diff options
Diffstat (limited to 'src/intel/compiler/brw_nir_intrinsics.c')
| -rw-r--r-- | src/intel/compiler/brw_nir_intrinsics.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/src/intel/compiler/brw_nir_intrinsics.c b/src/intel/compiler/brw_nir_intrinsics.c new file mode 100644 index 00000000000..901a1fb0ab9 --- /dev/null +++ b/src/intel/compiler/brw_nir_intrinsics.c @@ -0,0 +1,186 @@ +/* + * 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; +} |