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

llvm-svn: 150978
This commit is contained in:
Benjamin Kramer 2012-02-20 18:45:10 +00:00
parent 66562a4a54
commit ac8ecc4e7e
1 changed files with 1 additions and 1 deletions
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2
llvm/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 // 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 // and both GEPs have only constant indices or just one use, then fold
// the compare with the adjusted indices. // the compare with the adjusted indices.
if (TD && if (TD && GEPLHS->isInBounds() && GEPRHS->isInBounds() &&
(GEPLHS->hasAllConstantIndices() || GEPLHS->hasOneUse()) && (GEPLHS->hasAllConstantIndices() || GEPLHS->hasOneUse()) &&
(GEPRHS->hasAllConstantIndices() || GEPRHS->hasOneUse()) && (GEPRHS->hasAllConstantIndices() || GEPRHS->hasOneUse()) &&
PtrBase->stripPointerCasts() == PtrBase->stripPointerCasts() ==