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Implement GlobalOpt/deadglobal-2.llx, deletion of globals that are only

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stored to, but are stored at variable indexes.  This occurs at least in
176.gcc, but probably others, and we should handle it for completeness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16876 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-10-10 16:47:33 +00:00
parent ba31f8098f
commit c4d81b0388
1 changed files with 11 additions and 0 deletions
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11
lib/Transforms/IPO/GlobalOpt.cpp
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@ -259,6 +259,17 @@ static bool CleanupConstantGlobalUsers(Value *V, Constant *Init) {
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(U)) {
if (Constant *SubInit = TraverseGEPInitializer(GEP, Init))
Changed |= CleanupConstantGlobalUsers(GEP, SubInit);
else {
// If this GEP has variable indexes, we should still be able to delete
// any stores through it.
for (Value::use_iterator GUI = GEP->use_begin(), E = GEP->use_end();
GUI != E;)
if (StoreInst *SI = dyn_cast<StoreInst>(*GUI++)) {
SI->getParent()->getInstList().erase(SI);
Changed = true;
}
}
if (GEP->use_empty()) {
GEP->getParent()->getInstList().erase(GEP);
Changed = true;