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📄 div64.h

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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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