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/* { dg-do compile } */

/* { dg-options "-O2 -Wunsafe-loop-optimizations" } */

extern void g(void);

void

f (unsigned n)

{

  unsigned k;

  for(k = 0;k <= n;k++) /* { dg-warning "cannot optimize.*infinite loops" } */

    g();

  for(k = 0;k <= n;k += 4) /* { dg-warning "cannot optimize.*overflow" } */

    g();

  /* We used to get warning for this loop.  However, since then # of iterations

     analysis improved, and we can now prove that this loop does not verflow.

     This is because the only case when it would overflow is if n = ~0 (since

     ~0 is divisible by 5), and this cannot be the case, since when we got

     here, the previous loop exited, thus there exists k > n.  */

  for(k = 5;k <= n;k += 5)

    g();

  /* So we need the following loop, instead.  */

  for(k = 4;k <= n;k += 5) /* { dg-warning "cannot optimize.*overflow" } */

    g();

  for(k = 15;k >= n;k--) /* { dg-warning "cannot optimize.*infinite" } */

    g();

}