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SubjectRe: [PATCH 1/4] introduce explicit signed/unsigned 64bit divide
On Thu, 13 Mar 2008, zippel@linux-m68k.org wrote:
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/include/linux/math64.h 2008-03-12 21:21:26.000000000 +0100
> @@ -0,0 +1,72 @@
> +#ifndef _LINUX_MATH64_H
> +#define _LINUX_MATH64_H
> +
> +#include <linux/types.h>
> +#include <asm/div64.h>
> +
> +#if BITS_PER_LONG == 64
> +
> +/**
> + * div_u64_rem - unsigned 64bit divide with 32bit divisor with remainder
> + *
> + * This is commonly provided by 32bit archs to provide an optimized 64bit
> + * divide.
> + */
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
> +{
> + *remainder = dividend % divisor;
> + return dividend / divisor;
> +}
> +
> +/**
> + * div_s64_rem - signed 64bit divide with 32bit divisor with remainder
> + */
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
^ ^ ^ ^ ^
s64 div_s64_rem s64 s32 s32
> +{
> + *remainder = dividend % divisor;
> + return dividend / divisor;
> +}
> +
> +#elif BITS_PER_LONG == 32
> +
> +#ifndef div_u64_rem
> +static inline u64 div_u64_rem(u64 dividend, u32 divisor, u32 *remainder)
> +{
> + *remainder = do_div(dividend, divisor);
> + return dividend;
> +}
> +#endif
> +
> +#ifndef div_s64_rem
> +extern s64 div_s64_rem(s64 dividend, s32 divisor, s32 *remainder);
> +#endif

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone: +32 (0)2 700 8453
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E-mail: Geert.Uytterhoeven@sonycom.com
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