SPIRV-Tools/source/opt/block_merge_pass.h
dan sinclair eda2cfbe12
Cleanup includes. (#1795)
This Cl cleans up the include paths to be relative to the top level
directory. Various include-what-you-use fixes have been added.
2018-08-03 15:06:09 -04:00

72 lines
2.2 KiB
C++

// 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.
#ifndef SOURCE_OPT_BLOCK_MERGE_PASS_H_
#define SOURCE_OPT_BLOCK_MERGE_PASS_H_
#include <algorithm>
#include <map>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include "source/opt/basic_block.h"
#include "source/opt/def_use_manager.h"
#include "source/opt/ir_context.h"
#include "source/opt/module.h"
#include "source/opt/pass.h"
namespace spvtools {
namespace opt {
// See optimizer.hpp for documentation.
class BlockMergePass : public Pass {
public:
BlockMergePass();
const char* name() const override { return "merge-blocks"; }
Status Process() override;
IRContext::Analysis GetPreservedAnalyses() override {
return IRContext::kAnalysisDefUse |
IRContext::kAnalysisInstrToBlockMapping |
IRContext::kAnalysisDecorations | IRContext::kAnalysisCombinators |
IRContext::kAnalysisNameMap;
}
private:
// Kill any OpName instruction referencing |inst|, then kill |inst|.
void KillInstAndName(Instruction* inst);
// Search |func| for blocks which have a single Branch to a block
// with no other predecessors. Merge these blocks into a single block.
bool MergeBlocks(Function* func);
// Returns true if |block| (or |id|) contains a merge instruction.
bool IsHeader(BasicBlock* block);
bool IsHeader(uint32_t id);
// Returns true if |block| (or |id|) is the merge target of a merge
// instruction.
bool IsMerge(BasicBlock* block);
bool IsMerge(uint32_t id);
};
} // namespace opt
} // namespace spvtools
#endif // SOURCE_OPT_BLOCK_MERGE_PASS_H_