projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 2b30df17 RM |
1 | /* mc68020 __mpn_add_n -- Add two limb vectors of the same length > 0 and store |
| 2 | sum in a third limb vector. | |
| 3 | ||
| 56d7f029 | 4 | Copyright (C) 1992, 1994, 1996, 1998 Free Software Foundation, Inc. |
| 2b30df17 RM |
5 | |
| 6 | This file is part of the GNU MP Library. | |
| 7 | ||
| 8 | The GNU MP Library is free software; you can redistribute it and/or modify | |
| 9 | it under the terms of the GNU Library General Public License as published by | |
| 10 | the Free Software Foundation; either version 2 of the License, or (at your | |
| 11 | option) any later version. | |
| 12 | ||
| 13 | The GNU MP Library is distributed in the hope that it will be useful, but | |
| 14 | WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
| 15 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public | |
| 16 | License for more details. | |
| 17 | ||
| 18 | You should have received a copy of the GNU Library General Public License | |
| 19 | along with the GNU MP Library; see the file COPYING.LIB. If not, write to | |
| 6c07070b RM |
20 | the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, |
| 21 | MA 02111-1307, USA. */ | |
| 2b30df17 RM |
22 | |
| 23 | /* | |
| 24 | INPUT PARAMETERS | |
| 25 | res_ptr (sp + 4) | |
| 26 | s1_ptr (sp + 8) | |
| 27 | s2_ptr (sp + 16) | |
| 28 | size (sp + 12) | |
| 29 | */ | |
| 30 | ||
| 3de9f02e | 31 | #include "sysdep.h" |
| 2b30df17 RM |
32 | #include "asm-syntax.h" |
| 33 | ||
| 34 | TEXT | |
| 56d7f029 | 35 | ENTRY(__mpn_add_n) |
| 2b30df17 | 36 | /* Save used registers on the stack. */ |
| 3de9f02e RM |
37 | movel R(d2),MEM_PREDEC(sp) |
| 38 | movel R(a2),MEM_PREDEC(sp) | |
| 2b30df17 RM |
39 | |
| 40 | /* Copy the arguments to registers. Better use movem? */ | |
| 3de9f02e RM |
41 | movel MEM_DISP(sp,12),R(a2) |
| 42 | movel MEM_DISP(sp,16),R(a0) | |
| 43 | movel MEM_DISP(sp,20),R(a1) | |
| 44 | movel MEM_DISP(sp,24),R(d2) | |
| 45 | ||
| 46 | eorw #1,R(d2) | |
| 47 | lsrl #1,R(d2) | |
| 48 | bcc L(L1) | |
| 49 | subql #1,R(d2) /* clears cy as side effect */ | |
| 50 | ||
| 51 | L(Loop:) | |
| 52 | movel MEM_POSTINC(a0),R(d0) | |
| 53 | movel MEM_POSTINC(a1),R(d1) | |
| 54 | addxl R(d1),R(d0) | |
| 55 | movel R(d0),MEM_POSTINC(a2) | |
| 56 | L(L1:) movel MEM_POSTINC(a0),R(d0) | |
| 57 | movel MEM_POSTINC(a1),R(d1) | |
| 58 | addxl R(d1),R(d0) | |
| 59 | movel R(d0),MEM_POSTINC(a2) | |
| 60 | ||
| 61 | dbf R(d2),L(Loop) /* loop until 16 lsb of %4 == -1 */ | |
| 62 | subxl R(d0),R(d0) /* d0 <= -cy; save cy as 0 or -1 in d0 */ | |
| 63 | subl #0x10000,R(d2) | |
| 64 | bcs L(L2) | |
| 65 | addl R(d0),R(d0) /* restore cy */ | |
| 66 | bra L(Loop) | |
| 67 | ||
| 68 | L(L2:) | |
| 69 | negl R(d0) | |
| 2b30df17 RM |
70 | |
| 71 | /* Restore used registers from stack frame. */ | |
| 3de9f02e RM |
72 | movel MEM_POSTINC(sp),R(a2) |
| 73 | movel MEM_POSTINC(sp),R(d2) | |
| 2b30df17 RM |
74 | |
| 75 | rts | |
| 56d7f029 | 76 | END(__mpn_add_n) |