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https://github.com/KhronosGroup/SPIRV-Tools
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a1f9e1342e
The following passes are updated to preserve the inst-to-block and def-use analysies: private-to-local aggressive dead-code elimination dead branch elimination local-single-block elimination local-single-store elimination reduce load size compact ids (inst-to-block only) merge block dead-insert elimination ccp The one execption is that compact ids still kills the def-use manager. This is because it changes so many ids it is faster to kill and rebuild. Does everything in https://github.com/KhronosGroup/SPIRV-Tools/issues/1593 except for the changes to merge return.
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(ir::IRContext*) override;
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virtual ir::IRContext::Analysis GetPreservedAnalyses() override {
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return ir::IRContext::kAnalysisDefUse |
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ir::IRContext::kAnalysisInstrToBlockMapping |
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ir::IRContext::kAnalysisDecorations |
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ir::IRContext::kAnalysisCombinators |
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ir::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(ir::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(ir::Function* func);
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// Returns true if |block| (or |id|) contains a merge instruction.
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bool IsHeader(ir::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(ir::BasicBlock* block);
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bool IsMerge(uint32_t id);
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void Initialize(ir::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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