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	2.17	19,684	1582	8.56
C++ g++ #6	3.26	19,712	1535	12.91
C++ g++ #7	13.96	19,712	1156	13.96
C gcc #4	14.21	19,684	1190	14.21
C gcc #5	6.98	19,684	917	27.28
C++ g++ #5	8.00	19,712	987	31.23
C++ g++ #4	9.26	19,688	1445	36.31
C++ g++ #3	36.90	19,688	600	36.90
C++ g++ #2	9.55	19,712	1446	37.53
C gcc #3	39.56	19,684	574	39.56
C gcc	42.31	19,684	514	42.31
C gcc #2	10.85	19,684	1563	42.52
C++ g++	10.87	19,712	1065	42.73
n-body
source	secs	mem	gz	cpu secs
C gcc #9	2.10	19,704	1639	2.10
C++ g++ #0	2.15	19,736	1933	2.15
C++ g++ #7	3.96	19,736	1815	3.96
C++ g++ #2	4.20	19,736	1884	4.20
C gcc #4	4.31	19,684	1496	4.31
C gcc #6	4.97	19,684	1186	4.97
C gcc	5.18	19,684	1179	5.18
C gcc #2	5.20	19,684	1270	5.20
C gcc #3	5.24	19,684	1214	5.24
C++ g++ #3	5.31	19,736	1402	5.31
C gcc #5	5.43	19,684	1436	5.43
C++ g++ #9	5.44	19,736	1536	5.44
C++ g++ #4	5.45	19,736	1434	5.45
C++ g++ #5	6.02	19,736	1544	6.01
C++ g++	6.50	19,736	1666	6.50
C++ g++ #8	6.54	19,736	1524	6.54
C gcc #7	6.82	19,684	1250	6.82
C++ g++ #6	6.91	19,736	1674	6.91
spectral-norm
source	secs	mem	gz	cpu secs
C gcc #6	0.39	19,724	1203	1.54
C++ g++ #6	0.72	19,884	1050	2.85
C gcc #4	0.72	19,724	1145	2.85
C gcc #7	0.72	19,724	906	2.85
C gcc #5	0.72	19,708	576	2.86
C++ g++ #5	1.33	19,788	1050	5.27
C++ g++	5.37	19,852	459	5.37
C gcc	5.39	19,724	390	5.39
C gcc #3	1.43	19,708	470	5.70
C++ g++ #8	1.52	19,820	1284	6.06
C gcc #8		Make Error
mandelbrot
source	secs	mem	gz	cpu secs
C++ g++	0.89	34,944	1797	3.47
C++ g++ #4	0.89	35,328	3554	3.47
C++ g++ #6	0.98	35,072	1014	3.90
C gcc #6	1.29	33,408	1147	5.13
C gcc #5	1.63	33,536	788	6.32
C++ g++ #0	2.36	35,456	2752	9.30
C++ g++ #8	4.84	34,944	749	13.21
C++ g++ #5	13.35	34,560	596	13.35
C++ g++ #9	3.50	35,072	732	13.49
C gcc #4	3.49	33,152	805	13.88
C gcc #7	3.50	33,280	1000	13.91
C gcc	3.50	32,768	828	13.93
C++ g++ #7	3.51	35,072	1023	13.94
C gcc #3	3.53	32,768	769	14.09
C gcc #9	4.23	33,280	700	16.34
C++ g++ #2	16.94	34,560	700	16.94
C gcc #2	25.05	19,684	412	25.04
C++ g++ #3	27.27	19,736	421	27.27
pidigits
source	secs	mem	gz	cpu secs
C gcc #2	0.82	19,704	422	0.82
C++ g++ #5	0.87	19,736	804	0.87
C++ g++ #4	0.89	19,736	521	0.88
C gcc	0.89	19,704	459	0.88
regex-redux
source	secs	mem	gz	cpu secs
C gcc #5	0.81	152,392	1403	2.03
C++ g++ #6	1.18	276,148	2856	2.23
C gcc #2	3.21	103,296	1121	3.21
C gcc #4	0.95	152,248	1237	3.27
C gcc #3	1.73	103,680	1273	3.31
C++ g++	3.56	212,180	662	3.56
C++ g++ #2	2.86	212,648	706	3.62
C++ g++ #5	3.81	215,648	859	4.53
C++ g++ #3	12.46	215,472	859	18.08
C++ g++ #4		Make Error
fasta
source	secs	mem	gz	cpu secs
C gcc #9	0.78	19,440	1469	0.78
C gcc #5	1.24	19,684	1286	1.24
C++ g++ #8	0.78	19,712	2758	1.54
C++ g++ #2	1.80	19,712	1129	1.80
C++ g++	1.90	19,712	1064	1.90
C++ g++ #3	2.62	19,712	1311	2.62
C gcc #6	0.94	19,684	1936	2.77
C gcc #7	2.79	19,440	1299	2.79
C gcc #4	3.03	19,684	1244	3.03
C gcc #2	0.82	19,684	2276	3.25
C++ g++ #4	3.34	19,712	1291	3.34
C++ g++ #5	1.07	19,712	2345	3.67
C gcc	3.74	19,684	1213	3.74
C++ g++ #6	1.07	19,712	2326	3.85
C gcc #8	4.56	19,440	825	4.55
C++ g++ #7		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	2.02	156,512	1634	6.09
C gcc	3.98	130,432	1512	12.93
C++ g++ #3	4.18	165,384	1280	13.93
C++ g++	7.10	757,084	1452	14.78
reverse-complement
source	secs	mem	gz	cpu secs
C gcc #7	0.43	499,928	1899	0.59
C++ g++ #2	0.71	499,712	2099	0.71
C gcc #9	0.49	499,744	1551	0.82
C gcc #6	0.97	696,664	828	1.39
C gcc #5	1.52	994,176	654	1.52
C gcc #2	1.05	994,560	757	1.57
C gcc #4	3.68	500,480	716	3.68
C++ g++ #6	3.26	1,517,580	1827	4.32
C++ g++	6.50	979,912	599	6.50
C++ g++ #5	36.24	771,432	704	36.24
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.96	201,536	896	3.35
C++ g++ #5	1.15	200,660	891	4.08
C gcc #2	1.57	169,216	816	4.48
C++ g++ #9	1.65	136,064	815	4.55
C gcc #3	1.92	134,400	842	4.70
C++ g++ #6	1.92	266,112	851	4.74
C++ g++ #3	2.25	265,600	951	5.11
C++ g++ #8	2.22	266,112	826	5.26
C++ g++	2.68	2,068,612	760	9.34
C gcc	21.32	264,064	660	21.32
C++ g++ #2	21.96	265,856	514	21.96
C gcc #5	8.66	351,232	914	31.56
C++ g++ #4		Make Error
C++ g++	Ubuntu 13.2.0-23ubuntu4
C gcc	13.2.0-23ubuntu4