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1 /* Definitions for PA_RISC with ELF format on 64-bit Linux
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145
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2 Copyright (C) 1999-2020 Free Software Foundation, Inc.
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0
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #if 0 /* needs some work :-( */
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21 /* If defined, this macro specifies a table of register pairs used to
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22 eliminate unneeded registers that point into the stack frame. */
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23
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24 #define ELIMINABLE_REGS \
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25 { \
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26 {FRAME_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
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27 {ARG_POINTER_REGNUM, STACK_POINTER_REGNUM}, \
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28 {ARG_POINTER_REGNUM, FRAME_POINTER_REGNUM}, \
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29 }
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30
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111
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31 /* This macro returns the initial difference between the specified pair
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32 of registers. */
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0
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33 #define INITIAL_ELIMINATION_OFFSET(FROM, TO, OFFSET) \
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34 do \
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35 { \
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36 int fsize; \
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37 \
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111
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38 fsize = pa_compute_frame_size (get_frame_size (), 0); \
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0
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39 if ((TO) == FRAME_POINTER_REGNUM \
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40 && (FROM) == ARG_POINTER_REGNUM) \
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41 { \
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42 (OFFSET) = -16; \
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43 break; \
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44 } \
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45 \
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46 gcc_assert ((TO) == STACK_POINTER_REGNUM); \
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47 \
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48 switch (FROM) \
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49 { \
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50 case FRAME_POINTER_REGNUM: \
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51 (OFFSET) = - fsize; \
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52 break; \
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53 \
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54 case ARG_POINTER_REGNUM: \
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55 (OFFSET) = - fsize - 16; \
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56 break; \
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57 \
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58 default: \
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59 gcc_unreachable (); \
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60 } \
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61 } while (0)
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62 #endif
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