brw_nir_intrinsics.c revision 0a3acff5b53d409181dcd2f31a4a50af06f73a57
1/* 2 * Copyright (c) 2016 Intel Corporation 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice (including the next 12 * paragraph) shall be included in all copies or substantial portions of the 13 * Software. 14 * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 21 * IN THE SOFTWARE. 22 */ 23 24#include "brw_nir.h" 25#include "compiler/nir/nir_builder.h" 26 27struct lower_intrinsics_state { 28 nir_shader *nir; 29 union { 30 struct brw_stage_prog_data *prog_data; 31 struct brw_cs_prog_data *cs_prog_data; 32 }; 33 nir_function_impl *impl; 34 bool progress; 35 nir_builder builder; 36 bool cs_thread_id_used; 37}; 38 39static nir_ssa_def * 40read_thread_local_id(struct lower_intrinsics_state *state) 41{ 42 assert(state->cs_prog_data->thread_local_id_index >= 0); 43 state->cs_thread_id_used = true; 44 const int id_index = state->cs_prog_data->thread_local_id_index; 45 46 nir_builder *b = &state->builder; 47 nir_shader *nir = state->nir; 48 nir_intrinsic_instr *load = 49 nir_intrinsic_instr_create(nir, nir_intrinsic_load_uniform); 50 load->num_components = 1; 51 load->src[0] = nir_src_for_ssa(nir_imm_int(b, 0)); 52 nir_ssa_dest_init(&load->instr, &load->dest, 1, 32, NULL); 53 nir_intrinsic_set_base(load, id_index * sizeof(uint32_t)); 54 nir_intrinsic_set_range(load, sizeof(uint32_t)); 55 nir_builder_instr_insert(b, &load->instr); 56 return &load->dest.ssa; 57} 58 59static bool 60lower_cs_intrinsics_convert_block(struct lower_intrinsics_state *state, 61 nir_block *block) 62{ 63 bool progress = false; 64 nir_builder *b = &state->builder; 65 nir_shader *nir = state->nir; 66 67 nir_foreach_instr_safe(instr, block) { 68 if (instr->type != nir_instr_type_intrinsic) 69 continue; 70 71 nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr); 72 73 b->cursor = nir_after_instr(&intrinsic->instr); 74 75 nir_ssa_def *sysval; 76 switch (intrinsic->intrinsic) { 77 case nir_intrinsic_load_local_invocation_index: { 78 assert(nir->stage == MESA_SHADER_COMPUTE); 79 /* We construct the local invocation index from: 80 * 81 * gl_LocalInvocationIndex = 82 * cs_thread_local_id + channel_num; 83 */ 84 nir_ssa_def *thread_local_id = read_thread_local_id(state); 85 nir_ssa_def *channel = 86 nir_load_system_value(b, nir_intrinsic_load_channel_num, 0); 87 sysval = nir_iadd(b, channel, thread_local_id); 88 break; 89 } 90 91 case nir_intrinsic_load_local_invocation_id: { 92 assert(nir->stage == MESA_SHADER_COMPUTE); 93 /* We lower gl_LocalInvocationID from gl_LocalInvocationIndex based 94 * on this formula: 95 * 96 * gl_LocalInvocationID.x = 97 * gl_LocalInvocationIndex % gl_WorkGroupSize.x; 98 * gl_LocalInvocationID.y = 99 * (gl_LocalInvocationIndex / gl_WorkGroupSize.x) % 100 * gl_WorkGroupSize.y; 101 * gl_LocalInvocationID.z = 102 * (gl_LocalInvocationIndex / 103 * (gl_WorkGroupSize.x * gl_WorkGroupSize.y)) % 104 * gl_WorkGroupSize.z; 105 */ 106 unsigned *size = nir->info.cs.local_size; 107 108 nir_ssa_def *local_index = 109 nir_load_system_value(b, nir_intrinsic_load_local_invocation_index, 0); 110 111 nir_const_value uvec3; 112 uvec3.u32[0] = 1; 113 uvec3.u32[1] = size[0]; 114 uvec3.u32[2] = size[0] * size[1]; 115 nir_ssa_def *div_val = nir_build_imm(b, 3, 32, uvec3); 116 uvec3.u32[0] = size[0]; 117 uvec3.u32[1] = size[1]; 118 uvec3.u32[2] = size[2]; 119 nir_ssa_def *mod_val = nir_build_imm(b, 3, 32, uvec3); 120 121 sysval = nir_imod(b, nir_idiv(b, local_index, div_val), mod_val); 122 break; 123 } 124 125 default: 126 continue; 127 } 128 129 nir_ssa_def_rewrite_uses(&intrinsic->dest.ssa, nir_src_for_ssa(sysval)); 130 nir_instr_remove(&intrinsic->instr); 131 132 state->progress = true; 133 } 134 135 return progress; 136} 137 138static void 139lower_cs_intrinsics_convert_impl(struct lower_intrinsics_state *state) 140{ 141 nir_builder_init(&state->builder, state->impl); 142 143 nir_foreach_block(block, state->impl) { 144 lower_cs_intrinsics_convert_block(state, block); 145 } 146 147 nir_metadata_preserve(state->impl, 148 nir_metadata_block_index | nir_metadata_dominance); 149} 150 151bool 152brw_nir_lower_intrinsics(nir_shader *nir, struct brw_stage_prog_data *prog_data) 153{ 154 /* Currently we only lower intrinsics for compute shaders */ 155 if (nir->stage != MESA_SHADER_COMPUTE) 156 return false; 157 158 bool progress = false; 159 struct lower_intrinsics_state state; 160 memset(&state, 0, sizeof(state)); 161 state.nir = nir; 162 state.prog_data = prog_data; 163 164 do { 165 state.progress = false; 166 nir_foreach_function(function, nir) { 167 if (function->impl) { 168 state.impl = function->impl; 169 lower_cs_intrinsics_convert_impl(&state); 170 } 171 } 172 progress |= state.progress; 173 } while (state.progress); 174 175 if (nir->stage == MESA_SHADER_COMPUTE && !state.cs_thread_id_used) 176 state.cs_prog_data->thread_local_id_index = -1; 177 178 return progress; 179} 180