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Convert

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// fold (sub c1, c2) -> c1-c2

from a no-op into an actual transformation.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2008-09-07 11:34:47 +00:00
parent c7e4c4dd3a
commit ca460d5a39
1 changed files with 1 additions and 1 deletions
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2
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -1111,7 +1111,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
return DAG.getConstant(0, N->getValueType(0));
// fold (sub c1, c2) -> c1-c2
if (N0C && N1C)
return DAG.getNode(ISD::SUB, VT, N0, N1);
return DAG.getConstant(N0C->getAPIntValue() - N1C->getAPIntValue(), VT);
// fold (sub x, c) -> (add x, -c)
if (N1C)
return DAG.getNode(ISD::ADD, VT, N0,