mirror of
https://github.com/bkaradzic/bgfx.git
synced 2026-02-21 06:13:07 +01:00
78 lines
2.3 KiB
C++
78 lines
2.3 KiB
C++
// Copyright (c) 2019 Google LLC.
|
|
//
|
|
// 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 "source/opt/decompose_initialized_variables_pass.h"
|
|
|
|
#include "source/opt/ir_context.h"
|
|
|
|
namespace spvtools {
|
|
namespace opt {
|
|
|
|
using inst_iterator = InstructionList::iterator;
|
|
|
|
namespace {
|
|
|
|
bool HasInitializer(Instruction* inst) {
|
|
if (inst->opcode() != SpvOpVariable) return false;
|
|
if (inst->NumOperands() < 4) return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
} // namespace
|
|
|
|
Pass::Status DecomposeInitializedVariablesPass::Process() {
|
|
auto* module = context()->module();
|
|
bool changed = false;
|
|
|
|
// TODO(zoddicus): Handle 'Output' variables
|
|
// TODO(zoddicus): Handle 'Private' variables
|
|
|
|
// Handle 'Function' variables
|
|
for (auto func = module->begin(); func != module->end(); ++func) {
|
|
auto block = func->entry().get();
|
|
std::vector<Instruction*> new_stores;
|
|
|
|
auto last_var = block->begin();
|
|
for (auto iter = block->begin();
|
|
iter != block->end() && iter->opcode() == SpvOpVariable; ++iter) {
|
|
last_var = iter;
|
|
Instruction* inst = &(*iter);
|
|
if (!HasInitializer(inst)) continue;
|
|
|
|
changed = true;
|
|
auto var_id = inst->result_id();
|
|
auto val_id = inst->GetOperand(3).words[0];
|
|
Instruction* store_inst = new Instruction(
|
|
context(), SpvOpStore, 0, 0,
|
|
{{SPV_OPERAND_TYPE_ID, {var_id}}, {SPV_OPERAND_TYPE_ID, {val_id}}});
|
|
new_stores.push_back(store_inst);
|
|
iter->RemoveOperand(3);
|
|
get_def_use_mgr()->UpdateDefUse(&*iter);
|
|
}
|
|
|
|
for (auto store = new_stores.begin(); store != new_stores.end(); ++store) {
|
|
context()->AnalyzeDefUse(*store);
|
|
context()->set_instr_block(*store, block);
|
|
(*store)->InsertAfter(&*last_var);
|
|
last_var = *store;
|
|
}
|
|
}
|
|
|
|
return changed ? Status::SuccessWithChange : Status::SuccessWithoutChange;
|
|
}
|
|
|
|
} // namespace opt
|
|
} // namespace spvtools
|