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Move isKnownNonNull from private implementation detail of BasicAA to a public

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function that others can use, next to llvm::isIdentifiedObject.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151446 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2012-02-25 10:56:28 +00:00
parent 1d05c215dd
commit 55f4ab84e5
3 changed files with 21 additions and 16 deletions
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16
lib/Analysis/AliasAnalysis.cpp
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@@ -440,3 +440,19 @@ bool llvm::isIdentifiedObject(const Value *V) {
return A->hasNoAliasAttr() || A->hasByValAttr();
return false;
}
/// isKnownNonNull - Return true if we know that the specified value is never
/// null.
bool llvm::isKnownNonNull(const Value *V) {
// Alloca never returns null, malloc might.
if (isa<AllocaInst>(V)) return true;
// A byval argument is never null.
if (const Argument *A = dyn_cast<Argument>(V))
return A->hasByValAttr();
// Global values are not null unless extern weak.
if (const GlobalValue *GV = dyn_cast<GlobalValue>(V))
return !GV->hasExternalWeakLinkage();
return false;
}