Function MaskLowerBits

util/generic/bitops.h:246–248

* Returns 64-bit mask with `bits` lower bits set. */

 * Returns 64-bit mask with `bits` lower bits set.
 */
Y_FORCE_INLINE ui64 MaskLowerBits(ui64 bits) {
    return ::NBitOps::NPrivate::WORD_MASK[bits];
}

/*
 * Return 64-bit mask with `bits` set starting from `skipbits`.