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[DAGCombine] narrowInsertExtractVectorBinOp - early out for illegal op. NFCI.

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If the subvector binop is illegal then early-out and avoid the subvector searches.

llvm-svn: 367181
This commit is contained in:
Simon Pilgrim 2019-07-27 19:42:58 +00:00
parent cd5d699ac4
commit f05799cd65
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/SelectionDAG/DAGCombiner.cpp
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@ -18023,13 +18023,16 @@ static SDValue narrowInsertExtractVectorBinOp(SDNode *Extract,
SDValue Bop0 = BinOp.getOperand(0), Bop1 = BinOp.getOperand(1);
SDValue Index = Extract->getOperand(1);
EVT SubVT = Extract->getValueType(0);
if (!TLI.isOperationLegalOrCustom(BinOpcode, SubVT))
return SDValue();
SDValue Sub0 = getSubVectorSrc(Bop0, Index, SubVT);
SDValue Sub1 = getSubVectorSrc(Bop1, Index, SubVT);
// TODO: We could handle the case where only 1 operand is being inserted by
// creating an extract of the other operand, but that requires checking
// number of uses and/or costs.
if (!Sub0 || !Sub1 || !TLI.isOperationLegalOrCustom(BinOpcode, SubVT))
if (!Sub0 || !Sub1)
return SDValue();
// We are inserting both operands of the wide binop only to extract back