Lahey/GNU Fortran for 32-bit/64-bit Windows

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Lahey/GNU Fortran for 32-bit/64-bit Windows

Published By:  Lahey Computer Systems, Inc.

Full Fortran 77, 90 and 95 compliance with extensive support for the Fortran 2003 and 2008 standards.

Product Variants

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System Req.

The Lahey/GNU Fortran compiler contains a high-performance code generator and automatic parallelisation technology to deliver the most-productive, best-supported Fortran language system for the PC yet. Built using the latest source, the Lahey GFortran compiler is the most capable and up to date GFortran build available. To support the compiler, Lahey provides a sophisticated Visual Studio development environment with an unprecedented level of Fortran-intelligent features to dramatically improve programming productivity.

LG Fortran Optimisations

Basic optimisation
  • Constant folding
  • Common subexpression elimination
  • Predictive commoning
  • Copy propagation optimisation
  • Branch and jump optimisations
  • Algebraic simplification
  • Variable tracking
  • Dead code elimination
  • Peephole optimisations
  • Loop invariant code motion
  • Register move optimisations
  • Instruction scheduling
  • Address calculation optimisation
  • Array optimisation.

Program reconstruction optimisations
  • Parma Polyhedra Graphite optimisations
  • Loop unrolling
  • Loop interchange
  • Loop blocking
  • Loop peeling
  • Loop strip-mining
  • Tree-level loop optimisations
  • Loop parallelisation
  • Tree vectorisation of loops
  • Function reordering.

Procedure optimisation
  • Code Inlining
  • Stack Optimisation
  • Inter-procedural optimisations
  • Whole-program optimisation.

  • Support for the following processors: i386, i486, i586, pentium, pentium-mmx, pentiumpro, i686, pentium2, pentium3, pentium3m, pentium-m, pentium4, pentium4m, prescott, nocona, core2, corei7, corei7-avx, core-avx-i, atom, k6, k6-2, k6-3, athlon, athlon-tbird, athlon-4, athlon-xp, athlon-mp, k8, opteron, athlon64, athlon-fx, k8-sse3, opteron-sse3, athlon64-sse3, amdfam10, barcelona, bdver1, bdver2, btver1, winchip-c6, winchip2, c3, c3-2, geode
  • Set FPU floating point precision
  • Prefetch optimisation
  • Fast input/output libraries
  • Supports AVX, AVX2, BMI2, FMA2, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 built-in functions and instructions.

Statically link GCC object files

LG Fortran allows static linking with object files generated by the companion GCC C compiler and supports the ISO_C_BINDING intrinsic module. Combine your Fortran and C code into one executable. For the routines you don't want to develop yourself, you can also link with C/C++ routines from commercially available libraries.

DLL Interfaces to Visual Basic, Visual C/C++, GCC and Microsoft .NET Languages

Create 32 and 64 bit Windows DLLs from your Fortran code and call the Fortran routines from 32 and 64 bit Windows programs created with Microsoft Visual Basic, Microsoft Visual C++, and Microsoft .NET languages.

Legacy Fortran support

LG Fortran provides an easy means of upgrading your old LF Fortran project files to work in the LGF development environment. The LGF project facility even supports switching compilers so that projects can use LF95 instead of LGF. LG Fortran extends its language support in other directions adding many legacy Fortran features, including g77 support and the various UNIX service routines. These features further facilitate your move to cost/performance efficiency on the PC platform.

Create highly optimised, inheritable, instantiable and static class objects

LG Fortran is a complete implementation of the ANSI/ISO Fortran 95 standard, provides major support for Fortran 2003, and extends significant support for the Fortran 2008 Standard.
  • Fortran 2003 - offers major improvements over Fortran 95, largely completing the ability to perform object oriented programming begun with Fortran 90.
  • Fortran 2008 - is a minor revision in comparison with Fortran 2003, most notably, it standardises support for the long-standing concept of co-arrays from High Performance Fortran (HPF).

Visual Studio 2012 shell with Lahey's exclusive Fortran support

Lahey's Visual Studio Fortran support is the most feature complete Visual Studio environment available. Their attitude is that the Fortran programmer deserves all the features and conveniences that the C# or Visual Basic programmer enjoys.

Winteracter Starter Kit

Use the Winteracter Starter Kit -WiSK - to create GUI-based Fortran programs, using standard Windows controls. WiSK is a subset of the Winteracter toolset created by Interactive Software Services, Ltd. Winteracter is a Fortran callable, user-interface and graphics development kit with versions available for Windows, Linux and Mac OS X . Derived from Winteracter, WiSK provides a library of subroutines to manage user interface components such as windows, menus, dialogs, mouse and keyboard. Menus and dialogs are designed/maintained using the supplied visual resource editor, ResEdit. A manifest creation tool enables use of the latest visual styles on Windows XP onwards. A set of graphics primitives are also included in the WiSK library, along with source code for an emulation of the earlier Lahey Video Graphics Library. WiSK is completed by the Application Wizard, which provides a jump start when producing new GUI based applications.


  • 1 GHz or higher, Intel or AMD processor (Pentium III or better)
  • 1 GB or more RAM
  • 1024x600 display (Recommended Minimum for Visual Studio).

Operating System

LG Fortran and Visual Studio 2012 or 2010 can be installed onto any of the following systems:
  • Windows 8 (32 and 64 bit)
  • Windows 7 (32 and 64 bit)
  • Windows Vista (32 and 64 bit) with Service Pack 2 (SP2) - all editions except Starter Edition
  • Windows XP with Service Pack 3 (SP3)
  • Windows Server 2008 R2 (x64)
  • Windows Server 2008 (32 and 64 bit) with Service Pack 2 (SP2)
  • Windows Server 2003 R2 (x64)
  • Windows Server 2003 (32 and 64 bit) with Service Pack 2 (SP2).

Target Operating System

LG Fortran applications are compatible with Microsoft Windows 8, 7, Vista, XP, 2000, NT 4.0, Me, 98, and 95.
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