1/* Definitions for PA_RISC with ELF format on 64-bit Linux
2   Copyright (C) 1999-2022 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along 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
63