re PR tree-optimization/87320 (Last iteration of vectorized loop not executed…

re PR tree-optimization/87320 (Last iteration of vectorized loop not executed when peeling for gaps)

	PR tree-optimization/87320
	* gcc.dg/pr87320.c: New test.

From-SVN: r266805

gcc/testsuite/ChangeLog

+2018-12-04  Jakub Jelinek  <jakub@redhat.com>
+
+	PR tree-optimization/87320
+	* gcc.dg/pr87320.c: New test.
+
 2018-12-04  Jeff Law  <law@redhat.com>
 
 	* gcc.dg/strlenopt-58.c: Handle targets with 2 byte wchar_t.

gcc/testsuite/gcc.dg/pr87320.c

+/* PR tree-optimization/87320 */
+/* { dg-do run } */
+/* { 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;
+}