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[LoopUnroll] Use undef for phis with no value live

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We would create a phi node with a zero initialized operand instead of
undef in the case where no value was originally available.  This was
problematic for x86_mmx which has no null value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241143 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Majnemer
2015-07-01 05:38:07 +00:00
parent 284c49c36f
commit 787b9b4e95
2 changed files with 25 additions and 1 deletions
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2
lib/Transforms/Utils/LoopUnrollRuntime.cpp
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@ -86,7 +86,7 @@ static void ConnectProlog(Loop *L, Value *BECount, unsigned Count,
if (L->contains(PN)) {
NewPN->addIncoming(PN->getIncomingValueForBlock(NewPH), OrigPH);
} else {
NewPN->addIncoming(Constant::getNullValue(PN->getType()), OrigPH);
NewPN->addIncoming(UndefValue::get(PN->getType()), OrigPH);
}
Value *V = PN->getIncomingValueForBlock(Latch);