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 21namespace 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. 28class SimplifyCFGPass : public PassInfoMixin<SimplifyCFGPass> { 29 int BonusInstThreshold; 30 bool LateSimplifyCFG; 31 32public: 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