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Fold trivial two-operand tokenfactors where the operands are equal
immediately. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56921 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -2320,6 +2320,7 @@ SDValue SelectionDAG::getNode(unsigned Opcode, MVT VT,
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// Fold trivial token factors.
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if (N1.getOpcode() == ISD::EntryToken) return N2;
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if (N2.getOpcode() == ISD::EntryToken) return N1;
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if (N1 == N2) return N1;
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break;
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case ISD::CONCAT_VECTORS:
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// A CONCAT_VECTOR with all operands BUILD_VECTOR can be simplified to
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