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gallium/util: add u_bit_scan_consecutive_range

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Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
This commit is contained in:
Marek Olšák 2015-08-28 20:53:08 +02:00
parent d38a560106
commit fc292b5821
1 changed files with 20 additions and 0 deletions
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20
src/gallium/auxiliary/util/u_math.h
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@ -483,6 +483,26 @@ u_bit_scan64(uint64_t *mask)
}
#endif
/* For looping over a bitmask when you want to loop over consecutive bits
* manually, for example:
*
* while (mask) {
* int start, count, i;
*
* u_bit_scan_consecutive_range(&mask, &start, &count);
*
* for (i = 0; i < count; i++)
* ... process element (start+i)
* }
*/
static inline void
u_bit_scan_consecutive_range(unsigned *mask, int *start, int *count)
{
*start = ffs(*mask) - 1;
*count = ffs(~(*mask >> *start)) - 1;
*mask &= ~(((1 << *count) - 1) << *start);
}
/**
* Return float bits.
*/