Mercurial > hg > CbC > CbC_gcc
comparison libgcc/config/lm32/_modsi3.c @ 55:77e2b8dfacca gcc-4.4.5
update it from 4.4.3 to 4.5.0
author | ryoma <e075725@ie.u-ryukyu.ac.jp> |
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date | Fri, 12 Feb 2010 23:39:51 +0900 |
parents | |
children | 04ced10e8804 |
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52:c156f1bd5cd9 | 55:77e2b8dfacca |
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1 /* _modsi3 for Lattice Mico32. | |
2 Contributed by Jon Beniston <jon@beniston.com> | |
3 | |
4 Copyright (C) 2009 Free Software Foundation, Inc. | |
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 } |