From: Bruno Cardoso Lopes <bruno.cardoso@gmail.com>
Date: Sat, 4 Sep 2010 02:58:56 +0000 (+0000)
Subject: Remove the last bit of isShuffleMaskLegal checks and improve the comment regarding... 
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2eb63dfa0a618fe58b9335ceb4e2b67ab5c9f679;p=oota-llvm.git

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 147f201ac67..974d9eb6ea3 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -5472,14 +5472,12 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
                                 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)