Intel® Fortran Compilers

Fortran compilers for Windows*, Linux* and OS X*

  • Performance without compromise on Windows*, Linux* and OS X*
  • Broad support for current and previous Fortran standards, plus popular extensions
  • Intel® Math Kernel Library included in suites
  • Optional Rogue Wave IMSL* 7 Fortran Numerical Library on Windows

Limited-time discount for existing Intel® Visual Fortran customers! Click here.

Fortran only:
From $849
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Or Download Free Trial

Fortran & C/C++:
From $1,199
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Or Download Free Trial

A complete Fortran development environment for Windows*

  • Works with Microsoft Visual Studio* 2008, 2010, 2012 and 2013
  • Don't have Visual Studio? No problem - a Fortran development environment based on Microsoft Visual Studio 2010 Shell is included - nothing else to buy!
  • Develop, build, debug and run from the familiar Visual Studio IDE, or build and run from the command line - your choice!
  • 32-bit and 64-bit development included - no extra charge!
  • Create traditional console applications or advanced graphical interfaces with QuickWin, OpenGL* and Windows API support
  • COM (Component Object Model) and .NET interoperability provided
  • Build mixed-language applications with C++, Visual Basic*, Microsoft C# and more! (requires Microsoft Visual Studio)
  • Tens of thousands of declarations of routines, types and constants for Windows API, OpenGL, POSIX, dialogs, multi-byte character support and more!

Intel Fortran integration into Microsoft Visual Studio

 

  1. Fortran project and source files in Visual Studio
     
  2. Fortran-aware text editor with context-sensitive help,
    Go To Definition, templates, coloring and more
     
  3. Debug Fortran code with full access to Fortran types and arrays
     
  4. Build and debug mixed-language programs in a single Visual Studio solution
     
  5. Set breakpoints at Fortran source lines, with optional conditions


Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, nearly all of Fortran 2003, plus significant Fortran 2008 features
    • Coarrays
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support
  • Source compatible with Compaq Visual Fortran* - most projects just need a rebuild

Performance without compromise

  • Industry leading performance on Intel and AMD processors.  Take a look at the benchmarks below that were run by Polyhedron for independent confirmation.


Geomean time in seconds - lower is better
As published 3/10/2014 at http://www.polyhedron.com

  • Extensive optimizations for the latest Intel processors, including Intel® Xeon Phi™ coprocessor
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT, coarrays and Intel Xeon Phi coprocessor support
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Included in Fortran suites that adds advanced math processing
  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Click here for more information and pricing

Rogue Wave IMSL* 7 Fortran Numerical Library

  • Optional add-on to the suites that include Intel Visual Fortran compiler
  • Superior accuracy and reliability through 40 years of refinement
  • A comprehensive set of 1000+ algorithms
  • Supporting parallel processing architectures since 1990
  • Evolves easily with software and hardware upgrades
  • Click here for more information and pricing

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel Premier Support
  • Active user forums for help from experienced users and Intel engineers

Try & Buy

The Intel® Visual Fortran compiler is available in several development packages as listed below.

Product

Intel® Cluster Studio XE
Who needs this: Develop fast, reliable MPI cluster applications along with the features in Intel® Parallel Studio XE.

Includes: MPI library and MPI profiler along with the Intel C++ and Visual Fortran compiler, threading library, math library, media and data library, thread prototyping tool, memory & threading error checker and performance profiler.

Free Trial

Buy

Intel® Parallel Studio XE
Who needs this: Boost C++ and Fortran application performance, prototype thread implementations, eliminate memory and threading errors and tune for performance.

Includes: Intel® C++ and Visual Fortran compilers, threading library, math library, media and data library, thread prototyping tool, memory & threading error checker and performance profiler.

Free Trial

Buy

Intel® Fortran Studio XE
Who needs this: Boost Fortran application performance, prototype thread implementations, eliminate memory and threading errors and tune for performance.
Includes: Intel Visual Fortran compiler (no C++), math library, thread prototyping tool, memory and threading error checking and performance profiler.

Free Trial

Buy

Intel® Composer XE
Who needs this: Boost C++ and Fortran application performance for developers who do not need thread prototyping, error checking and performance profiling.

Includes:  Intel C++ and Visual Fortran compiler, threading library, math library and media and data library.

Free Trial

Buy

Intel® Fortran Composer XE
Who needs this: Boost Fortran application performance for developers who do not need thread prototyping, error checking and performance profiling.

Includes: Intel Visual Fortran compiler (no C++) and math library.

Free Trial

Buy

Works with your familiar development environment

  • Uses gcc tools, including gdb debugger
  • Link compatible with C and C++ from gcc
  • 32-bit and 64-bit compilers included – no extra charge!

Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, nearly all of Fortran 2003, plus significant Fortran 2008 features
    • Coarrays
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support

Performance without compromise

  • Industry leading performance on Intel and AMD processors. Take a look at the benchmarks below that were run by Polyhedron for independent confirmation.


Geomean time in seconds - lower is better
As published 3/10/2014 at http://www.polyhedron.com

  • Extensive optimizations for the latest Intel processors including Intel® Xeon Phi™ coprocessor
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT, coarrays and Intel Xeon Phi coprocessor support
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Included in Fortran suites that adds advanced math processing
  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Click here for more information

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel Premier Support
  • Active user forums for help from experienced users and Intel engineers

Try & Buy

The Intel Fortran compiler is available in several development packages as listed below.

Product

Intel® Cluster Studio XE
Who needs this: Develop fast, reliable MPI cluster applications along with the features in Intel® Parallel Studio XE.

Includes: MPI library and MPI profiler along with the Intel C++ and Fortran compiler, threading library, math library, media and data library, thread prototyping tool, memory & threading error checker and performance profiler.

Free Trial

Buy

Intel Parallel Studio XE
Who needs this: Boost C++ and Fortran application performance, prototype thread implementations, eliminate memory and threading errors and tune for performance.

Includes: Intel C++ and Fortran compiler, threading library, math library, media and data library, thread prototyping tool, memory & threading error checker and performance profiler.

Free Trial

Buy

Intel® Fortran Studio XE
Who needs this: Boost Fortran application performance, prototype thread implementations, eliminate memory and threading errors and tune for performance.
Includes: Intel Fortran compiler (no C++), math library, thread prototyping tool, memory and threading error checking and performance profiler.

Free Trial

Buy

Intel® Composer XE
Who needs this: Boost C++ and Fortran application performance for developers who do not need thread prototyping, error checking and performance profiling.

Includes:  Intel C++ and Fortran compiler, threading library, math library and media and data library.

Free Trial

Buy

Intel® Fortran Composer XE
Who needs this: Boost Fortran application performance for developers who do not need thread prototyping, error checking and performance profiling.

Includes: Intel Fortran compiler (no C++) and math library.

Free Trial

Buy

Works with your familiar development environment

  • Build from command line or use Xcode integration (limited feature)
  • Link compatible with C and C++ from gcc
  • 32-bit and 64-bit compilers included – no extra charge!

Broad support for current and previous Fortran standards, plus popular extensions

  • Full language Fortran 95, nearly all of Fortran 2003, plus significant Fortran 2008 features
    • DO CONCURRENT
    • 31 array dimensions (standard specifies 15)
    • NEWUNIT in OPEN
    • Much more - see release notes for details
  • Also supports FORTRAN IV (FORTRAN-66), FORTRAN 77 and Fortran 90
  • Extensive OpenMP 4.0* support

Performance without compromise

  • Industry leading performance
  • Extensive optimizations for the latest Intel processors
  • Take advantage of multicore, manycore and multiprocessor systems with OpenMP, automatic parallelism, DO CONCURRENT
  • Patented automatic CPU dispatch feature gets you code optimized for the current running processor

Intel® Math Kernel Library

  • Vectorized and threaded for highest performance on all Intel and compatible processors
  • De facto standard APIs for simple code integration
  • Compatible with all C, C++ and Fortran compilers
  • Royalty-free, per developer licensing for low cost deployment
  • Included in Intel® Fortran Composer XE
  • Click here for more information

Outstanding support

  • One year of support included with purchase – gives you access to all product updates and new versions released in the support period plus access to Intel Premier Support
  • Active user forums for help from experienced users and Intel engineers

Try & Buy

The Intel Fortran compiler is available as listed below.

Product

Intel® Fortran Composer XE
Who needs this: Boost Fortran application performance on OS X*

Includes: Intel Fortran compiler and math library.

Free Trial

Buy

Videos to help you get started.

  • Introduction to Intel® Visual Fortran in the Microsoft* Visual Studio* Development Environment
  • Optimizing your application with Intel® C++ and Fortran Compilers for Windows* and Linux*

Register for future Webinars


Previously recorded Webinars:

  • OpenMP 4.0 for SIMD and Affinity Features with Intel® Xeon® Processors and Intel® Xeon Phi™ Coprocessor
  • Learn to be an Intel® Visual Fortran Power User
  • Optimizing and Compilation for Intel® Xeon Phi™ Coprocessor

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Forum connectivity problems
By FortranFan9
Over the last couple of days, I often get an error in Internet Explorer 9 while trying to connect to IDZ forums.  The rendered html says something to the effect of, ".. sorry, but it appears out site is down.." With Google Chrome, I get strange error while trying to log into my profile. If I run a cleanup utility to clear all my temporary internet files, cookies, cache, etc., then I am able to connect again for some time before the problem reappears. Anyone else experiencing the same issues?
Cannot get rid of 2019 and 1120 errors
By Milos S.14
I'm having problem with these errors for weeks. I read every topic based on this problem but no advice worked for me. Visual Studio 2010 Professional and Intel(R) Visual Fortran Composer XE 2011. This is the output: 1>------ Rebuild All started: Project: Projekat, Configuration: Debug Win32 ------ 1>Build started 15-Apr-14 4:00:28 PM. 1>_PrepareForClean: 1>  Deleting file "Debug\Projekat.lastbuildstate". 1>InitializeBuildStatus: 1>  Touching "Debug\Projekat.unsuccessfulbuild". 1>ClCompile: 1>  Glavni.cpp 1>Glavni.obj : error LNK2019: unresolved external symbol _K1 referenced in function _main 1>C:\Users\Stevic\Documents\Visual Studio 2010\Projects\Projekat\Debug\Projekat.exe : fatal error LNK1120: 1 unresolved externals 1> 1>Build FAILED. 1> 1>Time Elapsed 00:00:01.09 2>------ Rebuild All started: Project: OtpRasp, Configuration: Debug Win32 ------ 2>Deleting intermediate files and output files for project 'OtpRasp', confi…
Setting upper and lower limits to integer variable values
By warwickb2
Hi, I would like to create a Percentage Type variable that can only have integer values between 0 and 100.  I can't see a way of specifying such a type.  The only limits that I can see are those that can be applied is to dimensions, not values.  Am I missing something, please?
F77 Data statement to F90 parameter - something not quite right
By TommyCee4
Here I go again - messing w/ F77 code from the late 90s.  This little subroutine has been converted to F90 but something's not quite right w/ the conversion of the 2 DATA statements.  The parameter statement I have "seems" right but compiler gives: Error: The shapes of the array expressions do not conform.   for [UPCASE],  [LWCASE], [INDCHECK] & [RUNSTREAM] Strangely, this line gives no compiler error but doesn't seem equivalent: character(1), parameter :: UPCASE = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ', lwcase = 'abcdefghijklmnopqrstuvwxyz' Is the real trouble the interaction with the INDEX intrinsic? Full code snippet is here: subroutine lowerUPPER(iString,Runstream) !================================================================================================100 ! Purpose: To convert all characters from lower case to UPPER CASE (using INDEX intrinsic function). ! Note that the character(80) 'Runstream' Variable Includes the Original Case for Echoing ! …
Visual Fortran run-time error
By Weilin D.6
I am in the process of running a exe file, and shortly after the start of the running the exe stops running and displays a WIndows box headed 'Visual Fortran run-time error' with the following message: forrtl: severe (157): Program Exception - access violation Image PC Routine Line Source roughcal.exe 00412E76 Unknown  Unknown  Unknown  The message only appears when I try to run this exe file. Other .exe files are ok and run very well. Anyone know how to deal with this problem?
Stack Trace
By P R.1
 Hello    I am trying to figure out what is wrong with my program because I caught an segmentation fault.I would like to know I can debug it to get the complete stack trace (which options). I also would like to know if I can do that using devenv.exe at the command prompt for any executable without opening the IDE      thanks
Unable to install the Fortran(x64)
By Weilin D.12
I have install Visual studio 2008 on my computer and now I want to install the fortran (X64). However, the installation failed and I got the following message: "Unable to install the integration into Visual Studio. Failure in"C:\\program files (86)\Microsoft Visual Studio 9.0\IntelFortran \VFPackages\integrate.bat" "c:\\program files(86)\Microsoft Visual Studio 9.0\Common7\Tools" (see picture) [[{"fid":"320507","view_mode":"default","fields":{"format":"default","field_file_image_alt_text[und][0][value]":"","field_file_image_title_text[und][0][value]":"","field_tags[und]":""},"type":"media","attributes":{"class":"media-element file-default"}}]] I found a post (https://software.intel.com/en-us/forums/topic/284459) regarding this problem, the solutions in that post didn't work for me. Anyone know how to deal with this? Thanks.
Fail to link 64-bit Code
By David B.6
I have a working 32-bit software library written in Fortran with low-level stuff in C/C++ It has worked for years. It is fine. When I re-build the library in 64-bit mode, none of the C functions are linked in. I've checked the linker options, and they all seem to be right. The project appears to be referencing the 64-bit libraries. Would someone mind just looking some sample  INTERFACE code and tell me whether there is anything at all that would cause a problem        SUBROUTINE PBZQS(MODE, IXORIG, IYORIG, NX, NY)       INTEGER MODE       INTEGER IXORIG, IYORIG       INTEGER NX, NY       INTERFACE         SUBROUTINE JB_ZBSpecInquireImageSize(MODE, IXORIG, IYORIG, NX,      1      NY)           INTEGER MODE           INTEGER IXORIG, IYORIG           INTEGER NX, NY           !DEC$ ATTRIBUTES C, ALIAS: '_JB_ZBSpecInquireImageSize' ::      1      JB_ZBSpecInquireImageSize           !DEC$ ATTRIBUTES VALUE :: MODE           !DEC$ ATTRIBUTES REFERENCE ::  IXORIG, IYORIG, NX, NY  …

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problem with openmp directives in gedit/emacs
By Marios G.1
Hello everyone, I am facing an awkward situation. I am trying to run a f90 program in Linux with ifort and since it has openmp directives I compile it with the -openmp-report1 option to see that whether the blocks have been successfully parallelized. The problem  is that gedit doesn't recognize the openmp directive: !$omp parallel do etc.it treats it as a comment. Anyone has an idea about it? I also tried C$omp parallel do etc...but in that case it produces a compile-time error. Do I have to enable an option in gedit in order to recognize the openmp directives? I faced the same problem in emacs. I note that I run successfully the SAME program with Intel Visual Fortran. In Visual Studio openmp directives are properly recognized. Thank you, Marios
write(*,*) in function called by another write(*,*)
By Simon5
Hello, I used to put some "write(*,*)" in my code when I want quick and easy checks of what is happening. Today I encountered an error while doing this with ifort : Here the sample program : program test implicit none write(*,*) func(),func() contains function func() real(8) :: func func=0.d0 write(*,*) "Inside func" end function funcAnd the output:  forrtl: severe (40): recursive I/O operation, unit -1, file unknown I guess, someway the compiler get lost with a write to * inside a write to *. Indeed if I change write(*,*) "Inside func" to write(6,*) "Inside func" (6 being preconnected to the default output), the error disappears. Changing to write(*,*) func() write(*,*) func()in the main part is ok too. Am I missing something in write mechanism that should forbide me to use it this way ? Gfortran compile and execute without error the code. Ifort version 14.0.2 Simon.
Debug/release versions of .mod files
By Simon B.5
If I have separate debug and release versions of a Fortran module, the difference being solely one of compiler flags, will the .mod file differ between them? In other words, is it necessary/advisable to change my include path depending on which version of the module I link to? I know the .mod file is a compiler-generated binary, but as a Fortran newbie coming from a C background I'm not sure whether I should be thinking of it as akin to a precompiled header or more like an object file in its own right. Thanks, Simon
Different results with -O0 -openmp or -O3 -openmp
By Jack S.4
Hi all,  I developed a FORTRAN (F90) code (its a large model) with the following compilation flags : ifort -g -O0 -openmp -openmp_report -threads -ipo When running this code with the above flags, I keep the results within 15 digits after the dot when running serial or parallel (OpenMP). I have also checked with Intel Inspector 2013 - and I do not have any data race condition in either if the subroutines. However, when I change the optimization compilation flag to -O2 or -O3, I get small error which growth with time (its a simulation which integrates with time) from the 15 digit toward larger numbers. I would like to prevent this from happening. The results with either -O2 or -O3 are different (up to the fifth digits after the dot). Can anyone advise on how can I, in general, improve my code (or some other compilation flags) in order it to run with the same precision (double precision) as with -O0 flag ? Thanks in advance, Jack.
inconsistent treatment of TYPE vs. REAL in 'stream' write with Intel big-endian I/O conversion
By tjahns2
I'm seeing different bit patterns when I write a REAL variable to file as component of a TYPE as opposed to when it's just a REAL in stream output while using the -convert big_endian option. Given the following small program, which opens a file in 'stream' access mode and the proceeds to write two REAL's: $ cat stream-write.f90 PROGRAM foo IMPLICIT NONE TYPE bar real :: x END TYPE bar INTEGER, PARAMETER :: file_id = 20 INTEGER :: ierror REAL :: y TYPE(bar) :: z OPEN(file_id, file="bsob.bin", iostat=ierror, action='write', & form='unformatted', access='stream', status='replace') y = 2.0 z%x = y WRITE(file_id) y WRITE(file_id) z FLUSH(file_id) CLOSE(file_id) END PROGRAM foo and compiling with $ ifort --version ifort (IFORT) 14.0.2 20140120 Copyright (C) 1985-2014 Intel Corporation. All rights reserved. $ ifort -convert big_endian -o stream-write stream-write.f90 $ ./stream-write $ hexdump bsob.bin 0000000 0040 0000 0000 4000 0000008 …
Deferred length string component: segmentation fault
By Chris Savage3
In a project I am working on, I changed a fixed length string in a structure within a module to a deferred length string and the result was an internal compiler error (the code compiled and ran without issue before the change).  I cannot reproduce the internal compiler error with a simple case, but I do get a segmentation fault in the below program when it hits the WRITE() statement.  It is unclear to me what the issue is or if this is even related to the internal compiler error I was trying to reproduce.  When compiling with '-std03', I get "warning #5436: Overlapping storage initializations encountered with S", so maybe it has something to do with the initialization, though I do not see multiple initializations here. Fortran compiler version is Version 14.0.2.144 (64-bit), on Ubuntu 14.04 (beta). The code is also attached: MODULE stringmod TYPE, PUBLIC :: A CHARACTER(LEN=:), ALLOCATABLE :: string END TYPE TYPE(A), SAVE :: S = A('_test__TEST_') CONTAINS SUBROUTINE TestPri…
ifort 11.1 and O2 optimization: wrong results
By Pierre T.2
Dear all, The code in question: !################## ! MODULE FOR TYPES !################## MODULE mod_types   IMPLICIT NONE   PRIVATE   PUBLIC :: type_glob, type_geom, type_edge   !-------------   ! Type node   !-------------   TYPE type_node      REAL :: X = 0.D0      REAL :: Y = 0.D0         END type type_node     !-------------   ! Type edge   !-------------   TYPE type_edge      TYPE(type_node) :: node1      TYPE(type_node) :: node2      REAL :: Len = 0.D0         END type type_edge     !-------------   ! Type geom   !-------------   TYPE type_geom      TYPE(type_edge), POINTER, DIMENSION(:) :: tabEdge => NULL()         END type type_geom     !-------------   ! Type glob   !-------------   TYPE type_glob      INTEGER :: nbBody = 0      TYPE(type_geom), POINTER, DIMENSION(:) :: geom => NULL()         END type type_glob END MODULE mod_types   !##################### ! MODULE FOR ROUTINES !##################### MODULE mod_sub   USE mod_ty…
!$OMP SIMD or !DIR$ SIMD ?
By Wentao Z.5
Hi, I have two quick questions regarding using SIMD directives. (1) I am currently using !DIR$ SIMD to help the compiler to vectorize the loops. But I just noticed that in OpenMP 4.0 we have the following directives: !$OMP SIMD !$OMP END SIMD I am a little bit confused about why we need !$OMP SIMD since !DIR$ SIMD works for both non-openmp code and openmp code. !$OMP SIMD only works when I add the compiler option -openmp to generate openmp code, right? (2) What about the portability of the SIMD directives (!DIR$ SIMD or !$OMP SIMD)? Later I may test my code on different platforms with different compilers. I guess !DIR$ SIMD only works with Intel compiler while !$OMP SIMD may be supported by more vendors. Thanks for your time and help! Best regards,    Wentao

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