Free Pascal versus C++ g++ fastest performance

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++ g++ #6	3.25	19,788	1535	12.89
C++ g++ #7	13.93	19,660	1156	13.93
C++ g++ #5	7.97	19,788	987	31.14
C++ g++ #3	36.80	19,660	600	36.80
C++ g++ #4	9.47	19,660	1445	37.11
C++ g++ #2	9.82	19,656	1446	38.58
C++ g++	10.59	19,660	1065	41.61
Free Pascal	10.58	19,664	1032	42.13
n-body
source	secs	mem	gz	cpu secs
C++ g++ #0	2.14	19,676	1933	2.14
C++ g++ #7	3.97	19,804	1815	3.97
C++ g++ #2	4.20	19,676	1884	4.19
C++ g++ #3	5.30	19,804	1402	5.30
C++ g++ #9	5.43	19,676	1536	5.43
C++ g++ #4	5.44	19,804	1434	5.44
C++ g++ #5	6.01	19,676	1544	6.00
Free Pascal	6.28	19,680	1315	6.28
Free Pascal #2	6.28	19,680	1328	6.28
C++ g++	6.49	19,676	1666	6.49
C++ g++ #8	6.57	19,676	1524	6.57
C++ g++ #6	6.89	19,676	1674	6.89
Free Pascal #3	7.16	19,680	1424	7.16
spectral-norm
source	secs	mem	gz	cpu secs
C++ g++ #6	0.72	19,812	1050	2.84
C++ g++ #5	1.32	19,684	1050	5.25
C++ g++	5.36	19,684	459	5.36
Free Pascal #3	1.44	19,824	632	5.70
Free Pascal #2	1.45	19,696	548	5.71
C++ g++ #8	1.52	19,684	1284	6.04
Free Pascal	11.77	19,696	429	11.77
mandelbrot
source	secs	mem	gz	cpu secs
C++ g++	0.89	34,944	1797	3.46
C++ g++ #4	0.89	35,200	3554	3.47
C++ g++ #6	0.98	35,072	1014	3.89
C++ g++ #0	2.35	35,328	2752	9.28
C++ g++ #8	4.79	35,072	749	13.12
C++ g++ #5	13.33	34,688	596	13.33
C++ g++ #9	3.50	35,200	732	13.49
C++ g++ #7	3.49	35,072	1023	13.90
Free Pascal #8	3.90	33,024	958	15.47
C++ g++ #2	16.90	34,560	700	16.90
Free Pascal #7	6.55	36,992	930	26.05
Free Pascal #3	26.52	19,680	533	26.52
C++ g++ #3	27.26	19,804	421	27.25
Free Pascal #2	10.96	33,024	833	29.39
Free Pascal	10.98	33,024	833	29.41
Free Pascal #6	7.45	36,096	788	29.64
pidigits
source	secs	mem	gz	cpu secs
C++ g++ #5	0.86	19,804	804	0.86
Free Pascal #3	0.87	19,824	493	0.87
C++ g++ #4	0.88	19,804	521	0.88
Free Pascal #2	5.36	19,696	802	5.36
Free Pascal	14.63	19,696	3054	14.63
regex-redux
source	secs	mem	gz	cpu secs
C++ g++ #6	1.15	276,276	2856	2.18
C++ g++ #2	2.84	212,776	706	3.60
C++ g++	3.62	212,180	662	3.62
C++ g++ #5	3.86	215,556	859	4.54
Free Pascal	5.51	103,016	1300	5.51
C++ g++ #3	12.41	217,580	859	17.91
C++ g++ #4		Make Error
fasta
source	secs	mem	gz	cpu secs
C++ g++ #8	0.76	19,792	2758	1.51
C++ g++ #2	1.81	19,668	1129	1.81
C++ g++	1.90	19,664	1064	1.90
C++ g++ #3	2.62	19,664	1311	2.62
C++ g++ #4	3.32	19,664	1291	3.32
C++ g++ #6	1.05	19,668	2326	3.85
C++ g++ #5	1.05	19,668	2345	3.88
Free Pascal #6	5.58	19,676	1196	5.58
Free Pascal #5	5.64	19,792	1225	5.64
C++ g++ #7		Make Error
k-nucleotide
source	secs	mem	gz	cpu secs
C++ g++ #2	1.97	156,504	1634	5.87
C++ g++ #3	4.19	165,592	1280	13.77
C++ g++	6.90	757,080	1452	14.68
reverse-complement
source	secs	mem	gz	cpu secs
C++ g++ #2	0.70	499,840	2099	0.70
Free Pascal #2	3.77	525,048	773	3.77
C++ g++ #6	3.20	1,517,660	1827	4.22
C++ g++	6.56	980,060	599	6.56
C++ g++ #5	35.10	771,556	704	35.10
C++ g++ #3		Bad Output
binary-trees
source	secs	mem	gz	cpu secs
C++ g++ #7	0.95	201,400	896	3.30
C++ g++ #5	1.14	200,660	891	3.98
C++ g++ #9	1.72	135,936	815	4.46
C++ g++ #6	1.88	266,112	851	4.47
C++ g++ #3	1.88	265,600	951	4.72
Free Pascal #5	2.09	132,608	929	4.98
Free Pascal #6	2.09	132,608	939	4.99
Free Pascal #7	2.12	132,608	975	5.07
C++ g++ #8	2.18	265,984	826	5.11
C++ g++	2.65	2,040,792	760	9.07
C++ g++ #2	21.51	265,856	514	21.51
C++ g++ #4		Make Error
Free Pascal	Free Pascal Compiler version 3.2.2 [2021/05/16]
C++ g++	Ubuntu 13.2.0-4ubuntu3