 






     Software
     Product
     Description

     ________________________________________________________________

     PRODUCT NAME:  VAX FORTRAN, Version 5.6             SPD 25.16.36

     DESCRIPTION

     VAX FORTRAN is an implementation of full language FORTRAN-77
     conforming to American National Standard FORTRAN, ANSI X3.9-
     1978. It includes optional support for programs conforming to
     the previous standard, ANSI X3.9-1966. VAX FORTRAN meets the
     Federal Information Processing Standard Publication (FIPS-69-1)
     requirements by conforming to the ANSI Standard and by including
     a flagger. The flagger optionally produces diagnostic messages
     for compile-time elements that do not conform to the Full-Level
     ANSI FORTRAN X3.9-1978 Standard. VAX FORTRAN also conforms
     to the International Standard ISO 1539-1980(E). VAX FORTRAN
     conforms to MIL-STD 1753 with the exception of the specific
     syntax for octal and hex constants.

     The sharable, reentrant compiler operates under the VMS Op-
     erating System. It globally optimizes source programs while
     taking advantage of the VAX floating point and character string
     instruction set and the VMS virtual memory system.

     VAX FORTRAN includes the following enhancements to the ANSI
     standard:

     o  Directives to support parallel decomposition of DO-loops on
        multiprocessor VMS systems

     o  Directives to control listing page titles and subtitles,
        object file identification field, and some attributes of
        common blocks


                                  DIGITAL                January 1991

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     VAX FORTRAN, Version 5.6                            SPD 25.16.36



     o  Composite data declarations using STRUCTURE, END STRUC-
        TURE, and RECORD statements, and access to record components
        through field references

     o  A set of data types beyond those specified for full language
        FORTRAN-77:

        -  LOGICAL*1, BYTE

        -  LOGICAL*2

        -  INTEGER*2

        -  COMPLEX*16, DOUBLE COMPLEX

        -  REAL*16

     o  Explicit specification of storage allocation units for data
        types (e.g., REAL*8, INTEGER*4)

     o  Data initialization in type declaration statements

     o  IMPLICIT NONE statement

     o  INCLUDE statement

     o  NAMELIST-directed I/O

     o  31-character identifiers that can include dollar sign ($) and
        underscore (_)

     o  DO WHILE and ENDDO statements

     o  Bit manipulation functions

     o  Language elements for keyed and sequential access to VAX RMS
        indexed organization files

     o  Hexadecimal and octal constants and Z and O format edit
        descriptors applicable to all data types

     o  ENCODE and DECODE statements

     o  ACCEPT and TYPE input/output statements

     o  DEFINE FILE statement

     o  USEROPEN subroutine invocation at file OPEN time

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     VAX FORTRAN, Version 5.6                            SPD 25.16.36



     o  Comments allowed at end of each source line

     o  Debug statements in source

     o  Language elements that support the VAX extended range and
        extended precision floating point architectural features:

        -  64-bit G_floating data type, with an 11-bit exponent and
           53-bit mantissa, which provides a range of 0.56*10**-308
           to 0.09*10**308 and a precision of 15 decimal digits

        -  128 bit H_floating data type, with a 15-bit exponent and a
           113-bit mantissa, which provides a range of 0.84*10**-4932
           to 0.59*10**4932 and a precision of 33 decimal digits

     Additional Features

     o  Generation of optional diagnostic messages for extensions not
        supported by Digital's ULTRIX and VAXELN Operating Systems

     o  Support for translation of VAX CDD/Plus records into FORTRAN
        records

     o  Support for calls to VMS system service procedures

     o  Generation of symbol tables for the VAX Symbolic Debugger

     o  Generation of Cross Reference Listings

     o  Generation of sharable code

     o  Up to 255 actual arguments in a CALL statement

     o  Up to 250 named COMMON blocks per subprogram

     o  Support for providing error diagnostics to the VAX Language-
        Sensitive Editor component and cross-reference information
        to the VAX Source Code Analyzer component of VAX Language-
        Sensitive Editor/Source Code Analyzer

     o  Support for low level program design, including the process-
        ing of pseudocode and the extraction of design information
        from comments

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     VAX FORTRAN, Version 5.6                            SPD 25.16.36



     The VAX FORTRAN compiler provides a multi-phase optimizer that
     is capable of performing optimizations across entire program
     units. Specific optimizations performed include:

     o  Constant folding

     o  Optimizations of arithmetic IF, logical IF, and block IF-
        THEN-ELSE

     o  Global common subexpression elimination

     o  Removal of invariant expressions from loops

     o  Global allocation of general registers across program units

     o  In-line expansion of statement functions

     o  Optimization of array addressing in loops

     o  Value propagation

     o  Deletion of redundant and unreachable code

     Note: VAX FORTRAN does not support the use of FDML statements
     within parallel DO-loops.

     HARDWARE REQUIREMENTS

     VAX, MicroVAX, VAXstation, or VAXserver configuration as speci-
     fied in the System Support Addendum (SSA 25.16.36-x).

     SOFTWARE REQUIREMENTS

     For Systems Using Terminals: (No DECwindows Interface)

     VMS Operating System

     For Workstations Running VWS:

     VMS Operating System
     VMS Workstation Software

     For Workstations Running DECwindows:

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     VAX FORTRAN, Version 5.6                            SPD 25.16.36



     VMS Operating System (and necessary components of VMS DECwin-
     dows)

     VAX FORTRAN supports a DECwindows compiler interface for com-
     pile qualifier selection on workstations. This interface is
     accessible from FileView.

     *  Refer to the System Support Addendum (SSA 25.16.36-x) for
        availability and required versions of prerequisite/optional
        software and for information regarding components of VMS
        DECwindows.

     ORDERING INFORMATION

     Software Licenses: QL-100A*-**
     Software Media: QA-100A*-**
     Software Documentation: QA-100AA-GZ
     Software Product Services: QT-100A*-**

     *  Denotes variant fields. For additional information on avail-
        able licenses, services, and media, refer to the appropriate
        price book.

     SOFTWARE LICENSING

     This software is furnished under the licensing provisions of
     Digital Equipment Corporation's Standard Terms and Conditions.

     For more information about Digital's licensing terms and poli-
     cies, contact your local Digital office.

     LICENSE MANAGEMENT FACILITY SUPPORT

     This layered product supports the VMS License Management Facil-
     ity.

     License units for this product are allocated on a CPU-capacity
     basis.

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     VAX FORTRAN, Version 5.6                            SPD 25.16.36



     For more information on the License Management Facility, refer
     to the VMS Operating System Software Product Description (SPD
     25.01.xx) or the VMS Operating System documentation set.

     For more information on Digital's licensing terms and policies,
     contact your local Digital office.

     SOFTWARE PRODUCT SERVICES

     A variety of service options are available. For more informa-
     tion, please contact your local Digital office.

     SOFTWARE WARRANTY

     Warranty for this software product is provided by Digital with
     the purchase of a license for the product as defined in the
     Software Warranty Addendum of this SPD.

     [TM] The DIGITAL Logo, DECwindows, MicroVAX, RMS, ULTRIX, VAX,
          VAX CDD, VAXcluster, VAXELN, VAX FORTRAN, VAXft, VAXserver,
          VAXstation, and VMS are trademarks of Digital Equipment
          Corporation.

















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