gcc/config/pa/pa64-linux.h

   1 /* Definitions for PA_RISC with ELF format on 64-bit Linux
   2    Copyright (C) 1999-2019 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20 #if 0 /* needs some work :-( */
  21 /* If defined, this macro specifies a table of register pairs used to
  22    eliminate unneeded registers that point into the stack frame.  */
  23
  24 #define ELIMINABLE_REGS                                                 \
  25 {                                                                       \
  26   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},                         \
  27   {ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
  28   {ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM},                         \
  29 }
  30
  31 /* This macro returns the initial difference between the specified pair
  32    of registers.  */
  33 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
  34   do                                                            \
  35     {                                                           \
  36       int fsize;                                                \
  37                                                                 \
  38       fsize = pa_compute_frame_size (get_frame_size (), 0);     \
  39       if ((TO) == FRAME_POINTER_REGNUM                          \
  40           && (FROM) == ARG_POINTER_REGNUM)                      \
  41         {                                                       \
  42           (OFFSET) = -16;                                       \
  43           break;                                                \
  44         }                                                       \
  45                                                                 \
  46       gcc_assert ((TO) == STACK_POINTER_REGNUM);                \
  47                                                                 \
  48       switch (FROM)                                             \
  49         {                                                       \
  50         case FRAME_POINTER_REGNUM:                              \
  51           (OFFSET) = - fsize;                                   \
  52           break;                                                \
  53                                                                 \
  54         case ARG_POINTER_REGNUM:                                \
  55           (OFFSET) = - fsize - 16;                              \
  56           break;                                                \
  57                                                                 \
  58         default:                                                \
  59           gcc_unreachable ();                                   \
  60         }                                                       \
  61     } while (0)
  62 #endif