Transforms/Scalar/IndVarSimplify.cpp

241 void IndVarSimplify::HandleFloatingPointIV(Loop *L, PHINode *PN) {
242   unsigned IncomingEdge = L->contains(PN->getIncomingBlock(0));
247     dyn_cast<ConstantFP>(PN->getIncomingValue(IncomingEdge));
253   // Check IV increment. Reject this PN if increment operation is not
256     dyn_cast<BinaryOperator>(PN->getIncomingValue(BackEdge));
263   if (IncValueVal == 0 || Incr->getOperand(0) != PN ||
267   // Check Incr uses. One user is PN and the other user is an exit condition
393   IntegerType *Int32Ty = Type::getInt32Ty(PN->getContext());
396   PHINode *NewPHI = PHINode::Create(Int32Ty, 2, PN->getName()+".int", PN);
398                       PN->getIncomingBlock(IncomingEdge));
403   NewPHI->addIncoming(NewAdd, PN->getIncomingBlock(BackEdge));
409   // In the following deletions, PN may become dead and may be deleted.
411   WeakVH WeakPH = PN;
431     Value *Conv = new SIToFPInst(NewPHI, PN->getType(), "indvar.conv",
432                                  PN->getParent()->getFirstInsertionPt());
433     PN->replaceAllUsesWith(Conv);
434     RecursivelyDeleteTriviallyDeadInstructions(PN, TLI);
448        PHINode *PN = dyn_cast<PHINode>(I); ++I)
449     PHIs.push_back(PN);
452     if (PHINode *PN = dyn_cast_or_null<PHINode>(&*PHIs[i]))
453       HandleFloatingPointIV(L, PN);
492     PHINode *PN = dyn_cast<PHINode>(ExitBB->begin());
493     if (!PN) continue;
495     unsigned NumPreds = PN->getNumIncomingValues();
499     while ((PN = dyn_cast<PHINode>(BBI++))) {
500       if (PN->use_empty())
504       if (!PN->getType()->isIntegerTy() && !PN->getType()->isPointerTy())
512       SE->forgetValue(PN);
518         Value *InVal = PN->getIncomingValue(i);
523         if (LI->getLoopFor(PN->getIncomingBlock(i)) != L)
578         Value *ExitVal = Rewriter.expandCodeFor(ExitValue, PN->getType(), Inst);
590         PN->setIncomingValue(i, ExitVal);
601           PN->replaceAllUsesWith(ExitVal);
602           PN->eraseFromParent();
608         PHINode *NewPN = cast<PHINode>(PN->clone());
609         NewPN->takeName(PN);
610         NewPN->insertBefore(PN);
611         PN->replaceAllUsesWith(NewPN);
612         PN->eraseFromParent();