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Fix a block copying problem in LICM

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Differential Revision: https://reviews.llvm.org/D44817

llvm-svn: 328336
This commit is contained in:
Andrew Kaylor 2018-03-23 17:36:18 +00:00
parent a63fa9f9be
commit 2331dc51e0
1 changed files with 8 additions and 2 deletions
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10
lib/Transforms/Scalar/LICM.cpp
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@ -893,8 +893,14 @@ static void splitPredecessorsOfLoopExit(PHINode *PN, DominatorTree *DT,
// Since we do not allow splitting EH-block with BlockColors in // Since we do not allow splitting EH-block with BlockColors in
// canSplitPredecessors(), we can simply assign predecessor's color to // canSplitPredecessors(), we can simply assign predecessor's color to
// the new block. // the new block.
if (!BlockColors.empty()) if (!BlockColors.empty()) {
BlockColors[NewPred] = BlockColors[PredBB]; // Grab a reference to the ColorVector to be inserted before getting the
// reference to the vector we are copying because inserting the new
// element in BlockColors might cause the map to be reallocated.
ColorVector &ColorsForNewBlock = BlockColors[NewPred];
ColorVector &ColorsForOldBlock = BlockColors[PredBB];
ColorsForNewBlock = ColorsForOldBlock;
}
} }
PredBBs.remove(PredBB); PredBBs.remove(PredBB);
} }