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Use PartialAlias to do better noalias lint checking. 

llvm-svn: 121514
This commit is contained in:
Dan Gohman 2010-12-10 20:04:06 +00:00
parent 4431e31df0
commit 201acdb6db
1 changed files with 6 additions and 4 deletions
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10
llvm/lib/Analysis/Lint.cpp
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@ -232,10 +232,12 @@ void Lint::visitCallSite(CallSite CS) {
// where nothing is known.
if (Formal->hasNoAliasAttr() && Actual->getType()->isPointerTy())
for (CallSite::arg_iterator BI = CS.arg_begin(); BI != AE; ++BI)
Assert1(AI == BI ||
!(*BI)->getType()->isPointerTy() ||
AA->alias(*AI, *BI) != AliasAnalysis::MustAlias,
"Unusual: noalias argument aliases another argument", &I);
if (AI != BI && (*BI)->getType()->isPointerTy()) {
AliasAnalysis::AliasResult Result = AA->alias(*AI, *BI);
Assert1(Result != AliasAnalysis::MustAlias &&
Result != AliasAnalysis::PartialAlias,
"Unusual: noalias argument aliases another argument", &I);
}
// Check that an sret argument points to valid memory.
if (Formal->hasStructRetAttr() && Actual->getType()->isPointerTy()) {