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fix PR8895: metadata operands don't have a strong use of their

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nested values, so they can change and drop to null, which can
change the hash and cause havok.

It turns out that it isn't a good idea to value number stuff
with metadata operands anyway, so... don't.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122758 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2011-01-03 18:28:15 +00:00
parent 18d4987753
commit a12ba39a1d
1 changed files with 10 additions and 4 deletions
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14
lib/Transforms/Scalar/EarlyCSE.cpp
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@ -145,9 +145,15 @@ namespace {
}
static bool canHandle(Instruction *Inst) {
if (CallInst *CI = dyn_cast<CallInst>(Inst))
return CI->onlyReadsMemory();
return false;
CallInst *CI = dyn_cast<CallInst>(Inst);
if (CI == 0 || !CI->onlyReadsMemory())
return false;
// Check that there are no metadata operands.
for (unsigned i = 0, e = CI->getNumOperands(); i != e; ++i)
if (CI->getOperand(i)->getType()->isMetadataTy())
return false;
return true;
}
};
}
@ -407,7 +413,7 @@ bool EarlyCSE::processNode(DomTreeNode *Node) {
if (LastStore &&
LastStore->getPointerOperand() == SI->getPointerOperand()) {
DEBUG(dbgs() << "EarlyCSE DEAD STORE: " << *LastStore << " due to: "
<< *Inst << '\n');
<< *Inst << '\n');
LastStore->eraseFromParent();
Changed = true;
++NumDSE;