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When an MDNode changes to become identical to another MDNode,

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delete the MDNode that changed, rather than the other MDNode.
This is less work, because it doesn't require the changed node
to be re-inserted into the uniquing map and it doesn't require
the is-function-local flag to be recomputed. Also, it avoids
trouble when the existing node is part of a complicated
data structure.

llvm-svn: 114996
This commit is contained in:
Dan Gohman 2010-09-28 22:07:19 +00:00
parent c34e1296b8
commit 898f765c13
1 changed files with 4 additions and 5 deletions
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9
lib/VMCore/Metadata.cpp
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@ -339,15 +339,14 @@ void MDNode::replaceOperand(MDNodeOperand *Op, Value *To) {
// Now that the node is out of the folding set, get ready to reinsert it.
// First, check to see if another node with the same operands already exists
// in the set. If it doesn't exist, this returns the position to insert it.
// in the set. If so, then this node is redundant.
FoldingSetNodeID ID;
Profile(ID);
void *InsertPoint;
if (MDNode *N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint)) {
N->replaceAllUsesWith(this);
N->destroy();
N = pImpl->MDNodeSet.FindNodeOrInsertPos(ID, InsertPoint);
assert(N == 0 && "shouldn't be in the map now!"); (void)N;
replaceAllUsesWith(N);
destroy();
return;
}
// InsertPoint will have been set by the FindNodeOrInsertPos call.