Function frexp

include/half.hpp:4128–4137

Decompress floating-point number. See also:** Documentation for [std::frexp](https://en.cppreference.com/w/cpp/numeric/math/frexp). \param arg number to decompress \param exp address to store exponent at \return significant in range [0.5, 1) \exception FE_INVALID for signaling NaN

	/// \return significant in range [0.5, 1)
	/// \exception FE_INVALID for signaling NaN
	inline half frexp(half arg, int *exp)
	{
		*exp = 0;
		unsigned int abs = arg.data_ & 0x7FFF;
		if(abs >= 0x7C00 || !abs)
			return (abs>0x7C00) ? half(detail::binary, detail::signal(arg.data_)) : arg;
		for(; abs<0x400; abs<<=1,--*exp) ;
		*exp += (abs>>10) - 14;
		return half(detail::binary, (arg.data_&0x8000)|0x3800|(abs&0x3FF));
	}

	/// Multiply by power of two.
	/// This function is exact to rounding for all rounding modes.