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[CallSiteSplitting] Use !Instruction::use_empty instead of checking for a non-zero return from getNumUses

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getNumUses is a linear operation. It walks a linked list to get a count. So in this case its better to just ask if there are any users rather than how many.

llvm-svn: 327314
This commit is contained in:
Craig Topper 2018-03-12 18:40:59 +00:00
parent c700daabdc
commit f7376c55e0
1 changed files with 1 additions and 1 deletions
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lib/Transforms/Scalar/CallSiteSplitting.cpp
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@ -302,7 +302,7 @@ static void splitCallSite(
// `musttail` calls must be followed by optional `bitcast`, and `ret`. The
// split blocks will be terminated right after that so there're no users for
// this phi in a `TailBB`.
if (!IsMustTailCall && Instr->getNumUses())
if (!IsMustTailCall && !Instr->use_empty())
CallPN = PHINode::Create(Instr->getType(), Preds.size(), "phi.call");
DEBUG(dbgs() << "split call-site : " << *Instr << " into \n");