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Fix a memory corruption in Dependency Analysis.

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This crash occurs due to memory corruption when trying to update dependency
direction based on Constraints.

This crash was observed during lnt regression of Polybench benchmark test case dynprog.

Review: http://reviews.llvm.org/D8059



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231788 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Karthik Bhat
2015-03-10 14:32:02 +00:00
parent 57f42270e5
commit 36b589fd8a
2 changed files with 105 additions and 0 deletions
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2
lib/Analysis/DependenceAnalysis.cpp
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@@ -3651,6 +3651,8 @@ DependenceAnalysis::depends(Instruction *Src, Instruction *Dst,
DEBUG(dbgs() << " updating\n");
for (int SJ = ConstrainedLevels.find_first(); SJ >= 0;
SJ = ConstrainedLevels.find_next(SJ)) {
if (SJ > (int)CommonLevels)
break;
updateDirection(Result.DV[SJ - 1], Constraints[SJ]);
if (Result.DV[SJ - 1].Direction == Dependence::DVEntry::NONE)
return nullptr;