gnu/dist/gcc4/gcc/config/pa/pa64-linux.h

   1 /* Definitions for PA_RISC with ELF format on 64-bit Linux
   2    Copyright (C) 1999, 2000, 2002 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 2, 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 COPYING.  If not, write to
  18 the Free Software Foundation, 51 Franklin Street, Fifth Floor,
  19 Boston, MA 02110-1301, USA.  */
  20
  21 #if 0 /* needs some work :-( */
  22 /* If defined, this macro specifies a table of register pairs used to
  23    eliminate unneeded registers that point into the stack frame.  */
  24
  25 #define ELIMINABLE_REGS                                                 \
  26 {                                                                       \
  27   {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM},                         \
  28   {ARG_POINTER_REGNUM,   STACK_POINTER_REGNUM},                         \
  29   {ARG_POINTER_REGNUM,   FRAME_POINTER_REGNUM},                         \
  30 }
  31
  32 /* A C expression that returns nonzero if the compiler is allowed to try to
  33    replace register number FROM with register number TO.  The frame pointer
  34    is automatically handled.  */
  35
  36 #define CAN_ELIMINATE(FROM, TO) 1
  37
  38 /* This macro is similar to `INITIAL_FRAME_POINTER_OFFSET'.  It
  39    specifies the initial difference between the specified pair of
  40    registers.  This macro must be defined if `ELIMINABLE_REGS' is
  41    defined.  */
  42 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
  43   do                                                            \
  44     {                                                           \
  45       int fsize;                                                \
  46                                                                 \
  47       fsize = compute_frame_size (get_frame_size (), 0);        \
  48       if ((TO) == FRAME_POINTER_REGNUM                          \
  49           && (FROM) == ARG_POINTER_REGNUM)                      \
  50         {                                                       \
  51           (OFFSET) = -16;                                       \
  52           break;                                                \
  53         }                                                       \
  54                                                                 \
  55       gcc_assert ((TO) == STACK_POINTER_REGNUM);                \
  56                                                                 \
  57       switch (FROM)                                             \
  58         {                                                       \
  59         case FRAME_POINTER_REGNUM:                              \
  60           (OFFSET) = - fsize;                                   \
  61           break;                                                \
  62                                                                 \
  63         case ARG_POINTER_REGNUM:                                \
  64           (OFFSET) = - fsize - 16;                              \
  65           break;                                                \
  66                                                                 \
  67         default:                                                \
  68           gcc_unreachable ();                                   \
  69         }                                                       \
  70     } while (0)
  71 #endif