diff --git a/clang/lib/Headers/avx512fp16intrin.h b/clang/lib/Headers/avx512fp16intrin.h
--- a/clang/lib/Headers/avx512fp16intrin.h
+++ b/clang/lib/Headers/avx512fp16intrin.h
@@ -82,11 +82,11 @@
               _Float16 __h21, _Float16 __h22, _Float16 __h23, _Float16 __h24,
               _Float16 __h25, _Float16 __h26, _Float16 __h27, _Float16 __h28,
               _Float16 __h29, _Float16 __h30, _Float16 __h31, _Float16 __h32) {
-  return (__m512h)(__v32hf){__h1,  __h2,  __h3,  __h4,  __h5,  __h6,  __h7,
-                            __h8,  __h9,  __h10, __h11, __h12, __h13, __h14,
-                            __h15, __h16, __h17, __h18, __h19, __h20, __h21,
-                            __h22, __h23, __h24, __h25, __h26, __h27, __h28,
-                            __h29, __h30, __h31, __h32};
+  return (__m512h)(__v32hf){__h32, __h31, __h30, __h29, __h28, __h27, __h26,
+                            __h25, __h24, __h23, __h22, __h21, __h20, __h19,
+                            __h18, __h17, __h16, __h15, __h14, __h13, __h12,
+                            __h11, __h10, __h9,  __h8,  __h7,  __h6,  __h5,
+                            __h4,  __h3,  __h2,  __h1};
 }
 
 #define _mm512_setr_ph(__h1, __h2, __h3, __h4, __h5, __h6, __h7, __h8, __h9,   \
diff --git a/clang/lib/Headers/avx512vlfp16intrin.h b/clang/lib/Headers/avx512vlfp16intrin.h
--- a/clang/lib/Headers/avx512vlfp16intrin.h
+++ b/clang/lib/Headers/avx512vlfp16intrin.h
@@ -48,7 +48,7 @@
 static __inline __m128h __DEFAULT_FN_ATTRS128
 _mm_set_ph(_Float16 __h1, _Float16 __h2, _Float16 __h3, _Float16 __h4,
            _Float16 __h5, _Float16 __h6, _Float16 __h7, _Float16 __h8) {
-  return (__m128h)(__v8hf){__h1, __h2, __h3, __h4, __h5, __h6, __h7, __h8};
+  return (__m128h)(__v8hf){__h8, __h7, __h6, __h5, __h4, __h3, __h2, __h1};
 }
 
 static __inline __m256h __DEFAULT_FN_ATTRS256
@@ -56,9 +56,9 @@
               _Float16 __h5, _Float16 __h6, _Float16 __h7, _Float16 __h8,
               _Float16 __h9, _Float16 __h10, _Float16 __h11, _Float16 __h12,
               _Float16 __h13, _Float16 __h14, _Float16 __h15, _Float16 __h16) {
-  return (__m256h)(__v16hf){__h1,  __h2,  __h3,  __h4,  __h5,  __h6,
-                            __h7,  __h8,  __h9,  __h10, __h11, __h12,
-                            __h13, __h14, __h15, __h16};
+  return (__m256h)(__v16hf){__h16, __h15, __h14, __h13, __h12, __h11,
+                            __h10, __h9,  __h8,  __h7,  __h6,  __h5,
+                            __h4,  __h3,  __h2,  __h1};
 }
 
 #define _mm_setr_ph(__h1, __h2, __h3, __h4, __h5, __h6, __h7, __h8)            \