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[SROA] Fix the loop exit placement to be prior to indexing the splits

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array. This prevents it from walking out of bounds on the splits array.

Bug found with the existing tests by ASan and by the MSVC debug build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2015-01-02 00:10:22 +00:00
parent ed3f2c6761
commit 987c1f8ee7
1 changed files with 8 additions and 4 deletions
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12
lib/Transforms/Scalar/SROA.cpp
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@ -3706,11 +3706,13 @@ bool SROA::presplitLoadsAndStores(AllocaInst &AI, AllocaSlices &AS) {
<< ", " << NewSlices.back().endOffset() << "): " << *PLoad
<< "\n");
// See if we've handled all the splits.
if (Idx >= Size)
break;
// Setup the next partition.
PartOffset = Offsets.Splits[Idx];
++Idx;
if (Idx > Size)
break;
PartSize = (Idx < Size ? Offsets.Splits[Idx] : LoadSize) - PartOffset;
}
@ -3845,11 +3847,13 @@ bool SROA::presplitLoadsAndStores(AllocaInst &AI, AllocaSlices &AS) {
DEBUG(dbgs() << " of split load: " << *PLoad << "\n");
}
// See if we've finished all the splits.
if (Idx >= Size)
break;
// Setup the next partition.
PartOffset = Offsets.Splits[Idx];
++Idx;
if (Idx > Size)
break;
PartSize = (Idx < Size ? Offsets.Splits[Idx] : StoreSize) - PartOffset;
}