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[RewriteStatepointsForGC] Update comment for same PHI node check. NFC

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@280052 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Anna Thomas 2016-08-30 02:36:48 +00:00
parent 9e15636d69
commit 23b4641779
1 changed files with 2 additions and 1 deletions
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lib/Transforms/Scalar/RewriteStatepointsForGC.cpp
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@ -1805,7 +1805,8 @@ static bool findRematerializableChainToBasePointer(
// conflict, and hence an additional phi with the same incoming values get
// generated. We need to identify the BaseValue (.base version of phi) and
// CurrentValue (the phi node itself) as the same, so that we can
// rematerialize the gep and casts below.
// rematerialize the gep and casts below. This is a workaround for the
// deficieny in the findBasePointer algorithm.
if (PHINode *CurrentPhi = dyn_cast<PHINode>(CurrentValue))
if (PHINode *BasePhi = dyn_cast<PHINode>(BaseValue)) {
auto PhiNum = CurrentPhi->getNumIncomingValues();