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
20 #ifdef CONFIG_CPU_HAS_NO_MULDIV64
21
22 #define SI_TYPE_SIZE 32
23 #define __BITS4 (SI_TYPE_SIZE / 4)
24 #define __ll_B (1L << (SI_TYPE_SIZE / 2))
25 #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
26 #define __ll_highpart(t) ((USItype) (t) / __ll_B)
27
28 #define umul_ppmm(w1, w0, u, v) \
29 do { \
30 USItype __x0, __x1, __x2, __x3; \
31 USItype __ul, __vl, __uh, __vh; \
32 \
33 __ul = __ll_lowpart (u); \
34 __uh = __ll_highpart (u); \
35 __vl = __ll_lowpart (v); \
36 __vh = __ll_highpart (v); \
37 \
38 __x0 = (USItype) __ul * __vl; \
39 __x1 = (USItype) __ul * __vh; \
40 __x2 = (USItype) __uh * __vl; \
41 __x3 = (USItype) __uh * __vh; \
42 \
43 __x1 += __ll_highpart (__x0);/* this can't give carry */ \
44 __x1 += __x2; /* but this indeed can */ \
45 if (__x1 < __x2) /* did we get it? */ \
46 __x3 += __ll_B; /* yes, add it in the proper pos. */ \
47 \
48 (w1) = __x3 + __ll_highpart (__x1); \
49 (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
50 } while (0)
51
52 #else
53
54 #define umul_ppmm(w1, w0, u, v) \
55 __asm__ ("mulu%.l %3,%1:%0" \
56 : "=d" ((USItype)(w0)), \
57 "=d" ((USItype)(w1)) \
58 : "%0" ((USItype)(u)), \
59 "dmi" ((USItype)(v)))
60
61 #endif
62
63 #define __umulsidi3(u, v) \
64 ({DIunion __w; \
65 umul_ppmm (__w.s.high, __w.s.low, u, v); \
66 __w.ll; })
67
68 typedef int SItype __mode(SI);
69 typedef unsigned int USItype __mode(SI);
70 typedef int DItype __mode(DI);
71 typedef int word_type __mode(__word__);
72
73 struct DIstruct {SItype high, low;};
74
75 typedef union
76 {
77 struct DIstruct s;
78 DItype ll;
79 } DIunion;
80
81 DItype
82 __muldi3 (DItype u, DItype v)
83 {
84 DIunion w;
85 DIunion uu, vv;
86
87 uu.ll = u,
88 vv.ll = v;
89
90 w.ll = __umulsidi3 (uu.s.low, vv.s.low);
91 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
92 + (USItype) uu.s.high * (USItype) vv.s.low);
93
94 return w.ll;
95 }
96 EXPORT_SYMBOL(__muldi3);