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Diffstat (limited to 'lib/Transforms/Scalar/LoopIndexSplit.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/LoopIndexSplit.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/LoopIndexSplit.cpp b/lib/Transforms/Scalar/LoopIndexSplit.cpp index da6f076a9a..a6bd9ff20a 100644 --- a/lib/Transforms/Scalar/LoopIndexSplit.cpp +++ b/lib/Transforms/Scalar/LoopIndexSplit.cpp @@ -1124,6 +1124,11 @@ bool LoopIndexSplit::safeSplitCondition(SplitInfo &SD) { BasicBlock *Succ0 = SplitTerminator->getSuccessor(0); BasicBlock *Succ1 = SplitTerminator->getSuccessor(1); + // If split block does not dominate the latch then this is not a diamond. + // Such loop may not benefit from index split. + if (!DT->dominates(SplitCondBlock, Latch)) + return false; + // Finally this split condition is safe only if merge point for // split condition branch is loop latch. This check along with previous // check, to ensure that exit condition is in either loop latch or header, |