Remove the last bit of isShuffleMaskLegal checks and improve the comment regarding mmx shuffles
llvm-svn: 113059
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@ -5472,14 +5472,12 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
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X86::getShufflePALIGNRImmediate(SVOp),
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DAG);
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// MMX shuffles not already handled must be expanded.
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// Only a few shuffle masks are handled for 64-bit vectors (MMX), and
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// 64-bit vectors which made to this point can't be handled, they are
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// expanded.
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if (VT.getSizeInBits() == 64)
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return SDValue();
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// FIXME: pshufb, blends, shifts.
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if (VT.getVectorNumElements() == 2)
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return Op;
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if (ShuffleVectorSDNode::isSplatMask(&M[0], VT) &&
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SVOp->getSplatIndex() == 0 && V2IsUndef) {
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if (VT == MVT::v2f64)
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