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| author | Jakub Staszak <kubastaszak@gmail.com> | 2012-10-04 19:08:30 +0000 |
|---|---|---|
| committer | Jakub Staszak <kubastaszak@gmail.com> | 2012-10-04 19:08:30 +0000 |
| commit | eb51e95e61bd93cb764e14cdd5f0271e237e4673 (patch) | |
| tree | 1e7aa40df328b028174499056a2d86b16914cc25 /lib/Transforms/Scalar/IndVarSimplify.cpp | |
| parent | 916381569aa5cd33e4ed4c1585f48cf5da1a6684 (diff) | |
| download | llvm-eb51e95e61bd93cb764e14cdd5f0271e237e4673.tar.gz llvm-eb51e95e61bd93cb764e14cdd5f0271e237e4673.tar.bz2 llvm-eb51e95e61bd93cb764e14cdd5f0271e237e4673.tar.xz | |
Add a comment to the commit r165187.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165238 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/IndVarSimplify.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/IndVarSimplify.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp index 23d0bb51b3..af0ee34d0d 100644 --- a/lib/Transforms/Scalar/IndVarSimplify.cpp +++ b/lib/Transforms/Scalar/IndVarSimplify.cpp @@ -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); } |