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static inline count_t fnzb(u32_t arg)

{

  count_t n;

  asm volatile ("xor %0, %0 \n\t"

                "bsr %0, %1"

                :"=&r" (n)

                :"r"(arg)

                );

	return n;

}

static inline count_t _bsf(u32_t arg)

{

  count_t n;

  asm volatile ("xor %0, %0 \n\t"

                "bsf %0, %1"

                :"=&r" (n)

                :"r"(arg)

                );

	return n;

}

static inline void _bts(u32_t *data, count_t val)

{

  asm volatile ("bts %0, %1 \n\t"

                :

                :"g"(data), "r"(val)

                :"cc"

                );

}

static inline void _btr(u32_t *data, count_t val)

{

  asm volatile ("btr %0, %1 \n\t"

                :

                :"g"(data), "r"(val)

                :"cc"

                );

}