fft: complex-data, 2D transforms
	genial float	fftw estimate float	fftw measure float	genial double	fftw estimate double	fftw measure double
(4x4)	404	1251	1272	334	1128	1015	
(8x8)	1302	2906	2881	953	2101	2099	
(8x16)	1923	3403	3411	1267	2403	2406	
(16x16)	2403	3935	3928	1489	2602	2583	
(16x32)	2816	3983	3968	1671	2559	2531	
(32x32)	2979	4028	3996	1728	2473	2465	
(32x64)	3143	4128	4088	1735	2469	2443	
(64x64)	3073	4252	4231	1561	2134	2197	
(64x128)	2944	3243	3653	1577	1207	1562	
(128x128)	2836	1621	2191	1350	552	1318	
(128x256)	2676	1448	2087	1187	401	1042	
(256x256)	2317	1117	1835	535	241	918	
(256x512)	1103	758	1649	568	263	914	
(512x512)	1156	744	1675	581	244	944	
(1024x1024)	1265	826	1729	643	258	889