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I was confused about this, it turns out that MorphNodeTo

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*does* delete ex-operands that become dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97559 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2010-03-02 07:14:49 +00:00
parent 3ff1e4db78
commit 61c97f6932
1 changed files with 2 additions and 3 deletions
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5
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -1770,9 +1770,8 @@ MorphNode(SDNode *Node, unsigned TargetOpc, SDVTList VTList,
} else if (Node->getValueType(NTMNumResults-1) == MVT::Other)
OldChainResultNo = NTMNumResults-1;
// FIXME: If this matches multiple nodes it will just leave them here
// dead with noone to love them. These dead nodes can block future
// matches (!).
// Call the underlying SelectionDAG routine to do the transmogrification. Note
// that this deletes operands of the old node that become dead.
SDNode *Res = CurDAG->MorphNodeTo(Node, ~TargetOpc, VTList, Ops, NumOps);
// MorphNodeTo can operate in two ways: if an existing node with the