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1da177e4 LT |
1 | #ifndef _ASM_M32R_DIV64 |
2 | #define _ASM_M32R_DIV64 | |
3 | ||
4 | /* $Id$ */ | |
5 | ||
6 | /* unsigned long long division. | |
7 | * Input: | |
8 | * unsigned long long n | |
9 | * unsigned long base | |
10 | * Output: | |
11 | * n = n / base; | |
12 | * return value = n % base; | |
13 | */ | |
14 | #define do_div(n, base) \ | |
15 | ({ \ | |
16 | unsigned long _res, _high, _mid, _low; \ | |
17 | \ | |
18 | _low = (n) & 0xffffffffUL; \ | |
19 | _high = (n) >> 32; \ | |
20 | if (_high) { \ | |
21 | _mid = (_high % (unsigned long)(base)) << 16; \ | |
22 | _high = _high / (unsigned long)(base); \ | |
23 | _mid += _low >> 16; \ | |
24 | _low &= 0x0000ffffUL; \ | |
25 | _low += (_mid % (unsigned long)(base)) << 16; \ | |
26 | _mid = _mid / (unsigned long)(base); \ | |
27 | _res = _low % (unsigned long)(base); \ | |
28 | _low = _low / (unsigned long)(base); \ | |
29 | n = _low + ((long long)_mid << 16) + \ | |
30 | ((long long)_high << 32); \ | |
31 | } else { \ | |
32 | _res = _low % (unsigned long)(base); \ | |
33 | n = (_low / (unsigned long)(base)); \ | |
34 | } \ | |
35 | _res; \ | |
36 | }) | |
37 | ||
38 | #endif /* _ASM_M32R_DIV64 */ |