BITS_PER_BYTE     315 ext/mbstring/oniguruma/regint.h #define SINGLE_BYTE_SIZE   (1 << BITS_PER_BYTE)
BITS_PER_BYTE     316 ext/mbstring/oniguruma/regint.h #define BITS_IN_ROOM       (sizeof(Bits) * BITS_PER_BYTE)