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/* { dg-do compile } */

/* { dg-options "-O3 -fdump-tree-local-pure-const1 -fdump-tree-optimized" } */

static __attribute__ ((noinline, noclone))

int i_am_pure(char *c, int n)

{

  char *d=__builtin_alloca (n);

  int i;

  int sum;

  for (i=0;i<n;i++)

    d[i] = c[i];

  for (i=0;i<n;i++)

    d[i] *= c[n-i];

  for (i=0;i<n;i++)

    sum+=d[i];

  if (sum)

    __builtin_unreachable ();

  return sum;

}

char array[11];

int

main(void)

{

  i_am_pure (array,5);

  i_am_pure (array,11);

  return 0;

}

/* { dg-final { scan-tree-dump "found to be pure: i_am_pure" "local-pure-const1"} } */

/* { dg-final { scan-tree-dump-not "i_am_pure" "optimized"} } */

/* { dg-final { cleanup-tree-dump "local-pure-const1" } } */

/* { dg-final { cleanup-tree-dump "optimized" } } */