Function rte_log2_u64

dpdk/lib/eal/include/rte_bitops.h:712–720

* Return the rounded-up log2 of a 64-bit integer. * * @note Contrary to the logarithm mathematical operation, * rte_log2_u64(0) == 0 and not -inf. * * @param v * The input parameter. * @return * The rounded-up log2 of the input, or 0 if the input is 0. */

 *     The rounded-up log2 of the input, or 0 if the input is 0.
 */
static inline uint32_t
rte_log2_u64(uint64_t v)
{
	if (v == 0)
		return 0;
	v = rte_align64pow2(v);
	/* we checked for v being 0 already, so no undefined behavior */
	return rte_bsf64(v);
}

#ifdef __cplusplus
}