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/* { dg-do compile } */

/* { dg-do run } */

/* { dg-options "-O2 -fpredictive-commoning -fdump-tree-pcom-details" } */

void abort (void);

unsigned fib[1000];

__attribute__ ((noinline))

void count_fib(void)

{

  int i;

  fib[0] = 0;

  fib[1] = 1;

  for (i = 2; i < 1000; i++)

    fib[i] = (fib[i-1] + fib[i - 2]) & 0xffff;

}

unsigned avg[1000];

__attribute__ ((noinline))

void count_averages(int n)

{

  int i;

  for (i = 1; i < n; i++)

    avg[i] = (((unsigned long) fib[i - 1] + fib[i] + fib[i + 1]) / 3) & 0xffff;

}

int main(void)

{

  count_fib ();

  count_averages (999);

  if (fib[19] != 4181 || avg[19] != 4510)

    abort ();

  if (fib[999] != 162 || avg[998] != 21953)

    abort ();

  return 0;

}

/* Verify that both loops were transformed and unrolled.  */

/* { dg-final { scan-tree-dump-times "Unrolling 2 times." 2 "pcom"} } */

/* Also check that we undid the transformation previously made by PRE.  */

/* { dg-final { scan-tree-dump-times "looparound ref" 1 "pcom"} } */

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