[llvm-commits] [llvm] r113055 - /llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

[Bruno Cardoso Lopes]

Author: bruno
Date: Fri Sep  3 21:02:14 2010
New Revision: 113055

URL: http://llvm.org/viewvc/llvm-project?rev=113055&view=rev
Log:
Emit target specific nodes to handle splats starting at zero indicies

Modified:
    llvm/trunk/lib/Target/X86/X86ISelLowering.cpp

Modified: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/X86/X86ISelLowering.cpp?rev=113055&r1=113054&r2=113055&view=diff
==============================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp (original)
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp Fri Sep  3 21:02:14 2010
@@ -5470,10 +5470,17 @@
 
   // FIXME: pshufb, blends, shifts.
   if (VT.getVectorNumElements() == 2 ||
-      ShuffleVectorSDNode::isSplatMask(&M[0], VT) ||
       isPALIGNRMask(M, VT, Subtarget->hasSSSE3()))
     return Op;
 
+  if (ShuffleVectorSDNode::isSplatMask(&M[0], VT) &&
+      SVOp->getSplatIndex() == 0 && V2IsUndef) {
+    if (VT == MVT::v2f64)
+      return getTargetShuffleNode(X86ISD::UNPCKLPD, dl, VT, V1, V1, DAG);
+    if (VT == MVT::v2i64)
+      return getTargetShuffleNode(X86ISD::PUNPCKLQDQ, dl, VT, V1, V1, DAG);
+  }
+
   if (isPSHUFHWMask(M, VT))
     return getTargetShuffleNode(X86ISD::PSHUFHW, dl, VT, V1,
                                 X86::getShufflePSHUFHWImmediate(SVOp),