[Bug rtl-optimization/55273] [4.8 Regression] ICE in iv_number_of_iterations, at loop-iv.c:2819

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55273

--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> 2012-12-07 10:06:56 UTC ---
Reduced testcase:

extern int debug_threads;
extern void sigsuspend (void);
void my_waitpid (int flags, int wnohang)
{
  while (1)
    {
      if (flags & 0x80000000)
        {
          if (wnohang)
            break;
          if (debug_threads)
            __builtin_puts ("blocking\n");
          sigsuspend ();
        }
      flags ^= 0x80000000;
    }
}