Remove the last bit of isShuffleMaskLegal checks and improve the comment regarding mmx shuffles
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113059 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 147f201..974d9eb 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5472,14 +5472,12 @@
X86::getShufflePALIGNRImmediate(SVOp),
DAG);
- // MMX shuffles not already handled must be expanded.
+ // Only a few shuffle masks are handled for 64-bit vectors (MMX), and
+ // 64-bit vectors which made to this point can't be handled, they are
+ // expanded.
if (VT.getSizeInBits() == 64)
return SDValue();
- // FIXME: pshufb, blends, shifts.
- if (VT.getVectorNumElements() == 2)
- return Op;
-
if (ShuffleVectorSDNode::isSplatMask(&M[0], VT) &&
SVOp->getSplatIndex() == 0 && V2IsUndef) {
if (VT == MVT::v2f64)