--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/pr87320.c	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,29 @@
+/* PR tree-optimization/87320 */
+/* { dg-do run } */
+/* { dg-require-effective-target alloca } */
+/* { dg-options "-O3" } */
+/* { dg-additional-options "-mavx" { target avx_runtime } } */
+
+static void __attribute__ ((noinline))
+transpose_vector (unsigned long n)
+{
+  unsigned long data[2 * n];
+  for (unsigned long i = 0; i < 2 * n; i++)
+    data[i] = 4 * i + 2;
+
+  unsigned long transposed[n];
+  for (unsigned long i = 0; i < n; i++)
+    transposed[i] = data[2 * i];
+
+  for (unsigned long i = 0; i < n; i++)
+    if (transposed[i] != 8 * i + 2)
+      __builtin_abort ();
+}
+
+int
+main ()
+{
+  transpose_vector (4);
+  transpose_vector (120);
+  return 0;
+}