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Don't implement AliasSetTracker::remove in terms of deleteValue. deleteValue

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causes the pointer to be removed from the underlying alias analysis
implementation as well.  This impl of remove is also significantly faster than
the old one.  This fixes:
Regression/Transforms/DeadStoreElimination/2006-06-27-AST-Remove.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28950 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2006-06-27 23:48:59 +00:00
parent 4ba6bf7458
commit f299857496
1 changed files with 21 additions and 9 deletions
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30
lib/Analysis/AliasSetTracker.cpp
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@ -359,16 +359,28 @@ void AliasSetTracker::add(const AliasSetTracker &AST) {
/// remove - Remove the specified (potentially non-empty) alias set from the
/// tracker.
void AliasSetTracker::remove(AliasSet &AS) {
bool SetDead;
do {
AliasSet::iterator I = AS.begin();
Value *Ptr = I.getPointer(); ++I;
// Drop all call sites.
AS.CallSites.clear();
// deleteValue will delete the set automatically when the last pointer
// reference is destroyed. "Predict" when this will happen.
SetDead = I == AS.end();
deleteValue(Ptr); // Delete all of the pointers from the set
} while (!SetDead);
// Clear the alias set.
unsigned NumRefs = 0;
while (!AS.empty()) {
AliasSet::HashNodePair *P = AS.PtrList;
// Unlink from the list of values.
P->second.removeFromList();
// Remember how many references need to be dropped.
++NumRefs;
// Finally, remove the entry.
PointerMap.erase(P->first);
}
// Stop using the alias set, removing it.
assert(AS.RefCount == NumRefs);
AS.RefCount = 0;
AS.removeFromTracker(*this);
}
bool AliasSetTracker::remove(Value *Ptr, unsigned Size) {