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Implement a proper getModRefInfo for va_arg.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110458 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-06 18:24:38 +00:00
parent e6f60645c7
commit e26a7b5e21
3 changed files with 29 additions and 4 deletions
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17
lib/Analysis/AliasAnalysis.cpp
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@@ -229,6 +229,23 @@ AliasAnalysis::getModRefInfo(const StoreInst *S, const Value *P, unsigned Size)
return Mod;
}
AliasAnalysis::ModRefResult
AliasAnalysis::getModRefInfo(const VAArgInst *V, const Value *P, unsigned Size) {
// If the va_arg address cannot alias the pointer in question, then the
// specified memory cannot be accessed by the va_arg.
if (!alias(V->getOperand(0), UnknownSize, P, Size))
return NoModRef;
// If the pointer is a pointer to constant memory, then it could not have been
// modified by this va_arg.
if (pointsToConstantMemory(P))
return NoModRef;
// Otherwise, a va_arg reads and writes.
return ModRef;
}
AliasAnalysis::ModRefBehavior
AliasAnalysis::getIntrinsicModRefBehavior(unsigned iid) {
#define GET_INTRINSIC_MODREF_BEHAVIOR