1 /* 2 * Copyright 2017 Advanced Micro Devices, Inc. 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 * on the rights to use, copy, modify, merge, publish, distribute, sub 8 * license, and/or sell copies of the Software, and to permit persons to whom 9 * the 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 NON-INFRINGEMENT. IN NO EVENT SHALL 18 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM, 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 21 * USE OR OTHER DEALINGS IN THE SOFTWARE. 22 */ 23 24 /* 25 * Remap load_uniform intrinsics to UBO accesses of UBO binding point 0. Both 26 * the base and the offset are interpreted as 16-byte units. 27 * 28 * Simultaneously, remap existing UBO accesses by increasing their binding 29 * point by 1. 30 */ 31 32 #include "nir.h" 33 #include "nir_builder.h" 34 35 static bool 36 lower_instr(nir_intrinsic_instr *instr, nir_builder *b) 37 { 38 b->cursor = nir_before_instr(&instr->instr); 39 40 if (instr->intrinsic == nir_intrinsic_load_ubo) { 41 nir_ssa_def *old_idx = nir_ssa_for_src(b, instr->src[0], 1); 42 nir_ssa_def *new_idx = nir_iadd(b, old_idx, nir_imm_int(b, 1)); 43 nir_instr_rewrite_src(&instr->instr, &instr->src[0], 44 nir_src_for_ssa(new_idx)); 45 return true; 46 } 47 48 if (instr->intrinsic == nir_intrinsic_load_uniform) { 49 nir_ssa_def *ubo_idx = nir_imm_int(b, 0); 50 nir_ssa_def *ubo_offset = 51 nir_imul(b, nir_imm_int(b, 16), 52 nir_iadd(b, nir_imm_int(b, nir_intrinsic_base(instr)), 53 nir_ssa_for_src(b, instr->src[0], 1))); 54 55 nir_intrinsic_instr *load = 56 nir_intrinsic_instr_create(b->shader, nir_intrinsic_load_ubo); 57 load->num_components = instr->num_components; 58 load->src[0] = nir_src_for_ssa(ubo_idx); 59 load->src[1] = nir_src_for_ssa(ubo_offset); 60 nir_ssa_dest_init(&load->instr, &load->dest, 61 load->num_components, instr->dest.ssa.bit_size, 62 instr->dest.ssa.name); 63 nir_builder_instr_insert(b, &load->instr); 64 nir_ssa_def_rewrite_uses(&instr->dest.ssa, nir_src_for_ssa(&load->dest.ssa)); 65 66 nir_instr_remove(&instr->instr); 67 return true; 68 } 69 70 return false; 71 } 72 73 bool 74 nir_lower_uniforms_to_ubo(nir_shader *shader) 75 { 76 bool progress = false; 77 78 nir_foreach_function(function, shader) { 79 if (function->impl) { 80 nir_builder builder; 81 nir_builder_init(&builder, function->impl); 82 nir_foreach_block(block, function->impl) { 83 nir_foreach_instr_safe(instr, block) { 84 if (instr->type == nir_instr_type_intrinsic) 85 progress |= lower_instr(nir_instr_as_intrinsic(instr), 86 &builder); 87 } 88 } 89 90 nir_metadata_preserve(function->impl, nir_metadata_block_index | 91 nir_metadata_dominance); 92 } 93 } 94 95 return progress; 96 } 97 98
