Function bitops_clz64

ccan/ccan/bitops/bitops.h:64–71

* bitops_clz64: count leading zeros in a uint64_t (must not be 0) * * Returns 0 if most significant bit is set, 63 if only least * significant bit is set. */

 * significant bit is set.
 */
static inline int bitops_clz64(uint64_t u)
{
	BITOPS_ASSERT_NONZERO(u);
	if (sizeof(u) == sizeof(long))
		return __builtin_clzl(u);
	else
		return __builtin_clzll(u);
}
#else
int bitops_clz32(uint32_t u);
int bitops_clz64(uint64_t u);