[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;

    }

}