Revert r166971. It causes buildbot failure. To be investigated.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166979 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 9 insertions, 13 deletions

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 4b6ab74582..29ba59c7a7 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -6438,17 +6438,17 @@ LowerVECTOR_SHUFFLE_128v4(ShuffleVectorSDNode *SVOp, SelectionDAG &DAG) {
 }
 
 static bool MayFoldVectorLoad(SDValue V) {
-  while (V.hasOneUse() && V.getOpcode() == ISD::BITCAST)
+  if (V.hasOneUse() && V.getOpcode() == ISD::BITCAST)
     V = V.getOperand(0);
-
   if (V.hasOneUse() && V.getOpcode() == ISD::SCALAR_TO_VECTOR)
     V = V.getOperand(0);
   if (V.hasOneUse() && V.getOpcode() == ISD::BUILD_VECTOR &&
       V.getNumOperands() == 2 && V.getOperand(1).getOpcode() == ISD::UNDEF)
     // BUILD_VECTOR (load), undef
     V = V.getOperand(0);
-
-  return MayFoldLoad(V);
+  if (MayFoldLoad(V))
+    return true;
+  return false;
 }
 
 // FIXME: the version above should always be used. Since there's
diff --git a/test/CodeGen/X86/vec_shuffle-30.ll b/test/CodeGen/X86/vec_shuffle-30.ll
index f5f8842605..1651c4cdac 100644
--- a/test/CodeGen/X86/vec_shuffle-30.ll
+++ b/test/CodeGen/X86/vec_shuffle-30.ll
@@ -1,25 +1,21 @@
-; RUN: llc < %s -march=x86 -mattr=+avx | FileCheck %s
+; RUN: llc < %s -march=x86 -mattr=sse41 -o %t
+; RUN: grep pshufhw %t | grep -- -95 | count 1
+; RUN: grep shufps %t | count 1
+; RUN: not grep pslldq %t
 
-; CHECK: test
 ; Test case when creating pshufhw, we incorrectly set the higher order bit
 ; for an undef,
 define void @test(<8 x i16>* %dest, <8 x i16> %in) nounwind {
 entry:
-; CHECK-NOT: vmovaps
-; CHECK: vmovlpd
-; CHECK: vpshufhw        $-95
   %0 = load <8 x i16>* %dest
   %1 = shufflevector <8 x i16> %0, <8 x i16> %in, <8 x i32> < i32 0, i32 1, i32 2, i32 3, i32 13, i32 undef, i32 14, i32 14>
   store <8 x i16> %1, <8 x i16>* %dest
   ret void
-}
+}                              
 
-; CHECK: test2
 ; A test case where we shouldn't generate a punpckldq but a pshufd and a pslldq
 define void @test2(<4 x i32>* %dest, <4 x i32> %in) nounwind {
 entry:
-; CHECK-NOT: pslldq
-; CHECK: shufps
   %0 = shufflevector <4 x i32> %in, <4 x i32> <i32 0, i32 0, i32 0, i32 0>, <4 x i32> < i32 undef, i32 5, i32 undef, i32 2>
   store <4 x i32> %0, <4 x i32>* %dest
   ret void