1 //===-- llvm/Transforms/Utils/SimplifyIndVar.h - Indvar Utils ---*- 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 // 10 // This file defines in interface for induction variable simplification. It does 11 // not define any actual pass or policy, but provides a single function to 12 // simplify a loop's induction variables based on ScalarEvolution. 13 // 14 //===----------------------------------------------------------------------===// 15 16 #ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H 17 #define LLVM_TRANSFORMS_UTILS_SIMPLIFYINDVAR_H 18 19 #include "llvm/Support/CommandLine.h" 20 21 namespace llvm { 22 23 extern cl::opt<bool> DisableIVRewrite; 24 25 class Loop; 26 class LoopInfo; 27 class DominatorTree; 28 class ScalarEvolution; 29 class LPPassManager; 30 class IVUsers; 31 32 /// Interface for visiting interesting IV users that are recognized but not 33 /// simplified by this utility. 34 class IVVisitor { 35 public: 36 virtual ~IVVisitor() {} 37 virtual void visitCast(CastInst *Cast) = 0; 38 }; 39 40 /// simplifyUsersOfIV - Simplify instructions that use this induction variable 41 /// by using ScalarEvolution to analyze the IV's recurrence. 42 bool simplifyUsersOfIV(PHINode *CurrIV, ScalarEvolution *SE, LPPassManager *LPM, 43 SmallVectorImpl<WeakVH> &Dead, IVVisitor *V = NULL); 44 45 /// SimplifyLoopIVs - Simplify users of induction variables within this 46 /// loop. This does not actually change or add IVs. 47 bool simplifyLoopIVs(Loop *L, ScalarEvolution *SE, LPPassManager *LPM, 48 SmallVectorImpl<WeakVH> &Dead); 49 50 /// simplifyIVUsers - Simplify instructions recorded by the IVUsers pass. 51 /// This is a legacy implementation to reproduce the behavior of the 52 /// IndVarSimplify pass prior to DisableIVRewrite. 53 bool simplifyIVUsers(IVUsers *IU, ScalarEvolution *SE, LPPassManager *LPM, 54 SmallVectorImpl<WeakVH> &Dead); 55 56 } // namespace llvm 57 58 #endif 59
