Merge tag 'drm-intel-next-2017-12-01' of git://anongit.freedesktop.org/drm/drm-intel...
[linux-2.6-microblaze.git] / arch / m68k / lib / muldi3.c
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);