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 #include "llvm/Support/ValueHandle.h" 21 22 namespace llvm { 23 24 extern cl::opt<bool> DisableIVRewrite; 25 26 class CastInst; 27 class IVUsers; 28 class Loop; 29 class LPPassManager; 30 class PHINode; 31 class ScalarEvolution; 32 33 /// Interface for visiting interesting IV users that are recognized but not 34 /// simplified by this utility. 35 class IVVisitor { 36 virtual void anchor(); 37 public: 38 virtual ~IVVisitor() {} 39 virtual void visitCast(CastInst *Cast) = 0; 40 }; 41 42 /// simplifyUsersOfIV - Simplify instructions that use this induction variable 43 /// by using ScalarEvolution to analyze the IV's recurrence. 44 bool simplifyUsersOfIV(PHINode *CurrIV, ScalarEvolution *SE, LPPassManager *LPM, 45 SmallVectorImpl<WeakVH> &Dead, IVVisitor *V = NULL); 46 47 /// SimplifyLoopIVs - Simplify users of induction variables within this 48 /// loop. This does not actually change or add IVs. 49 bool simplifyLoopIVs(Loop *L, ScalarEvolution *SE, LPPassManager *LPM, 50 SmallVectorImpl<WeakVH> &Dead); 51 52 } // namespace llvm 53 54 #endif 55
