gcc/testsuite/gcc.dg/vect/pr83965.c

/* { dg-do compile } */
/* { dg-additional-options "-ftrapv" } */

int
mac (const short *a, const short *b, int sqr, int *sum)
{
  int i;
  int dotp = *sum;

  for (i = 0; i < 150; i++)
    {
      dotp += b[i] * a[i];
      sqr += b[i] * b[i];
    }

  *sum = dotp;
  return sqr;
}