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3feb647f3f
Add a do_div() wrapper, lldiv(). The new inline function doesn't modify the dividend and returns the result of division, so it is useful in complex expressions, i.e. "return(a/b)" -> "return(lldiv(a,b))" Signed-off-by: Sergei Poselenov <sposelenov@emcraft.com>
50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
#ifndef _ASM_GENERIC_DIV64_H
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#define _ASM_GENERIC_DIV64_H
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/*
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* Copyright (C) 2003 Bernardo Innocenti <bernie@develer.com>
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* Based on former asm-ppc/div64.h and asm-m68knommu/div64.h
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*
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* The semantics of do_div() are:
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*
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* uint32_t do_div(uint64_t *n, uint32_t base)
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* {
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* uint32_t remainder = *n % base;
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* *n = *n / base;
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* return remainder;
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* }
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*
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* NOTE: macro parameter n is evaluated multiple times,
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* beware of side effects!
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*/
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#include <linux/types.h>
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extern uint32_t __div64_32(uint64_t *dividend, uint32_t divisor);
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/* The unnecessary pointer compare is there
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* to check for type safety (n must be 64bit)
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*/
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# define do_div(n,base) ({ \
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uint32_t __base = (base); \
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uint32_t __rem; \
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(void)(((typeof((n)) *)0) == ((uint64_t *)0)); \
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if (((n) >> 32) == 0) { \
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__rem = (uint32_t)(n) % __base; \
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(n) = (uint32_t)(n) / __base; \
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} else \
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__rem = __div64_32(&(n), __base); \
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__rem; \
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})
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/* Wrapper for do_div(). Doesn't modify dividend and returns
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* the result, not reminder.
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*/
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static inline uint64_t lldiv(uint64_t dividend, uint32_t divisor)
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{
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uint64_t __res = dividend;
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do_div(__res, divisor);
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return(__res);
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}
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#endif /* _ASM_GENERIC_DIV64_H */
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