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do not dereference an extra layer of pointers to determine if an external

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call can modify a memory location.  This fixes
test/Regression/Analysis/Andersens/modreftest.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21088 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-04 22:23:21 +00:00
parent 7759adfb4d
commit 8a9763c3cd
1 changed files with 5 additions and 12 deletions
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17
lib/Analysis/IPA/Andersens.cpp
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@ -374,19 +374,12 @@ Andersens::getModRefInfo(CallSite CS, Value *P, unsigned Size) {
Node *N1 = getNode(P);
bool PointsToUniversalSet = false;
for (Node::iterator NI = N1->begin(), E = N1->end(); NI != E; ++NI) {
Node *PN = *NI;
if (PN->begin() == PN->end())
continue; // P doesn't point to anything.
// Get the first pointee.
Node *FirstPointee = *PN->begin();
if (FirstPointee == &GraphNodes[UniversalSet]) {
PointsToUniversalSet = true;
break;
}
}
if (N1->begin() == N1->end())
return NoModRef; // P doesn't point to anything.
if (!PointsToUniversalSet)
// Get the first pointee.
Node *FirstPointee = *N1->begin();
if (FirstPointee != &GraphNodes[UniversalSet])
return NoModRef; // P doesn't point to the universal set.
}