C++ g++ versus C gcc fastest performance

How the programs are written matters! Always look at the source code.

If the fastest programs are hand-written vector instructions, does the host language matter? You might be more interested in the less optimised programs — more seconds, less gz source code.

fannkuch-redux
source	secs	mem	gz	cpu secs
* C gcc #6	2.14	19,704	1582	8.43
* C++ g++ #6	3.31	19,760	1535	13.11
* C++ g++ #7	14.03	19,760	1156	14.03
* C gcc #4	14.04	19,704	1190	14.03
C gcc #5	7.29	19,704	917	28.25
C++ g++ #5	7.85	19,760	987	30.68
C++ g++ #4	8.92	19,760	1445	35.00
C++ g++ #2	9.13	19,760	1446	35.73
C gcc #3	36.80	19,704	574	36.79
C++ g++ #3	37.88	19,760	600	37.87
C gcc #8	39.33	19,492	483	39.32
C gcc	39.61	19,704	514	39.60
* C gcc #2	10.19	19,704	1563	39.99
C++ g++	10.49	19,760	1065	41.21
n-body
source	secs	mem	gz	cpu secs
* C gcc #9	2.10	19,772	1639	2.10
* C++ g++ #0	2.15	19,760	1933	2.15
* C gcc #4	4.05	19,772	1398	4.05
* C++ g++ #7	4.11	19,760	1815	4.11
C gcc #6	4.97	19,772	1186	4.97
C++ g++ #9	5.14	19,760	1536	5.14
C gcc #2	5.19	19,772	1270	5.19
C gcc #3	5.23	19,772	1214	5.23
C gcc	5.23	19,772	1179	5.23
C++ g++ #3	5.32	19,760	1402	5.32
* C gcc #5	5.43	19,772	1436	5.43
* C++ g++ #4	5.45	19,760	1434	5.45
C gcc #8	5.54	19,492	1193	5.54
* C++ g++ #2	6.02	19,352	1524	6.01
C++ g++ #5	6.32	19,760	1544	6.32
C++ g++	6.61	19,760	1666	6.61
C gcc #7	6.89	19,772	1250	6.88
C++ g++ #6	6.93	19,760	1674	6.93
spectral-norm
source	secs	mem	gz	cpu secs
* C gcc #6	0.40	19,772	1203	1.59
* C gcc #5	0.72	19,772	576	2.85
* C gcc #7	0.72	19,772	906	2.85
* C gcc #4	0.72	19,772	1145	2.85
* C++ g++ #6	0.73	19,760	1050	2.86
* C++ g++ #5	1.33	19,760	1050	5.28
C++ g++	5.33	19,760	459	5.33
C gcc #8	5.40	19,772	389	5.39
C gcc #3	1.43	19,772	470	5.70
C++ g++ #7	1.52	19,512	1284	6.04
* C gcc #2		Make Error
mandelbrot
source	secs	mem	gz	cpu secs
* C++ g++ #4	0.89	35,344	3554	3.45
* C++ g++	0.89	34,952	1797	3.47
* C++ g++ #6	0.98	35,080	1014	3.87
* C gcc #6	1.28	33,400	1147	5.10
C gcc #5	1.63	33,512	788	6.31
C++ g++ #0	2.35	35,476	2752	9.30
* C++ g++ #7	4.86	35,176	749	13.28
C++ g++ #5	13.44	34,636	596	13.43
C++ g++ #9	3.52	35,120	732	13.55
* C gcc #4	3.52	33,060	805	13.89
* C gcc	3.49	32,864	828	13.92
* C gcc #7	3.51	33,276	1000	13.95
* C gcc #3	3.53	32,860	769	14.09
C gcc #9	4.07	33,128	700	15.70
C++ g++ #2	16.95	34,636	700	16.94
C gcc #8	25.15	19,496	412	25.15
C++ g++ #3	27.37	19,760	421	27.36
fasta
source	secs	mem	gz	cpu secs
C gcc #9	0.78	19,772	1469	0.78
C gcc #5	1.24	19,772	1286	1.24
C++ g++ #9	0.78	19,352	2758	1.54
C++ g++ #2	1.84	19,760	1129	1.84
C++ g++	1.92	19,760	1064	1.92
C++ g++ #3	2.63	19,760	1311	2.63
C gcc #7	2.76	19,772	1299	2.76
C gcc #6	0.94	19,772	1936	2.78
C++ g++ #7	0.87	19,760	2711	3.05
C gcc #2	0.82	19,772	2276	3.24
C++ g++ #4	3.32	19,760	1291	3.32
C++ g++ #5	1.06	19,760	2345	3.66
C gcc	3.70	19,772	1213	3.70
C++ g++ #6	1.07	19,760	2326	4.01
C gcc #8	4.62	19,772	825	4.62
C gcc #4		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	2.01	156,592	1634	5.98
C gcc	3.84	130,408	1512	12.45
C++ g++ #3	4.19	165,580	1280	13.94
C++ g++	6.96	757,156	1452	14.75
reverse-complement
source	secs	mem	gz	cpu secs
* C gcc #7	0.44	499,992	1899	0.59
* C++ g++ #2	0.74	499,916	2099	0.74
C gcc #9	0.48	500,032	1551	0.76
C gcc #6	0.96	675,260	828	1.36
C gcc #5	1.53	994,108	654	1.53
C gcc #2	1.06	994,536	757	1.58
* C gcc #4	3.70	500,452	716	3.69
C++ g++ #6	3.30	1,517,824	1827	4.38
C++ g++	6.52	980,156	599	6.51
C++ g++ #5	37.59	771,632	704	37.58
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.97	201,512	896	3.40
C++ g++ #5	1.16	200,724	891	4.10
C gcc #2	1.53	169,284	816	4.18
C++ g++ #9	1.74	136,120	815	4.63
C gcc #3	1.96	134,540	842	4.70
C++ g++ #3	1.91	265,636	951	4.74
C++ g++ #6	1.91	266,120	851	4.77
C++ g++ #4	2.22	266,136	826	5.20
C++ g++	2.65	2,153,044	760	9.23
C gcc #8	21.08	285,544	607	21.08
C gcc	21.67	264,244	660	21.67
C++ g++ #2	22.83	265,840	514	22.82
C gcc #5	8.77	351,332	914	31.93
pidigits
source	secs	mem	gz	cpu secs
C++ g++ #4	0.71	19,760	521	0.71
* C++ g++ #5	0.73	19,760	804	0.73
C gcc #2	0.74	19,772	422	0.74
C gcc	0.74	19,772	459	0.74
regex-redux
source	secs	mem	gz	cpu secs
C gcc #5	0.81	152,500	1403	2.03
C++ g++ #6	1.15	276,336	2856	2.24
C gcc #2	3.21	103,288	1121	3.21
C gcc #4	0.97	152,264	1237	3.28
C gcc #3	1.72	103,736	1273	3.31
C++ g++ #3	12.38	215,640	859	17.95
C++ g++		Make Error
C++ g++ #2		Make Error
C++ g++ #5		Make Error
C++ g++ #4		Make Error
C++ g++	g++ (Ubuntu 14.2.0-4ubuntu2) 14.2.0
C gcc	gcc (Ubuntu 14.2.0-4ubuntu2) 14.2.0