1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
|
// SPDX-License-Identifier: GPL-2.0+
/*
* U-Boot - muldi3.c contains routines for mult and div
*
*/
/* Generic function got from GNU gcc package, libgcc2.c */
#ifndef SI_TYPE_SIZE
#define SI_TYPE_SIZE 32
#endif
#define __ll_B (1L << (SI_TYPE_SIZE / 2))
#define __ll_lowpart(t) ((USItype) (t) % __ll_B)
#define __ll_highpart(t) ((USItype) (t) / __ll_B)
#define BITS_PER_UNIT 8
#if !defined(umul_ppmm)
#define umul_ppmm(w1, w0, u, v) \
do { \
USItype __x0, __x1, __x2, __x3; \
USItype __ul, __vl, __uh, __vh; \
\
__ul = __ll_lowpart(u); \
__uh = __ll_highpart(u); \
__vl = __ll_lowpart(v); \
__vh = __ll_highpart(v); \
\
__x0 = (USItype) __ul * __vl; \
__x1 = (USItype) __ul * __vh; \
__x2 = (USItype) __uh * __vl; \
__x3 = (USItype) __uh * __vh; \
\
__x1 += __ll_highpart(__x0); /* this can't give carry */\
__x1 += __x2; /* but this indeed can */ \
if (__x1 < __x2) /* did we get it? */ \
__x3 += __ll_B; /* yes, add it in the proper pos. */ \
\
(w1) = __x3 + __ll_highpart(__x1); \
(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
} while (0)
#endif
#if !defined(__umulsidi3)
#define __umulsidi3(u, v) \
({DIunion __w; \
umul_ppmm(__w.s.high, __w.s.low, u, v); \
__w.ll; })
#endif
typedef unsigned int USItype __attribute__ ((mode(SI)));
typedef int SItype __attribute__ ((mode(SI)));
typedef int DItype __attribute__ ((mode(DI)));
typedef int word_type __attribute__ ((mode(__word__)));
struct DIstruct {
SItype low, high;
};
typedef union {
struct DIstruct s;
DItype ll;
} DIunion;
DItype __muldi3(DItype u, DItype v)
{
DIunion w;
DIunion uu, vv;
uu.ll = u, vv.ll = v;
/* panic("kernel panic for __muldi3"); */
w.ll = __umulsidi3(uu.s.low, vv.s.low);
w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
+ (USItype) uu.s.high * (USItype) vv.s.low);
return w.ll;
}
|