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// 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 LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
#define LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
#include <algorithm>
#include <map>
#include <queue>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include "basic_block.h"
#include "def_use_manager.h"
#include "ir_context.h"
#include "module.h"
#include "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(ir::IRContext*) override;
private:
// Return true if |labId| has multiple refs. Do not count OpName.
bool HasMultipleRefs(uint32_t labId);
// Kill any OpName instruction referencing |inst|, then kill |inst|.
void KillInstAndName(ir::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(ir::Function* func);
// Initialize extensions whitelist
void InitExtensions();
// Return true if all extensions in this module are allowed by this pass.
bool AllExtensionsSupported() const;
void Initialize(ir::IRContext* c);
Pass::Status ProcessImpl();
// Extensions supported by this pass.
std::unordered_set<std::string> extensions_whitelist_;
};
} // namespace opt
} // namespace spvtools
#endif // LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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