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Don't leave newly created nodes around if it turns out they are not needed.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45186 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-12-19 01:34:38 +00:00
parent 79200788df
commit 02132d62c1
1 changed files with 4 additions and 2 deletions
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6
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@@ -1446,7 +1446,8 @@ bool DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N,
TLI.isOperationLegal(LoOpt.getOpcode(), LoOpt.getValueType())) { TLI.isOperationLegal(LoOpt.getOpcode(), LoOpt.getValueType())) {
RetVal = true; RetVal = true;
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), LoOpt); DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 0), LoOpt);
} } else
DAG.DeleteNode(Lo.Val);
} }
if (HiExists) { if (HiExists) {
@@ -1457,7 +1458,8 @@ bool DAGCombiner::SimplifyNodeWithTwoResults(SDNode *N,
TLI.isOperationLegal(HiOpt.getOpcode(), HiOpt.getValueType())) { TLI.isOperationLegal(HiOpt.getOpcode(), HiOpt.getValueType())) {
RetVal = true; RetVal = true;
DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), HiOpt); DAG.ReplaceAllUsesOfValueWith(SDOperand(N, 1), HiOpt);
} } else
DAG.DeleteNode(Hi.Val);
} }
return RetVal; return RetVal;