[Bug middle-end/43476] -ffixed-xxx etc processed too early

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43476

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Code has changed slightly but it still seems to apply today:
/* After switches have been processed, which perhaps alter
   `fixed_regs' and `call_used_regs', convert them to HARD_REG_SETs.  */
static void
init_reg_sets_1 (void)
{
  unsigned int i, j;
  unsigned int /* machine_mode */ m;

  restore_register_info ();

#ifdef REG_ALLOC_ORDER
  for (i = 0; i < FIRST_PSEUDO_REGISTER; i++)
    inv_reg_alloc_order[reg_alloc_order[i]] = i;
#endif

  /* Let the target tweak things if necessary.  */

  targetm.conditional_register_usage ();