[Bug middle-end/33670] [4.3 Regression] cc1 segfault with -O2 -fsched-stalled-insns=0 for twolf

[jakub at gcc dot gnu dot org]

------- Comment #3 from jakub at gcc dot gnu dot org  2007-11-02 23:17 -------
Fixed for ppc64.

I haven't added the requested stop at the start of bb, Maxim, if you want to
do that, please go ahead.
Also, I have just found that this testcase fails on ia64 native for a different
reason (wonder why I haven't reproduced that with cross ia64 before).
On ia64 the problem is that the backend sets DO_SPECULATION in flags
in ia64_set_sched_flags - mflag_sched_ar_data_spec is 1 by default and
when user asks for -fsched-stalled-insns=5 (or =0), then
/* Perform a few consistency checks of flags in different data structures.  */
static void
check_sched_flags (void)
{
  unsigned int f = current_sched_info->flags;

  if (flag_sched_stalled_insns)
    gcc_assert (!(f & DO_SPECULATION));
  if (f & DO_SPECULATION)
    gcc_assert (!flag_sched_stalled_insns
                && spec_info
                && spec_info->mask);
}
fails.  It compiles with -O2 -fno-sched-stalled-insns or -O2
-fsched-stalled-insns=0 -mno-sched-ar-data-spec
I see no code that would try to do anything to satisfy this assert, should
ia64 disallow -fsched-stalled-insns by setting flag_sched_stalled_insns = 0?
Or if it is non-zero don't set DO_SPECULATION?  Something else?


-- 

jakub at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mkuvyrkov at gcc dot gnu dot
                   |                            |org
         AssignedTo|jakub at gcc dot gnu dot org|unassigned at gcc dot gnu
                   |                            |dot org
             Status|ASSIGNED                    |NEW


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33670