Function ddiv_rz 

pub unsafe extern "C" fn ddiv_rz(x: f64, y: f64) -> f64

Divides two floating point values by in round-towards-zero modex. y

Nvidia docs

Returns

Returns / x. y For accuracy information for this function see the CUDA C Programming Guide, Appendix D.1, Table 7. Requires compute capability >= 2.0.