/* { dg-do run } */
/* { dg-options "-O2 -floop-interchange -fdump-tree-linterchange-details" } */
/* { dg-require-effective-target size20plus } */
/* { dg-skip-if "too big data segment" { visium-*-* } } */

#define M 256
int a[M][M], b[M][M], c[M], d[M];
void __attribute__((noinline))
simple_reduc_1 (int n)
{
  for (int j = 0; j < n; j++)
    {
      int sum = c[j];
      for (int i = 0; i < n; i++)
	sum = sum + a[i][j]*b[i][j];

      c[j] = sum;
    }
}