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aa4945c1 JB |
1 | /* _divsi3 for Lattice Mico32. |
2 | Contributed by Jon Beniston <jon@beniston.com> | |
3 | ||
a945c346 | 4 | Copyright (C) 2009-2024 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 division. */ | |
28 | ||
29 | static const UQItype __divsi3_table[] = { | |
30 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
31 | 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
32 | 0, 2, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
33 | 0, 3, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
34 | 0, 4, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
35 | 0, 5, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
36 | 0, 6, 3, 2, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
37 | 0, 7, 3, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, | |
38 | 0, 8, 4, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, | |
39 | 0, 9, 4, 3, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, | |
40 | 0, 10, 5, 3, 2, 2, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, | |
41 | 0, 11, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, | |
42 | 0, 12, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 0, 0, 0, | |
43 | 0, 13, 6, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, 0, | |
44 | 0, 14, 7, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 0, | |
45 | 0, 15, 7, 5, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, | |
46 | }; | |
47 | ||
48 | SItype | |
49 | __divsi3 (SItype a, SItype b) | |
50 | { | |
51 | int neg = 0; | |
52 | SItype res; | |
53 | int cfg; | |
54 | ||
55 | if (b == 0) | |
56 | { | |
57 | /* Raise divide by zero exception. */ | |
58 | int eba, sr; | |
59 | /* Save interrupt enable. */ | |
60 | __asm__ __volatile__ ("rcsr %0, IE":"=r" (sr)); | |
61 | sr = (sr & 1) << 1; | |
62 | __asm__ __volatile__ ("wcsr IE, %0"::"r" (sr)); | |
63 | /* Branch to exception handler. */ | |
64 | __asm__ __volatile__ ("rcsr %0, EBA":"=r" (eba)); | |
65 | eba += 32 * 5; | |
66 | __asm__ __volatile__ ("mv ea, ra"); | |
67 | __asm__ __volatile__ ("b %0"::"r" (eba)); | |
68 | __builtin_unreachable (); | |
69 | } | |
70 | ||
71 | if (((USItype) (a | b)) < 16) | |
72 | res = __divsi3_table[(a << 4) + b]; | |
73 | else | |
74 | { | |
75 | ||
76 | if (a < 0) | |
77 | { | |
78 | a = -a; | |
79 | neg = !neg; | |
80 | } | |
81 | ||
82 | if (b < 0) | |
83 | { | |
84 | b = -b; | |
85 | neg = !neg; | |
86 | } | |
87 | ||
88 | __asm__ ("rcsr %0, CFG":"=r" (cfg)); | |
89 | if (cfg & 2) | |
90 | __asm__ ("divu %0, %1, %2": "=r" (res):"r" (a), "r" (b)); | |
91 | else | |
92 | res = __udivmodsi4 (a, b, 0); | |
93 | ||
94 | if (neg) | |
95 | res = -res; | |
96 | } | |
97 | ||
98 | return res; | |
99 | } |