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[X86] Don't check for folding into a store when deciding if we can promote an i16 mul. 

There's no RMW mul operation.

llvm-svn: 328931
This commit is contained in:
Craig Topper 2018-04-01 06:29:32 +00:00
parent db6caabccc
commit 9b8cd5fe55
1 changed files with 4 additions and 2 deletions
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6
llvm/lib/Target/X86/X86ISelLowering.cpp
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@ -38755,10 +38755,12 @@ bool X86TargetLowering::IsDesirableToPromoteOp(SDValue Op, EVT &PVT) const {
SDValue N1 = Op.getOperand(1); SDValue N1 = Op.getOperand(1);
// Avoid disabling potential load folding opportunities. // Avoid disabling potential load folding opportunities.
if (MayFoldLoad(N1) && if (MayFoldLoad(N1) &&
(!Commute || !isa<ConstantSDNode>(N0) || IsFoldableRMW(N1, Op))) (!Commute || !isa<ConstantSDNode>(N0) ||
(Op.getOpcode() != ISD::MUL && IsFoldableRMW(N1, Op))))
return false; return false;
if (MayFoldLoad(N0) && if (MayFoldLoad(N0) &&
((Commute && !isa<ConstantSDNode>(N1)) || IsFoldableRMW(N0, Op))) ((Commute && !isa<ConstantSDNode>(N1)) ||
(Op.getOpcode() != ISD::MUL && IsFoldableRMW(N0, Op))))
return false; return false;
} }
} }