Get Started

  • 2022.2
  • 09/08/2022
  • Public Content

Get Started with the Intel® Fortran Compiler Classic and Intel® Fortran Compiler

The Intel® Fortran Compiler Classic and Intel® Fortran Compiler provide optimizations that help your applications to run faster on Intel® 64, and IA-32 architectures, with support for the latest Fortran language standards. This compiler produces optimized code that can run significantly faster by taking advantage of the ever-increasing core count and vector register width in Intel® Xeon® processors and compatible processors. The Intel® Compiler will help you boost application performance through superior optimizations and Single Instruction Multiple Data (SIMD) vectorization, integration with Intel® Performance Libraries, and by leveraging the OpenMP* 5.0/5.1 parallel programming model.
Start using the compiler from the command line or within Microsoft Visual Studio*.
macOS* is not supported for the
Support for 32-bit targets is deprecated in
and may be removed in a future release.
does not support 32-bit targets.

Use of the Intel® Fortran Compiler

The Intel® Fortran Compiler (
) is a new compiler based on the Intel® Fortran Compiler Classic (
) frontend and runtime libraries, using LLVM backend technology. At this time,
supports features of the Fortran 95 language, and most OpenMP 5.0/5.1 directives and offloading features.
is binary (.o/.obj) and module (.mod) file compatible; binaries and libraries generated with
can be linked with binaries and libraries built with
, and .mod files generated with one compiler can be used by the other. Both compilers use the
runtime libraries.
-fp-model fast
-fp-model fast=2
options behave differently with
. With
, floating point compares happen as specified by the IEEE floating point standard, in that the code sequence generated for them assumes a compare can involve a NaN.
does not generate the check for NaN operands. If using
-fp-model fast
-fp-model fast=2
and NaN compares are desired to match
's behavior, the -assume nan_compare option should be added to the command line.

Find More

The Developer Guide and Reference contains information on:
  • How to use the command line
    or Microsoft* Visual Studio*
    or Xcode*
    or the Eclipse* CDT
  • Support for the latest compiler technologies and architectures.
  • Compiler reference material, including options, program structures, class and math libraries, and much more
Explore the latest oneAPI Fortran code samples.
Explore tutorials, training materials, and other Fortran documentation.
Information on product installation, new and changed features, and issues that are not described in the product documentation.
Ask questions and find answers in the Intel® Fortran Compiler forum.
Add oneAPI components to a Yocto project build using the meta-intel layers.
Command-line Help
Access general help for compiler options at the command line after setting up the environment.
  • ifort -help
  • ifx -help
  • man ifort
  • man ifx
  • ifort -help
  • man ifort
  • ifort /help
  • ifx /help

Notices and Disclaimers

Intel, the Intel logo, Intel Atom, Intel Core, Intel Xeon Phi, VTune and Xeon are trademarks of Intel Corporation in the U.S. and/or other countries.
*Other names and brands may be claimed as the property of others.
Microsoft, Windows, and the Windows logo are trademarks, or registered trademarks of Microsoft Corporation in the United States and/or other countries.
© Intel Corporation.
This software and the related documents are Intel copyrighted materials, and your use of them is governed by the express license under which they were provided to you (
). Unless the License provides otherwise, you may not use, modify, copy, publish, distribute, disclose or transmit this software or the related documents without Intel's prior written permission.
This software and the related documents are provided as is, with no express or implied warranties, other than those that are expressly stated in the License.

Product and Performance Information


Performance varies by use, configuration and other factors. Learn more at