Function frexp 

pub unsafe extern "C" fn frexp(x: f64, b: *mut i32) -> f64

Decompose the floating-point value into a component for the normalized fractionx m element and another term for the exponent. The absolute value of will be greater n m than or equal to 0.5 and less than 1.0 or it will be equal to 0; . The integer exponent will be stored in the location to which points. n nptr

Nvidia docs

Returns

Returns the fractional component . m

• __nv_frexp(0, nptr) returns 0 for the fractional component and zero for the integer component.
• __nv_frexp( , nptr) returns and stores zero in the location pointed to by . nptr
• __nv_frexp( , nptr) returns and stores an unspecified value in the location to which points. nptr
• __nv_frexp(NaN, y) returns a NaN and stores an unspecified value in the location to which points. nptr For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 7.