval = nir_iadd(b, channel, thread_local_id); |
| break; |
| } |
| |
| case nir_intrinsic_load_local_invocation_id: { |
| assert(nir->stage == MESA_SHADER_COMPUTE); |
| /* We lower gl_LocalInvocationID from gl_LocalInvocationIndex based |
| * on this formula: |
| * |
| * gl_LocalInvocationID.x = |
| * gl_LocalInvocationIndex % gl_WorkGroupSize.x; |
| * gl_LocalInvocationID.y = |
| * (gl_LocalInvocationIndex / gl_WorkGroupSize.x) % |
| * gl_WorkGroupSize.y; |
| * gl_LocalInvocationID.z = |
| * (gl_LocalInvocationIndex / |
| * (gl_WorkGroupSize.x * gl_WorkGroupSize.y)) % |
| * gl_WorkGroupSize.z; |
| */ |
| unsigned *size = nir->info->cs.local_size; |
| |
| nir_ssa_def *local_index = nir_load_local_invocation_index(b); |
| |
| nir_const_value uvec3; |
| uvec3.u32[0] = 1; |
| uvec3.u32[1] = size[0]; |
| uvec3.u32[2] = size[0] * size[1]; |
| nir_ssa_def *div_val = nir_build_imm(b, 3, 32, uvec3); |
| uvec3.u32[0] = size[0]; |
| uvec3.u32[1] = size[1]; |
| uvec3.u32[2] = size[2]; |
| nir_ssa_def *mod_val = nir_build_imm(b, 3, 32, uvec3); |
| |
| sysval = nir_umod(b, nir_udiv(b, local_index, div_val), mod_val); |
| break; |
| } |
| |
| default: |
| continue; |
| } |
| |
| nir_ssa_def_rewrite_uses(&intrinsic->dest.ssa, nir_src_for_ssa(sysval)); |
| nir_instr_remove(&intrinsic->instr); |
| |
| state->progress = true; |
| } |
| |
| return progress; |
| } |
| |
| static void |
| lower_cs_intrinsics_convert_impl(struct lower_intrinsics_state *state) |
| { |
| nir_builder_init(&state->builder, state->impl); |
| |
| nir_foreach_block(block, state->impl) { |
| lower_cs_intrinsics_convert_block(state, block); |
| } |
| |
| nir_metadata_preserve(state->impl, |
| nir_metadata_block_index | nir_metadata_dominance); |
| } |
| |
| bool |
| brw_nir_lower_intrinsics(nir_shader *nir, struct brw_stage_prog_data *prog_data) |
| { |
| /* Currently we only lower intrinsics for compute shaders */ |
| if (nir->stage != MESA_SHADER_COMPUTE) |
| return false; |
| |
| bool progress = false; |
| struct lower_intrinsics_state state; |
| memset(&state, 0, sizeof(state)); |
| state.nir = nir; |
| state.prog_data = prog_data; |
| |
| do { |
| state.progress = false; |
| nir_foreach_function(function, nir) { |
| if (function->impl) { |
| state.impl = function->impl; |
| lower_cs_intrinsics_convert_impl(&state); |
| } |
| } |
| progress |= state.progress; |
| } while (state.progress); |
| |
| if (nir->stage == MESA_SHADER_COMPUTE && !state.cs_thread_id_used) |
| state.cs_prog_data->thread_local_id_index = -1; |
| |
| return progress; |
| } |