InstCombine.h revision ac8f2fd2e217d063d7ef57b8698894739f707431
1ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner//===- InstCombine.h - Main InstCombine pass definition -------------------===// 2ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// 3ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// The LLVM Compiler Infrastructure 4ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// 5ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// This file is distributed under the University of Illinois Open Source 6ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// License. See LICENSE.TXT for details. 7ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner// 8ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner//===----------------------------------------------------------------------===// 9ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 10ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#ifndef INSTCOMBINE_INSTCOMBINE_H 11ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#define INSTCOMBINE_INSTCOMBINE_H 12ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 13ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "InstCombineWorklist.h" 14ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Pass.h" 15ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Analysis/ValueTracking.h" 16ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Support/IRBuilder.h" 17ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Support/InstVisitor.h" 18ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Support/TargetFolder.h" 19ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 20ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnernamespace llvm { 21ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class CallSite; 22ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class TargetData; 23ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class DbgDeclareInst; 24ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class MemIntrinsic; 25ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class MemSetInst; 26ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 27ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// SelectPatternFlavor - We can match a variety of different patterns for 28ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// select operations. 29ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerenum SelectPatternFlavor { 30ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_UNKNOWN = 0, 31ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_SMIN, SPF_UMIN, 32ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_SMAX, SPF_UMAX 33ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner //SPF_ABS - TODO. 34ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 35ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 36ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 37ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// InstCombineIRInserter - This is an IRBuilder insertion helper that works 38ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// just like the normal insertion helper, but also adds any new instructions 39ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// to the instcombine worklist. 40ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerclass VISIBILITY_HIDDEN InstCombineIRInserter 41ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner : public IRBuilderDefaultInserter<true> { 42ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineWorklist &Worklist; 43ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 44ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineIRInserter(InstCombineWorklist &WL) : Worklist(WL) {} 45ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 46ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner void InsertHelper(Instruction *I, const Twine &Name, 47ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BasicBlock *BB, BasicBlock::iterator InsertPt) const { 48ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner IRBuilderDefaultInserter<true>::InsertHelper(I, Name, BB, InsertPt); 49ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(I); 50ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 51ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 52ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 53ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// InstCombiner - The -instcombine pass. 54ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerclass VISIBILITY_HIDDEN InstCombiner 55ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner : public FunctionPass, 56ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner public InstVisitor<InstCombiner, Instruction*> { 57ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner TargetData *TD; 58ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool MustPreserveLCSSA; 59ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool MadeIRChange; 60ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 61ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// Worklist - All of the instructions that need to be simplified. 62ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineWorklist Worklist; 63ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 64ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// Builder - This is an IRBuilder that automatically inserts new 65ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// instructions into the worklist when they are created. 66ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner typedef IRBuilder<true, TargetFolder, InstCombineIRInserter> BuilderTy; 67ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BuilderTy *Builder; 68ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 69ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner static char ID; // Pass identification, replacement for typeid 70ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombiner() : FunctionPass(&ID), TD(0), Builder(0) {} 71ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 72ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 73ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner virtual bool runOnFunction(Function &F); 74ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 75ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool DoOneIteration(Function &F, unsigned ItNum); 76ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 77ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner virtual void getAnalysisUsage(AnalysisUsage &AU) const { 78ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner AU.addPreservedID(LCSSAID); 79ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner AU.setPreservesCFG(); 80ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 81ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 82ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner TargetData *getTargetData() const { return TD; } 83ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 84ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Visitation implementation - Implement instruction combining for different 85ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // instruction types. The semantics are as follows: 86ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Return Value: 87ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // null - No change was made 88ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // I - Change was made, I is still valid, I may be dead though 89ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // otherwise - Change was made, replace I with returned instruction 90ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 91ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAdd(BinaryOperator &I); 92ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFAdd(BinaryOperator &I); 93ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *OptimizePointerDifference(Value *LHS, Value *RHS, const Type *Ty); 94ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSub(BinaryOperator &I); 95ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFSub(BinaryOperator &I); 96ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitMul(BinaryOperator &I); 97ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFMul(BinaryOperator &I); 98ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitURem(BinaryOperator &I); 99ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSRem(BinaryOperator &I); 100ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFRem(BinaryOperator &I); 101ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDivRemOfSelect(BinaryOperator &I); 102ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonRemTransforms(BinaryOperator &I); 103ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonIRemTransforms(BinaryOperator &I); 104ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonDivTransforms(BinaryOperator &I); 105ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonIDivTransforms(BinaryOperator &I); 106ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitUDiv(BinaryOperator &I); 107ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSDiv(BinaryOperator &I); 108ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFDiv(BinaryOperator &I); 109ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldAndOfICmps(Instruction &I, ICmpInst *LHS, ICmpInst *RHS); 110ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldAndOfFCmps(Instruction &I, FCmpInst *LHS, FCmpInst *RHS); 111ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAnd(BinaryOperator &I); 112ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldOrOfICmps(Instruction &I, ICmpInst *LHS, ICmpInst *RHS); 113ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldOrOfFCmps(Instruction &I, FCmpInst *LHS, FCmpInst *RHS); 114ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldOrWithConstants(BinaryOperator &I, Value *Op, 115ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *A, Value *B, Value *C); 116ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitOr (BinaryOperator &I); 117ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitXor(BinaryOperator &I); 118ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitShl(BinaryOperator &I); 119ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAShr(BinaryOperator &I); 120ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitLShr(BinaryOperator &I); 121ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonShiftTransforms(BinaryOperator &I); 122ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldFCmp_IntToFP_Cst(FCmpInst &I, Instruction *LHSI, 123ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Constant *RHSC); 124ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldCmpLoadFromIndexedGlobal(GetElementPtrInst *GEP, 125ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner GlobalVariable *GV, CmpInst &ICI, 126ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *AndCst = 0); 127ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFCmpInst(FCmpInst &I); 128ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInst(ICmpInst &I); 129ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInstWithCastAndCast(ICmpInst &ICI); 130ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInstWithInstAndIntCst(ICmpInst &ICI, 131ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *LHS, 132ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *RHS); 133ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldICmpDivCst(ICmpInst &ICI, BinaryOperator *DivI, 134ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *DivRHS); 135ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldICmpAddOpCst(ICmpInst &ICI, Value *X, ConstantInt *CI, 136ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ICmpInst::Predicate Pred, Value *TheAdd); 137ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldGEPICmp(GEPOperator *GEPLHS, Value *RHS, 138ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ICmpInst::Predicate Cond, Instruction &I); 139ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldShiftByConstant(Value *Op0, ConstantInt *Op1, 140ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BinaryOperator &I); 141ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonCastTransforms(CastInst &CI); 142ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonIntCastTransforms(CastInst &CI); 143ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonPointerCastTransforms(CastInst &CI); 144ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitTrunc(TruncInst &CI); 145ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitZExt(ZExtInst &CI); 146ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSExt(SExtInst &CI); 147ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPTrunc(FPTruncInst &CI); 148ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPExt(CastInst &CI); 149ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPToUI(FPToUIInst &FI); 150ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPToSI(FPToSIInst &FI); 151ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitUIToFP(CastInst &CI); 152ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSIToFP(CastInst &CI); 153ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitPtrToInt(PtrToIntInst &CI); 154ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitIntToPtr(IntToPtrInst &CI); 155ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitBitCast(BitCastInst &CI); 156ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSelectOpOp(SelectInst &SI, Instruction *TI, 157ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FI); 158ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSelectIntoOp(SelectInst &SI, Value*, Value*); 159ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSPFofSPF(Instruction *Inner, SelectPatternFlavor SPF1, 160ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *A, Value *B, Instruction &Outer, 161ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SelectPatternFlavor SPF2, Value *C); 162ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSelectInst(SelectInst &SI); 163ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSelectInstWithICmp(SelectInst &SI, ICmpInst *ICI); 164ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitCallInst(CallInst &CI); 165ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInvokeInst(InvokeInst &II); 166ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 167ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SliceUpIllegalIntegerPHI(PHINode &PN); 168ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitPHINode(PHINode &PN); 169ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitGetElementPtrInst(GetElementPtrInst &GEP); 170ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAllocaInst(AllocaInst &AI); 171ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFree(Instruction &FI); 172ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitLoadInst(LoadInst &LI); 173ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitStoreInst(StoreInst &SI); 174ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitBranchInst(BranchInst &BI); 175ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSwitchInst(SwitchInst &SI); 176ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInsertElementInst(InsertElementInst &IE); 177ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitExtractElementInst(ExtractElementInst &EI); 178ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitShuffleVectorInst(ShuffleVectorInst &SVI); 179ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitExtractValueInst(ExtractValueInst &EV); 180ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 181ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // visitInstruction - Specify what to return for unhandled instructions... 182ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInstruction(Instruction &I) { return 0; } 183ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 184ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerprivate: 185ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitCallSite(CallSite CS); 186ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool transformConstExprCastCall(CallSite CS); 187ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *transformCallThroughTrampoline(CallSite CS); 188ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *transformZExtICmp(ICmpInst *ICI, Instruction &CI, 189ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool DoXform = true); 190ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool WillNotOverflowSignedAdd(Value *LHS, Value *RHS); 191ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner DbgDeclareInst *hasOneUsePlusDeclare(Value *V); 192ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 193ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 194ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 195ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // InsertNewInstBefore - insert an instruction New before instruction Old 196ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // in the program. Add the new instruction to the worklist. 197ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 198ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *InsertNewInstBefore(Instruction *New, Instruction &Old) { 199ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner assert(New && New->getParent() == 0 && 200ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner "New instruction already inserted into a basic block!"); 201ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BasicBlock *BB = Old.getParent(); 202ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BB->getInstList().insert(&Old, New); // Insert inst 203ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(New); 204ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return New; 205ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 206ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 207ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // ReplaceInstUsesWith - This method is to be used when an instruction is 208ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // found to be dead, replacable with another preexisting expression. Here 209ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // we add all uses of I to the worklist, replace all uses of I with the new 210ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // value, then return I, so that the inst combiner will know that I was 211ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // modified. 212ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 213ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *ReplaceInstUsesWith(Instruction &I, Value *V) { 214ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.AddUsersToWorkList(I); // Add all modified instrs to worklist. 215ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 216ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // If we are replacing the instruction with itself, this must be in a 217ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // segment of unreachable code, so just clobber the instruction. 218ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (&I == V) 219ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner V = UndefValue::get(I.getType()); 220ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 221ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner I.replaceAllUsesWith(V); 222ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return &I; 223ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 224ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 225ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // EraseInstFromFunction - When dealing with an instruction that has side 226ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // effects or produces a void value, we can't rely on DCE to delete the 227ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // instruction. Instead, visit methods should return the value returned by 228ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // this function. 229ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *EraseInstFromFunction(Instruction &I) { 230ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner DEBUG(errs() << "IC: ERASE " << I << '\n'); 231ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 232ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner assert(I.use_empty() && "Cannot erase instruction that is used!"); 233ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Make sure that we reprocess all operands now that we reduced their 234ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // use counts. 235ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (I.getNumOperands() < 8) { 236ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner for (User::op_iterator i = I.op_begin(), e = I.op_end(); i != e; ++i) 237ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (Instruction *Op = dyn_cast<Instruction>(*i)) 238ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(Op); 239ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 240ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Remove(&I); 241ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner I.eraseFromParent(); 242ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner MadeIRChange = true; 243ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return 0; // Don't do anything with FI 244ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 245ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 246ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner void ComputeMaskedBits(Value *V, const APInt &Mask, APInt &KnownZero, 247ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt &KnownOne, unsigned Depth = 0) const { 248ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return llvm::ComputeMaskedBits(V, Mask, KnownZero, KnownOne, TD, Depth); 249ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 250ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 251ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool MaskedValueIsZero(Value *V, const APInt &Mask, 252ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth = 0) const { 253ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return llvm::MaskedValueIsZero(V, Mask, TD, Depth); 254ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 255ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned ComputeNumSignBits(Value *Op, unsigned Depth = 0) const { 256ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return llvm::ComputeNumSignBits(Op, TD, Depth); 257ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 258ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 259ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerprivate: 260ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 261ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyCommutative - This performs a few simplifications for 262ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// commutative operators. 263ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyCommutative(BinaryOperator &I); 264ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 265ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedUseBits - Attempts to replace V with a simpler value 266ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// based on the demanded bits. 267ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *SimplifyDemandedUseBits(Value *V, APInt DemandedMask, 268ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& KnownZero, APInt& KnownOne, 269ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth); 270ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDemandedBits(Use &U, APInt DemandedMask, 271ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& KnownZero, APInt& KnownOne, 272ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth=0); 273ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 274ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedInstructionBits - Inst is an integer instruction that 275ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedBits knows about. See if the instruction has any 276ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// properties that allow us to simplify its operands. 277ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDemandedInstructionBits(Instruction &Inst); 278ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 279ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *SimplifyDemandedVectorElts(Value *V, APInt DemandedElts, 280ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& UndefElts, unsigned Depth = 0); 281ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 282ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // FoldOpIntoPhi - Given a binary operator, cast instruction, or select 283ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // which has a PHI node as operand #0, see if we can fold the instruction 284ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // into the PHI (which is only possible if all operands to the PHI are 285ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // constants). 286ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 287ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // If AllowAggressive is true, FoldOpIntoPhi will allow certain transforms 288ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // that would normally be unprofitable because they strongly encourage jump 289ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // threading. 290ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldOpIntoPhi(Instruction &I, bool AllowAggressive = false); 291ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 292ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // FoldPHIArgOpIntoPHI - If all operands to a PHI node are the same "unary" 293ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // operator and they all are only used by the PHI, PHI together their 294ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // inputs, and do the operation once, to the result of the PHI. 295ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgOpIntoPHI(PHINode &PN); 296ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgBinOpIntoPHI(PHINode &PN); 297ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgGEPIntoPHI(PHINode &PN); 298ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgLoadIntoPHI(PHINode &PN); 299ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 300ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 301ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *OptAndOp(Instruction *Op, ConstantInt *OpRHS, 302ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *AndRHS, BinaryOperator &TheAnd); 303ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 304ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *FoldLogicalPlusAnd(Value *LHS, Value *RHS, ConstantInt *Mask, 305ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool isSub, Instruction &I); 306ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *InsertRangeTest(Value *V, Constant *Lo, Constant *Hi, 307ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool isSigned, bool Inside, Instruction &IB); 308ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *PromoteCastOfAllocation(BitCastInst &CI, AllocaInst &AI); 309ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *MatchBSwap(BinaryOperator &I); 310ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyStoreAtEndOfBlock(StoreInst &SI); 311ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SimplifyMemTransfer(MemIntrinsic *MI); 312ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SimplifyMemSet(MemSetInst *MI); 313ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 314ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 315ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *EvaluateInDifferentType(Value *V, const Type *Ty, bool isSigned); 316ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 317ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool CanEvaluateInDifferentType(Value *V, const Type *Ty, 318ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned CastOpc, int &NumCastsRemoved); 319ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned GetOrEnforceKnownAlignment(Value *V, 320ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned PrefAlign = 0); 321ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 322ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 323ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 324ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 325ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 326ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner} // end namespace llvm. 327ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 328ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#endif 329