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Fix GlobalOpt to avoid committing a store if the address getelementptr

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is missing the inbounds flag. This is slightly conservative, but it
avoids problems with two constants pointing to the same address but
getting distinct entries in the Memory DenseMap.

llvm-svn: 81163
This commit is contained in:
Dan Gohman 2009-09-07 22:40:13 +00:00
parent e44305a42b
commit f1dd8d2a5b
1 changed files with 2 additions and 1 deletions
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lib/Transforms/IPO/GlobalOpt.cpp
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@ -2032,7 +2032,8 @@ static bool isSimpleEnoughPointerToCommit(Constant *C, LLVMContext &Context) {
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
// Handle a constantexpr gep.
if (CE->getOpcode() == Instruction::GetElementPtr &&
isa<GlobalVariable>(CE->getOperand(0))) {
isa<GlobalVariable>(CE->getOperand(0)) &&
cast<GEPOperator>(CE)->isInBounds()) {
GlobalVariable *GV = cast<GlobalVariable>(CE->getOperand(0));
// Do not allow weak/linkonce/dllimport/dllexport linkage or
// external globals.