<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
,	O
as	O
part	O
of	O
Intel	O
OneAPI	B-Operating_System
HPC	O
toolkit	O
,	O
is	O
a	O
group	O
of	O
Fortran	B-Application
compilers	B-Language
from	O
Intel	O
for	O
Windows	B-Application
,	O
macOS	B-Application
,	O
and	O
Linux	B-Application
.	O
</s>
<s>
The	O
compilers	B-Language
generate	O
code	O
for	O
IA-32	B-Device
and	O
Intel	O
64	O
processors	O
and	O
certain	O
non-Intel	O
but	O
compatible	O
processors	O
,	O
such	O
as	O
certain	O
AMD	O
processors	O
.	O
</s>
<s>
A	O
specific	O
release	O
of	O
the	O
compiler	B-Language
(	O
11.1	O
)	O
remains	O
available	O
for	O
development	O
of	O
Linux-based	O
applications	O
for	O
IA-64	O
(	O
Itanium	B-General_Concept
2	I-General_Concept
)	O
processors	O
.	O
</s>
<s>
On	O
Windows	B-Application
,	O
it	O
is	O
known	O
as	O
Intel	O
Visual	B-Application
Fortran	I-Application
.	O
</s>
<s>
On	O
macOS	B-Application
and	O
Linux	B-Application
,	O
it	O
is	O
known	O
as	O
Intel	B-Language
Fortran	I-Language
.	O
</s>
<s>
In	O
2020	O
the	O
existing	O
compiler	B-Language
was	O
renamed	O
“	O
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
Classic	O
”	O
(	O
ifort	B-Language
)	O
and	O
a	O
new	O
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
for	O
oneAPI	B-Operating_System
(	O
ifx	O
)	O
supporting	O
GPU	O
offload	O
was	O
introduced	O
.	O
</s>
<s>
The	O
2021	O
release	O
of	O
the	O
Classic	O
compiler	B-Language
adds	O
full	O
Fortran	B-Application
support	O
through	O
the	O
2018	O
standard	O
,	O
full	O
OpenMP*	O
4.5	O
,	O
and	O
Initial	O
Open	O
MP	O
5.1	O
for	O
CPU	O
only	O
.	O
</s>
<s>
The	O
2021	O
beta	O
compiler	B-Language
focuses	O
on	O
OpenMP	O
for	O
GPU	O
Offload	O
.	O
</s>
<s>
When	O
used	O
with	O
the	O
Intel	O
OneAPI	B-Operating_System
HPC	O
toolkit	O
(	O
see	O
the	O
"	O
Description	O
of	O
Packaging	O
"	O
below	O
)	O
the	O
compiler	B-Language
can	O
also	O
automatically	O
generate	O
Message	B-Application
Passing	I-Application
Interface	I-Application
calls	O
for	O
distributed	B-Operating_System
memory	I-Operating_System
multiprocessing	I-Operating_System
from	O
OpenMP	O
directives	O
.	O
</s>
<s>
For	O
more	O
information	O
on	O
Fortran	B-Application
standards	O
,	O
a	O
number	O
or	O
resources	O
are	O
available	O
,	O
such	O
as	O
the	O
Wikipedia	O
Fortran	B-Application
entry	O
or	O
the	O
wiki	O
page	O
.	O
</s>
<s>
Intel	O
compilers	B-Language
are	O
optimized	O
for	O
computer	O
systems	O
using	O
processors	O
that	O
support	O
Intel	O
architectures	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compilers	I-Language
support	O
three	O
separate	O
high-level	O
techniques	O
for	O
optimizing	O
the	O
compiled	B-Language
program	O
:	O
interprocedural	O
optimization	O
(	O
IPO	O
)	O
,	O
profile-guided	O
optimization	O
(	O
PGO	O
)	O
,	O
and	O
other	O
high-level	O
optimizations	O
(	O
HLO	O
)	O
.	O
</s>
<s>
Interprocedural	O
optimization	O
applies	O
typical	O
compiler	B-Language
optimizations	O
(	O
such	O
as	O
constant	O
propagation	O
)	O
but	O
uses	O
a	O
broader	O
scope	O
that	O
may	O
include	O
multiple	O
procedures	O
,	O
multiple	O
files	O
,	O
or	O
the	O
entire	O
program	O
.	O
</s>
<s>
Regarding	O
profile-guided	O
optimization	O
,	O
the	O
compiler	B-Language
generates	O
a	O
dataset	O
of	O
performance-related	O
information	O
from	O
using	O
the	O
application	O
with	O
representative	O
workloads	O
,	O
which	O
it	O
then	O
analyzes	O
to	O
find	O
which	O
parts	O
of	O
the	O
application	O
are	O
executed	O
more	O
and	O
less	O
frequently	O
.	O
</s>
<s>
The	O
compiler	B-Language
uses	O
these	O
data	O
to	O
organize	O
application	O
execution	O
to	O
optimize	O
performance	O
based	O
on	O
how	O
the	O
application	O
is	O
actually	O
used	O
.	O
</s>
<s>
Thus	O
,	O
all	O
optimizations	O
can	O
benefit	O
from	O
profile-guided	O
feedback	O
because	O
they	O
are	O
less	O
reliant	O
on	O
heuristics	O
when	O
making	O
compilation	B-Language
decisions	O
.	O
</s>
<s>
This	O
includes	O
loop	O
interchange	O
,	O
loop	O
fusion	O
,	O
loop	B-Operating_System
unrolling	I-Operating_System
,	O
loop	O
distribution	O
,	O
data	O
prefetch	O
,	O
and	O
more	O
.	O
</s>
<s>
The	O
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
Classic	O
fully	O
supports	O
Fortran	B-Application
through	O
the	O
2018	O
standard	O
.	O
</s>
<s>
The	O
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
(	O
Beta	O
)	O
supports	O
full	O
Fortran	B-Application
77/90/95	O
and	O
has	O
partial	O
support	O
of	O
the	O
Fortran	B-Application
2003	O
standard	O
.	O
</s>
<s>
The	O
compilers	B-Language
are	O
available	O
standalone	O
from	O
Intel	O
and	O
from	O
APT	O
and	O
Yum	O
repositories	O
.	O
</s>
<s>
They	O
are	O
also	O
available	O
in	O
the	O
Intel	O
oneAPI	B-Operating_System
HPC	O
Toolkit	O
which	O
includes	O
other	O
build	O
tools	O
,	O
such	O
as	O
libraries	O
,	O
and	O
analysis	O
tools	O
for	O
error	O
checking	O
and	O
performance	O
analysis	O
.	O
</s>
<s>
Containers	O
with	O
the	O
compilers	B-Language
are	O
on	O
Docker	O
Hub	O
.	O
</s>
<s>
Compiler	B-Language
version	O
Release	O
date	O
Major	O
new	O
features	O
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
8.0	O
December	O
15	O
,	O
2003	O
Precompiled	O
headers	O
,	O
code-coverage	O
tools	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
8.1	O
September	O
,	O
2004	O
AMD64	B-Device
architecture	O
(	O
for	O
Linux	B-Application
)	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
9.0	O
June	O
14	O
,	O
2005	O
AMD64	B-Device
architecture	O
(	O
for	O
Windows	B-Application
)	O
,	O
software-based	O
speculative	O
pre-computation	O
(	O
SSP	O
)	O
optimization	O
,	O
improved	O
loop	O
optimization	O
reports	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
10.0	O
June	O
5	O
,	O
2007	O
Improved	O
parallelizer	O
and	O
vectorizer	O
,	O
Streaming	O
SIMD	O
Extensions	O
4	O
(	O
SSE4	B-General_Concept
)	O
,	O
new	O
and	O
enhanced	O
optimization	O
reports	O
for	O
advanced	O
loop	O
transformations	O
,	O
new	O
optimized	O
exception	O
handling	O
implementation	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
10.1	O
November	O
7	O
,	O
2007	O
New	O
OpenMP*	O
compatibility	O
runtime	O
library	O
.	O
</s>
<s>
To	O
use	O
the	O
new	O
libraries	O
,	O
you	O
need	O
to	O
use	O
the	O
new	O
option	O
"	O
-Qopenmp	O
/Qopenmp	O
-lib:compat	O
"	O
on	O
Windows	B-Application
,	O
and	O
"	O
-openmp	O
-openmp-lib:compat	O
"	O
on	O
Linux	B-Application
.	O
</s>
<s>
This	O
version	O
of	O
the	O
Intel	O
compiler	B-Language
supports	O
more	O
intrinsics	O
from	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
2005	I-Application
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
11.0	O
November	O
2008	O
More	O
Fortran	B-Application
2003	O
support	O
.	O
</s>
<s>
Commercial	O
licenses	O
for	O
Windows	B-Application
version	O
include	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
2005	I-Application
Premier	O
Partner	O
Edition	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Compiler	I-Language
11.1	O
June	O
23	O
,	O
2009	O
Support	O
for	O
latest	O
Intel	O
SSE	O
,	O
AVX	O
and	O
AES	O
instructions	O
.	O
</s>
<s>
More	O
Fortran	B-Application
2003	O
support	O
.	O
</s>
<s>
Support	O
for	O
latest	O
Intel	B-Language
MKL	I-Language
release	O
(	O
included	O
in	O
compiler	B-Language
products	O
)	O
.	O
</s>
<s>
Commercial	O
licenses	O
for	O
Windows	B-Application
version	O
include	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
2008	O
Shell	O
and	O
libraries	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Composer	O
XE	O
2011	O
up	O
to	O
Update	O
5	O
(	O
compiler	B-Language
12.0	O
)	O
November	O
7	O
,	O
2010	O
Coarray	O
Fortran	B-Application
,	O
additional	O
2003	O
(	O
FINAL	O
subroutines	O
,	O
GENERIC	O
keyword	O
,	O
)	O
and	O
2008	O
(	O
Coarrays	O
,	O
CODIMENSION	O
,	O
SYNC	O
ALL	O
,	O
SYNC	O
IMAGES	O
,	O
SYNC	O
MEMORY	O
,	O
CRITICAL	O
,	O
LOCK	O
,	O
ERROR	O
STOP	O
,	O
ALLOCATE/DEALLOCATE	O
)	O
Intel	B-Language
Fortran	I-Language
Composer	O
XE	O
2011	O
Update	O
6	O
and	O
above	O
(	O
compiler	B-Language
12.1	O
)	O
September	O
8	O
,	O
2011	O
OpenMP	O
3.1	O
,	O
additional	O
2003	O
(	O
ALLOCATE	O
with	O
SOURCE	O
=	O
,	O
polymorphic	O
source	O
)	O
and	O
2008	O
standards	O
support	O
,	O
Windows	B-Application
version	O
ships	O
with	O
Visual	B-Application
Studio	I-Application
2010	O
Shell	O
.	O
</s>
<s>
Intel	B-Language
Fortran	I-Language
Composer	O
XE	O
2013	O
(	O
compiler	B-Language
13.0	O
)	O
September	O
5	O
,	O
2012	O
Linux-based	O
support	O
for	O
Intel	B-General_Concept
Xeon	I-General_Concept
Phi	I-General_Concept
coprocessors	I-General_Concept
,	O
support	O
for	O
Microsoft	B-Application
Visual	I-Application
Studio	I-Application
12	O
(	O
Desktop	O
)	O
,	O
support	O
for	O
gcc	O
4.7	O
,	O
support	O
for	O
Intel	O
AVX	O
2	O
instructions	O
,	O
updates	O
to	O
existing	O
functionality	O
focused	O
on	O
delivering	O
improved	O
application	O
performance	O
.	O
</s>
<s>
Continued	O
availability	O
of	O
the	O
Visual	B-Application
Studio	I-Application
2010	O
Shell	O
for	O
Windows	B-Application
versions	O
.	O
</s>
<s>
The	O
Intel	O
compiler	B-Language
provides	O
debugging	O
information	O
that	O
is	O
standard	O
for	O
the	O
common	O
debuggers	O
(	O
DWARF	O
2	O
on	O
Linux	B-Application
,	O
similar	O
to	O
gdb	B-Language
,	O
and	O
COFF	O
for	O
Windows	B-Application
)	O
.	O
</s>
<s>
The	O
flags	O
to	O
compile	B-Language
with	O
debugging	O
information	O
are	O
on	O
Windows	B-Application
and	O
on	O
Linux	B-Application
.	O
</s>
<s>
Debugging	O
is	O
done	O
on	O
Windows	B-Application
using	O
the	O
Visual	B-Application
Studio	I-Application
debugger	O
,	O
and	O
on	O
Linux	B-Application
using	O
gdb	B-Language
.	O
</s>
<s>
While	O
the	O
Intel	O
compiler	B-Language
can	O
generate	O
a	O
gprof-compatible	O
profiling	O
output	O
,	O
Intel	O
also	O
provides	O
a	O
kernel-level	O
,	O
system-wide	O
statistical	O
profiler	O
as	O
a	O
separate	O
product	O
called	O
VTune	B-Application
.	O
</s>
<s>
VTune	B-Application
features	O
an	O
easy-to-use	O
GUI	O
(	O
integrated	O
into	O
Visual	B-Application
Studio	I-Application
for	O
Windows	B-Application
,	O
Eclipse	B-Application
for	O
Linux	B-Application
)	O
as	O
well	O
as	O
a	O
command-line	O
interface	O
.	O
</s>
<s>
In	O
addition	O
to	O
the	O
VTune	B-Application
profiler	O
,	O
there	O
is	O
Intel	B-General_Concept
Advisor	I-General_Concept
that	O
specializes	O
in	O
vectorization	O
optimization	O
and	O
tools	O
for	O
threading	O
design	O
and	O
prototyping	O
.	O
</s>
<s>
Regarding	O
memory	O
errors	O
,	O
it	O
helps	O
detect	O
memory	B-Error_Name
leaks	I-Error_Name
,	O
memory	O
corruption	O
,	O
allocation/de	O
-allocation	O
of	O
API	O
mismatches	O
and	O
inconsistent	O
memory	O
API	O
usage	O
.	O
</s>
