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https://github.com/KhronosGroup/SPIRV-Tools
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e6b953361d
This CL moves the files in opt/ to consistenly be under the opt:: namespace. This frees up the ir:: namespace so it can be used to make a shared ir represenation.
75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
// Copyright (c) 2017 The Khronos Group Inc.
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// Copyright (c) 2017 Valve Corporation
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// Copyright (c) 2017 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_BLOCK_MERGE_PASS_H_
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#define LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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#include <algorithm>
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#include <map>
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#include <queue>
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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 "module.h"
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#include "pass.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 BlockMergePass : public Pass {
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public:
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BlockMergePass();
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const char* name() const override { return "merge-blocks"; }
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Status Process(opt::IRContext*) override;
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virtual opt::IRContext::Analysis GetPreservedAnalyses() override {
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return opt::IRContext::kAnalysisDefUse |
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opt::IRContext::kAnalysisInstrToBlockMapping |
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opt::IRContext::kAnalysisDecorations |
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opt::IRContext::kAnalysisCombinators |
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opt::IRContext::kAnalysisNameMap;
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}
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private:
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// Kill any OpName instruction referencing |inst|, then kill |inst|.
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void KillInstAndName(opt::Instruction* inst);
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// Search |func| for blocks which have a single Branch to a block
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// with no other predecessors. Merge these blocks into a single block.
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bool MergeBlocks(opt::Function* func);
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// Returns true if |block| (or |id|) contains a merge instruction.
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bool IsHeader(opt::BasicBlock* block);
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bool IsHeader(uint32_t id);
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// Returns true if |block| (or |id|) is the merge target of a merge
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// instruction.
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bool IsMerge(opt::BasicBlock* block);
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bool IsMerge(uint32_t id);
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void Initialize(opt::IRContext* c);
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Pass::Status ProcessImpl();
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};
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} // namespace opt
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} // namespace spvtools
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#endif // LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_
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