projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| aa4945c1 JB |
1 | /* _modsi3 for Lattice Mico32. |
| 2 | Contributed by Jon Beniston <jon@beniston.com> | |
| 3 | ||
| 8d9254fc | 4 | Copyright (C) 2009-2020 Free Software Foundation, Inc. |
| aa4945c1 JB |
5 | |
| 6 | This file is free software; you can redistribute it and/or modify it | |
| 7 | under the terms of the GNU General Public License as published by the | |
| 8 | Free Software Foundation; either version 3, or (at your option) any | |
| 9 | later version. | |
| 10 | ||
| 11 | This file is distributed in the hope that it will be useful, but | |
| 12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 14 | General Public License for more details. | |
| 15 | ||
| 16 | Under Section 7 of GPL version 3, you are granted additional | |
| 17 | permissions described in the GCC Runtime Library Exception, version | |
| 18 | 3.1, as published by the Free Software Foundation. | |
| 19 | ||
| 20 | You should have received a copy of the GNU General Public License and | |
| 21 | a copy of the GCC Runtime Library Exception along with this program; | |
| 22 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
| 23 | <http://www.gnu.org/licenses/>. */ | |
| 24 | ||
| 25 | #include "libgcc_lm32.h" | |
| 26 | ||
| 27 | /* Signed integer modulus. */ | |
| 28 | ||
| 29 | SItype | |
| 30 | __modsi3 (SItype a, SItype b) | |
| 31 | { | |
| 32 | int neg = 0; | |
| 33 | SItype res; | |
| 34 | int cfg; | |
| 35 | ||
| 36 | if (b == 0) | |
| 37 | { | |
| 38 | /* Raise divide by zero exception. */ | |
| 39 | int eba, sr; | |
| 40 | /* Save interrupt enable. */ | |
| 41 | __asm__ __volatile__ ("rcsr %0, IE":"=r" (sr)); | |
| 42 | sr = (sr & 1) << 1; | |
| 43 | __asm__ __volatile__ ("wcsr IE, %0"::"r" (sr)); | |
| 44 | /* Branch to exception handler. */ | |
| 45 | __asm__ __volatile__ ("rcsr %0, EBA":"=r" (eba)); | |
| 46 | eba += 32 * 5; | |
| 47 | __asm__ __volatile__ ("mv ea, ra"); | |
| 48 | __asm__ __volatile__ ("b %0"::"r" (eba)); | |
| 49 | __builtin_unreachable (); | |
| 50 | } | |
| 51 | ||
| 52 | if (a < 0) | |
| 53 | { | |
| 54 | a = -a; | |
| 55 | neg = 1; | |
| 56 | } | |
| 57 | ||
| 58 | if (b < 0) | |
| 59 | b = -b; | |
| 60 | ||
| 61 | __asm__ ("rcsr %0, CFG":"=r" (cfg)); | |
| 62 | if (cfg & 2) | |
| 63 | __asm__ ("modu %0, %1, %2": "=r" (res):"r" (a), "r" (b)); | |
| 64 | else | |
| 65 | res = __udivmodsi4 (a, b, 1); | |
| 66 | ||
| 67 | if (neg) | |
| 68 | res = -res; | |
| 69 | ||
| 70 | return res; | |
| 71 | } |