1*4882a593Smuzhiyun /* muldi3.c extracted from gcc-2.7.2.3/libgcc2.c and
2*4882a593Smuzhiyun gcc-2.7.2.3/longlong.h which is: */
3*4882a593Smuzhiyun /* Copyright (C) 1989, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
4*4882a593Smuzhiyun
5*4882a593Smuzhiyun This file is part of GNU CC.
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun GNU CC is free software; you can redistribute it and/or modify
8*4882a593Smuzhiyun it under the terms of the GNU General Public License as published by
9*4882a593Smuzhiyun the Free Software Foundation; either version 2, or (at your option)
10*4882a593Smuzhiyun any later version.
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun GNU CC is distributed in the hope that it will be useful,
13*4882a593Smuzhiyun but WITHOUT ANY WARRANTY; without even the implied warranty of
14*4882a593Smuzhiyun MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15*4882a593Smuzhiyun GNU General Public License for more details. */
16*4882a593Smuzhiyun
17*4882a593Smuzhiyun #include <linux/compiler.h>
18*4882a593Smuzhiyun #include <linux/export.h>
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun #ifdef CONFIG_CPU_HAS_NO_MULDIV64
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun #define SI_TYPE_SIZE 32
23*4882a593Smuzhiyun #define __BITS4 (SI_TYPE_SIZE / 4)
24*4882a593Smuzhiyun #define __ll_B (1L << (SI_TYPE_SIZE / 2))
25*4882a593Smuzhiyun #define __ll_lowpart(t) ((USItype) (t) % __ll_B)
26*4882a593Smuzhiyun #define __ll_highpart(t) ((USItype) (t) / __ll_B)
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun #define umul_ppmm(w1, w0, u, v) \
29*4882a593Smuzhiyun do { \
30*4882a593Smuzhiyun USItype __x0, __x1, __x2, __x3; \
31*4882a593Smuzhiyun USItype __ul, __vl, __uh, __vh; \
32*4882a593Smuzhiyun \
33*4882a593Smuzhiyun __ul = __ll_lowpart (u); \
34*4882a593Smuzhiyun __uh = __ll_highpart (u); \
35*4882a593Smuzhiyun __vl = __ll_lowpart (v); \
36*4882a593Smuzhiyun __vh = __ll_highpart (v); \
37*4882a593Smuzhiyun \
38*4882a593Smuzhiyun __x0 = (USItype) __ul * __vl; \
39*4882a593Smuzhiyun __x1 = (USItype) __ul * __vh; \
40*4882a593Smuzhiyun __x2 = (USItype) __uh * __vl; \
41*4882a593Smuzhiyun __x3 = (USItype) __uh * __vh; \
42*4882a593Smuzhiyun \
43*4882a593Smuzhiyun __x1 += __ll_highpart (__x0);/* this can't give carry */ \
44*4882a593Smuzhiyun __x1 += __x2; /* but this indeed can */ \
45*4882a593Smuzhiyun if (__x1 < __x2) /* did we get it? */ \
46*4882a593Smuzhiyun __x3 += __ll_B; /* yes, add it in the proper pos. */ \
47*4882a593Smuzhiyun \
48*4882a593Smuzhiyun (w1) = __x3 + __ll_highpart (__x1); \
49*4882a593Smuzhiyun (w0) = __ll_lowpart (__x1) * __ll_B + __ll_lowpart (__x0); \
50*4882a593Smuzhiyun } while (0)
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun #else
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun #define umul_ppmm(w1, w0, u, v) \
55*4882a593Smuzhiyun __asm__ ("mulu%.l %3,%1:%0" \
56*4882a593Smuzhiyun : "=d" ((USItype)(w0)), \
57*4882a593Smuzhiyun "=d" ((USItype)(w1)) \
58*4882a593Smuzhiyun : "%0" ((USItype)(u)), \
59*4882a593Smuzhiyun "dmi" ((USItype)(v)))
60*4882a593Smuzhiyun
61*4882a593Smuzhiyun #endif
62*4882a593Smuzhiyun
63*4882a593Smuzhiyun #define __umulsidi3(u, v) \
64*4882a593Smuzhiyun ({DIunion __w; \
65*4882a593Smuzhiyun umul_ppmm (__w.s.high, __w.s.low, u, v); \
66*4882a593Smuzhiyun __w.ll; })
67*4882a593Smuzhiyun
68*4882a593Smuzhiyun typedef int SItype __mode(SI);
69*4882a593Smuzhiyun typedef unsigned int USItype __mode(SI);
70*4882a593Smuzhiyun typedef int DItype __mode(DI);
71*4882a593Smuzhiyun typedef int word_type __mode(__word__);
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun struct DIstruct {SItype high, low;};
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun typedef union
76*4882a593Smuzhiyun {
77*4882a593Smuzhiyun struct DIstruct s;
78*4882a593Smuzhiyun DItype ll;
79*4882a593Smuzhiyun } DIunion;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun DItype
__muldi3(DItype u,DItype v)82*4882a593Smuzhiyun __muldi3 (DItype u, DItype v)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun DIunion w;
85*4882a593Smuzhiyun DIunion uu, vv;
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun uu.ll = u,
88*4882a593Smuzhiyun vv.ll = v;
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun w.ll = __umulsidi3 (uu.s.low, vv.s.low);
91*4882a593Smuzhiyun w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
92*4882a593Smuzhiyun + (USItype) uu.s.high * (USItype) vv.s.low);
93*4882a593Smuzhiyun
94*4882a593Smuzhiyun return w.ll;
95*4882a593Smuzhiyun }
96*4882a593Smuzhiyun EXPORT_SYMBOL(__muldi3);
97