78     Value *foldIVUser(Instruction *UseInst, Instruction *IVOperand);
80     bool eliminateIdentitySCEV(Instruction *UseInst, Instruction *IVOperand);
81     bool replaceIVUserWithLoopInvariant(Instruction *UseInst);
82     bool replaceFloatIVWithIntegerIV(Instruction *UseInst);
87     bool eliminateIVUser(Instruction *UseInst, Instruction *IVOperand);
128 Value *SimplifyIndvar::foldIVUser(Instruction *UseInst, Instruction *IVOperand) {  in foldIVUser()  argument
133   switch (UseInst->getOpcode()) {  in foldIVUser()
140     if (IVOperand != UseInst->getOperand(OperIdx) ||  in foldIVUser()
141         !isa<ConstantInt>(UseInst->getOperand(1)))  in foldIVUser()
154     ConstantInt *D = cast<ConstantInt>(UseInst->getOperand(1));  in foldIVUser()
155     if (UseInst->getOpcode() == Instruction::LShr) {  in foldIVUser()
157       uint32_t BitWidth = cast<IntegerType>(UseInst->getType())->getBitWidth();  in foldIVUser()
161       D = ConstantInt::get(UseInst->getContext(),  in foldIVUser()
169     if (UseInst->isExact() && LHS != SE->getMulExpr(FoldedExpr, RHS))  in foldIVUser()
173   if (!SE->isSCEVable(UseInst->getType()))  in foldIVUser()
177   if (SE->getSCEV(UseInst) != FoldedExpr)  in foldIVUser()
181                     << " -> " << *UseInst << '\n');  in foldIVUser()
183   UseInst->setOperand(OperIdx, IVSrc);  in foldIVUser()
184   assert(SE->getSCEV(UseInst) == FoldedExpr && "bad SCEV with folded oper");  in foldIVUser()
187     UseInst->dropPoisonGeneratingFlags();  in foldIVUser()
604 bool SimplifyIndvar::eliminateIVUser(Instruction *UseInst,  in eliminateIVUser()  argument
606   if (ICmpInst *ICmp = dyn_cast<ICmpInst>(UseInst)) {  in eliminateIVUser()
610   if (BinaryOperator *Bin = dyn_cast<BinaryOperator>(UseInst)) {  in eliminateIVUser()
621   if (auto *WO = dyn_cast<WithOverflowInst>(UseInst))  in eliminateIVUser()
625   if (auto *SI = dyn_cast<SaturatingInst>(UseInst))  in eliminateIVUser()
629   if (auto *TI = dyn_cast<TruncInst>(UseInst))  in eliminateIVUser()
633   if (eliminateIdentitySCEV(UseInst, IVOperand))  in eliminateIVUser()
681 bool SimplifyIndvar::replaceFloatIVWithIntegerIV(Instruction *UseInst) {  in replaceFloatIVWithIntegerIV()  argument
682   if (UseInst->getOpcode() != CastInst::SIToFP &&  in replaceFloatIVWithIntegerIV()
683       UseInst->getOpcode() != CastInst::UIToFP)  in replaceFloatIVWithIntegerIV()
686   Value *IVOperand = UseInst->getOperand(0);  in replaceFloatIVWithIntegerIV()
690   if (UseInst->getOpcode() == CastInst::SIToFP)  in replaceFloatIVWithIntegerIV()
694   unsigned DestNumSigBits = UseInst->getType()->getFPMantissaWidth();  in replaceFloatIVWithIntegerIV()
696     for (User *U : UseInst->users()) {  in replaceFloatIVWithIntegerIV()
720 bool SimplifyIndvar::eliminateIdentitySCEV(Instruction *UseInst,  in eliminateIdentitySCEV()  argument
722   if (!SE->isSCEVable(UseInst->getType()) ||  in eliminateIdentitySCEV()
723       (UseInst->getType() != IVOperand->getType()) ||  in eliminateIdentitySCEV()
724       (SE->getSCEV(UseInst) != SE->getSCEV(IVOperand)))  in eliminateIdentitySCEV()
743   if (isa<PHINode>(UseInst))  in eliminateIdentitySCEV()
746     if (!DT || !DT->dominates(IVOperand, UseInst))  in eliminateIdentitySCEV()
749   if (!LI->replacementPreservesLCSSAForm(UseInst, IVOperand))  in eliminateIdentitySCEV()
752   LLVM_DEBUG(dbgs() << "INDVARS: Eliminated identity: " << *UseInst << '\n');  in eliminateIdentitySCEV()
754   UseInst->replaceAllUsesWith(IVOperand);  in eliminateIdentitySCEV()
757   DeadInsts.emplace_back(UseInst);  in eliminateIdentitySCEV()
893     Instruction *UseInst = UseOper.first;  in simplifyUsers()  local
899     if (isInstructionTriviallyDead(UseInst, /* TLI */ nullptr)) {  in simplifyUsers()
900       DeadInsts.emplace_back(UseInst);  in simplifyUsers()
905     if (UseInst == CurrIV) continue;  in simplifyUsers()
909     if (replaceIVUserWithLoopInvariant(UseInst))  in simplifyUsers()
917       Value *NewOper = foldIVUser(UseInst, IVOperand);  in simplifyUsers()
925     if (eliminateIVUser(UseInst, IVOperand)) {  in simplifyUsers()
930     if (BinaryOperator *BO = dyn_cast<BinaryOperator>(UseInst)) {  in simplifyUsers()
941     if (replaceFloatIVWithIntegerIV(UseInst)) {  in simplifyUsers()
947     CastInst *Cast = dyn_cast<CastInst>(UseInst);  in simplifyUsers()
952     if (isSimpleIVUser(UseInst, L, SE)) {  in simplifyUsers()
953       pushIVUsers(UseInst, L, Simplified, SimpleIVUsers);  in simplifyUsers()