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d64af918 | 1 | #include <linux/export.h> |
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2 | |
3 | #include "libgcc.h" | |
4 | ||
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5 | #define W_TYPE_SIZE 32 |
6 | ||
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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)) | |
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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 { \ | |
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15 | unsigned long __x0, __x1, __x2, __x3; \ |
16 | unsigned short __ul, __vl, __uh, __vh; \ | |
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17 | \ |
18 | __ul = __ll_lowpart(u); \ | |
19 | __uh = __ll_highpart(u); \ | |
20 | __vl = __ll_lowpart(v); \ | |
21 | __vh = __ll_highpart(v); \ | |
22 | \ | |
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23 | __x0 = (unsigned long) __ul * __vl; \ |
24 | __x1 = (unsigned long) __ul * __vh; \ | |
25 | __x2 = (unsigned long) __uh * __vl; \ | |
26 | __x3 = (unsigned long) __uh * __vh; \ | |
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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 | ||
a671de08 | 46 | long long __muldi3(long long u, long long v) |
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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 | ||
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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); | |
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54 | |
55 | return w.ll; | |
56 | } | |
d50c3036 | 57 | EXPORT_SYMBOL(__muldi3); |