pub unsafe extern "C" fn fftwf_plan_guru_split_dft_c2r(
rank: c_int,
dims: *const fftwf_iodim,
howmany_rank: c_int,
howmany_dims: *const fftwf_iodim,
ri: *mut f32,
ii: *mut f32,
out: *mut f32,
flags: c_uint,
) -> fftwf_plan