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 27 struct lower_intrinsics_state { 28 nir_shader *nir; 29 unsigned dispatch_width; 30 nir_function_impl *impl; 31 bool progress; 32 nir_builder builder; 33 unsigned local_workgroup_size; 34 }; 35 36 static bool 37 lower_cs_intrinsics_convert_block(struct lower_intrinsics_state *state, 38 nir_block *block) 39 { 40 bool progress = false; 41 nir_builder *b = &state->builder; 42 nir_shader *nir = state->nir; 43 44 nir_foreach_instr_safe(instr, block) { 45 if (instr->type != nir_instr_type_intrinsic) 46 continue; 47 48 nir_intrinsic_instr *intrinsic = nir_instr_as_intrinsic(instr); 49 50 b->cursor = nir_after_instr(&intrinsic->instr); 51 52 nir_ssa_def *sysval; 53 switch (intrinsic->intrinsic) { 54 case nir_intrinsic_load_local_invocation_index: { 55 /* We construct the local invocation index from: 56 * 57 * gl_LocalInvocationIndex = 58 * cs_thread_local_id + subgroup_invocation; 59 */ 60 nir_ssa_def *subgroup_id; 61 if (state->local_workgroup_size <= state->dispatch_width) 62 subgroup_id = nir_imm_int(b, 0); 63 else 64 subgroup_id = nir_load_subgroup_id(b); 65 66 nir_ssa_def *thread_local_id = 67 nir_imul(b, subgroup_id, nir_imm_int(b, state->dispatch_width)); 68 nir_ssa_def *channel = nir_load_subgroup_invocation(b); 69 sysval = nir_iadd(b, channel, thread_local_id); 70 break; 71 } 72 73 case nir_intrinsic_load_local_invocation_id: { 74 /* We lower gl_LocalInvocationID from gl_LocalInvocationIndex based 75 * on this formula: 76 * 77 * gl_LocalInvocationID.x = 78 * gl_LocalInvocationIndex % gl_WorkGroupSize.x; 79 * gl_LocalInvocationID.y = 80 * (gl_LocalInvocationIndex / gl_WorkGroupSize.x) % 81 * gl_WorkGroupSize.y; 82 * gl_LocalInvocationID.z = 83 * (gl_LocalInvocationIndex / 84 * (gl_WorkGroupSize.x * gl_WorkGroupSize.y)) % 85 * gl_WorkGroupSize.z; 86 */ 87 unsigned *size = nir->info.cs.local_size; 88 89 nir_ssa_def *local_index = nir_load_local_invocation_index(b); 90 91 nir_const_value uvec3; 92 memset(&uvec3, 0, sizeof(uvec3)); 93 uvec3.u32[0] = 1; 94 uvec3.u32[1] = size[0]; 95 uvec3.u32[2] = size[0] * size[1]; 96 nir_ssa_def *div_val = nir_build_imm(b, 3, 32, uvec3); 97 uvec3.u32[0] = size[0]; 98 uvec3.u32[1] = size[1]; 99 uvec3.u32[2] = size[2]; 100 nir_ssa_def *mod_val = nir_build_imm(b, 3, 32, uvec3); 101 102 sysval = nir_umod(b, nir_udiv(b, local_index, div_val), mod_val); 103 break; 104 } 105 106 default: 107 continue; 108 } 109 110 nir_ssa_def_rewrite_uses(&intrinsic->dest.ssa, nir_src_for_ssa(sysval)); 111 nir_instr_remove(&intrinsic->instr); 112 113 state->progress = true; 114 } 115 116 return progress; 117 } 118 119 static void 120 lower_cs_intrinsics_convert_impl(struct lower_intrinsics_state *state) 121 { 122 nir_builder_init(&state->builder, state->impl); 123 124 nir_foreach_block(block, state->impl) { 125 lower_cs_intrinsics_convert_block(state, block); 126 } 127 128 nir_metadata_preserve(state->impl, 129 nir_metadata_block_index | nir_metadata_dominance); 130 } 131 132 bool 133 brw_nir_lower_cs_intrinsics(nir_shader *nir, 134 unsigned dispatch_width) 135 { 136 assert(nir->info.stage == MESA_SHADER_COMPUTE); 137 138 bool progress = false; 139 struct lower_intrinsics_state state; 140 memset(&state, 0, sizeof(state)); 141 state.nir = nir; 142 state.dispatch_width = dispatch_width; 143 state.local_workgroup_size = nir->info.cs.local_size[0] * 144 nir->info.cs.local_size[1] * 145 nir->info.cs.local_size[2]; 146 147 do { 148 state.progress = false; 149 nir_foreach_function(function, nir) { 150 if (function->impl) { 151 state.impl = function->impl; 152 lower_cs_intrinsics_convert_impl(&state); 153 } 154 } 155 progress |= state.progress; 156 } while (state.progress); 157 158 return progress; 159 } 160
