gcc-x87-mmx-eh.patch

   1 2005-08-19  Uros Bizjak  <uros@kss-loka.si>
   2
   3         * mode-switching.c (create_pre_exit): Skip assignments to
   4         EH_RETURN_STACKADJ_RTX when searching for return_copy insn.
   5         Add comment regarding use insn and simplify check for insns,
   6         generated by builtin_apply_return.
   7
   8 --- gcc/gcc/mode-switching.c    2005-07-05 18:20:07.000000000 +0200
   9 +++ gcc/gcc/mode-switching.c    2005-08-19 10:28:41.000000000 +0200
  10 @@ -250,6 +250,8 @@ create_pre_exit (int n_entities, int *en
  11
  12                 if (INSN_P (return_copy))
  13                   {
  14 +                   /* Skip USE patterns inserted by
  15 +                      builtin_apply_return.  */
  16                     if (GET_CODE (PATTERN (return_copy)) == USE
  17                         && GET_CODE (XEXP (PATTERN (return_copy), 0)) == REG
  18                         && (FUNCTION_VALUE_REGNO_P
  19 @@ -270,6 +272,15 @@ create_pre_exit (int n_entities, int *en
  20                           break;
  21                       }
  22                     copy_reg = SET_DEST (return_copy_pat);
  23 +
  24 +#ifdef EH_RETURN_STACKADJ_RTX
  25 +                   /* Skip assignments to EH_RETURN_STACKADJ_RTX.  */
  26 +                   if (rtx_equal_p (copy_reg, EH_RETURN_STACKADJ_RTX))
  27 +                     {
  28 +                       last_insn = return_copy;
  29 +                       continue;
  30 +                     }
  31 +#endif
  32                     if (GET_CODE (copy_reg) == REG)
  33                       copy_start = REGNO (copy_reg);
  34                     else if (GET_CODE (copy_reg) == SUBREG
  35 @@ -311,8 +322,8 @@ create_pre_exit (int n_entities, int *en
  36                     if (copy_start >= ret_start
  37                         && copy_start + copy_num <= ret_end)
  38                       nregs -= copy_num;
  39 -                   else if (!maybe_builtin_apply
  40 -                            || !FUNCTION_VALUE_REGNO_P (copy_start))
  41 +                   else if (!(maybe_builtin_apply
  42 +                              && FUNCTION_VALUE_REGNO_P (copy_start)))
  43                       break;
  44                     last_insn = return_copy;
  45                   }