本文整理汇总了C++中IntrinsicInst::users方法的典型用法代码示例。如果您正苦于以下问题：C++ IntrinsicInst::users方法的具体用法？C++ IntrinsicInst::users怎么用？C++ IntrinsicInst::users使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类IntrinsicInst的用法示例。
在下文中一共展示了IntrinsicInst::users方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: if
/// \brief Split sadd.with.overflow into add + sadd.with.overflow to allow
/// analysis and optimization.
///
/// \return A new value representing the non-overflowing add if possible,
/// otherwise return the original value.
Instruction *SimplifyIndvar::splitOverflowIntrinsic(Instruction *IVUser,
const DominatorTree *DT) {
IntrinsicInst *II = dyn_cast<IntrinsicInst>(IVUser);
if (!II || II->getIntrinsicID() != Intrinsic::sadd_with_overflow)
return IVUser;
// Find a branch guarded by the overflow check.
BranchInst *Branch = nullptr;
Instruction *AddVal = nullptr;
for (User *U : II->users()) {
if (ExtractValueInst *ExtractInst = dyn_cast<ExtractValueInst>(U)) {
if (ExtractInst->getNumIndices() != 1)
continue;
if (ExtractInst->getIndices()[0] == 0)
AddVal = ExtractInst;
else if (ExtractInst->getIndices()[0] == 1 && ExtractInst->hasOneUse())
Branch = dyn_cast<BranchInst>(ExtractInst->user_back());
}
}
if (!AddVal || !Branch)
return IVUser;
BasicBlock *ContinueBB = Branch->getSuccessor(1);
if (std::next(pred_begin(ContinueBB)) != pred_end(ContinueBB))
return IVUser;
// Check if all users of the add are provably NSW.
bool AllNSW = true;
for (Use &U : AddVal->uses()) {
if (Instruction *UseInst = dyn_cast<Instruction>(U.getUser())) {
BasicBlock *UseBB = UseInst->getParent();
if (PHINode *PHI = dyn_cast<PHINode>(UseInst))
UseBB = PHI->getIncomingBlock(U);
if (!DT->dominates(ContinueBB, UseBB)) {
AllNSW = false;
break;
}
}
}
if (!AllNSW)
return IVUser;
// Go for it...
IRBuilder<> Builder(IVUser);
Instruction *AddInst = dyn_cast<Instruction>(
Builder.CreateNSWAdd(II->getOperand(0), II->getOperand(1)));
// The caller expects the new add to have the same form as the intrinsic. The
// IV operand position must be the same.
assert((AddInst->getOpcode() == Instruction::Add &&
AddInst->getOperand(0) == II->getOperand(0)) &&
"Bad add instruction created from overflow intrinsic.");
AddVal->replaceAllUsesWith(AddInst);
DeadInsts.emplace_back(AddVal);
return AddInst;
}