42 _LIBCPP_NODISCARD _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX14 int __countr_zero(_Tp __t) _N…  in __countr_zero()  argument
44   return __builtin_ctzg(__t, numeric_limits<_Tp>::digits);  in __countr_zero()
46   if (__t == 0)  in __countr_zero()
49     return std::__libcpp_ctz(static_cast<unsigned int>(__t));  in __countr_zero()
51     return std::__libcpp_ctz(static_cast<unsigned long>(__t));  in __countr_zero()
53     return std::__libcpp_ctz(static_cast<unsigned long long>(__t));  in __countr_zero()
57     while (static_cast<unsigned long long>(__t) == 0uLL) {  in __countr_zero()
59       __t >>= __ulldigits;  in __countr_zero()
61     return __ret + std::__libcpp_ctz(static_cast<unsigned long long>(__t));  in __countr_zero()
69 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr int countr_zero(_Tp __t) noexcept {  in countr_zero()  argument
70   return std::__countr_zero(__t);  in countr_zero()
74 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr int countr_one(_Tp __t) noexcept {  in countr_one()  argument
75 …return __t != numeric_limits<_Tp>::max() ? std::countr_zero(static_cast<_Tp>(~__t)) : numeric_limi…  in countr_one()