1#include <linux/export.h>
2
3#include "libgcc.h"
4
5#define W_TYPE_SIZE 32
6
7#define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
8#define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
9#define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
10
11/* If we still don't have umul_ppmm, define it using plain C.  */
12#if !defined(umul_ppmm)
13#define umul_ppmm(w1, w0, u, v)						\
14	do {								\
15		unsigned long __x0, __x1, __x2, __x3;			\
16		unsigned short __ul, __vl, __uh, __vh;			\
17									\
18		__ul = __ll_lowpart(u);					\
19		__uh = __ll_highpart(u);				\
20		__vl = __ll_lowpart(v);					\
21		__vh = __ll_highpart(v);				\
22									\
23		__x0 = (unsigned long) __ul * __vl;			\
24		__x1 = (unsigned long) __ul * __vh;			\
25		__x2 = (unsigned long) __uh * __vl;			\
26		__x3 = (unsigned long) __uh * __vh;			\
27									\
28		__x1 += __ll_highpart(__x0); /* this can't give carry */\
29		__x1 += __x2; /* but this indeed can */			\
30		if (__x1 < __x2) /* did we get it? */			\
31		__x3 += __ll_B; /* yes, add it in the proper pos */	\
32									\
33		(w1) = __x3 + __ll_highpart(__x1);			\
34		(w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
35	} while (0)
36#endif
37
38#if !defined(__umulsidi3)
39#define __umulsidi3(u, v) ({				\
40	DWunion __w;					\
41	umul_ppmm(__w.s.high, __w.s.low, u, v);		\
42	__w.ll;						\
43	})
44#endif
45
46long long __muldi3(long long u, long long v)
47{
48	const DWunion uu = {.ll = u};
49	const DWunion vv = {.ll = v};
50	DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
51
52	w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
53		+ (unsigned long) uu.s.high * (unsigned long) vv.s.low);
54
55	return w.ll;
56}
57EXPORT_SYMBOL(__muldi3);
58