| // Copyright (c) 2017 The Khronos Group Inc. |
| // Copyright (c) 2017 Valve Corporation |
| // Copyright (c) 2017 LunarG Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "insert_extract_elim.h" |
| |
| #include "iterator.h" |
| |
| namespace spvtools { |
| namespace opt { |
| |
| namespace { |
| |
| const uint32_t kExtractCompositeIdInIdx = 0; |
| const uint32_t kInsertObjectIdInIdx = 0; |
| const uint32_t kInsertCompositeIdInIdx = 1; |
| |
| } // anonymous namespace |
| |
| bool InsertExtractElimPass::ExtInsMatch(const ir::Instruction* extInst, |
| const ir::Instruction* insInst) const { |
| if (extInst->NumInOperands() != insInst->NumInOperands() - 1) |
| return false; |
| uint32_t numIdx = extInst->NumInOperands() - 1; |
| for (uint32_t i = 0; i < numIdx; ++i) |
| if (extInst->GetSingleWordInOperand(i + 1) != |
| insInst->GetSingleWordInOperand(i + 2)) |
| return false; |
| return true; |
| } |
| |
| bool InsertExtractElimPass::ExtInsConflict(const ir::Instruction* extInst, |
| const ir::Instruction* insInst) const { |
| if (extInst->NumInOperands() == insInst->NumInOperands() - 1) |
| return false; |
| uint32_t extNumIdx = extInst->NumInOperands() - 1; |
| uint32_t insNumIdx = insInst->NumInOperands() - 2; |
| uint32_t numIdx = std::min(extNumIdx, insNumIdx); |
| for (uint32_t i = 0; i < numIdx; ++i) |
| if (extInst->GetSingleWordInOperand(i + 1) != |
| insInst->GetSingleWordInOperand(i + 2)) |
| return false; |
| return true; |
| } |
| |
| bool InsertExtractElimPass::EliminateInsertExtract(ir::Function* func) { |
| bool modified = false; |
| for (auto bi = func->begin(); bi != func->end(); ++bi) { |
| for (auto ii = bi->begin(); ii != bi->end(); ++ii) { |
| switch (ii->opcode()) { |
| case SpvOpCompositeExtract: { |
| uint32_t cid = ii->GetSingleWordInOperand(kExtractCompositeIdInIdx); |
| ir::Instruction* cinst = def_use_mgr_->GetDef(cid); |
| uint32_t replId = 0; |
| while (cinst->opcode() == SpvOpCompositeInsert) { |
| if (ExtInsConflict(&*ii, cinst)) |
| break; |
| if (ExtInsMatch(&*ii, cinst)) { |
| replId = cinst->GetSingleWordInOperand(kInsertObjectIdInIdx); |
| break; |
| } |
| cid = cinst->GetSingleWordInOperand(kInsertCompositeIdInIdx); |
| cinst = def_use_mgr_->GetDef(cid); |
| } |
| if (replId != 0) { |
| const uint32_t extId = ii->result_id(); |
| (void)def_use_mgr_->ReplaceAllUsesWith(extId, replId); |
| def_use_mgr_->KillInst(&*ii); |
| modified = true; |
| } |
| } break; |
| default: |
| break; |
| } |
| } |
| } |
| return modified; |
| } |
| |
| void InsertExtractElimPass::Initialize(ir::Module* module) { |
| |
| module_ = module; |
| |
| // Do def/use on whole module |
| def_use_mgr_.reset(new analysis::DefUseManager(consumer(), module_)); |
| |
| // Initialize extension whitelist |
| InitExtensions(); |
| }; |
| |
| bool InsertExtractElimPass::AllExtensionsSupported() const { |
| // If any extension not in whitelist, return false |
| for (auto& ei : module_->extensions()) { |
| const char* extName = reinterpret_cast<const char*>( |
| &ei.GetInOperand(0).words[0]); |
| if (extensions_whitelist_.find(extName) == extensions_whitelist_.end()) |
| return false; |
| } |
| return true; |
| } |
| |
| Pass::Status InsertExtractElimPass::ProcessImpl() { |
| // Do not process if any disallowed extensions are enabled |
| if (!AllExtensionsSupported()) |
| return Status::SuccessWithoutChange; |
| // Process all entry point functions. |
| ProcessFunction pfn = [this](ir::Function* fp) { |
| return EliminateInsertExtract(fp); |
| }; |
| bool modified = ProcessEntryPointCallTree(pfn, module_); |
| return modified ? Status::SuccessWithChange : Status::SuccessWithoutChange; |
| } |
| |
| InsertExtractElimPass::InsertExtractElimPass() |
| : module_(nullptr), def_use_mgr_(nullptr) {} |
| |
| Pass::Status InsertExtractElimPass::Process(ir::Module* module) { |
| Initialize(module); |
| return ProcessImpl(); |
| } |
| |
| void InsertExtractElimPass::InitExtensions() { |
| extensions_whitelist_.clear(); |
| extensions_whitelist_.insert({ |
| "SPV_AMD_shader_explicit_vertex_parameter", |
| "SPV_AMD_shader_trinary_minmax", |
| "SPV_AMD_gcn_shader", |
| "SPV_KHR_shader_ballot", |
| "SPV_AMD_shader_ballot", |
| "SPV_AMD_gpu_shader_half_float", |
| "SPV_KHR_shader_draw_parameters", |
| "SPV_KHR_subgroup_vote", |
| "SPV_KHR_16bit_storage", |
| "SPV_KHR_device_group", |
| "SPV_KHR_multiview", |
| "SPV_NVX_multiview_per_view_attributes", |
| "SPV_NV_viewport_array2", |
| "SPV_NV_stereo_view_rendering", |
| "SPV_NV_sample_mask_override_coverage", |
| "SPV_NV_geometry_shader_passthrough", |
| "SPV_AMD_texture_gather_bias_lod", |
| "SPV_KHR_storage_buffer_storage_class", |
| "SPV_KHR_variable_pointers", |
| "SPV_AMD_gpu_shader_int16", |
| "SPV_KHR_post_depth_coverage", |
| "SPV_KHR_shader_atomic_counter_ops", |
| }); |
| } |
| |
| } // namespace opt |
| } // namespace spvtools |
| |