commit 5023ef281c719914681e4f2b12d4d120923d8127
author Bruno Cardoso Lopes <bruno.cardoso@gmail.com> Tue Aug 31 22:22:11 2010 +0000
committer Bruno Cardoso Lopes <bruno.cardoso@gmail.com> Tue Aug 31 22:22:11 2010 +0000
tree 03132c434020c390241b67911c5d1aa17d1ceb50
parent 2d811d38d43479995d5b4c97b7a777b0f8984325

Use x86 specific MOVSHDUP node and add more patterns to match it

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112657 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/X86/X86ISelLowering.cpp

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 1b18eb6..d9207d9 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2586,6 +2586,7 @@
   case X86ISD::SHUFPS:
   case X86ISD::MOVLHPS:
   case X86ISD::MOVHLPS:
+  case X86ISD::MOVSHDUP:
   case X86ISD::MOVSS:
   case X86ISD::MOVSD:
   case X86ISD::PUNPCKLDQ:
@@ -2595,6 +2596,17 @@
 }
 
 static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
+                                               SDValue V1, SelectionDAG &DAG) {
+  switch(Opc) {
+  default: llvm_unreachable("Unknown x86 shuffle node");
+  case X86ISD::MOVSHDUP:
+    return DAG.getNode(Opc, dl, VT, V1);
+  }
+
+  return SDValue();
+}
+
+static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
                           SDValue V1, unsigned TargetMask, SelectionDAG &DAG) {
   switch(Opc) {
   default: llvm_unreachable("Unknown x86 shuffle node");
@@ -5053,6 +5065,7 @@
   bool V1IsSplat = false;
   bool V2IsSplat = false;
   bool HasSSE2 = Subtarget->hasSSE2() || Subtarget->hasAVX();
+  bool HasSSE3 = Subtarget->hasSSE3() || Subtarget->hasAVX();
   MachineFunction &MF = DAG.getMachineFunction();
   bool OptForSize = MF.getFunction()->hasFnAttr(Attribute::OptimizeForSize);
 
@@ -5152,8 +5165,10 @@
     if (X86::isMOVHLPSMask(SVOp))
       return getMOVHighToLow(Op, dl, DAG);
 
-    if (X86::isMOVSHDUPMask(SVOp) ||
-        X86::isMOVSLDUPMask(SVOp) ||
+    if (X86::isMOVSHDUPMask(SVOp) && HasSSE3 && V2IsUndef && NumElems == 4)
+      return getTargetShuffleNode(X86ISD::MOVSHDUP, dl, VT, V1, DAG);
+
+    if (X86::isMOVSLDUPMask(SVOp) ||
         X86::isMOVHLPSMask(SVOp) ||
         X86::isMOVLPMask(SVOp))
       return Op;