Index: lib/Headers/avx512bwintrin.h
===================================================================
--- lib/Headers/avx512bwintrin.h
+++ lib/Headers/avx512bwintrin.h
@@ -1751,7 +1751,7 @@
 _mm512_loadu_epi16 (void const *__P)
 {
   struct __loadu_epi16 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi16*)__P)->__v;
 }
@@ -1777,7 +1777,7 @@
 _mm512_loadu_epi8 (void const *__P)
 {
   struct __loadu_epi8 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi8*)__P)->__v;
 }
@@ -1803,7 +1803,7 @@
 _mm512_storeu_epi16 (void *__P, __m512i __A)
 {
   struct __storeu_epi16 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi16*)__P)->__v = __A;
 }
@@ -1820,7 +1820,7 @@
 _mm512_storeu_epi8 (void *__P, __m512i __A)
 {
   struct __storeu_epi8 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi8*)__P)->__v = __A;
 }
Index: lib/Headers/avx512fintrin.h
===================================================================
--- lib/Headers/avx512fintrin.h
+++ lib/Headers/avx512fintrin.h
@@ -40,9 +40,13 @@
 typedef unsigned long long __v8du __attribute__((__vector_size__(64)));
 typedef unsigned int __v16su __attribute__((__vector_size__(64)));
 
-typedef float __m512 __attribute__((__vector_size__(64)));
-typedef double __m512d __attribute__((__vector_size__(64)));
-typedef long long __m512i __attribute__((__vector_size__(64)));
+typedef float __m512 __attribute__((__vector_size__(64), __aligned__(64)));
+typedef double __m512d __attribute__((__vector_size__(64), __aligned__(64)));
+typedef long long __m512i __attribute__((__vector_size__(64), __aligned__(64)));
+
+typedef float __m512_u __attribute__((__vector_size__(64), __aligned__(1)));
+typedef double __m512d_u __attribute__((__vector_size__(64), __aligned__(1)));
+typedef long long __m512i_u __attribute__((__vector_size__(64), __aligned__(1)));
 
 typedef unsigned char __mmask8;
 typedef unsigned short __mmask16;
@@ -4324,7 +4328,7 @@
 _mm512_loadu_si512 (void const *__P)
 {
   struct __loadu_si512 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_si512*)__P)->__v;
 }
@@ -4333,7 +4337,7 @@
 _mm512_loadu_epi32 (void const *__P)
 {
   struct __loadu_epi32 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi32*)__P)->__v;
 }
@@ -4360,7 +4364,7 @@
 _mm512_loadu_epi64 (void const *__P)
 {
   struct __loadu_epi64 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi64*)__P)->__v;
 }
@@ -4420,7 +4424,7 @@
 _mm512_loadu_pd(void const *__p)
 {
   struct __loadu_pd {
-    __m512d __v;
+    __m512d_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_pd*)__p)->__v;
 }
@@ -4429,7 +4433,7 @@
 _mm512_loadu_ps(void const *__p)
 {
   struct __loadu_ps {
-    __m512 __v;
+    __m512_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_ps*)__p)->__v;
 }
@@ -4504,7 +4508,7 @@
 _mm512_storeu_epi64 (void *__P, __m512i __A)
 {
   struct __storeu_epi64 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi64*)__P)->__v = __A;
 }
@@ -4520,7 +4524,7 @@
 _mm512_storeu_si512 (void *__P, __m512i __A)
 {
   struct __storeu_si512 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_si512*)__P)->__v = __A;
 }
@@ -4529,7 +4533,7 @@
 _mm512_storeu_epi32 (void *__P, __m512i __A)
 {
   struct __storeu_epi32 {
-    __m512i __v;
+    __m512i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi32*)__P)->__v = __A;
 }
@@ -4551,7 +4555,7 @@
 _mm512_storeu_pd(void *__P, __m512d __A)
 {
   struct __storeu_pd {
-    __m512d __v;
+    __m512d_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_pd*)__P)->__v = __A;
 }
@@ -4567,7 +4571,7 @@
 _mm512_storeu_ps(void *__P, __m512 __A)
 {
   struct __storeu_ps {
-    __m512 __v;
+    __m512_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_ps*)__P)->__v = __A;
 }
Index: lib/Headers/avx512vlbwintrin.h
===================================================================
--- lib/Headers/avx512vlbwintrin.h
+++ lib/Headers/avx512vlbwintrin.h
@@ -2301,7 +2301,7 @@
 _mm_loadu_epi16 (void const *__P)
 {
   struct __loadu_epi16 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi16*)__P)->__v;
 }
@@ -2327,7 +2327,7 @@
 _mm256_loadu_epi16 (void const *__P)
 {
   struct __loadu_epi16 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi16*)__P)->__v;
 }
@@ -2353,7 +2353,7 @@
 _mm_loadu_epi8 (void const *__P)
 {
   struct __loadu_epi8 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi8*)__P)->__v;
 }
@@ -2379,7 +2379,7 @@
 _mm256_loadu_epi8 (void const *__P)
 {
   struct __loadu_epi8 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi8*)__P)->__v;
 }
@@ -2405,7 +2405,7 @@
 _mm_storeu_epi16 (void *__P, __m128i __A)
 {
   struct __storeu_epi16 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi16*)__P)->__v = __A;
 }
@@ -2422,7 +2422,7 @@
 _mm256_storeu_epi16 (void *__P, __m256i __A)
 {
   struct __storeu_epi16 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi16*)__P)->__v = __A;
 }
@@ -2439,7 +2439,7 @@
 _mm_storeu_epi8 (void *__P, __m128i __A)
 {
   struct __storeu_epi8 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi8*)__P)->__v = __A;
 }
@@ -2456,7 +2456,7 @@
 _mm256_storeu_epi8 (void *__P, __m256i __A)
 {
   struct __storeu_epi8 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi8*)__P)->__v = __A;
 }
Index: lib/Headers/avx512vlintrin.h
===================================================================
--- lib/Headers/avx512vlintrin.h
+++ lib/Headers/avx512vlintrin.h
@@ -5513,7 +5513,7 @@
 _mm_loadu_epi64 (void const *__P)
 {
   struct __loadu_epi64 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi64*)__P)->__v;
 }
@@ -5539,7 +5539,7 @@
 _mm256_loadu_epi64 (void const *__P)
 {
   struct __loadu_epi64 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi64*)__P)->__v;
 }
@@ -5565,7 +5565,7 @@
 _mm_loadu_epi32 (void const *__P)
 {
   struct __loadu_epi32 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi32*)__P)->__v;
 }
@@ -5591,7 +5591,7 @@
 _mm256_loadu_epi32 (void const *__P)
 {
   struct __loadu_epi32 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_epi32*)__P)->__v;
 }
@@ -5717,7 +5717,7 @@
 _mm_storeu_epi64 (void *__P, __m128i __A)
 {
   struct __storeu_epi64 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi64*)__P)->__v = __A;
 }
@@ -5734,7 +5734,7 @@
 _mm256_storeu_epi64 (void *__P, __m256i __A)
 {
   struct __storeu_epi64 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi64*)__P)->__v = __A;
 }
@@ -5751,7 +5751,7 @@
 _mm_storeu_epi32 (void *__P, __m128i __A)
 {
   struct __storeu_epi32 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi32*)__P)->__v = __A;
 }
@@ -5768,7 +5768,7 @@
 _mm256_storeu_epi32 (void *__P, __m256i __A)
 {
   struct __storeu_epi32 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_epi32*)__P)->__v = __A;
 }
Index: lib/Headers/avxintrin.h
===================================================================
--- lib/Headers/avxintrin.h
+++ lib/Headers/avxintrin.h
@@ -45,9 +45,13 @@
  * appear in the interface though. */
 typedef signed char __v32qs __attribute__((__vector_size__(32)));
 
-typedef float __m256 __attribute__ ((__vector_size__ (32)));
-typedef double __m256d __attribute__((__vector_size__(32)));
-typedef long long __m256i __attribute__((__vector_size__(32)));
+typedef float __m256 __attribute__ ((__vector_size__ (32), __aligned__(32)));
+typedef double __m256d __attribute__((__vector_size__(32), __aligned__(32)));
+typedef long long __m256i __attribute__((__vector_size__(32), __aligned__(32)));
+
+typedef float __m256_u __attribute__ ((__vector_size__ (32), __aligned__(1)));
+typedef double __m256d_u __attribute__((__vector_size__(32), __aligned__(1)));
+typedef long long __m256i_u __attribute__((__vector_size__(32), __aligned__(1)));
 
 /* Define the default attributes for the functions in this file. */
 #define __DEFAULT_FN_ATTRS __attribute__((__always_inline__, __nodebug__, __target__("avx"), __min_vector_width__(256)))
@@ -3113,7 +3117,7 @@
 _mm256_loadu_pd(double const *__p)
 {
   struct __loadu_pd {
-    __m256d __v;
+    __m256d_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_pd*)__p)->__v;
 }
@@ -3133,7 +3137,7 @@
 _mm256_loadu_ps(float const *__p)
 {
   struct __loadu_ps {
-    __m256 __v;
+    __m256_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_ps*)__p)->__v;
 }
@@ -3169,7 +3173,7 @@
 _mm256_loadu_si256(__m256i const *__p)
 {
   struct __loadu_si256 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_si256*)__p)->__v;
 }
@@ -3246,7 +3250,7 @@
 _mm256_storeu_pd(double *__p, __m256d __a)
 {
   struct __storeu_pd {
-    __m256d __v;
+    __m256d_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_pd*)__p)->__v = __a;
 }
@@ -3266,7 +3270,7 @@
 _mm256_storeu_ps(float *__p, __m256 __a)
 {
   struct __storeu_ps {
-    __m256 __v;
+    __m256_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_ps*)__p)->__v = __a;
 }
@@ -3304,7 +3308,7 @@
 _mm256_storeu_si256(__m256i *__p, __m256i __a)
 {
   struct __storeu_si256 {
-    __m256i __v;
+    __m256i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_si256*)__p)->__v = __a;
 }
Index: lib/Headers/emmintrin.h
===================================================================
--- lib/Headers/emmintrin.h
+++ lib/Headers/emmintrin.h
@@ -26,8 +26,11 @@
 
 #include <xmmintrin.h>
 
-typedef double __m128d __attribute__((__vector_size__(16)));
-typedef long long __m128i __attribute__((__vector_size__(16)));
+typedef double __m128d __attribute__((__vector_size__(16), __aligned__(16)));
+typedef long long __m128i __attribute__((__vector_size__(16), __aligned__(16)));
+
+typedef double __m128d_u __attribute__((__vector_size__(16), __aligned__(1)));
+typedef long long __m128i_u __attribute__((__vector_size__(16), __aligned__(1)));
 
 /* Type defines.  */
 typedef double __v2df __attribute__ ((__vector_size__ (16)));
@@ -1652,7 +1655,7 @@
 _mm_loadu_pd(double const *__dp)
 {
   struct __loadu_pd {
-    __m128d __v;
+    __m128d_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_pd*)__dp)->__v;
 }
@@ -2042,7 +2045,7 @@
 _mm_storeu_pd(double *__dp, __m128d __a)
 {
   struct __storeu_pd {
-    __m128d __v;
+    __m128d_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_pd*)__dp)->__v = __a;
 }
@@ -3567,7 +3570,7 @@
 _mm_loadu_si128(__m128i const *__p)
 {
   struct __loadu_si128 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   return ((struct __loadu_si128*)__p)->__v;
 }
@@ -4030,7 +4033,7 @@
 _mm_storeu_si128(__m128i *__p, __m128i __b)
 {
   struct __storeu_si128 {
-    __m128i __v;
+    __m128i_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_si128*)__p)->__v = __b;
 }
Index: lib/Headers/mmintrin.h
===================================================================
--- lib/Headers/mmintrin.h
+++ lib/Headers/mmintrin.h
@@ -24,7 +24,7 @@
 #ifndef __MMINTRIN_H
 #define __MMINTRIN_H
 
-typedef long long __m64 __attribute__((__vector_size__(8)));
+typedef long long __m64 __attribute__((__vector_size__(8), __aligned__(8)));
 
 typedef long long __v1di __attribute__((__vector_size__(8)));
 typedef int __v2si __attribute__((__vector_size__(8)));
Index: lib/Headers/xmmintrin.h
===================================================================
--- lib/Headers/xmmintrin.h
+++ lib/Headers/xmmintrin.h
@@ -28,7 +28,9 @@
 
 typedef int __v4si __attribute__((__vector_size__(16)));
 typedef float __v4sf __attribute__((__vector_size__(16)));
-typedef float __m128 __attribute__((__vector_size__(16)));
+typedef float __m128 __attribute__((__vector_size__(16), __aligned__(16)));
+
+typedef float __m128_u __attribute__((__vector_size__(16), __aligned__(1)));
 
 /* Unsigned types */
 typedef unsigned int __v4su __attribute__((__vector_size__(16)));
@@ -1987,7 +1989,7 @@
 _mm_storeu_ps(float *__p, __m128 __a)
 {
   struct __storeu_ps {
-    __m128 __v;
+    __m128_u __v;
   } __attribute__((__packed__, __may_alias__));
   ((struct __storeu_ps*)__p)->__v = __a;
 }
Index: test/CodeGen/x86-vec-struct-packing.c
===================================================================
--- test/CodeGen/x86-vec-struct-packing.c
+++ test/CodeGen/x86-vec-struct-packing.c
@@ -0,0 +1,227 @@
+// RUN: %clang_cc1 -ffreestanding -emit-llvm-only  -triple x86_64-windows-coff -fdump-record-layouts %s | FileCheck %s --check-prefix=CHECK-MS
+// RUN: %clang_cc1 -ffreestanding -emit-llvm-only  -triple x86_64-apple-darwin -fdump-record-layouts %s | FileCheck %s --check-prefix=CHECK-NOTMS
+#include <x86intrin.h>
+
+#pragma pack(1)
+
+struct s_m64 {
+  int a;
+  __m64 b;
+};
+typedef struct s_m64 m64;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m64) == 16) - 1];
+#else
+static int a1[(sizeof(m64) == 12) - 1];
+#endif
+
+struct s_m128 {
+  int a;
+  __m128 b;
+};
+typedef struct s_m128 m128;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m128) == 32) - 1];
+#else
+static int a1[(sizeof(m128) == 20) - 1];
+#endif
+
+struct s_m128i {
+  int a;
+  __m128i b;
+};
+typedef struct s_m128i m128i;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m128i) == 32) - 1];
+#else
+static int a1[(sizeof(m128i) == 20) - 1];
+#endif
+
+struct s_m128d {
+  int a;
+  __m128d b;
+};
+typedef struct s_m128d m128d;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m128d) == 32) - 1];
+#else
+static int a1[(sizeof(m128d) == 20) - 1];
+#endif
+
+struct s_m256 {
+  int a;
+  __m256 b;
+};
+typedef struct s_m256 m256;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m256) == 64) - 1];
+#else
+static int a1[(sizeof(m256) == 36) - 1];
+#endif
+
+struct s_m256i {
+  int a;
+  __m256i b;
+};
+typedef struct s_m256i m256i;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m256i) == 64) - 1];
+#else
+static int a1[(sizeof(m256i) == 36) - 1];
+#endif
+
+struct s_m256d {
+  int a;
+  __m256d b;
+};
+typedef struct s_m256d m256d;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m256d) == 64) - 1];
+#else
+static int a1[(sizeof(m256d) == 36) - 1];
+#endif
+
+struct s_m512 {
+  int a;
+  __m512 b;
+};
+typedef struct s_m512 m512;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m512) == 128) - 1];
+#else
+static int a1[(sizeof(m512) == 68) - 1];
+#endif
+
+struct s_m512i {
+  int a;
+  __m512i b;
+};
+typedef struct s_m512i m512i;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m512i) == 128) - 1];
+#else
+static int a1[(sizeof(m512i) == 68) - 1];
+#endif
+
+struct s_m512d {
+  int a;
+  __m512d b;
+};
+typedef struct s_m512d m512d;
+
+#if defined(_WIN32)
+static int a1[(sizeof(m512d) == 128) - 1];
+#else
+static int a1[(sizeof(m512d) == 68) - 1];
+#endif
+
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m64
+// CHECK-MS:          0 |   int a
+// CHECK-MS:          8 |   __m64 b
+// CHECK-MS:            | [sizeof=16, align=8]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m128
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         16 |   __m128 b
+// CHECK-MS:            | [sizeof=32, align=16]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m128i
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         16 |   __m128i b
+// CHECK-MS:            | [sizeof=32, align=16]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m128d
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         16 |   __m128d b
+// CHECK-MS:            | [sizeof=32, align=16]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m256
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         32 |   __m256 b
+// CHECK-MS:            | [sizeof=64, align=32]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m256i
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         32 |   __m256i b
+// CHECK-MS:            | [sizeof=64, align=32]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m256d
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         32 |   __m256d b
+// CHECK-MS:            | [sizeof=64, align=32]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m512
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         64 |   __m512 b
+// CHECK-MS:            | [sizeof=128, align=64]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m512i
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         64 |   __m512i b
+// CHECK-MS:            | [sizeof=128, align=64]
+// CHECK-MS: *** Dumping AST Record Layout
+// CHECK-MS:          0 | struct s_m512d
+// CHECK-MS:          0 |   int a
+// CHECK-MS:         64 |   __m512d b
+// CHECK-MS:            | [sizeof=128, align=64]
+
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m64
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m64 b
+// CHECK-NOTMS:            | [sizeof=12, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m128
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m128 b
+// CHECK-NOTMS:            | [sizeof=20, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m128i
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m128i b
+// CHECK-NOTMS:            | [sizeof=20, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m128d
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m128d b
+// CHECK-NOTMS:            | [sizeof=20, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m256
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m256 b
+// CHECK-NOTMS:            | [sizeof=36, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m256i
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m256i b
+// CHECK-NOTMS:            | [sizeof=36, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m256d
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m256d b
+// CHECK-NOTMS:            | [sizeof=36, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m512
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m512 b
+// CHECK-NOTMS:            | [sizeof=68, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m512i
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m512i b
+// CHECK-NOTMS:            | [sizeof=68, align=1]
+// CHECK-NOTMS: *** Dumping AST Record Layout
+// CHECK-NOTMS:          0 | struct s_m512d
+// CHECK-NOTMS:          0 |   int a
+// CHECK-NOTMS:          4 |   __m512d b
+// CHECK-NOTMS:            | [sizeof=68, align=1]