1 //===- SimplifyCFG.h - Simplify and canonicalize the CFG --------*- 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 /// This file provides the interface for the pass responsible for both 11 /// simplifying and canonicalizing the CFG. 12 /// 13 //===----------------------------------------------------------------------===// 14 15 #ifndef LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H 16 #define LLVM_TRANSFORMS_SCALAR_SIMPLIFYCFG_H 17 18 #include "llvm/IR/Function.h" 19 #include "llvm/IR/PassManager.h" 20 21 namespace llvm { 22 23 /// \brief A pass to simplify and canonicalize the CFG of a function. 24 /// 25 /// This pass iteratively simplifies the entire CFG of a function, removing 26 /// unnecessary control flows and bringing it into the canonical form expected 27 /// by the rest of the mid-level optimizer. 28 class SimplifyCFGPass : public PassInfoMixin<SimplifyCFGPass> { 29 int BonusInstThreshold; 30 bool LateSimplifyCFG; 31 32 public: 33 /// \brief Construct a pass with the default thresholds 34 /// and switch optimizations. 35 SimplifyCFGPass(); 36 37 /// \brief Construct a pass with a specific bonus threshold 38 /// and optional switch optimizations. 39 SimplifyCFGPass(int BonusInstThreshold, bool LateSimplifyCFG); 40 41 /// \brief Run the pass over the function. 42 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 43 }; 44 45 } 46 47 #endif 48
