gcc/testsuite/gcc.dg/pr87320.c

   1 /* PR tree-optimization/87320 */
   2 /* { dg-do run } */
   3 /* { dg-require-effective-target alloca } */
   4 /* { dg-options "-O3" } */
   5 /* { dg-additional-options "-mavx" { target avx_runtime } } */
   6
   7 static void __attribute__ ((noinline))
   8 transpose_vector (unsigned long n)
   9 {
  10   unsigned long data[2 * n];
  11   for (unsigned long i = 0; i < 2 * n; i++)
  12     data[i] = 4 * i + 2;
  13
  14   unsigned long transposed[n];
  15   for (unsigned long i = 0; i < n; i++)
  16     transposed[i] = data[2 * i];
  17
  18   for (unsigned long i = 0; i < n; i++)
  19     if (transposed[i] != 8 * i + 2)
  20       __builtin_abort ();
  21 }
  22
  23 int
  24 main ()
  25 {
  26   transpose_vector (4);
  27   transpose_vector (120);
  28   return 0;
  29 }