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Porting r50563 from Tak to mainline.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50564 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-05-02 00:43:20 +00:00
parent 7ceda160b3
commit 643310da6d
1 changed files with 5 additions and 0 deletions

5
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,