Multiply by power of two. This function is exact to rounding for all rounding modes. See also:** Documentation for [std::ldexp](https://en.cppreference.com/w/cpp/numeric/math/ldexp). \param arg number to modify \param exp power of two to multiply with \return \a arg multplied by 2 raised to \a exp \exception FE_INVALID for signaling NaN \exception FE_OVERFLOW, ...UNDERFLOW, ...INEXACT according t
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