1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <linux/export.h>
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include "libgcc.h"
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #define W_TYPE_SIZE 32
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2))
9*4882a593Smuzhiyun #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1))
10*4882a593Smuzhiyun #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2))
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun /* If we still don't have umul_ppmm, define it using plain C. */
13*4882a593Smuzhiyun #if !defined(umul_ppmm)
14*4882a593Smuzhiyun #define umul_ppmm(w1, w0, u, v) \
15*4882a593Smuzhiyun do { \
16*4882a593Smuzhiyun unsigned long __x0, __x1, __x2, __x3; \
17*4882a593Smuzhiyun unsigned short __ul, __vl, __uh, __vh; \
18*4882a593Smuzhiyun \
19*4882a593Smuzhiyun __ul = __ll_lowpart(u); \
20*4882a593Smuzhiyun __uh = __ll_highpart(u); \
21*4882a593Smuzhiyun __vl = __ll_lowpart(v); \
22*4882a593Smuzhiyun __vh = __ll_highpart(v); \
23*4882a593Smuzhiyun \
24*4882a593Smuzhiyun __x0 = (unsigned long) __ul * __vl; \
25*4882a593Smuzhiyun __x1 = (unsigned long) __ul * __vh; \
26*4882a593Smuzhiyun __x2 = (unsigned long) __uh * __vl; \
27*4882a593Smuzhiyun __x3 = (unsigned long) __uh * __vh; \
28*4882a593Smuzhiyun \
29*4882a593Smuzhiyun __x1 += __ll_highpart(__x0); /* this can't give carry */\
30*4882a593Smuzhiyun __x1 += __x2; /* but this indeed can */ \
31*4882a593Smuzhiyun if (__x1 < __x2) /* did we get it? */ \
32*4882a593Smuzhiyun __x3 += __ll_B; /* yes, add it in the proper pos */ \
33*4882a593Smuzhiyun \
34*4882a593Smuzhiyun (w1) = __x3 + __ll_highpart(__x1); \
35*4882a593Smuzhiyun (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\
36*4882a593Smuzhiyun } while (0)
37*4882a593Smuzhiyun #endif
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #if !defined(__umulsidi3)
40*4882a593Smuzhiyun #define __umulsidi3(u, v) ({ \
41*4882a593Smuzhiyun DWunion __w; \
42*4882a593Smuzhiyun umul_ppmm(__w.s.high, __w.s.low, u, v); \
43*4882a593Smuzhiyun __w.ll; \
44*4882a593Smuzhiyun })
45*4882a593Smuzhiyun #endif
46*4882a593Smuzhiyun
__muldi3(long long u,long long v)47*4882a593Smuzhiyun long long __muldi3(long long u, long long v)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun const DWunion uu = {.ll = u};
50*4882a593Smuzhiyun const DWunion vv = {.ll = v};
51*4882a593Smuzhiyun DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)};
52*4882a593Smuzhiyun
53*4882a593Smuzhiyun w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high
54*4882a593Smuzhiyun + (unsigned long) uu.s.high * (unsigned long) vv.s.low);
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun return w.ll;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun EXPORT_SYMBOL(__muldi3);
59