SPIRV-Tools/source/opt/insert_extract_elim.h

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2.3 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 LIBSPIRV_OPT_INSERT_EXTRACT_ELIM_PASS_H_
#define LIBSPIRV_OPT_INSERT_EXTRACT_ELIM_PASS_H_
#include <algorithm>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include "basic_block.h"
#include "def_use_manager.h"
#include "ir_context.h"
#include "mem_pass.h"
#include "module.h"
namespace spvtools {
namespace opt {
// See optimizer.hpp for documentation.
class InsertExtractElimPass : public MemPass {
public:
InsertExtractElimPass();
const char* name() const override { return "eliminate-insert-extract"; }
Status Process(ir::IRContext*) override;
private:
// Return id of component of |cinst| specified by |extIndices| starting with
// index at |extOffset|. Return 0 if indices cannot be matched exactly.
uint32_t DoExtract(ir::Instruction* cinst, std::vector<uint32_t>* extIndices,
uint32_t extOffset);
// Look for OpExtract on sequence of OpInserts in |func|. If there is a
// reaching insert which corresponds to the indices of the extract, replace
// the extract with the value that is inserted. Also resolve extracts from
// CompositeConstruct or ConstantComposite.
bool EliminateInsertExtract(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_INSERT_EXTRACT_ELIM_PASS_H_