Index: llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
+++ llvm/trunk/lib/Target/X86/X86ISelLowering.cpp
@@ -5601,6 +5601,24 @@
     }
   }
 
+  auto CreateLoad = [&DAG, &DL](EVT VT, LoadSDNode *LDBase) {
+    SDValue NewLd = DAG.getLoad(VT, DL, LDBase->getChain(),
+                                LDBase->getBasePtr(), LDBase->getPointerInfo(),
+                                LDBase->isVolatile(), LDBase->isNonTemporal(),
+                                LDBase->isInvariant(), LDBase->getAlignment());
+
+    if (LDBase->hasAnyUseOfValue(1)) {
+      SDValue NewChain =
+          DAG.getNode(ISD::TokenFactor, DL, MVT::Other, SDValue(LDBase, 1),
+                      SDValue(NewLd.getNode(), 1));
+      DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
+      DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
+                             SDValue(NewLd.getNode(), 1));
+    }
+
+    return NewLd;
+  };
+
   // LOAD - all consecutive load/undefs (must start/end with a load).
   // If we have found an entire vector of loads and undefs, then return a large
   // load of the entire vector width starting at the base pointer.
@@ -5616,23 +5634,7 @@
     if (isAfterLegalize && !TLI.isOperationLegal(ISD::LOAD, VT))
       return SDValue();
 
-    SDValue NewLd = SDValue();
-
-    NewLd = DAG.getLoad(VT, DL, LDBase->getChain(), LDBase->getBasePtr(),
-                        LDBase->getPointerInfo(), LDBase->isVolatile(),
-                        LDBase->isNonTemporal(), LDBase->isInvariant(),
-                        LDBase->getAlignment());
-
-    if (LDBase->hasAnyUseOfValue(1)) {
-      SDValue NewChain =
-          DAG.getNode(ISD::TokenFactor, DL, MVT::Other, SDValue(LDBase, 1),
-                      SDValue(NewLd.getNode(), 1));
-      DAG.ReplaceAllUsesOfValueWith(SDValue(LDBase, 1), NewChain);
-      DAG.UpdateNodeOperands(NewChain.getNode(), SDValue(LDBase, 1),
-                             SDValue(NewLd.getNode(), 1));
-    }
-
-    return NewLd;
+    return CreateLoad(VT, LDBase);
   }
 
   int LoadSize =
@@ -5667,6 +5669,19 @@
 
     return DAG.getBitcast(VT, ResNode);
   }
+
+  // VZEXT_MOVL - consecutive 32-bit load/undefs followed by zeros/undefs.
+  if (IsConsecutiveLoad && FirstLoadedElt == 0 && LoadSize == 32 &&
+      ((VT.is128BitVector() && TLI.isTypeLegal(MVT::v4i32)) ||
+       (VT.is256BitVector() && TLI.isTypeLegal(MVT::v8i32)) ||
+       (VT.is512BitVector() && TLI.isTypeLegal(MVT::v16i32)))) {
+    MVT VecVT = MVT::getVectorVT(MVT::i32, VT.getSizeInBits() / 32);
+    SDValue V = CreateLoad(MVT::i32, LDBase);
+    V = DAG.getNode(ISD::SCALAR_TO_VECTOR, DL, VecVT, V);
+    V = DAG.getNode(X86ISD::VZEXT_MOVL, DL, VecVT, V);
+    return DAG.getBitcast(VT, V);
+  }
+
   return SDValue();
 }
 
Index: llvm/trunk/lib/Target/X86/X86InstrAVX512.td
===================================================================
--- llvm/trunk/lib/Target/X86/X86InstrAVX512.td
+++ llvm/trunk/lib/Target/X86/X86InstrAVX512.td
@@ -3046,6 +3046,18 @@
   def : Pat<(v4f64 (X86vzmovl (insert_subvector undef,
                    (v2f64 (scalar_to_vector (loadf64 addr:$src))), (iPTR 0)))),
             (SUBREG_TO_REG (i32 0), (VMOVSDZrm addr:$src), sub_xmm)>;
+
+  // Represent the same patterns above but in the form they appear for
+  // 512-bit types
+  def : Pat<(v16i32 (X86vzmovl (insert_subvector undef,
+                   (v4i32 (scalar_to_vector (loadi32 addr:$src))), (iPTR 0)))),
+            (SUBREG_TO_REG (i32 0), (VMOVDI2PDIZrm addr:$src), sub_xmm)>;
+  def : Pat<(v16f32 (X86vzmovl (insert_subvector undef,
+                   (v4f32 (scalar_to_vector (loadf32 addr:$src))), (iPTR 0)))),
+            (SUBREG_TO_REG (i32 0), (VMOVSSZrm addr:$src), sub_xmm)>;
+  def : Pat<(v8f64 (X86vzmovl (insert_subvector undef,
+                   (v2f64 (scalar_to_vector (loadf64 addr:$src))), (iPTR 0)))),
+            (SUBREG_TO_REG (i32 0), (VMOVSDZrm addr:$src), sub_xmm)>;
   }
   def : Pat<(v8f32 (X86vzmovl (insert_subvector undef,
                    (v4f32 (scalar_to_vector FR32X:$src)), (iPTR 0)))),
Index: llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-128.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-128.ll
+++ llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-128.ll
@@ -418,21 +418,18 @@
 define <8 x i16> @merge_8i16_i16_34uuuuuu(i16* %ptr) nounwind uwtable noinline ssp {
 ; SSE-LABEL: merge_8i16_i16_34uuuuuu:
 ; SSE:       # BB#0:
-; SSE-NEXT:    pinsrw $0, 6(%rdi), %xmm0
-; SSE-NEXT:    pinsrw $1, 8(%rdi), %xmm0
+; SSE-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: merge_8i16_i16_34uuuuuu:
 ; AVX:       # BB#0:
-; AVX-NEXT:    vpinsrw $0, 6(%rdi), %xmm0, %xmm0
-; AVX-NEXT:    vpinsrw $1, 8(%rdi), %xmm0, %xmm0
+; AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; AVX-NEXT:    retq
 ;
 ; X32-SSE-LABEL: merge_8i16_i16_34uuuuuu:
 ; X32-SSE:       # BB#0:
 ; X32-SSE-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-SSE-NEXT:    pinsrw $0, 6(%eax), %xmm0
-; X32-SSE-NEXT:    pinsrw $1, 8(%eax), %xmm0
+; X32-SSE-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; X32-SSE-NEXT:    retl
   %ptr0 = getelementptr inbounds i16, i16* %ptr, i64 3
   %ptr1 = getelementptr inbounds i16, i16* %ptr, i64 4
@@ -537,42 +534,20 @@
 }
 
 define <16 x i8> @merge_16i8_i8_01u3uuzzuuuuuzzz(i8* %ptr) nounwind uwtable noinline ssp {
-; SSE2-LABEL: merge_16i8_i8_01u3uuzzuuuuuzzz:
-; SSE2:       # BB#0:
-; SSE2-NEXT:    movzbl (%rdi), %eax
-; SSE2-NEXT:    movzbl 1(%rdi), %ecx
-; SSE2-NEXT:    shll $8, %ecx
-; SSE2-NEXT:    orl %eax, %ecx
-; SSE2-NEXT:    pxor %xmm0, %xmm0
-; SSE2-NEXT:    pinsrw $0, %ecx, %xmm0
-; SSE2-NEXT:    movzbl 3(%rdi), %eax
-; SSE2-NEXT:    shll $8, %eax
-; SSE2-NEXT:    pinsrw $1, %eax, %xmm0
-; SSE2-NEXT:    retq
-;
-; SSE41-LABEL: merge_16i8_i8_01u3uuzzuuuuuzzz:
-; SSE41:       # BB#0:
-; SSE41-NEXT:    pxor %xmm0, %xmm0
-; SSE41-NEXT:    pinsrb $0, (%rdi), %xmm0
-; SSE41-NEXT:    pinsrb $1, 1(%rdi), %xmm0
-; SSE41-NEXT:    pinsrb $3, 3(%rdi), %xmm0
-; SSE41-NEXT:    retq
+; SSE-LABEL: merge_16i8_i8_01u3uuzzuuuuuzzz:
+; SSE:       # BB#0:
+; SSE-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; SSE-NEXT:    retq
 ;
 ; AVX-LABEL: merge_16i8_i8_01u3uuzzuuuuuzzz:
 ; AVX:       # BB#0:
-; AVX-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX-NEXT:    vpinsrb $0, (%rdi), %xmm0, %xmm0
-; AVX-NEXT:    vpinsrb $1, 1(%rdi), %xmm0, %xmm0
-; AVX-NEXT:    vpinsrb $3, 3(%rdi), %xmm0, %xmm0
+; AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; AVX-NEXT:    retq
 ;
 ; X32-SSE-LABEL: merge_16i8_i8_01u3uuzzuuuuuzzz:
 ; X32-SSE:       # BB#0:
 ; X32-SSE-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-SSE-NEXT:    pxor %xmm0, %xmm0
-; X32-SSE-NEXT:    pinsrb $0, (%eax), %xmm0
-; X32-SSE-NEXT:    pinsrb $1, 1(%eax), %xmm0
-; X32-SSE-NEXT:    pinsrb $3, 3(%eax), %xmm0
+; X32-SSE-NEXT:    movd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; X32-SSE-NEXT:    retl
   %ptr0 = getelementptr inbounds i8, i8* %ptr, i64 0
   %ptr1 = getelementptr inbounds i8, i8* %ptr, i64 1
Index: llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-256.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-256.ll
+++ llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-256.ll
@@ -542,37 +542,15 @@
 }
 
 define <16 x i16> @merge_16i16_i16_89zzzuuuuuuuuuuuz(i16* %ptr) nounwind uwtable noinline ssp {
-; AVX1-LABEL: merge_16i16_i16_89zzzuuuuuuuuuuuz:
-; AVX1:       # BB#0:
-; AVX1-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX1-NEXT:    vpinsrw $0, 16(%rdi), %xmm0, %xmm1
-; AVX1-NEXT:    vpinsrw $1, 18(%rdi), %xmm1, %xmm1
-; AVX1-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
-; AVX1-NEXT:    retq
-;
-; AVX2-LABEL: merge_16i16_i16_89zzzuuuuuuuuuuuz:
-; AVX2:       # BB#0:
-; AVX2-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX2-NEXT:    vpinsrw $0, 16(%rdi), %xmm0, %xmm1
-; AVX2-NEXT:    vpinsrw $1, 18(%rdi), %xmm1, %xmm1
-; AVX2-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX2-NEXT:    retq
-;
-; AVX512F-LABEL: merge_16i16_i16_89zzzuuuuuuuuuuuz:
-; AVX512F:       # BB#0:
-; AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512F-NEXT:    vpinsrw $0, 16(%rdi), %xmm0, %xmm1
-; AVX512F-NEXT:    vpinsrw $1, 18(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512F-NEXT:    retq
+; AVX-LABEL: merge_16i16_i16_89zzzuuuuuuuuuuuz:
+; AVX:       # BB#0:
+; AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; AVX-NEXT:    retq
 ;
 ; X32-AVX-LABEL: merge_16i16_i16_89zzzuuuuuuuuuuuz:
 ; X32-AVX:       # BB#0:
 ; X32-AVX-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-AVX-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; X32-AVX-NEXT:    vpinsrw $0, 16(%eax), %xmm0, %xmm1
-; X32-AVX-NEXT:    vpinsrw $1, 18(%eax), %xmm1, %xmm1
-; X32-AVX-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
+; X32-AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; X32-AVX-NEXT:    retl
   %ptr0 = getelementptr inbounds i16, i16* %ptr, i64 8
   %ptr1 = getelementptr inbounds i16, i16* %ptr, i64 9
@@ -704,17 +682,13 @@
 define <32 x i8> @merge_32i8_i8_45u7uuuuuuuuuuuuuuuuuuuuuuuuuuuu(i8* %ptr) nounwind uwtable noinline ssp {
 ; AVX-LABEL: merge_32i8_i8_45u7uuuuuuuuuuuuuuuuuuuuuuuuuuuu:
 ; AVX:       # BB#0:
-; AVX-NEXT:    vpinsrb $0, 4(%rdi), %xmm0, %xmm0
-; AVX-NEXT:    vpinsrb $1, 5(%rdi), %xmm0, %xmm0
-; AVX-NEXT:    vpinsrb $3, 7(%rdi), %xmm0, %xmm0
+; AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; AVX-NEXT:    retq
 ;
 ; X32-AVX-LABEL: merge_32i8_i8_45u7uuuuuuuuuuuuuuuuuuuuuuuuuuuu:
 ; X32-AVX:       # BB#0:
 ; X32-AVX-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-AVX-NEXT:    vpinsrb $0, 4(%eax), %xmm0, %xmm0
-; X32-AVX-NEXT:    vpinsrb $1, 5(%eax), %xmm0, %xmm0
-; X32-AVX-NEXT:    vpinsrb $3, 7(%eax), %xmm0, %xmm0
+; X32-AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; X32-AVX-NEXT:    retl
   %ptr0 = getelementptr inbounds i8, i8* %ptr, i64 4
   %ptr1 = getelementptr inbounds i8, i8* %ptr, i64 5
@@ -729,41 +703,15 @@
 }
 
 define <32 x i8> @merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu(i8* %ptr) nounwind uwtable noinline ssp {
-; AVX1-LABEL: merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu:
-; AVX1:       # BB#0:
-; AVX1-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX1-NEXT:    vpinsrb $0, 2(%rdi), %xmm0, %xmm1
-; AVX1-NEXT:    vpinsrb $1, 3(%rdi), %xmm1, %xmm1
-; AVX1-NEXT:    vpinsrb $3, 5(%rdi), %xmm1, %xmm1
-; AVX1-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
-; AVX1-NEXT:    retq
-;
-; AVX2-LABEL: merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu:
-; AVX2:       # BB#0:
-; AVX2-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX2-NEXT:    vpinsrb $0, 2(%rdi), %xmm0, %xmm1
-; AVX2-NEXT:    vpinsrb $1, 3(%rdi), %xmm1, %xmm1
-; AVX2-NEXT:    vpinsrb $3, 5(%rdi), %xmm1, %xmm1
-; AVX2-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX2-NEXT:    retq
-;
-; AVX512F-LABEL: merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu:
-; AVX512F:       # BB#0:
-; AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512F-NEXT:    vpinsrb $0, 2(%rdi), %xmm0, %xmm1
-; AVX512F-NEXT:    vpinsrb $1, 3(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vpinsrb $3, 5(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512F-NEXT:    retq
+; AVX-LABEL: merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu:
+; AVX:       # BB#0:
+; AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; AVX-NEXT:    retq
 ;
 ; X32-AVX-LABEL: merge_32i8_i8_23u5uuuuuuuuuuzzzzuuuuuuuuuuuuuu:
 ; X32-AVX:       # BB#0:
 ; X32-AVX-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-AVX-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; X32-AVX-NEXT:    vpinsrb $0, 2(%eax), %xmm0, %xmm1
-; X32-AVX-NEXT:    vpinsrb $1, 3(%eax), %xmm1, %xmm1
-; X32-AVX-NEXT:    vpinsrb $3, 5(%eax), %xmm1, %xmm1
-; X32-AVX-NEXT:    vinsertf128 $1, %xmm0, %ymm1, %ymm0
+; X32-AVX-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; X32-AVX-NEXT:    retl
   %ptr0 = getelementptr inbounds i8, i8* %ptr, i64 2
   %ptr1 = getelementptr inbounds i8, i8* %ptr, i64 3
Index: llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-512.ll
===================================================================
--- llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-512.ll
+++ llvm/trunk/test/CodeGen/X86/merge-consecutive-loads-512.ll
@@ -570,31 +570,20 @@
 define <32 x i16> @merge_32i16_i16_23uzuuuuuuuuuuzzzzuuuuuuuuuuuuuu(i16* %ptr) nounwind uwtable noinline ssp {
 ; AVX512F-LABEL: merge_32i16_i16_23uzuuuuuuuuuuzzzzuuuuuuuuuuuuuu:
 ; AVX512F:       # BB#0:
-; AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512F-NEXT:    vpinsrw $0, 4(%rdi), %xmm0, %xmm1
-; AVX512F-NEXT:    vpinsrw $1, 6(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512F-NEXT:    vpxor %ymm1, %ymm1, %ymm1
+; AVX512F-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; AVX512F-NEXT:    vxorps %ymm1, %ymm1, %ymm1
 ; AVX512F-NEXT:    retq
 ;
 ; AVX512BW-LABEL: merge_32i16_i16_23uzuuuuuuuuuuzzzzuuuuuuuuuuuuuu:
 ; AVX512BW:       # BB#0:
-; AVX512BW-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512BW-NEXT:    vpinsrw $0, 4(%rdi), %xmm0, %xmm1
-; AVX512BW-NEXT:    vpinsrw $1, 6(%rdi), %xmm1, %xmm1
-; AVX512BW-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512BW-NEXT:    vpxor %ymm1, %ymm1, %ymm1
-; AVX512BW-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
+; AVX512BW-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; AVX512BW-NEXT:    retq
 ;
 ; X32-AVX512F-LABEL: merge_32i16_i16_23uzuuuuuuuuuuzzzzuuuuuuuuuuuuuu:
 ; X32-AVX512F:       # BB#0:
 ; X32-AVX512F-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; X32-AVX512F-NEXT:    vpinsrw $0, 4(%eax), %xmm0, %xmm1
-; X32-AVX512F-NEXT:    vpinsrw $1, 6(%eax), %xmm1, %xmm1
-; X32-AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; X32-AVX512F-NEXT:    vpxor %ymm1, %ymm1, %ymm1
+; X32-AVX512F-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; X32-AVX512F-NEXT:    vxorps %ymm1, %ymm1, %ymm1
 ; X32-AVX512F-NEXT:    retl
   %ptr0 = getelementptr inbounds i16, i16* %ptr, i64 2
   %ptr1 = getelementptr inbounds i16, i16* %ptr, i64 3
@@ -651,34 +640,20 @@
 define <64 x i8> @merge_64i8_i8_12u4uuuuuuuuuuzzzzuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuz(i8* %ptr) nounwind uwtable noinline ssp {
 ; AVX512F-LABEL: merge_64i8_i8_12u4uuuuuuuuuuzzzzuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuz:
 ; AVX512F:       # BB#0:
-; AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512F-NEXT:    vpinsrb $0, 1(%rdi), %xmm0, %xmm1
-; AVX512F-NEXT:    vpinsrb $1, 2(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vpinsrb $3, 4(%rdi), %xmm1, %xmm1
-; AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512F-NEXT:    vpxor %ymm1, %ymm1, %ymm1
+; AVX512F-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; AVX512F-NEXT:    vxorps %ymm1, %ymm1, %ymm1
 ; AVX512F-NEXT:    retq
 ;
 ; AVX512BW-LABEL: merge_64i8_i8_12u4uuuuuuuuuuzzzzuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuz:
 ; AVX512BW:       # BB#0:
-; AVX512BW-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; AVX512BW-NEXT:    vpinsrb $0, 1(%rdi), %xmm0, %xmm1
-; AVX512BW-NEXT:    vpinsrb $1, 2(%rdi), %xmm1, %xmm1
-; AVX512BW-NEXT:    vpinsrb $3, 4(%rdi), %xmm1, %xmm1
-; AVX512BW-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; AVX512BW-NEXT:    vpxor %ymm1, %ymm1, %ymm1
-; AVX512BW-NEXT:    vinserti64x4 $1, %ymm1, %zmm0, %zmm0
+; AVX512BW-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
 ; AVX512BW-NEXT:    retq
 ;
 ; X32-AVX512F-LABEL: merge_64i8_i8_12u4uuuuuuuuuuzzzzuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuz:
 ; X32-AVX512F:       # BB#0:
 ; X32-AVX512F-NEXT:    movl {{[0-9]+}}(%esp), %eax
-; X32-AVX512F-NEXT:    vpxor %xmm0, %xmm0, %xmm0
-; X32-AVX512F-NEXT:    vpinsrb $0, 1(%eax), %xmm0, %xmm1
-; X32-AVX512F-NEXT:    vpinsrb $1, 2(%eax), %xmm1, %xmm1
-; X32-AVX512F-NEXT:    vpinsrb $3, 4(%eax), %xmm1, %xmm1
-; X32-AVX512F-NEXT:    vinserti128 $1, %xmm0, %ymm1, %ymm0
-; X32-AVX512F-NEXT:    vpxor %ymm1, %ymm1, %ymm1
+; X32-AVX512F-NEXT:    vmovd {{.*#+}} xmm0 = mem[0],zero,zero,zero
+; X32-AVX512F-NEXT:    vxorps %ymm1, %ymm1, %ymm1
 ; X32-AVX512F-NEXT:    retl
   %ptr0 = getelementptr inbounds i8, i8* %ptr, i64 1
   %ptr1 = getelementptr inbounds i8, i8* %ptr, i64 2