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Convert
// 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
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@ -1111,7 +1111,7 @@ SDValue DAGCombiner::visitSUB(SDNode *N) {
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return DAG.getConstant(0, N->getValueType(0));
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// fold (sub c1, c2) -> c1-c2
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if (N0C && N1C)
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return DAG.getNode(ISD::SUB, VT, N0, N1);
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return DAG.getConstant(N0C->getAPIntValue() - N1C->getAPIntValue(), VT);
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// fold (sub x, c) -> (add x, -c)
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if (N1C)
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return DAG.getNode(ISD::ADD, VT, N0,
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