SPIRV-Tools/source/opt/basic_block.cpp

104 lines
2.6 KiB
C++

// Copyright (c) 2016 Google 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 "basic_block.h"
namespace spvtools {
namespace ir {
const Instruction* BasicBlock::GetMergeInst() const {
const Instruction* result = nullptr;
// If it exists, the merge instruction immediately precedes the
// terminator.
auto iter = ctail();
if (iter != cbegin()) {
--iter;
const auto opcode = iter->opcode();
if (opcode == SpvOpLoopMerge || opcode == SpvOpSelectionMerge) {
result = &*iter;
}
}
return result;
}
Instruction* BasicBlock::GetMergeInst() {
Instruction* result = nullptr;
// If it exists, the merge instruction immediately precedes the
// terminator.
auto iter = tail();
if (iter != begin()) {
--iter;
const auto opcode = iter->opcode();
if (opcode == SpvOpLoopMerge || opcode == SpvOpSelectionMerge) {
result = &*iter;
}
}
return result;
}
const Instruction* BasicBlock::GetLoopMergeInst() const {
if (auto* merge = GetMergeInst()) {
if (merge->opcode() == SpvOpLoopMerge) {
return merge;
}
}
return nullptr;
}
Instruction* BasicBlock::GetLoopMergeInst() {
if (auto* merge = GetMergeInst()) {
if (merge->opcode() == SpvOpLoopMerge) {
return merge;
}
}
return nullptr;
}
void BasicBlock::ForEachSuccessorLabel(
const std::function<void(const uint32_t)>& f) {
const auto br = &*insts_.back();
switch (br->opcode()) {
case SpvOpBranch: {
f(br->GetOperand(0).words[0]);
} break;
case SpvOpBranchConditional:
case SpvOpSwitch: {
bool is_first = true;
br->ForEachInId([&is_first, &f](const uint32_t* idp) {
if (!is_first) f(*idp);
is_first = false;
});
} break;
default:
break;
}
}
void BasicBlock::ForMergeAndContinueLabel(
const std::function<void(const uint32_t)>& f) {
auto ii = insts_.end();
--ii;
if (ii == insts_.begin()) return;
--ii;
if ((*ii)->opcode() == SpvOpSelectionMerge ||
(*ii)->opcode() == SpvOpLoopMerge)
(*ii)->ForEachInId([&f](const uint32_t* idp) {
f(*idp);
});
}
} // namespace ir
} // namespace spvtools