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Revert the previous check-in. Leave shl x, 1 along for target to deal with.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25121 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1282,9 +1282,6 @@ SDOperand DAGCombiner::visitSHL(SDNode *N) {
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// fold (shl x, 0) -> x
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// fold (shl x, 0) -> x
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if (N1C && N1C->isNullValue())
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if (N1C && N1C->isNullValue())
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return N0;
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return N0;
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// fold (shl x, 1) -> (add x, x)
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if (N1C && N1C->getValue() == 1)
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return DAG.getNode(ISD::ADD, VT, N0, N0);
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// if (shl x, c) is known to be zero, return 0
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// if (shl x, c) is known to be zero, return 0
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if (N1C && MaskedValueIsZero(SDOperand(N, 0), ~0ULL >> (64-OpSizeInBits),TLI))
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if (N1C && MaskedValueIsZero(SDOperand(N, 0), ~0ULL >> (64-OpSizeInBits),TLI))
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return DAG.getConstant(0, VT);
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return DAG.getConstant(0, VT);
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