| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 */ |