InstCombine.h revision 637582eaf77e6892094cea0bf6b9483f50b5d94e
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" 14a1514e24cc24b050f53a12650e047799358833a1Chandler Carruth#include "llvm/Analysis/ValueTracking.h" 150b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/IRBuilder.h" 160b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/IntrinsicInst.h" 170b8c9a80f20772c3793201ab5b251d3520b9cea3Chandler Carruth#include "llvm/IR/Operator.h" 1884bcf93e0fd225de2217d1b712c01586a633a6d8Chandler Carruth#include "llvm/InstVisitor.h" 19ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Pass.h" 20ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#include "llvm/Support/TargetFolder.h" 215e8904576a5260cfd5b14596e338a4bb25b9817eMeador Inge#include "llvm/Transforms/Utils/SimplifyLibCalls.h" 22ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 23ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnernamespace llvm { 24ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner class CallSite; 253574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow class DataLayout; 2600737bdb488cc7157ca5f7a40d6cd8467ad09a79Chad Rosier class TargetLibraryInfo; 2743fd9017a69a6314fb780f87083b1e57a0981287Chris Lattner class DbgDeclareInst; 2843fd9017a69a6314fb780f87083b1e57a0981287Chris Lattner class MemIntrinsic; 2943fd9017a69a6314fb780f87083b1e57a0981287Chris Lattner class MemSetInst; 30ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 31ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// SelectPatternFlavor - We can match a variety of different patterns for 32ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// select operations. 33ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerenum SelectPatternFlavor { 34ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_UNKNOWN = 0, 35ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_SMIN, SPF_UMIN, 36ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SPF_SMAX, SPF_UMAX 37ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner //SPF_ABS - TODO. 38ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 3902446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner 4002446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner/// getComplexity: Assign a complexity or rank value to LLVM Values... 4102446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner/// 0 -> undef, 1 -> Const, 2 -> Other, 3 -> Arg, 3 -> Unary, 4 -> OtherInst 4202446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattnerstatic inline unsigned getComplexity(Value *V) { 4302446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner if (isa<Instruction>(V)) { 4402446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner if (BinaryOperator::isNeg(V) || 4502446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner BinaryOperator::isFNeg(V) || 4602446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner BinaryOperator::isNot(V)) 4702446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner return 3; 4802446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner return 4; 4902446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner } 5002446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner if (isa<Argument>(V)) return 3; 5102446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner return isa<Constant>(V) ? (isa<UndefValue>(V) ? 0 : 1) : 2; 5202446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner} 53ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 54ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 55ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// InstCombineIRInserter - This is an IRBuilder insertion helper that works 56ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// just like the normal insertion helper, but also adds any new instructions 57ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// to the instcombine worklist. 5816d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sandsclass LLVM_LIBRARY_VISIBILITY InstCombineIRInserter 59ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner : public IRBuilderDefaultInserter<true> { 60ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineWorklist &Worklist; 61ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 62ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineIRInserter(InstCombineWorklist &WL) : Worklist(WL) {} 63ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 64ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner void InsertHelper(Instruction *I, const Twine &Name, 65ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BasicBlock *BB, BasicBlock::iterator InsertPt) const { 66ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner IRBuilderDefaultInserter<true>::InsertHelper(I, Name, BB, InsertPt); 67ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(I); 68ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 69ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 70ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 71ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner/// InstCombiner - The -instcombine pass. 7216d8f8bd919b72866e687d99f3aa94a140137c59Duncan Sandsclass LLVM_LIBRARY_VISIBILITY InstCombiner 73ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner : public FunctionPass, 74ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner public InstVisitor<InstCombiner, Instruction*> { 753574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *TD; 7600737bdb488cc7157ca5f7a40d6cd8467ad09a79Chad Rosier TargetLibraryInfo *TLI; 77ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool MadeIRChange; 785e8904576a5260cfd5b14596e338a4bb25b9817eMeador Inge LibCallSimplifier *Simplifier; 79637582eaf77e6892094cea0bf6b9483f50b5d94eQuentin Colombet bool MinimizeSize; 80ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 81ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// Worklist - All of the instructions that need to be simplified. 82ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner InstCombineWorklist Worklist; 83ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 84ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// Builder - This is an IRBuilder that automatically inserts new 85ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// instructions into the worklist when they are created. 86ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner typedef IRBuilder<true, TargetFolder, InstCombineIRInserter> BuilderTy; 87ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BuilderTy *Builder; 88ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 89ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner static char ID; // Pass identification, replacement for typeid 90081c34b725980f995be9080eaec24cd3dfaaf065Owen Anderson InstCombiner() : FunctionPass(ID), TD(0), Builder(0) { 91637582eaf77e6892094cea0bf6b9483f50b5d94eQuentin Colombet MinimizeSize = false; 92081c34b725980f995be9080eaec24cd3dfaaf065Owen Anderson initializeInstCombinerPass(*PassRegistry::getPassRegistry()); 93081c34b725980f995be9080eaec24cd3dfaaf065Owen Anderson } 94ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 95ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 96ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner virtual bool runOnFunction(Function &F); 97ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 98ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool DoOneIteration(Function &F, unsigned ItNum); 99ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 100e0b4b721aa82796c6ee5cf501ecd85f4974732eeChris Lattner virtual void getAnalysisUsage(AnalysisUsage &AU) const; 10100737bdb488cc7157ca5f7a40d6cd8467ad09a79Chad Rosier 1023574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow DataLayout *getDataLayout() const { return TD; } 103ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 104aab8e28d5e470711d80276bbf717408c3ab966fdChad Rosier TargetLibraryInfo *getTargetLibraryInfo() const { return TLI; } 105aab8e28d5e470711d80276bbf717408c3ab966fdChad Rosier 106ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Visitation implementation - Implement instruction combining for different 107ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // instruction types. The semantics are as follows: 108ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Return Value: 109ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // null - No change was made 110ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // I - Change was made, I is still valid, I may be dead though 111ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // otherwise - Change was made, replace I with returned instruction 112ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 113ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAdd(BinaryOperator &I); 114ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFAdd(BinaryOperator &I); 115db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *OptimizePointerDifference(Value *LHS, Value *RHS, Type *Ty); 116ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSub(BinaryOperator &I); 117ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFSub(BinaryOperator &I); 118ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitMul(BinaryOperator &I); 119ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFMul(BinaryOperator &I); 120ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitURem(BinaryOperator &I); 121ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSRem(BinaryOperator &I); 122ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFRem(BinaryOperator &I); 123ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDivRemOfSelect(BinaryOperator &I); 124ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonRemTransforms(BinaryOperator &I); 125ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonIRemTransforms(BinaryOperator &I); 126ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonDivTransforms(BinaryOperator &I); 127ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonIDivTransforms(BinaryOperator &I); 128ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitUDiv(BinaryOperator &I); 129ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSDiv(BinaryOperator &I); 13031726c154dafa9fef08b1bcac9822c2a4618ec19Frits van Bommel Instruction *visitFDiv(BinaryOperator &I); 131f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner Value *FoldAndOfICmps(ICmpInst *LHS, ICmpInst *RHS); 132f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner Value *FoldAndOfFCmps(FCmpInst *LHS, FCmpInst *RHS); 133ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAnd(BinaryOperator &I); 134f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner Value *FoldOrOfICmps(ICmpInst *LHS, ICmpInst *RHS); 135f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner Value *FoldOrOfFCmps(FCmpInst *LHS, FCmpInst *RHS); 136ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldOrWithConstants(BinaryOperator &I, Value *Op, 137ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *A, Value *B, Value *C); 138ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitOr (BinaryOperator &I); 139ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitXor(BinaryOperator &I); 140ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitShl(BinaryOperator &I); 141ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAShr(BinaryOperator &I); 142ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitLShr(BinaryOperator &I); 143ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonShiftTransforms(BinaryOperator &I); 144ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldFCmp_IntToFP_Cst(FCmpInst &I, Instruction *LHSI, 145ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Constant *RHSC); 146ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldCmpLoadFromIndexedGlobal(GetElementPtrInst *GEP, 147ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner GlobalVariable *GV, CmpInst &ICI, 148ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *AndCst = 0); 149ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFCmpInst(FCmpInst &I); 150ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInst(ICmpInst &I); 151ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInstWithCastAndCast(ICmpInst &ICI); 152ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitICmpInstWithInstAndIntCst(ICmpInst &ICI, 153ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *LHS, 154ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *RHS); 155ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldICmpDivCst(ICmpInst &ICI, BinaryOperator *DivI, 156ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *DivRHS); 15774542aa5001fb6ff3d7d0958b5c391cde63df1caChris Lattner Instruction *FoldICmpShrCst(ICmpInst &ICI, BinaryOperator *DivI, 15874542aa5001fb6ff3d7d0958b5c391cde63df1caChris Lattner ConstantInt *DivRHS); 159ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldICmpAddOpCst(ICmpInst &ICI, Value *X, ConstantInt *CI, 160ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ICmpInst::Predicate Pred, Value *TheAdd); 161ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldGEPICmp(GEPOperator *GEPLHS, Value *RHS, 162ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ICmpInst::Predicate Cond, Instruction &I); 163ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldShiftByConstant(Value *Op0, ConstantInt *Op1, 164ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BinaryOperator &I); 165ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonCastTransforms(CastInst &CI); 166ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *commonPointerCastTransforms(CastInst &CI); 167ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitTrunc(TruncInst &CI); 168ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitZExt(ZExtInst &CI); 169ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSExt(SExtInst &CI); 170ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPTrunc(FPTruncInst &CI); 171ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPExt(CastInst &CI); 172ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPToUI(FPToUIInst &FI); 173ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitFPToSI(FPToSIInst &FI); 174ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitUIToFP(CastInst &CI); 175ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSIToFP(CastInst &CI); 176ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitPtrToInt(PtrToIntInst &CI); 177ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitIntToPtr(IntToPtrInst &CI); 178ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitBitCast(BitCastInst &CI); 179ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSelectOpOp(SelectInst &SI, Instruction *TI, 180ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FI); 181ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSelectIntoOp(SelectInst &SI, Value*, Value*); 182ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldSPFofSPF(Instruction *Inner, SelectPatternFlavor SPF1, 183ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *A, Value *B, Instruction &Outer, 184ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner SelectPatternFlavor SPF2, Value *C); 185ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSelectInst(SelectInst &SI); 186ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSelectInstWithICmp(SelectInst &SI, ICmpInst *ICI); 187ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitCallInst(CallInst &CI); 188ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInvokeInst(InvokeInst &II); 189ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 190ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SliceUpIllegalIntegerPHI(PHINode &PN); 191ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitPHINode(PHINode &PN); 192ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitGetElementPtrInst(GetElementPtrInst &GEP); 193ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitAllocaInst(AllocaInst &AI); 19478f8ef42173a3a9867ed789073d4ddc652fb7ff2Nuno Lopes Instruction *visitAllocSite(Instruction &FI); 195916973706d9b2559c7f88cef8b0f4e40a6450c06Gabor Greif Instruction *visitFree(CallInst &FI); 196ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitLoadInst(LoadInst &LI); 197ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitStoreInst(StoreInst &SI); 198ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitBranchInst(BranchInst &BI); 199ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitSwitchInst(SwitchInst &SI); 200ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInsertElementInst(InsertElementInst &IE); 201ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitExtractElementInst(ExtractElementInst &EI); 202ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitShuffleVectorInst(ShuffleVectorInst &SVI); 203ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitExtractValueInst(ExtractValueInst &EV); 2040ad7b6e773b33f4c4fd3c82c8a5c10ac0597792cDuncan Sands Instruction *visitLandingPadInst(LandingPadInst &LI); 205ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 206ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // visitInstruction - Specify what to return for unhandled instructions... 207ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitInstruction(Instruction &I) { return 0; } 208ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 209ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerprivate: 210db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner bool ShouldChangeType(Type *From, Type *To) const; 21102446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner Value *dyn_castNegVal(Value *V) const; 212d12c27ce0079ba14e73e0c422a30dac68c631a23Chris Lattner Value *dyn_castFNegVal(Value *V) const; 213ece6c6bb6329748b92403c06ac87f45c43485911Chandler Carruth Type *FindElementAtOffset(Type *Ty, int64_t Offset, 21480f43d339f0a5904c62ca6268939c14ab148b94fChris Lattner SmallVectorImpl<Value*> &NewIndices); 21580f43d339f0a5904c62ca6268939c14ab148b94fChris Lattner Instruction *FoldOpIntoSelect(Instruction &Op, SelectInst *SI); 21680f43d339f0a5904c62ca6268939c14ab148b94fChris Lattner 2178c5ad3a5da7419af4d31963c3824836b5da52478Chris Lattner /// ShouldOptimizeCast - Return true if the cast from "V to Ty" actually 2188c5ad3a5da7419af4d31963c3824836b5da52478Chris Lattner /// results in any code being generated and is interesting to optimize out. If 2198c5ad3a5da7419af4d31963c3824836b5da52478Chris Lattner /// the cast can be eliminated by some other simple transformation, we prefer 2208c5ad3a5da7419af4d31963c3824836b5da52478Chris Lattner /// to do the simplification first. 2218c5ad3a5da7419af4d31963c3824836b5da52478Chris Lattner bool ShouldOptimizeCast(Instruction::CastOps opcode,const Value *V, 222db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Type *Ty); 22302446fc99abb06d3117d65c0b1f5fba4f906db2eChris Lattner 224ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *visitCallSite(CallSite CS); 2253574eca1b02600bac4e625297f4ecf745f4c4f32Micah Villmow Instruction *tryOptimizeCall(CallInst *CI, const DataLayout *TD); 226ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool transformConstExprCastCall(CallSite CS); 2274a544a79bd735967f1d33fe675ae4566dbd17813Duncan Sands Instruction *transformCallThroughTrampoline(CallSite CS, 2284a544a79bd735967f1d33fe675ae4566dbd17813Duncan Sands IntrinsicInst *Tramp); 229ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *transformZExtICmp(ICmpInst *ICI, Instruction &CI, 230ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool DoXform = true); 2310a30c42008f88c3fba64127da8d73ba2fcd16fd6Benjamin Kramer Instruction *transformSExtICmp(ICmpInst *ICI, Instruction &CI); 232ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool WillNotOverflowSignedAdd(Value *LHS, Value *RHS); 2335c525b59d5e0036a778d278eeff4832edfd41357Nuno Lopes Value *EmitGEPOffset(User *GEP); 234ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 235ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerpublic: 236ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // InsertNewInstBefore - insert an instruction New before instruction Old 237ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // in the program. Add the new instruction to the worklist. 238ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 239ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *InsertNewInstBefore(Instruction *New, Instruction &Old) { 240ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner assert(New && New->getParent() == 0 && 241ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner "New instruction already inserted into a basic block!"); 242ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BasicBlock *BB = Old.getParent(); 243ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner BB->getInstList().insert(&Old, New); // Insert inst 244ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(New); 245ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return New; 246ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 2476fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman 2486fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman // InsertNewInstWith - same as InsertNewInstBefore, but also sets the 2496fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman // debug loc. 2506fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman // 2516fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman Instruction *InsertNewInstWith(Instruction *New, Instruction &Old) { 2526fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman New->setDebugLoc(Old.getDebugLoc()); 2536fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman return InsertNewInstBefore(New, Old); 2546fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman } 2556fd5a6000bb6d23d6e41f6a8b8d07ad3cca3ea76Eli Friedman 256ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // ReplaceInstUsesWith - This method is to be used when an instruction is 257ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // found to be dead, replacable with another preexisting expression. Here 258ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // we add all uses of I to the worklist, replace all uses of I with the new 259ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // value, then return I, so that the inst combiner will know that I was 260ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // modified. 261ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 262ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *ReplaceInstUsesWith(Instruction &I, Value *V) { 263ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.AddUsersToWorkList(I); // Add all modified instrs to worklist. 264ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 265ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // If we are replacing the instruction with itself, this must be in a 266ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // segment of unreachable code, so just clobber the instruction. 267ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (&I == V) 268ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner V = UndefValue::get(I.getType()); 269f56762a96dbd602f1205ff9e6d1b700d5b4a6c8aFrits van Bommel 270f56762a96dbd602f1205ff9e6d1b700d5b4a6c8aFrits van Bommel DEBUG(errs() << "IC: Replacing " << I << "\n" 271f56762a96dbd602f1205ff9e6d1b700d5b4a6c8aFrits van Bommel " with " << *V << '\n'); 272f56762a96dbd602f1205ff9e6d1b700d5b4a6c8aFrits van Bommel 273ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner I.replaceAllUsesWith(V); 274ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return &I; 275ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 276ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 277ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // EraseInstFromFunction - When dealing with an instruction that has side 278ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // effects or produces a void value, we can't rely on DCE to delete the 279ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // instruction. Instead, visit methods should return the value returned by 280ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // this function. 281ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *EraseInstFromFunction(Instruction &I) { 282ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner DEBUG(errs() << "IC: ERASE " << I << '\n'); 283ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 284ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner assert(I.use_empty() && "Cannot erase instruction that is used!"); 285ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // Make sure that we reprocess all operands now that we reduced their 286ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // use counts. 287ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (I.getNumOperands() < 8) { 288ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner for (User::op_iterator i = I.op_begin(), e = I.op_end(); i != e; ++i) 289ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner if (Instruction *Op = dyn_cast<Instruction>(*i)) 290ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Add(Op); 291ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 292ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Worklist.Remove(&I); 293ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner I.eraseFromParent(); 294ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner MadeIRChange = true; 295ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return 0; // Don't do anything with FI 296ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 297ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 29826c8dcc692fb2addd475446cfff24d6a4e958bcaRafael Espindola void ComputeMaskedBits(Value *V, APInt &KnownZero, 299ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt &KnownOne, unsigned Depth = 0) const { 30026c8dcc692fb2addd475446cfff24d6a4e958bcaRafael Espindola return llvm::ComputeMaskedBits(V, KnownZero, KnownOne, TD, Depth); 301ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 302ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 303ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool MaskedValueIsZero(Value *V, const APInt &Mask, 304ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth = 0) const { 305ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return llvm::MaskedValueIsZero(V, Mask, TD, Depth); 306ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 307ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned ComputeNumSignBits(Value *Op, unsigned Depth = 0) const { 308ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner return llvm::ComputeNumSignBits(Op, TD, Depth); 309ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner } 310ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 311ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattnerprivate: 312ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 313096aa79276b8527a3cbbb3691e40e729dea09523Duncan Sands /// SimplifyAssociativeOrCommutative - This performs a few simplifications for 314096aa79276b8527a3cbbb3691e40e729dea09523Duncan Sands /// operators which are associative or commutative. 315096aa79276b8527a3cbbb3691e40e729dea09523Duncan Sands bool SimplifyAssociativeOrCommutative(BinaryOperator &I); 316ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 31737bf92b5238434b00fde79347ba5336e7554e562Duncan Sands /// SimplifyUsingDistributiveLaws - This tries to simplify binary operations 31837bf92b5238434b00fde79347ba5336e7554e562Duncan Sands /// which some other binary operation distributes over either by factorizing 31937bf92b5238434b00fde79347ba5336e7554e562Duncan Sands /// out common terms (eg "(A*B)+(A*C)" -> "A*(B+C)") or expanding out if this 32037bf92b5238434b00fde79347ba5336e7554e562Duncan Sands /// results in simplifications (eg: "A & (B | C) -> (A&B) | (A&C)" if this is 32137bf92b5238434b00fde79347ba5336e7554e562Duncan Sands /// a win). Returns the simplified value, or null if it didn't simplify. 32237bf92b5238434b00fde79347ba5336e7554e562Duncan Sands Value *SimplifyUsingDistributiveLaws(BinaryOperator &I); 3235057f381418ddc8c96699c40479ead993cd62e7bDuncan Sands 324ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedUseBits - Attempts to replace V with a simpler value 325ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// based on the demanded bits. 326ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *SimplifyDemandedUseBits(Value *V, APInt DemandedMask, 327ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& KnownZero, APInt& KnownOne, 328ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth); 329ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDemandedBits(Use &U, APInt DemandedMask, 330ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& KnownZero, APInt& KnownOne, 331ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner unsigned Depth=0); 332c811976b0400257511f2a255ec70538c3614f85eShuxin Yang /// Helper routine of SimplifyDemandedUseBits. It tries to simplify demanded 333c811976b0400257511f2a255ec70538c3614f85eShuxin Yang /// bit for "r1 = shr x, c1; r2 = shl r1, c2" instruction sequence. 334c811976b0400257511f2a255ec70538c3614f85eShuxin Yang Value *SimplifyShrShlDemandedBits(Instruction *Lsr, Instruction *Sftl, 335c811976b0400257511f2a255ec70538c3614f85eShuxin Yang APInt DemandedMask, APInt &KnownZero, 336c811976b0400257511f2a255ec70538c3614f85eShuxin Yang APInt &KnownOne); 337ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 338ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedInstructionBits - Inst is an integer instruction that 339ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// SimplifyDemandedBits knows about. See if the instruction has any 340ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner /// properties that allow us to simplify its operands. 341ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyDemandedInstructionBits(Instruction &Inst); 342ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 343ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *SimplifyDemandedVectorElts(Value *V, APInt DemandedElts, 344ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner APInt& UndefElts, unsigned Depth = 0); 345ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 346ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // FoldOpIntoPhi - Given a binary operator, cast instruction, or select 347ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // which has a PHI node as operand #0, see if we can fold the instruction 348ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // into the PHI (which is only possible if all operands to the PHI are 349ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // constants). 350ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // 3519922ccf4b483ce37524047879f9b2f9bb73e3ccbChris Lattner Instruction *FoldOpIntoPhi(Instruction &I); 352ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 353ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // FoldPHIArgOpIntoPHI - If all operands to a PHI node are the same "unary" 354ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // operator and they all are only used by the PHI, PHI together their 355ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner // inputs, and do the operation once, to the result of the PHI. 356ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgOpIntoPHI(PHINode &PN); 357ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgBinOpIntoPHI(PHINode &PN); 358ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgGEPIntoPHI(PHINode &PN); 359ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *FoldPHIArgLoadIntoPHI(PHINode &PN); 360ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 361ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 362ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *OptAndOp(Instruction *Op, ConstantInt *OpRHS, 363ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner ConstantInt *AndRHS, BinaryOperator &TheAnd); 364ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 365ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Value *FoldLogicalPlusAnd(Value *LHS, Value *RHS, ConstantInt *Mask, 366ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool isSub, Instruction &I); 367f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner Value *InsertRangeTest(Value *V, Constant *Lo, Constant *Hi, 368f34f48c57870cf4eb4d48e23b11e29b95d1950c3Chris Lattner bool isSigned, bool Inside); 369ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *PromoteCastOfAllocation(BitCastInst &CI, AllocaInst &AI); 370ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *MatchBSwap(BinaryOperator &I); 371ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner bool SimplifyStoreAtEndOfBlock(StoreInst &SI); 372ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SimplifyMemTransfer(MemIntrinsic *MI); 373ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner Instruction *SimplifyMemSet(MemSetInst *MI); 374ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 375ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 376db125cfaf57cc83e7dd7453de2d509bc8efd0e5eChris Lattner Value *EvaluateInDifferentType(Value *V, Type *Ty, bool isSigned); 377bbc7016c60bfe319f4d3bbc525547596e85c9aadDuncan Sands 378bbc7016c60bfe319f4d3bbc525547596e85c9aadDuncan Sands /// Descale - Return a value X such that Val = X * Scale, or null if none. If 379bbc7016c60bfe319f4d3bbc525547596e85c9aadDuncan Sands /// the multiplication is known not to overflow then NoSignedWrap is set. 380bbc7016c60bfe319f4d3bbc525547596e85c9aadDuncan Sands Value *Descale(Value *Val, APInt Scale, bool &NoSignedWrap); 381ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner}; 382ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 383ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 384ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 385ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner} // end namespace llvm. 386ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner 387ac8f2fd2e217d063d7ef57b8698894739f707431Chris Lattner#endif 388