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Move onlyUsedByLifetimeMarkers to ValueTracking so that it can be used by other

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passes as well.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133904 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-06-27 04:20:45 +00:00
parent 1baeb006d2
commit 99e0b2a8df
3 changed files with 21 additions and 16 deletions
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16
lib/Analysis/ValueTracking.cpp
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@ -1783,3 +1783,19 @@ llvm::GetUnderlyingObject(Value *V, const TargetData *TD, unsigned MaxLookup) {
}
return V;
}
/// onlyUsedByLifetimeMarkers - Return true if the only users of this pointer
/// are lifetime markers.
///
bool llvm::onlyUsedByLifetimeMarkers(const Value *V) {
for (Value::const_use_iterator UI = V->use_begin(), UE = V->use_end();
UI != UE; ++UI) {
const IntrinsicInst *II = dyn_cast<IntrinsicInst>(*UI);
if (!II) return false;
if (II->getIntrinsicID() != Intrinsic::lifetime_start &&
II->getIntrinsicID() != Intrinsic::lifetime_end)
return false;
}
return true;
}