Index: cfe/trunk/lib/Headers/emmintrin.h
===================================================================
--- cfe/trunk/lib/Headers/emmintrin.h
+++ cfe/trunk/lib/Headers/emmintrin.h
@@ -505,6 +505,16 @@
   return ((struct __loadu_pd*)__dp)->__v;
 }
 
+static __inline__ __m128i __DEFAULT_FN_ATTRS
+_mm_loadu_si64(void const *__a)
+{
+  struct __loadu_si64 {
+    long long __v;
+  } __attribute__((__packed__, __may_alias__));
+  long long __u = ((struct __loadu_si64*)__a)->__v;
+  return (__m128i){__u, 0L};
+}
+
 static __inline__ __m128d __DEFAULT_FN_ATTRS
 _mm_load_sd(double const *__dp)
 {
Index: cfe/trunk/test/CodeGen/sse2-builtins.c
===================================================================
--- cfe/trunk/test/CodeGen/sse2-builtins.c
+++ cfe/trunk/test/CodeGen/sse2-builtins.c
@@ -1532,3 +1532,12 @@
   // CHECK: xor <2 x i64> %{{.*}}, %{{.*}}
   return _mm_xor_si128(A, B);
 }
+
+__m128i test_mm_loadu_si64(void const* A) {
+  // CHECK-LABEL: test_mm_loadu_si64
+  // CHECK: load i64, i64* %{{.*}}, align 1{{$}}
+  // CHECK: insertelement <2 x i64> undef, i64 %{{.*}}, i32 0
+  // CHECK: insertelement <2 x i64> %{{.*}}, i64 0, i32 1
+  return _mm_loadu_si64(A);
+}
+