ISO Fortran 2008
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| ISO Fortran 2008 | |
|---|---|
| Name | ISO Fortran 2008 |
| Status | Published |
| Year | 2008 |
| Organization | International Organization for Standardization |
| Abbreviation | Fortran 2008 |
ISO Fortran 2008 is the 2008 revision of the standardized Fortran programming language, produced by the International Organization for Standardization committee that succeeded earlier standards such as Fortran 77 and Fortran 90. The revision updated language features, introduced parallel programming facilities, and aimed to modernize support for scientific and engineering applications used by institutions like CERN, NASA, and Los Alamos National Laboratory. The standard was developed within the ISO/IEC JTC 1/SC 22/WG 5 working group and influenced implementations from vendors such as Intel Corporation, GNU Project, and NAG.
Background and Standardization
Fortran's lineage traces to the IBM 1950s era with pioneers connected to the Massachusetts Institute of Technology and the University of Cambridge computing efforts; the 2008 revision continued a history including Fortran 66, Fortran 77, and Fortran 95. The standardization process involved national bodies including ANSI, BSI, DIN, and AFNOR, coordinated under the ISO and IEC framework and informed by academic groups at MIT Lincoln Laboratory, Argonne National Laboratory, and Oak Ridge National Laboratory. Major contributors included representatives from corporations like IBM, Cray Research, and Fujitsu, and research centers such as Los Alamos National Laboratory and Lawrence Livermore National Laboratory. Debates at meetings in cities like Geneva, Paris, and Tokyo reflected input from standards committees and user communities drawn from European Organization for Nuclear Research projects and national supercomputing centers.
Language Features and Enhancements
Fortran 2008 extended features present in Fortran 95 by adding syntax and semantics for improved safety, interoperability, and abstraction. It enhanced array operations used in projects at Princeton University and Stanford University by refining intrinsic procedures and elemental functions relevant to numerical libraries maintained at Netlib. Object-oriented extensions influenced by work at Bell Labs and AT&T were formalized alongside module and interface improvements used in scientific codes at Imperial College London. New intrinsic procedures and enhanced parameter attributes supported interoperability with C APIs developed at Microsoft Research and Apple Inc. research labs. The revision addressed input/output capabilities, extending formatted I/O behavior relied upon by teams at European Space Agency and JAXA.
Parallelism and Coarray Fortran
A landmark addition was the standardization of coarray semantics to enable partitioned global address space programming, reflecting parallel computing research from Cray Research, Hewlett-Packard, and Lawrence Berkeley National Laboratory. Coarray features were informed by work at Argonne National Laboratory and integrated into high-performance computing environments used by National Center for Atmospheric Research and NOAA. The coarray model provided syntax for distributed memory parallelism comparable to efforts like Message Passing Interface and concepts investigated at Los Alamos National Laboratory and Sandia National Laboratories. The model influenced parallel language research at Massachusetts Institute of Technology and University of Illinois Urbana-Champaign and interacted with runtime systems developed by vendors such as Intel Corporation and Cray Inc..
Technical Specifications and Compatibility
The standard document specified conformity, corner-case semantics, and bindings intended for compatibility with prior standards produced by ISO and national bodies including ANSI. It defined Fortran/C interoperability aligning with ISO/IEC specifications used by compilers from GNU Project and commercial offerings from NAG and PathScale. Backward compatibility considerations reflected legacy codebases from institutions like Brookhaven National Laboratory and CERN while also enabling modernization paths pursued by software teams at Siemens and General Electric. The standard addressed floating-point behavior relevant to implementations on hardware from Intel Corporation, AMD, and ARM Holdings.
Implementations and Compiler Support
Compiler vendors and open-source projects adopted the standard incrementally: GCC (via GNU Fortran), Intel Fortran Compiler, NAG Fortran Compiler, and vendor-specific compilers from Cray Inc. and IBM implemented substantial portions. Research groups at University of California, Berkeley and companies such as NVIDIA explored optimization and GPU offloading approaches compatible with the standard's features. The ecosystem included debugging and analysis tools from Perforce and profiling suites used at Argonne National Laboratory and Lawrence Livermore National Laboratory. Standards compliance testing and conformance suites were produced by consortia involving ISO members and testing labs in France, Germany, and Japan.
Adoption and Impact on Scientific Computing
Adoption in computational science communities—projects at CERN, climate modeling centers like UK Met Office, and astrophysics groups at NASA Goddard Space Flight Center—was driven by the language's suitability for numeric arrays and legacy code. The standard influenced numerical libraries such as LAPACK, BLAS, and codebases used in simulations by Los Alamos National Laboratory and Oak Ridge National Laboratory. Training programs at universities such as University of Cambridge and ETH Zurich continued to include Fortran in curricula for scientific computing. The 2008 revision impacted high-performance computing workflows at national facilities like NERSC and PRACE and shaped collaborations among academic, government, and industrial stakeholders including Siemens, General Electric, and Schlumberger.