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InstCombine: Removing the base from the address calculation is only safe when the GEPs are inbounds.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150978 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer 2012-02-20 18:45:10 +00:00
parent 1c7f744bbb
commit 6ad48f4137
1 changed files with 1 additions and 1 deletions
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lib/Transforms/InstCombine/InstCombineCompares.cpp
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@ -610,7 +610,7 @@ Instruction *InstCombiner::FoldGEPICmp(GEPOperator *GEPLHS, Value *RHS,
// If we're comparing GEPs with two base pointers that only differ in type
// and both GEPs have only constant indices or just one use, then fold
// the compare with the adjusted indices.
if (TD &&
if (TD && GEPLHS->isInBounds() && GEPRHS->isInBounds() &&
(GEPLHS->hasAllConstantIndices() || GEPLHS->hasOneUse()) &&
(GEPRHS->hasAllConstantIndices() || GEPRHS->hasOneUse()) &&
PtrBase->stripPointerCasts() ==