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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [include/] [asm-parisc/] [div64.h] - Rev 1774
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#ifndef __ASM_PARISC_DIV64 #define __ASM_PARISC_DIV64 #ifdef __LP64__ /* * Copyright (C) 1999 Hewlett-Packard Co * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com> * * vsprintf uses this to divide a 64-bit integer N by a small integer BASE. * This is incredibly hard on IA-64 and HPPA */ #define do_div(n,base) \ ({ \ int _res; \ _res = ((unsigned long) (n)) % (unsigned) (base); \ (n) = ((unsigned long) (n)) / (unsigned) (base); \ _res; \ }) #else /* * unsigned long long division. Yuck Yuck! What is Linux coming to? * This is 100% disgusting */ #define do_div(n,base) \ ({ \ unsigned long __low, __low2, __high, __rem; \ __low = (n) & 0xffffffff; \ __high = (n) >> 32; \ if (__high) { \ __rem = __high % (unsigned long)base; \ __high = __high / (unsigned long)base; \ __low2 = __low >> 16; \ __low2 += __rem << 16; \ __rem = __low2 % (unsigned long)base; \ __low2 = __low2 / (unsigned long)base; \ __low = __low & 0xffff; \ __low += __rem << 16; \ __rem = __low % (unsigned long)base; \ __low = __low / (unsigned long)base; \ n = __low + ((long long)__low2 << 16) + \ ((long long) __high << 32); \ } else { \ __rem = __low % (unsigned long)base; \ n = (__low / (unsigned long)base); \ } \ __rem; \ }) #endif #endif
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