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Add a comment to the commit r165187.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165238 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakub Staszak 2012-10-04 19:08:30 +00:00
parent 916381569a
commit eb51e95e61
1 changed files with 3 additions and 1 deletions
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4
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -1261,10 +1261,12 @@ static bool needsLFTR(Loop *L, DominatorTree *DT) {
if (!Phi)
return true;
// Do LFTR if the exit condition's IV is *not* a simple counter.
// Do LFTR if PHI node is defined in the loop, but is *not* a counter.
int Idx = Phi->getBasicBlockIndex(L->getLoopLatch());
if (Idx < 0)
return true;
// Do LFTR if the exit condition's IV is *not* a simple counter.
Value *IncV = Phi->getIncomingValue(Idx);
return Phi != getLoopPhiForCounter(IncV, L, DT);
}