1 // Copyright (c) 2017 The Khronos Group Inc. 2 // Copyright (c) 2017 Valve Corporation 3 // Copyright (c) 2017 LunarG Inc. 4 // 5 // Licensed under the Apache License, Version 2.0 (the "License"); 6 // you may not use this file except in compliance with the License. 7 // You may obtain a copy of the License at 8 // 9 // http://www.apache.org/licenses/LICENSE-2.0 10 // 11 // Unless required by applicable law or agreed to in writing, software 12 // distributed under the License is distributed on an "AS IS" BASIS, 13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 // See the License for the specific language governing permissions and 15 // limitations under the License. 16 17 #ifndef LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_ 18 #define LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_ 19 20 #include <algorithm> 21 #include <map> 22 #include <queue> 23 #include <unordered_map> 24 #include <unordered_set> 25 #include <utility> 26 27 #include "basic_block.h" 28 #include "def_use_manager.h" 29 #include "module.h" 30 #include "pass.h" 31 32 namespace spvtools { 33 namespace opt { 34 35 // See optimizer.hpp for documentation. 36 class BlockMergePass : public Pass { 37 public: 38 BlockMergePass(); 39 const char* name() const override { return "sroa"; } 40 Status Process(ir::Module*) override; 41 42 private: 43 // Return true if |block_ptr| is loop header block 44 bool IsLoopHeader(ir::BasicBlock* block_ptr); 45 46 // Return true if |labId| has multiple refs. Do not count OpName. 47 bool HasMultipleRefs(uint32_t labId); 48 49 // Kill any OpName instruction referencing |inst|, then kill |inst|. 50 void KillInstAndName(ir::Instruction* inst); 51 52 // Search |func| for blocks which have a single Branch to a block 53 // with no other predecessors. Merge these blocks into a single block. 54 bool MergeBlocks(ir::Function* func); 55 56 // Initialize extensions whitelist 57 void InitExtensions(); 58 59 // Return true if all extensions in this module are allowed by this pass. 60 bool AllExtensionsSupported() const; 61 62 void Initialize(ir::Module* module); 63 Pass::Status ProcessImpl(); 64 65 // Module this pass is processing 66 ir::Module* module_; 67 68 // Def-Uses for the module we are processing 69 std::unique_ptr<analysis::DefUseManager> def_use_mgr_; 70 71 // Extensions supported by this pass. 72 std::unordered_set<std::string> extensions_whitelist_; 73 }; 74 75 } // namespace opt 76 } // namespace spvtools 77 78 #endif // LIBSPIRV_OPT_BLOCK_MERGE_PASS_H_ 79 80
