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 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #if defined(CONFIG_M68000) || defined(CONFIG_COLDFIRE)
23
24 #define SI_TYPE_SIZE 32
25 #define __BITS4 (SI_TYPE_SIZE / 4)
26 #define __ll_B (1L << (SI_TYPE_SIZE / 2))
27 #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
28 #define __ll_highpart(t) ((USItype) (t) / __ll_B)
29
30 #define umul_ppmm(w1, w0, u, v) \
31 do { \
32 USItype __x0, __x1, __x2, __x3; \
33 USItype __ul, __vl, __uh, __vh; \
34 \
35 __ul = __ll_lowpart (u); \
36 __uh = __ll_highpart (u); \
37 __vl = __ll_lowpart (v); \
38 __vh = __ll_highpart (v); \
39 \
40 __x0 = (USItype) __ul * __vl; \
41 __x1 = (USItype) __ul * __vh; \
42 __x2 = (USItype) __uh * __vl; \
43 __x3 = (USItype) __uh * __vh; \
44 \
45 __x1 += __ll_highpart (__x0);/* this can't give carry */ \
46 __x1 += __x2; /* but this indeed can */ \
47 if (__x1 < __x2) /* did we get it? */ \
48 __x3 += __ll_B; /* yes, add it in the proper pos. */ \
49 \
50 (w1) = __x3 + __ll_highpart (__x1); \
51 (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
52 } while (0)
53
54 #else
55
56 #define umul_ppmm(w1, w0, u, v) \
57 __asm__ ("mulu%.l %3,%1:%0" \
58 : "=d" ((USItype)(w0)), \
59 "=d" ((USItype)(w1)) \
60 : "%0" ((USItype)(u)), \
61 "dmi" ((USItype)(v)))
62
63 #endif
64
65 #define __umulsidi3(u, v) \
66 ({DIunion __w; \
67 umul_ppmm (__w.s.high, __w.s.low, u, v); \
68 __w.ll; })
69
70 typedef int SItype __attribute__ ((mode (SI)));
71 typedef unsigned int USItype __attribute__ ((mode (SI)));
72 typedef int DItype __attribute__ ((mode (DI)));
73 typedef int word_type __attribute__ ((mode (__word__)));
74
75 struct DIstruct {SItype high, low;};
76
77 typedef union
78 {
79 struct DIstruct s;
80 DItype ll;
81 } DIunion;
82
83 DItype
__muldi3(DItype u,DItype v)84 __muldi3 (DItype u, DItype v)
85 {
86 DIunion w;
87 DIunion uu, vv;
88
89 uu.ll = u,
90 vv.ll = v;
91
92 w.ll = __umulsidi3 (uu.s.low, vv.s.low);
93 w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
94 + (USItype) uu.s.high * (USItype) vv.s.low);
95
96 return w.ll;
97 }
98