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Improve EXTRACT_VECTOR_ELT patch based on comments from Duncan
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95012 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -5411,10 +5411,7 @@ SDValue DAGCombiner::visitEXTRACT_VECTOR_ELT(SDNode *N) {
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EVT NVT = N->getValueType(0);
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if (InOp.getValueType() != NVT) {
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assert(InOp.getValueType().isInteger() && NVT.isInteger());
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if (NVT.getSizeInBits() > InOp.getValueType().getSizeInBits())
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return DAG.getNode(ISD::SIGN_EXTEND, InVec.getDebugLoc(), NVT, InOp);
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else
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return DAG.getNode(ISD::TRUNCATE, InVec.getDebugLoc(), NVT, InOp);
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return DAG.getSExtOrTrunc(InOp, InVec.getDebugLoc(), NVT);
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}
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return InOp;
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}
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@ -2764,13 +2764,16 @@ SDValue SelectionDAG::getNode(unsigned Opcode, DebugLoc DL, EVT VT,
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// EXTRACT_VECTOR_ELT of INSERT_VECTOR_ELT is often formed when vector
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// operations are lowered to scalars.
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if (N1.getOpcode() == ISD::INSERT_VECTOR_ELT) {
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// If the indices are the same, return the inserted element.
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if (N1.getOperand(2) == N2 && VT == N1.getOperand(1).getValueType())
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return N1.getOperand(1);
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// If the indices are known different, extract the element from
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// If the indices are the same, return the inserted element else
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// if the indices are known different, extract the element from
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// the original vector.
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else if (isa<ConstantSDNode>(N1.getOperand(2)) &&
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isa<ConstantSDNode>(N2))
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if (N1.getOperand(2) == N2) {
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if (VT == N1.getOperand(1).getValueType())
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return N1.getOperand(1);
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else
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return getSExtOrTrunc(N1.getOperand(1), DL, VT);
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} else if (isa<ConstantSDNode>(N1.getOperand(2)) &&
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isa<ConstantSDNode>(N2))
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return getNode(ISD::EXTRACT_VECTOR_ELT, DL, VT, N1.getOperand(0), N2);
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}
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break;
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