1 // Copyright (c) 2018 Google LLC. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef SOURCE_OPT_LOOP_UNSWITCH_PASS_H_ 16 #define SOURCE_OPT_LOOP_UNSWITCH_PASS_H_ 17 18 #include "source/opt/loop_descriptor.h" 19 #include "source/opt/pass.h" 20 21 namespace spvtools { 22 namespace opt { 23 24 // Implements the loop unswitch optimization. 25 // The loop unswitch hoists invariant "if" statements if the conditions are 26 // constant within the loop and clones the loop for each branch. 27 class LoopUnswitchPass : public Pass { 28 public: 29 const char* name() const override { return "loop-unswitch"; } 30 31 // Processes the given |module|. Returns Status::Failure if errors occur when 32 // processing. Returns the corresponding Status::Success if processing is 33 // succesful to indicate whether changes have been made to the modue. 34 Pass::Status Process() override; 35 36 private: 37 bool ProcessFunction(Function* f); 38 }; 39 40 } // namespace opt 41 } // namespace spvtools 42 43 #endif // SOURCE_OPT_LOOP_UNSWITCH_PASS_H_ 44
