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resolve a fixme. I haven't figured out how to write a testcase

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to exercise this though.

llvm-svn: 89954
This commit is contained in:
Chris Lattner 2009-11-26 16:52:32 +00:00
parent 993cb8c911
commit 62a36a703c
1 changed files with 4 additions and 5 deletions
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9
lib/Analysis/BasicAliasAnalysis.cpp
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@ -400,7 +400,7 @@ static Value *GetLinearExpression(Value *V, APInt &Scale, APInt &Offset,
V = GetLinearExpression(BOp->getOperand(0), Scale, Offset, TD); V = GetLinearExpression(BOp->getOperand(0), Scale, Offset, TD);
Offset += RHSC->getValue(); Offset += RHSC->getValue();
return V; return V;
// TODO: SHL, MUL, OR. // TODO: SHL, MUL.
} }
} }
} }
@ -610,10 +610,9 @@ BasicAliasAnalysis::aliasGEP(const GEPOperator *GEP1, unsigned V1Size,
// Check to see if these two pointers are related by the getelementptr // Check to see if these two pointers are related by the getelementptr
// instruction. If one pointer is a GEP with a non-zero index of the other // instruction. If one pointer is a GEP with a non-zero index of the other
// pointer, we know they cannot alias. // pointer, we know they cannot alias.
//
// FIXME: The check below only looks at the size of one of the pointers, not // If both accesses are unknown size, we can't do anything useful here.
// both, this may cause us to miss things. if (V1Size == ~0U && V2Size == ~0U)
if (V1Size == ~0U || V2Size == ~0U)
return MayAlias; return MayAlias;
AliasResult R = aliasCheck(UnderlyingV1, ~0U, V2, V2Size); AliasResult R = aliasCheck(UnderlyingV1, ~0U, V2, V2Size);