Classic Fortran versus Intel Fortran 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
Intel Fortran #3	9.58	19,856	1164	38.22
Classic Fortran	38.73	19,724	608	38.73
Classic Fortran #3	10.14	19,724	1164	40.45
Intel Fortran	41.03	19,724	608	41.02
n-body
source	secs	mem	gz	cpu secs
Intel Fortran #5	3.42	19,728	1669	3.41
Classic Fortran #6	4.21	19,856	1530	4.21
Intel Fortran #6	4.26	19,728	1530	4.26
Intel Fortran #2	4.40	19,728	1507	4.40
Intel Fortran #3	4.42	19,728	1311	4.41
Intel Fortran	4.53	19,728	1400	4.53
Classic Fortran #2	5.37	19,856	1507	5.37
Classic Fortran	5.43	19,728	1400	5.43
Classic Fortran #5	5.98	19,728	1669	5.98
Classic Fortran #4	6.18	19,728	1183	6.18
Classic Fortran #3	6.32	19,856	1311	6.32
Intel Fortran #4		Bad Output
spectral-norm
source	secs	mem	gz	cpu secs
Intel Fortran #2	2.66	19,736	520	2.66
Classic Fortran #2	2.66	19,736	520	2.66
Classic Fortran #3	0.72	19,736	644	2.87
Intel Fortran #3	0.73	19,736	644	2.88
mandelbrot
source	secs	mem	gz	cpu secs
Classic Fortran #8	1.42	75,392	965	5.59
Intel Fortran #6	2.81	76,288	669	8.96
Classic Fortran #6	3.27	75,904	669	10.86
Intel Fortran #8	4.06	75,904	965	16.12
Intel Fortran #4	9.79	76,416	626	25.24
Classic Fortran #4	10.27	75,904	626	26.58
Intel Fortran #5	32.52	43,904	528	32.52
Classic Fortran #5	45.21	43,648	528	45.21
pidigits
source	secs	mem	gz	cpu secs
Intel Fortran #4	0.87	19,856	987	0.87
Classic Fortran #4	0.87	19,728	987	0.87
regex-redux
source	secs	mem	gz	cpu secs
Classic Fortran	0.93	176,236	2229	3.04
Intel Fortran	0.95	176,564	2229	3.08
fasta
source	secs	mem	gz	cpu secs
Intel Fortran #4	1.30	19,728	1355	1.30
Classic Fortran #4	2.05	19,728	1355	2.05
Intel Fortran	5.76	19,728	1193	5.76
Intel Fortran #3	6.34	19,728	1217	6.34
Classic Fortran #3	6.55	19,728	1217	6.55
Classic Fortran	6.85	19,728	1193	6.85
k-nucleotide
source	secs	mem	gz	cpu secs
Classic Fortran		Make Error
Intel Fortran		Make Error
reverse-complement
source	secs	mem	gz	cpu secs
Intel Fortran	3.32	986,304	1026	3.32
Classic Fortran	4.15	986,304	1026	4.14
Classic Fortran #2	41.23	769,748	778	41.23
Intel Fortran #2	44.96	769,748	778	44.95
binary-trees
source	secs	mem	gz	cpu secs
Intel Fortran #2	2.13	136,576	1155	6.55
Classic Fortran #2	2.26	136,704	1155	6.87
Classic Fortran	31.48	525,824	780	31.48
Intel Fortran	31.50	525,824	780	31.50
Classic Fortran	Fortran Compiler Classic 2021.11.1 20231117
Intel Fortran	ifx (IFX) 2024.0.2 20231213