[Bug preprocessor/99313] ICE while changing global target options via pragma

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99313

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |marxin at gcc dot gnu.org
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2021-03-01

--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
The diff comes from here:

(gdb) p ptr1->x_param_max_completely_peel_times
$3 = 16
(gdb) p ptr2->x_param_max_completely_peel_times
$4 = 64

Which comes from here:

  if (opts->x_s390_tune >= PROCESSOR_2097_Z10)
    {
      SET_OPTION_IF_UNSET (opts, opts_set, param_max_unrolled_insns,
                           100);
      SET_OPTION_IF_UNSET (opts, opts_set, param_max_unroll_times, 32);
      SET_OPTION_IF_UNSET (opts, opts_set, param_max_completely_peeled_insns,
                           2000);
      SET_OPTION_IF_UNSET (opts, opts_set, param_max_completely_peel_times,
                           64);
    }

So this is an obvious situation where a target option modified optimization
options that is global.
I'm going to add exceptions for it.