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/* { dg-do compile { target { { i?86-*-* x86_64-*-* } && ia32 } } } */

/* { dg-options "-O2 --param min-insn-to-prefetch-ratio=5 -fprefetch-loop-arrays -march=athlon -fdump-tree-aprefetch-details" } */

/* These are common idioms for writing variable-length arrays at the end

   of structures.  We should not deduce anything about the number of iterations

   of the loops from them.  */

struct tail0

{

  int xxx;

  int yyy[0];

};

int loop0 (int n, struct tail0 *x)

{

  int i, s = 0;

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

    s += x->yyy[i];

  return s;

}

struct tail1

{

  int xxx;

  int yyy[1];

};

int loop1 (int n, struct tail1 *x)

{

  int i, s = 0;

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

    s += x->yyy[i];

  return s;

}

/* It is unlikely that this should be a tail array.  We may deduce that most

   likely, the loop iterates about 5 times, and the array is not worth prefetching.  */

struct tail5

{

  int xxx;

  int yyy[5];

};

int loop5 (int n, struct tail5 *x)

{

  int i, s = 0;

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

    s += x->yyy[i];

  return s;

}

/* { dg-final { scan-tree-dump-times "Issued prefetch" 2 "aprefetch" } } */

/* { dg-final { scan-tree-dump-times "Not prefetching" 1 "aprefetch" } } */

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