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sys: div: add div/mod 44488 (needed for minstd prng)

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This commit is contained in:
Kaspar Schleiser 2015-10-12 16:04:38 +02:00
parent 3e7753bff4
commit fab1681735
1 changed files with 22 additions and 0 deletions
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22
sys/include/div.h
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@ -77,6 +77,28 @@ static inline uint32_t div_u32_by_15625div512(uint32_t val)
return ((uint64_t)(val) * 0x431bde83ul) >> (12 + 32 - 9);
}
/**
* @brief Integer divide val by 44488
*
* @param[in] val dividend
* @return (val / 44488)
*/
static inline uint32_t div_u32_by_44488(uint32_t val)
{
return ((uint64_t)val * 0xBC8F1391UL) >> (15 + 32);
}
/**
* @brief Modulo 44488
*
* @param[in] val dividend
* @return (val % 44488)
*/
static inline uint32_t div_u32_mod_44488(uint32_t val)
{
return val - (div_u32_by_44488(val)*44488);
}
#ifdef __cplusplus
}
#endif