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 72