From 7ff30bb1a5b04e52a0b2a3a2cb961eb34a7dde56 Mon Sep 17 00:00:00 2001
From: Bruno Cardoso Lopes <bruno.cardoso@gmail.com>
Date: Tue, 31 Aug 2010 21:38:49 +0000
Subject: [PATCH] Use MOVHLPS node instead of matching using movhlps and
 movhlps_undef pattern fragments

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112644 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index d413e6c34a3..1b18eb60d13 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -2585,6 +2585,7 @@ static bool isTargetShuffle(unsigned Opcode) {
   case X86ISD::SHUFPD:
   case X86ISD::SHUFPS:
   case X86ISD::MOVLHPS:
+  case X86ISD::MOVHLPS:
   case X86ISD::MOVSS:
   case X86ISD::MOVSD:
   case X86ISD::PUNPCKLDQ:
@@ -2624,6 +2625,7 @@ static SDValue getTargetShuffleNode(unsigned Opc, DebugLoc dl, EVT VT,
   default: llvm_unreachable("Unknown x86 shuffle node");
   case X86ISD::MOVLHPS:
   case X86ISD::MOVLHPD:
+  case X86ISD::MOVHLPS:
   case X86ISD::MOVSS:
   case X86ISD::MOVSD:
   case X86ISD::PUNPCKLDQ:
@@ -5021,6 +5023,22 @@ SDValue getMOVLowToHigh(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG,
   return getTargetShuffleNode(X86ISD::MOVLHPS, dl, VT, V1, V2, DAG);
 }
 
+static
+SDValue getMOVHighToLow(SDValue &Op, DebugLoc &dl, SelectionDAG &DAG) {
+  SDValue V1 = Op.getOperand(0);
+  SDValue V2 = Op.getOperand(1);
+  EVT VT = Op.getValueType();
+
+  assert((VT == MVT::v4i32 || VT == MVT::v4f32) &&
+         "unsupported shuffle type");
+
+  if (V2.getOpcode() == ISD::UNDEF)
+    V2 = V1;
+
+  // v4i32 or v4f32
+  return getTargetShuffleNode(X86ISD::MOVHLPS, dl, VT, V1, V2, DAG);
+}
+
 SDValue
 X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
@@ -5131,6 +5149,9 @@ X86TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op, SelectionDAG &DAG) const {
     if (X86::isMOVLHPSMask(SVOp) && !X86::isUNPCKLMask(SVOp))
       return getMOVLowToHigh(Op, dl, DAG, HasSSE2);
 
+    if (X86::isMOVHLPSMask(SVOp))
+      return getMOVHighToLow(Op, dl, DAG);
+
     if (X86::isMOVSHDUPMask(SVOp) ||
         X86::isMOVSLDUPMask(SVOp) ||
         X86::isMOVHLPSMask(SVOp) ||