]>
Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
d64af918 | 2 | #include <linux/export.h> |
3370d82f MS |
3 | |
4 | #include "libgcc.h" | |
5 | ||
3370d82f MS |
6 | #define W_TYPE_SIZE 32 |
7 | ||
a671de08 MS |
8 | #define __ll_B ((unsigned long) 1 << (W_TYPE_SIZE / 2)) |
9 | #define __ll_lowpart(t) ((unsigned long) (t) & (__ll_B - 1)) | |
10 | #define __ll_highpart(t) ((unsigned long) (t) >> (W_TYPE_SIZE / 2)) | |
3370d82f MS |
11 | |
12 | /* If we still don't have umul_ppmm, define it using plain C. */ | |
13 | #if !defined(umul_ppmm) | |
14 | #define umul_ppmm(w1, w0, u, v) \ | |
15 | do { \ | |
a671de08 MS |
16 | unsigned long __x0, __x1, __x2, __x3; \ |
17 | unsigned short __ul, __vl, __uh, __vh; \ | |
3370d82f MS |
18 | \ |
19 | __ul = __ll_lowpart(u); \ | |
20 | __uh = __ll_highpart(u); \ | |
21 | __vl = __ll_lowpart(v); \ | |
22 | __vh = __ll_highpart(v); \ | |
23 | \ | |
a671de08 MS |
24 | __x0 = (unsigned long) __ul * __vl; \ |
25 | __x1 = (unsigned long) __ul * __vh; \ | |
26 | __x2 = (unsigned long) __uh * __vl; \ | |
27 | __x3 = (unsigned long) __uh * __vh; \ | |
3370d82f MS |
28 | \ |
29 | __x1 += __ll_highpart(__x0); /* this can't give carry */\ | |
30 | __x1 += __x2; /* but this indeed can */ \ | |
31 | if (__x1 < __x2) /* did we get it? */ \ | |
32 | __x3 += __ll_B; /* yes, add it in the proper pos */ \ | |
33 | \ | |
34 | (w1) = __x3 + __ll_highpart(__x1); \ | |
35 | (w0) = __ll_lowpart(__x1) * __ll_B + __ll_lowpart(__x0);\ | |
36 | } while (0) | |
37 | #endif | |
38 | ||
39 | #if !defined(__umulsidi3) | |
40 | #define __umulsidi3(u, v) ({ \ | |
41 | DWunion __w; \ | |
42 | umul_ppmm(__w.s.high, __w.s.low, u, v); \ | |
43 | __w.ll; \ | |
44 | }) | |
45 | #endif | |
46 | ||
a671de08 | 47 | long long __muldi3(long long u, long long v) |
3370d82f MS |
48 | { |
49 | const DWunion uu = {.ll = u}; | |
50 | const DWunion vv = {.ll = v}; | |
51 | DWunion w = {.ll = __umulsidi3(uu.s.low, vv.s.low)}; | |
52 | ||
a671de08 MS |
53 | w.s.high += ((unsigned long) uu.s.low * (unsigned long) vv.s.high |
54 | + (unsigned long) uu.s.high * (unsigned long) vv.s.low); | |
3370d82f MS |
55 | |
56 | return w.ll; | |
57 | } | |
d50c3036 | 58 | EXPORT_SYMBOL(__muldi3); |