1 | /* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and |
2 | gcc-2.7.2.3/longlong.h which is: */ |
3 | /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc. |
4 | |
5 | This file is part of GNU CC. |
6 | |
7 | GNU CC is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by |
9 | the Free Software Foundation; either version 2, or (at your option) |
10 | any later version. |
11 | |
12 | GNU CC is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
15 | GNU General Public License for more details. */ |
16 | |
17 | #include <linux/compiler.h> |
18 | #include <linux/export.h> |
19 | #include <linux/libgcc.h> |
20 | |
21 | #ifdef CONFIG_CPU_HAS_NO_MULDIV64 |
22 | |
23 | #define SI_TYPE_SIZE 32 |
24 | #define __BITS4 (SI_TYPE_SIZE / 4) |
25 | #define __ll_B (1L << (SI_TYPE_SIZE / 2)) |
26 | #define __ll_lowpart(t) ((USItype) (t) % __ll_B) |
27 | #define __ll_highpart(t) ((USItype) (t) / __ll_B) |
28 | |
29 | #define umul_ppmm(w1, w0, u, v) \ |
30 | do { \ |
31 | USItype __x0, __x1, __x2, __x3; \ |
32 | USItype __ul, __vl, __uh, __vh; \ |
33 | \ |
34 | __ul = __ll_lowpart (u); \ |
35 | __uh = __ll_highpart (u); \ |
36 | __vl = __ll_lowpart (v); \ |
37 | __vh = __ll_highpart (v); \ |
38 | \ |
39 | __x0 = (USItype) __ul * __vl; \ |
40 | __x1 = (USItype) __ul * __vh; \ |
41 | __x2 = (USItype) __uh * __vl; \ |
42 | __x3 = (USItype) __uh * __vh; \ |
43 | \ |
44 | __x1 += __ll_highpart (__x0);/* this can't give carry */ \ |
45 | __x1 += __x2; /* but this indeed can */ \ |
46 | if (__x1 < __x2) /* did we get it? */ \ |
47 | __x3 += __ll_B; /* yes, add it in the proper pos. */ \ |
48 | \ |
49 | (w1) = __x3 + __ll_highpart (__x1); \ |
50 | (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \ |
51 | } while (0) |
52 | |
53 | #else |
54 | |
55 | #define umul_ppmm(w1, w0, u, v) \ |
56 | __asm__ ("mulu%.l %3,%1:%0" \ |
57 | : "=d" ((USItype)(w0)), \ |
58 | "=d" ((USItype)(w1)) \ |
59 | : "%0" ((USItype)(u)), \ |
60 | "dmi" ((USItype)(v))) |
61 | |
62 | #endif |
63 | |
64 | #define __umulsidi3(u, v) \ |
65 | ({DIunion __w; \ |
66 | umul_ppmm (__w.s.high, __w.s.low, u, v); \ |
67 | __w.ll; }) |
68 | |
69 | typedef int SItype __mode(SI); |
70 | typedef unsigned int USItype __mode(SI); |
71 | typedef int DItype __mode(DI); |
72 | typedef int word_type __mode(__word__); |
73 | |
74 | struct DIstruct {SItype high, low;}; |
75 | |
76 | typedef union |
77 | { |
78 | struct DIstruct s; |
79 | DItype ll; |
80 | } DIunion; |
81 | |
82 | DItype |
83 | __muldi3 (DItype u, DItype v) |
84 | { |
85 | DIunion w; |
86 | DIunion uu, vv; |
87 | |
88 | uu.ll = u; |
89 | vv.ll = v; |
90 | |
91 | w.ll = __umulsidi3 (uu.s.low, vv.s.low); |
92 | w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high |
93 | + (USItype) uu.s.high * (USItype) vv.s.low); |
94 | |
95 | return w.ll; |
96 | } |
97 | EXPORT_SYMBOL(__muldi3); |
98 | |