R2R变换
kml_fft(f)_plan_r2r
kml_fft(f)_plan_r2r_1d
kml_fft(f)_plan_r2r_2d
kml_fft(f)_plan_r2r_3d
kml_fft(f)_plan_guru_r2r
kml_fft(f)_plan_guru64_r2r
kml_fft(f)_plan_many_r2r
父主题：
函数定义