1 //===- InstCombine.h - InstCombine pass -------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 /// \file 10 /// 11 /// This file provides the primary interface to the instcombine pass. This pass 12 /// is suitable for use in the new pass manager. For a pass that works with the 13 /// legacy pass manager, please look for \c createInstructionCombiningPass() in 14 /// Scalar.h. 15 /// 16 //===----------------------------------------------------------------------===// 17 18 #ifndef LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINE_H 19 #define LLVM_TRANSFORMS_INSTCOMBINE_INSTCOMBINE_H 20 21 #include "llvm/IR/Function.h" 22 #include "llvm/IR/PassManager.h" 23 #include "llvm/Transforms/InstCombine/InstCombineWorklist.h" 24 25 namespace llvm { 26 27 class InstCombinePass : public PassInfoMixin<InstCombinePass> { 28 InstCombineWorklist Worklist; 29 bool ExpensiveCombines; 30 31 public: 32 static StringRef name() { return "InstCombinePass"; } 33 34 explicit InstCombinePass(bool ExpensiveCombines = true) 35 : ExpensiveCombines(ExpensiveCombines) {} 36 37 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 38 }; 39 40 /// \brief The legacy pass manager's instcombine pass. 41 /// 42 /// This is a basic whole-function wrapper around the instcombine utility. It 43 /// will try to combine all instructions in the function. 44 class InstructionCombiningPass : public FunctionPass { 45 InstCombineWorklist Worklist; 46 const bool ExpensiveCombines; 47 48 public: 49 static char ID; // Pass identification, replacement for typeid 50 51 InstructionCombiningPass(bool ExpensiveCombines = true) 52 : FunctionPass(ID), ExpensiveCombines(ExpensiveCombines) { 53 initializeInstructionCombiningPassPass(*PassRegistry::getPassRegistry()); 54 } 55 56 void getAnalysisUsage(AnalysisUsage &AU) const override; 57 bool runOnFunction(Function &F) override; 58 }; 59 } 60 61 #endif 62
