mirror of
https://github.com/KhronosGroup/SPIRV-Tools
synced 2024-11-23 12:10:06 +00:00
113 lines
3.8 KiB
C++
113 lines
3.8 KiB
C++
// Copyright (c) 2019 Google LLC.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "source/opt/decompose_initialized_variables_pass.h"
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#include "source/opt/ir_context.h"
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namespace spvtools {
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namespace opt {
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using inst_iterator = InstructionList::iterator;
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namespace {
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bool HasInitializer(Instruction* inst) {
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if (inst->opcode() != SpvOpVariable) return false;
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if (inst->NumOperands() < 4) return false;
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return true;
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}
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} // namespace
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Pass::Status DecomposeInitializedVariablesPass::Process() {
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auto* module = context()->module();
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std::unordered_set<Instruction*> changed;
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std::vector<std::tuple<uint32_t, uint32_t>> global_stores;
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for (auto iter = module->types_values_begin();
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iter != module->types_values_end(); ++iter) {
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Instruction* inst = &(*iter);
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if (!HasInitializer(inst)) continue;
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auto var_id = inst->result_id();
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auto val_id = inst->GetOperand(3).words[0];
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global_stores.push_back(std::make_tuple(var_id, val_id));
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iter->RemoveOperand(3);
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changed.insert(&*iter);
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}
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std::unordered_set<uint32_t> entry_ids;
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for (auto entry = module->entry_points().begin();
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entry != module->entry_points().end(); ++entry) {
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entry_ids.insert(entry->GetSingleWordInOperand(1));
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}
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for (auto func = module->begin(); func != module->end(); ++func) {
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std::vector<Instruction*> function_stores;
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auto first_block = func->entry().get();
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inst_iterator insert_point = first_block->begin();
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for (auto iter = first_block->begin();
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iter != first_block->end() && iter->opcode() == SpvOpVariable;
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++iter) {
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// For valid SPIRV-V, there is guaranteed to be at least one instruction
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// after the OpVariable instructions.
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insert_point = (*iter).NextNode();
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Instruction* inst = &(*iter);
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if (!HasInitializer(inst)) continue;
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auto var_id = inst->result_id();
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auto val_id = inst->GetOperand(3).words[0];
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Instruction* store_inst = new Instruction(
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context(), SpvOpStore, 0, 0,
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{{SPV_OPERAND_TYPE_ID, {var_id}}, {SPV_OPERAND_TYPE_ID, {val_id}}});
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function_stores.push_back(store_inst);
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iter->RemoveOperand(3);
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changed.insert(&*iter);
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}
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if (entry_ids.find(func->result_id()) != entry_ids.end()) {
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for (auto store_ids : global_stores) {
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uint32_t var_id;
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uint32_t val_id;
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std::tie(var_id, val_id) = store_ids;
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auto* store_inst = new Instruction(
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context(), SpvOpStore, 0, 0,
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{{SPV_OPERAND_TYPE_ID, {var_id}}, {SPV_OPERAND_TYPE_ID, {val_id}}});
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context()->set_instr_block(store_inst, &*first_block);
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first_block->AddInstruction(std::unique_ptr<Instruction>(store_inst));
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store_inst->InsertBefore(&*insert_point);
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changed.insert(store_inst);
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}
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}
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for (auto store = function_stores.begin(); store != function_stores.end();
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++store) {
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context()->set_instr_block(*store, first_block);
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(*store)->InsertBefore(&*insert_point);
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changed.insert(*store);
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}
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}
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auto* def_use_mgr = get_def_use_mgr();
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for (auto* inst : changed) def_use_mgr->UpdateDefUse(inst);
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return !changed.empty() ? Pass::Status::SuccessWithChange
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: Pass::Status::SuccessWithoutChange;
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}
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} // namespace opt
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} // namespace spvtools
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