From 75ea413a1b4209ee74525af1cb9c71b5fa7c3465 Mon Sep 17 00:00:00 2001
From: Filipe Cabecinhas <me@filcab.net>
Date: Mon, 5 May 2014 19:40:36 +0000
Subject: [PATCH] Revert "Optimize shufflevector that copies an i64/f64 and
 zeros the rest."

This reverts commit 207992. I misread the phab number on the LGTM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207993 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/X86/X86ISelLowering.cpp | 33 +++++++++++-------------------
 test/CodeGen/X86/avx-shuffle.ll    |  8 --------
 test/CodeGen/X86/sse2.ll           |  8 --------
 3 files changed, 12 insertions(+), 37 deletions(-)

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 63c7ab8fef6..0ed30f5a6f0 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -7468,8 +7468,9 @@ static SDValue LowerVectorIntExtend(SDValue Op, const X86Subtarget *Subtarget,
                      DAG.getNode(X86ISD::VZEXT, DL, NVT, V1));
 }
 
-static SDValue NormalizeVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
-                                      SelectionDAG &DAG) {
+static SDValue
+NormalizeVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
+                       SelectionDAG &DAG) {
   ShuffleVectorSDNode *SVOp = cast<ShuffleVectorSDNode>(Op);
   MVT VT = Op.getSimpleValueType();
   SDLoc dl(Op);
@@ -7494,43 +7495,33 @@ static SDValue NormalizeVectorShuffle(SDValue Op, const X86Subtarget *Subtarget,
 
   // If the shuffle can be profitably rewritten as a narrower shuffle, then
   // do it!
-  if (VT == MVT::v8i16 || VT == MVT::v16i8 || VT == MVT::v16i16 ||
-      VT == MVT::v32i8) {
+  if (VT == MVT::v8i16  || VT == MVT::v16i8 ||
+      VT == MVT::v16i16 || VT == MVT::v32i8) {
     SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG);
     if (NewOp.getNode())
       return DAG.getNode(ISD::BITCAST, dl, VT, NewOp);
-  } else if ((VT == MVT::v4i32 || (VT == MVT::v4f32 && Subtarget->hasSSE2()))) {
+  } else if ((VT == MVT::v4i32 ||
+             (VT == MVT::v4f32 && Subtarget->hasSSE2()))) {
     // FIXME: Figure out a cleaner way to do this.
+    // Try to make use of movq to zero out the top part.
     if (ISD::isBuildVectorAllZeros(V2.getNode())) {
       SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG);
       if (NewOp.getNode()) {
         MVT NewVT = NewOp.getSimpleValueType();
         if (isCommutedMOVLMask(cast<ShuffleVectorSDNode>(NewOp)->getMask(),
                                NewVT, true, false))
-          return getVZextMovL(VT, NewVT, NewOp.getOperand(0), DAG, Subtarget,
-                              dl);
+          return getVZextMovL(VT, NewVT, NewOp.getOperand(0),
+                              DAG, Subtarget, dl);
       }
     } else if (ISD::isBuildVectorAllZeros(V1.getNode())) {
       SDValue NewOp = RewriteAsNarrowerShuffle(SVOp, DAG);
       if (NewOp.getNode()) {
         MVT NewVT = NewOp.getSimpleValueType();
         if (isMOVLMask(cast<ShuffleVectorSDNode>(NewOp)->getMask(), NewVT))
-          return getVZextMovL(VT, NewVT, NewOp.getOperand(1), DAG, Subtarget,
-                              dl);
+          return getVZextMovL(VT, NewVT, NewOp.getOperand(1),
+                              DAG, Subtarget, dl);
       }
     }
-  } else if ((VT == MVT::v2i64 || VT == MVT::v2f64) && Subtarget->hasSSE2()) {
-    // Emit movq and vmovq to copy an i64 or f64 to a vector and zero the
-    // other bits.
-    if (ISD::isBuildVectorAllZeros(V2.getNode())) {
-      MVT NewVT = SVOp->getSimpleValueType(0);
-      if (isCommutedMOVLMask(SVOp->getMask(), NewVT, true, false))
-        return getVZextMovL(VT, NewVT, SVOp->getOperand(0), DAG, Subtarget, dl);
-    } else if (ISD::isBuildVectorAllZeros(V1.getNode())) {
-      MVT NewVT = SVOp->getSimpleValueType(0);
-      if (isMOVLMask(SVOp->getMask(), NewVT))
-        return getVZextMovL(VT, NewVT, SVOp->getOperand(1), DAG, Subtarget, dl);
-    }
   }
   return SDValue();
 }
diff --git a/test/CodeGen/X86/avx-shuffle.ll b/test/CodeGen/X86/avx-shuffle.ll
index e472042b2ce..02aa617c56c 100644
--- a/test/CodeGen/X86/avx-shuffle.ll
+++ b/test/CodeGen/X86/avx-shuffle.ll
@@ -306,11 +306,3 @@ define void @test20() {
   store <3 x double> %a1, <3 x double>* undef, align 1
   ret void
 }
-
-define <2 x i64> @test_insert_64_zext(<2 x i64> %i) {
-; CHECK-LABEL: test_insert_64_zext
-; CHECK-NOT: xor
-; CHECK: vmovq
-  %1 = shufflevector <2 x i64> %i, <2 x i64> <i64 0, i64 undef>, <2 x i32> <i32 0, i32 2>
-  ret <2 x i64> %1
-}
diff --git a/test/CodeGen/X86/sse2.ll b/test/CodeGen/X86/sse2.ll
index 0a17eaca411..628dba0b101 100644
--- a/test/CodeGen/X86/sse2.ll
+++ b/test/CodeGen/X86/sse2.ll
@@ -221,11 +221,3 @@ entry:
  %double2float.i = fptrunc <4 x double> %0 to <4 x float>
  ret <4 x float> %double2float.i
 }
-
-define <2 x i64> @test_insert_64_zext(<2 x i64> %i) {
-; CHECK-LABEL: test_insert_64_zext
-; CHECK-NOT: xor
-; CHECK: movq
-  %1 = shufflevector <2 x i64> %i, <2 x i64> <i64 0, i64 undef>, <2 x i32> <i32 0, i32 2>
-  ret <2 x i64> %1
-}