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Add a new API for Nate

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23131 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2005-08-29 21:59:31 +00:00
parent 5e3efbc2ca
commit c26aefa15a
1 changed files with 27 additions and 0 deletions
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27
lib/CodeGen/SelectionDAG/SelectionDAG.cpp
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@ -228,6 +228,33 @@ void SelectionDAG::DeleteNodeIfDead(SDNode *N, void *NodeSet) {
delete N; delete N;
} }
void SelectionDAG::DeleteNode(SDNode *N) {
assert(N->use_empty() && "Cannot delete a node that is not dead!");
// First take this out of the appropriate CSE map.
RemoveNodeFromCSEMaps(N);
// Remove it from the AllNodes list.
for (std::vector<SDNode*>::iterator I = AllNodes.begin(); ; ++I) {
assert(I != AllNodes.end() && "Node not in AllNodes list??");
if (*I == N) {
// Erase from the vector, which is not ordered.
std::swap(*I, AllNodes.back());
AllNodes.pop_back();
break;
}
}
// Drop all of the operands and decrement used nodes use counts.
while (!N->Operands.empty()) {
SDNode *O = N->Operands.back().Val;
N->Operands.pop_back();
O->removeUser(N);
}
delete N;
}
/// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that /// RemoveNodeFromCSEMaps - Take the specified node out of the CSE map that
/// correspond to it. This is useful when we're about to delete or repurpose /// correspond to it. This is useful when we're about to delete or repurpose
/// the node. We don't want future request for structurally identical nodes /// the node. We don't want future request for structurally identical nodes