mirror of
https://github.com/KhronosGroup/SPIRV-Tools
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84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
// Copyright (c) 2018 The Khronos Group Inc.
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// Copyright (c) 2018 Valve Corporation
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// Copyright (c) 2018 LunarG Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef LIBSPIRV_OPT_DEAD_INSERT_ELIM_PASS_H_
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#define LIBSPIRV_OPT_DEAD_INSERT_ELIM_PASS_H_
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#include <algorithm>
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#include <map>
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#include <unordered_map>
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#include <unordered_set>
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#include <utility>
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#include "basic_block.h"
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#include "def_use_manager.h"
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#include "ir_context.h"
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#include "mem_pass.h"
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#include "module.h"
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namespace spvtools {
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namespace opt {
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// See optimizer.hpp for documentation.
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class DeadInsertElimPass : public MemPass {
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public:
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DeadInsertElimPass();
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const char* name() const override { return "eliminate-dead-inserts"; }
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Status Process(ir::IRContext*) override;
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private:
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// Return the number of subcomponents in the composite type |typeId|.
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// Return 0 if not a composite type or number of components is not a
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// 32-bit constant.
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uint32_t NumComponents(ir::Instruction* typeInst);
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// Mark all inserts in instruction chain ending at |insertChain| with
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// indices that intersect with extract indices |extIndices| starting with
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// index at |extOffset|. Chains are composed solely of Inserts and Phis.
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// Mark all inserts in chain if |extIndices| is nullptr.
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void MarkInsertChain(ir::Instruction* insertChain,
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std::vector<uint32_t>* extIndices, uint32_t extOffset,
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std::unordered_set<uint32_t>* visited_phis);
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// Perform EliminateDeadInsertsOnePass(|func|) until no modification is
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// made. Return true if modified.
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bool EliminateDeadInserts(ir::Function* func);
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// DCE all dead struct, matrix and vector inserts in |func|. An insert is
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// dead if the value it inserts is never used. Replace any reference to the
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// insert with its original composite. Return true if modified. Dead inserts
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// in dependence cycles are not currently eliminated. Dead inserts into
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// arrays are not currently eliminated.
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bool EliminateDeadInsertsOnePass(ir::Function* func);
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// Return true if all extensions in this module are allowed by this pass.
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bool AllExtensionsSupported() const;
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void Initialize(ir::IRContext* c);
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Pass::Status ProcessImpl();
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// Live inserts
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std::unordered_set<uint32_t> liveInserts_;
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// Visited phis as insert chain is traversed; used to avoid infinite loop
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std::unordered_map<uint32_t, bool> visitedPhis_;
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_DEAD_INSERT_ELIM_PASS_H_
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