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Fix a bug where we would evaluate stores into linkonce objects which could be

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potentially replaced at link-time.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23463 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-27 04:50:03 +00:00
parent cd27142cc8
commit 231308c545
1 changed files with 6 additions and 1 deletions
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7
lib/Transforms/IPO/GlobalOpt.cpp
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@ -1239,13 +1239,18 @@ static Constant *getVal(std::map<Value*, Constant*> &ComputedValues,
/// we punt. We basically just support direct accesses to globals and GEP's of
/// globals. This should be kept up to date with CommitValueTo.
static bool isSimpleEnoughPointerToCommit(Constant *C) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
if (!GV->hasExternalLinkage() && !GV->hasInternalLinkage())
return false; // do not allow weak/linkonce linkage.
return !GV->isExternal(); // reject external globals.
}
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
// Handle a constantexpr gep.
if (CE->getOpcode() == Instruction::GetElementPtr &&
isa<GlobalVariable>(CE->getOperand(0))) {
GlobalVariable *GV = cast<GlobalVariable>(CE->getOperand(0));
if (!GV->hasExternalLinkage() && !GV->hasInternalLinkage())
return false; // do not allow weak/linkonce linkage.
return GV->hasInitializer() &&
ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE);
}