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| author | Chris Lattner <sabre@nondot.org> | 2010-03-02 07:14:49 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2010-03-02 07:14:49 +0000 |
| commit | ad7c0f5649d9cee42bd54e02b817316dddb8db80 (patch) | |
| tree | f0ad985f9f00fb0121e70eeb53516e80def1f39d /lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | |
| parent | ad0310618a87ee72b74b75b1960603169e9f087d (diff) | |
| download | external_llvm-ad7c0f5649d9cee42bd54e02b817316dddb8db80.zip external_llvm-ad7c0f5649d9cee42bd54e02b817316dddb8db80.tar.gz external_llvm-ad7c0f5649d9cee42bd54e02b817316dddb8db80.tar.bz2 | |
I was confused about this, it turns out that MorphNodeTo
*does* delete ex-operands that become dead.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97559 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index f708ff2..7e1ce42 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -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 |