Hey Evan,
> +++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Fri Dec 7
> 02:07:39 2007
> @@ -2754,10 +2754,33 @@
> }
>
> std::swap(V1, V2);
> - Mask = DAG.getNode(ISD::BUILD_VECTOR, MaskVT, &MaskVec[0],
> MaskVec.size());
> + Mask = DAG.getNode(ISD::BUILD_VECTOR, MaskVT, &MaskVec[0],
> NumElems);
> return DAG.getNode(ISD::VECTOR_SHUFFLE, VT, V1, V2, Mask);
> }
>
> +static
> +SDOperand CommuteVectorShuffleMask(SDOperand Mask, SelectionDAG
> &DAG) {
Please add a comment over this that gives an example of what it
does. I kept misreading the name as "compute..." and couldn't figure
out what it did :)
> +static
> +SDOperand LowerVECTOR_SHUFFLEv8i16(SDOperand V1, SDOperand V2,
> + SDOperand PermMask,
> SelectionDAG &DAG,
> + TargetLowering &TLI) {
Does this cause any pessimizations for v8i16 shuffles that could be
done as v4i32?
-Chris
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