--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.target/i386/avx512f-pr94300.c	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,21 @@
+/* PR tree-optimization/94300 */
+/* { dg-do run { target { avx512f } } } */
+/* { dg-options "-O1 -mavx512f -mprefer-vector-width=512 -mtune=skylake-avx512" } */
+
+#include "avx512f-check.h"
+
+typedef double V __attribute__((vector_size (64)));
+
+static void
+avx512f_test (void)
+{
+  double mem[16];
+  const V a = { 0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0 };
+  const V b = { 8.0, 9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0 };
+  V c;
+  __builtin_memcpy (mem, &a, 64);
+  __builtin_memcpy (mem + 8, &b, 64);
+  __builtin_memcpy (&c, mem + 4, 64);
+  if (c[5] != 9.0)
+    __builtin_abort ();
+}