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spa: utils: Add SPA_ROUND_UP_POW2_32 and SPA_ROUND_UP_POW2_64 macros

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Carlos Rafael Giani 2026-05-26 17:01:18 +02:00
parent fa9eb6320a
commit bb90fdf03b
1 changed files with 28 additions and 0 deletions
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28
spa/include/spa/utils/defs.h
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@ -308,6 +308,34 @@ struct spa_fraction {
(uint32_t)(((_val) * (num) + (_denom)-1) / (_denom)); \ (uint32_t)(((_val) * (num) + (_denom)-1) / (_denom)); \
}) })
/* Macros for getting the next highest power of two, for 32 and 64 bit
* unsigned integers. If the integers are already a power of two, the
* result is unchanged. Source:
* https://graphics.stanford.edu/%7Eseander/bithacks.html#RoundUpPowerOf2 */
#define SPA_ROUND_UP_POW2_32(num) \
({ \
uint32_t _n = (uint32_t)(num) - 1; \
_n |= _n >> 1; \
_n |= _n >> 2; \
_n |= _n >> 4; \
_n |= _n >> 8; \
_n |= _n >> 16; \
_n + 1; \
})
#define SPA_ROUND_UP_POW2_64(num) \
({ \
uint64_t _n = (uint64_t)(num) - 1; \
_n |= _n >> 1; \
_n |= _n >> 2; \
_n |= _n >> 4; \
_n |= _n >> 8; \
_n |= _n >> 16; \
_n |= _n >> 32; \
_n + 1; \
})
#define SPA_PTR_ALIGNMENT(p,align) ((uintptr_t)(p) & ((align)-1)) #define SPA_PTR_ALIGNMENT(p,align) ((uintptr_t)(p) & ((align)-1))
#define SPA_IS_ALIGNED(p,align) (SPA_PTR_ALIGNMENT(p,align) == 0) #define SPA_IS_ALIGNED(p,align) (SPA_PTR_ALIGNMENT(p,align) == 0)