Function superlu_sys::sp_dgemv

pub unsafe extern "C" fn sp_dgemv(
    trans: *mut c_char, 
    alpha: c_double, 
    A: *mut SuperMatrix, 
    x: *mut c_double, 
    incx: c_int, 
    beta: c_double, 
    y: *mut c_double, 
    incy: c_int
) -> c_int