Index: lib/Target/X86/InstPrinter/X86InstComments.cpp
===================================================================
--- lib/Target/X86/InstPrinter/X86InstComments.cpp
+++ lib/Target/X86/InstPrinter/X86InstComments.cpp
@@ -199,6 +199,44 @@
     DecodeMOVSHDUPMask(MVT::v4f32, ShuffleMask);
     break;
 
+  case X86::PSLLDQri:
+  case X86::VPSLLDQri:
+    Src1Name = getRegName(MI->getOperand(1).getReg());
+    DestName = getRegName(MI->getOperand(0).getReg());
+    if(MI->getOperand(MI->getNumOperands()-1).isImm())
+      DecodePSLLDQMask(MVT(MVT::v16i8).getSizeInBits(),
+                       MI->getOperand(MI->getNumOperands()-1).getImm(),
+                       ShuffleMask);
+    break;
+
+  case X86::VPSLLDQYri:
+    Src1Name = getRegName(MI->getOperand(1).getReg());
+    DestName = getRegName(MI->getOperand(0).getReg());
+    if(MI->getOperand(MI->getNumOperands()-1).isImm())
+      DecodePSLLDQMask(MVT(MVT::v32i8).getSizeInBits(),
+                       MI->getOperand(MI->getNumOperands()-1).getImm(),
+                       ShuffleMask);
+    break;
+
+  case X86::PSRLDQri:
+  case X86::VPSRLDQri:
+    Src1Name = getRegName(MI->getOperand(1).getReg());
+    DestName = getRegName(MI->getOperand(0).getReg());
+    if(MI->getOperand(MI->getNumOperands()-1).isImm())
+      DecodePSRLDQMask(MVT(MVT::v16i8).getSizeInBits(),
+                       MI->getOperand(MI->getNumOperands()-1).getImm(),
+                       ShuffleMask);
+    break;
+
+  case X86::VPSRLDQYri:
+    Src1Name = getRegName(MI->getOperand(1).getReg());
+    DestName = getRegName(MI->getOperand(0).getReg());
+    if(MI->getOperand(MI->getNumOperands()-1).isImm())
+      DecodePSRLDQMask(MVT(MVT::v32i8).getSizeInBits(),
+                       MI->getOperand(MI->getNumOperands()-1).getImm(),
+                       ShuffleMask);
+    break;
+
   case X86::PALIGNR128rr:
   case X86::VPALIGNR128rr:
     Src1Name = getRegName(MI->getOperand(2).getReg());
Index: lib/Target/X86/Utils/X86ShuffleDecode.h
===================================================================
--- lib/Target/X86/Utils/X86ShuffleDecode.h
+++ lib/Target/X86/Utils/X86ShuffleDecode.h
@@ -40,6 +40,10 @@
 
 void DecodeMOVSHDUPMask(MVT VT, SmallVectorImpl<int> &ShuffleMask);
 
+void DecodePSLLDQMask(unsigned VectorSizeInBits, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
+
+void DecodePSRLDQMask(unsigned VectorSizeInBits, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
+
 void DecodePALIGNRMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
 
 void DecodePSHUFMask(MVT VT, unsigned Imm, SmallVectorImpl<int> &ShuffleMask);
Index: lib/Target/X86/Utils/X86ShuffleDecode.cpp
===================================================================
--- lib/Target/X86/Utils/X86ShuffleDecode.cpp
+++ lib/Target/X86/Utils/X86ShuffleDecode.cpp
@@ -79,6 +79,35 @@
   }
 }
 
+void DecodePSLLDQMask(unsigned VectorSizeInBits, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+  unsigned NumElts = VectorSizeInBits / 8;
+  unsigned NumLanes = VectorSizeInBits / 128;
+  unsigned NumLaneElts = NumElts / NumLanes;
+
+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+    for (unsigned i = 0; i != NumLaneElts; ++i) {
+      int M = SM_SentinelZero;
+      if (i >= Imm) M = i - Imm + l;
+      ShuffleMask.push_back(M);
+    }
+  }
+}
+
+void DecodePSRLDQMask(unsigned VectorSizeInBits, unsigned Imm, SmallVectorImpl<int> &ShuffleMask) {
+  unsigned NumElts = VectorSizeInBits / 8;
+  unsigned NumLanes = VectorSizeInBits / 128;
+  unsigned NumLaneElts = NumElts / NumLanes;
+
+  for (unsigned l = 0; l != NumElts; l += NumLaneElts) {
+    for (unsigned i = 0; i != NumLaneElts; ++i) {
+      unsigned Base = i + Imm;
+      int M = Base + l;
+      if (Base >= NumLaneElts) M = SM_SentinelZero;
+      ShuffleMask.push_back(M);
+    }
+  }
+}
+
 void DecodePALIGNRMask(MVT VT, unsigned Imm,
                        SmallVectorImpl<int> &ShuffleMask) {
   unsigned NumElts = VT.getVectorNumElements();
Index: test/CodeGen/X86/vector-shuffle-128-v8.ll
===================================================================
--- test/CodeGen/X86/vector-shuffle-128-v8.ll
+++ test/CodeGen/X86/vector-shuffle-128-v8.ll
@@ -1400,7 +1400,7 @@
 ; SSE:       # BB#0:
 ; SSE-NEXT:    movzwl %di, %eax
 ; SSE-NEXT:    movd %eax, %xmm0
-; SSE-NEXT:    pslldq $2, %xmm0
+; SSE-NEXT:    pslldq $2, %xmm0 {{.*#+}} xmm0 = zero,zero,xmm0[0,1,2,3,4,5,6,7,8,9,10,11,12,13]
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: shuffle_v8i16_z8zzzzzz:
@@ -1407,7 +1407,7 @@
 ; AVX:       # BB#0:
 ; AVX-NEXT:    movzwl %di, %eax
 ; AVX-NEXT:    vmovd %eax, %xmm0
-; AVX-NEXT:    vpslldq $2, %xmm0, %xmm0
+; AVX-NEXT:    vpslldq $2, %xmm0, %xmm0 {{.*#+}} xmm0 = zero,zero,xmm0[0,1,2,3,4,5,6,7,8,9,10,11,12,13]
 ; AVX-NEXT:    retq
   %a = insertelement <8 x i16> undef, i16 %i, i32 0
   %shuffle = shufflevector <8 x i16> zeroinitializer, <8 x i16> %a, <8 x i32> <i32 2, i32 8, i32 3, i32 7, i32 6, i32 5, i32 4, i32 3>
@@ -1419,7 +1419,7 @@
 ; SSE:       # BB#0:
 ; SSE-NEXT:    movzwl %di, %eax
 ; SSE-NEXT:    movd %eax, %xmm0
-; SSE-NEXT:    pslldq $10, %xmm0
+; SSE-NEXT:    pslldq $10, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,xmm0[0,1,2,3,4,5]
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: shuffle_v8i16_zzzzz8zz:
@@ -1426,7 +1426,7 @@
 ; AVX:       # BB#0:
 ; AVX-NEXT:    movzwl %di, %eax
 ; AVX-NEXT:    vmovd %eax, %xmm0
-; AVX-NEXT:    vpslldq $10, %xmm0, %xmm0
+; AVX-NEXT:    vpslldq $10, %xmm0, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,xmm0[0,1,2,3,4,5]
 ; AVX-NEXT:    retq
   %a = insertelement <8 x i16> undef, i16 %i, i32 0
   %shuffle = shufflevector <8 x i16> zeroinitializer, <8 x i16> %a, <8 x i32> <i32 0, i32 0, i32 0, i32 0, i32 0, i32 8, i32 0, i32 0>
@@ -1438,7 +1438,7 @@
 ; SSE:       # BB#0:
 ; SSE-NEXT:    movzwl %di, %eax
 ; SSE-NEXT:    movd %eax, %xmm0
-; SSE-NEXT:    pslldq $14, %xmm0
+; SSE-NEXT:    pslldq $14, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,xmm0[0,1]
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: shuffle_v8i16_zuuzuuz8:
@@ -1445,7 +1445,7 @@
 ; AVX:       # BB#0:
 ; AVX-NEXT:    movzwl %di, %eax
 ; AVX-NEXT:    vmovd %eax, %xmm0
-; AVX-NEXT:    vpslldq $14, %xmm0, %xmm0
+; AVX-NEXT:    vpslldq $14, %xmm0, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,zero,xmm0[0,1]
 ; AVX-NEXT:    retq
   %a = insertelement <8 x i16> undef, i16 %i, i32 0
   %shuffle = shufflevector <8 x i16> zeroinitializer, <8 x i16> %a, <8 x i32> <i32 0, i32 undef, i32 undef, i32 3, i32 undef, i32 undef, i32 6, i32 8>
@@ -1457,7 +1457,7 @@
 ; SSE:       # BB#0:
 ; SSE-NEXT:    movzwl %di, %eax
 ; SSE-NEXT:    movd %eax, %xmm0
-; SSE-NEXT:    pslldq $4, %xmm0
+; SSE-NEXT:    pslldq $4, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,xmm0[0,1,2,3,4,5,6,7,8,9,10,11]
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: shuffle_v8i16_zzBzzzzz:
@@ -1464,7 +1464,7 @@
 ; AVX:       # BB#0:
 ; AVX-NEXT:    movzwl %di, %eax
 ; AVX-NEXT:    vmovd %eax, %xmm0
-; AVX-NEXT:    vpslldq $4, %xmm0, %xmm0
+; AVX-NEXT:    vpslldq $4, %xmm0, %xmm0 {{.*#+}} xmm0 = zero,zero,zero,zero,xmm0[0,1,2,3,4,5,6,7,8,9,10,11]
 ; AVX-NEXT:    retq
   %a = insertelement <8 x i16> undef, i16 %i, i32 3
   %shuffle = shufflevector <8 x i16> zeroinitializer, <8 x i16> %a, <8 x i32> <i32 0, i32 1, i32 11, i32 3, i32 4, i32 5, i32 6, i32 7>