| // 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(opt::IRContext*) override; |
| virtual opt::IRContext::Analysis GetPreservedAnalyses() override { |
| return opt::IRContext::kAnalysisDefUse | |
| opt::IRContext::kAnalysisInstrToBlockMapping | |
| opt::IRContext::kAnalysisDecorations | |
| opt::IRContext::kAnalysisCombinators | |
| opt::IRContext::kAnalysisNameMap; |
| } |
| |
| private: |
| // Kill any OpName instruction referencing |inst|, then kill |inst|. |
| void KillInstAndName(opt::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(opt::Function* func); |
| |
| // Returns true if |block| (or |id|) contains a merge instruction. |
| bool IsHeader(opt::BasicBlock* block); |
| bool IsHeader(uint32_t id); |
| |
| // Returns true if |block| (or |id|) is the merge target of a merge |
| // instruction. |
| bool IsMerge(opt::BasicBlock* block); |
| bool IsMerge(uint32_t id); |
| |
| void Initialize(opt::IRContext* c); |
| Pass::Status ProcessImpl(); |
| }; |
| |
| } // namespace opt |
| } // namespace spvtools |
| |
| #endif // LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_ |