Intel® Fortran Compiler for Linux* 19.1 Release Notes for Intel® Parallel Studio XE 2020

Published: 12/16/2019  

Last Updated: 11/20/2020

By Igor Vorobtsov

This document provides a summary of new and changed product features and includes notes about features and problems not described in the product documentation.

Please see the licenses included in the distribution as well as the Disclaimer and Legal Information section of these release notes for details. Please see the following links for information on this release of the Intel® Fortran Compiler 19.1.

Change History

This section highlights important changes from the previous product version and changes in product updates.

Changes in Update 4 (Intel® Fortran Compiler 19.1.3)

  • Corrections to reported problems

Changes in Update 3

  • No changes to Fortran on Linux*.

NOTE: Intel® Parallel Studio XE 2020 Composer Edition for Fortran and C++ Linux* contains an update to the Intel® C++ Compiler next generation code generator. This is invoked using the -qnextgen option to the ICC and ICPC compilers. This update to the Intel® C++ Compiler next generation code generator includes our latest updates and features for our C++ next generation compiler invoked with the -qnextgen option.

  • There are no new features, bug fixes, or security enhancements for the Intel® Fortran Compiler or the Intel® C++ Compiler without the -qnextgen option.
  • Intel® Parallel Studio XE 2020 Update 3 is available for the Intel® Parallel Studio XE 2020 Composer Edition for Fortran and C++ Linux*.
  • This is a Linux-only release: there is no Update 3 release for either Windows* or macOS* operating systems.
  • In addition, it is only a Composer Edition release: there is no Update 3 release for either Professional or Cluster Editions of Intel® Parallel Studio XE 2020.
  • There is no update to the Intel® C++ and Fortran Compilers Redistributable Libraries. The Update 2 versions of these libraries are compatible and should be used.
  • There is no update for the Intel® Parallel Studio XE Runtime 2020 YUM* and APT* repository packages. Continue to use the Update 2 packages of this runtime.

Changes in Update 2 (Intel® Fortran Compiler 19.1.2)

  • Corrections to reported problems

Changes in Update 1 (Intel® Fortran Compiler 19.1.1)

  • Corrections to reported problems

Changes since Intel® Fortran Compiler 19.0 (New in Intel® Fortran Compiler 19.1.0)

Back to top

System Requirements

  • A PC based on an Intel® 64 architecture processor supporting the Intel® Streaming SIMD Extensions 2 (Intel® SSE2) instructions (Intel® 2nd Generation or newer Generation of Intel® Core™ i3, i5, or i7 processors and Intel® Xeon® E3, E5 or E7 processor family, or compatible non-Intel processor)
    • Development for a 32-bit on a 64-bit host may require optional library components (ia32-libs, lib32gcc1, lib32stdc++6, libc6-dev-i386, gcc-multilib, g++-multilib) to be installed from your Linux distribution.
  • For the best experience, a multi-core or multi-processor system is recommended
  • 2GB of RAM (4GB recommended)
  • 14GB free disk space for all features
  • For development of IA-32 or Intel® 64 architecture applications, one of the following Linux distributions (this is the list of distributions tested by Intel; other distributions may or may not work and are not recommended - please refer to Technical Support if you have questions):
    • Red Hat Enterprise Linux* 7, 8
    • CentOS 8
    • Ubuntu* 18.04 LTS, 19.04
    • Fedora* 30
    • SuSE LINUX Enterprise Server* 15
    • Debian* 10.0
  • Linux Developer tools component installed, including gcc, g++ and related tools. (this is the list of component versions tested by Intel; other versions may or may not work and are not recommended - please refer to Technical Support if you have questions
    • gcc 4.8.5 to gcc 9.0.1
    • binutils 2.27 to binutils 2.31.1
  • Library libunwind.so is required in order to use the -traceback option. Some Linux distributions may require that it be obtained and installed separately.

Notes

  • The Intel® compilers are tested with a number of different Linux distributions, with different versions of gcc. The version of glibc you use must be consistent with the version of gcc in use. For best results, use only the gcc versions as supplied with distributions listed above.
  • Compiling very large source files (several thousands of lines) using advanced optimizations such as -O3, -ipo and -qopenmp, may require substantially larger amounts of RAM.
  • Some optimization options have restrictions regarding the processor type on which the application is run. Please see the documentation of these options for more information.

Back to top

How To Install the Intel® Fortran Compiler

Installation instructions are shipped with all Intel® Software Development Products as part of the documentation. Installation guides for the latest Intel® Parallel Studio XE version are also available online. Please check Intel® Parallel Studio XE getting started page for installation guides. Note that link to Installation Guide is also available on Intel® Registration Center while downloading required installation package. Please refer to Installation FAQ for more details.

How To Use the Intel® Fortran Compiler

Intel® Parallel Studio XE 2020: Getting Started with the Intel® Fortran Compiler 19.1 for Linux* at <install-dir>/documentation_2020/en/compiler_f/ps2020/get_started_lf.htm contains information on how to use the Intel® Fortran Compiler.

Back to top

Documentation

Product documentation is linked from <install-dir>/documentation_2020/en/compiler_f/ps2020/get_started_lf.htm.

Offline Core Documentation Removed from the Installed Image

Offline core documentation is removed from the Intel® Parallel Studio XE installed image. The core documentation for the components of Intel® Parallel Studio XE are available at the Intel® Software Documentation Library for viewing online. Offline documentation for older versions is also available from the Intel® Software Development Products Registration Center: Product List > Intel® Parallel Studio XE Documentation and from Download Documentation.

User and Reference Guides, What's New and Release Notes, Installation Guides

Refer to the Intel® Parallel Studio XE Support – Documentation for additional User and Reference Guides, What’s New and Release Notes, and Installation Guides.

Back to top

Japanese Language Support

Japanese language support is not provided with this release of the product.

If you wish to use Japanese-language support on an English-language operating system, or English-language support on a Japanese-language operating system, you will find instructions at Changing Language Setting to see English on a Japanese OS environment or Vice Versa on Linux*.

Back to top

Intel-provided Debug Solutions

Intel®-provided debug solutions are based GNU* GDB. Please see Intel® Parallel Studio 2020 Composer Edition Fortran - Debug Solutions Release Notes for further information.

Back to top

Samples

Product samples are now available online at Intel® Software Product Samples and Tutorials.

Back to top

Redistributable Libraries

Refer to the Redistributable Libraries for Intel® Parallel Studio XE for more information.

Back to top

Technical Support

Register your license at the Intel® Software Development Products Registration Center. Registration entitles you to free technical support, product updates and upgrades for the duration of the support term.

For information about how to find Technical Support, Product Updates, User Forums, FAQs, tips and tricks, and other support information, please visit: http://www.intel.com/software/products/support/

Note: If your distributor provides technical support for this product, please contact them for support rather than Intel.

Back to top

Compatibility

In general, object code and modules compiled with earlier versions of Intel Fortran Compiler for Linux* (8.0 and later) may be used in a build with version 19.1. Exceptions include:

  • Sources that use the CLASS keyword to declare polymorphic variables and which were built with a compiler version earlier than 12.0 must be recompiled.
  • Objects built with the multi-file interprocedural optimization (-ipo) option must be recompiled with the current version.
  • Objects that use the REAL(16), REAL*16, COMPLEX(16) or COMPLEX*32 datatypes and which were compiled with versions earlier than 12.0 must be recompiled.
  • Objects built for the Intel® 64 architecture with a compiler version earlier than 10.0 and that have module variables must be recompiled. If non-Fortran sources reference these variables, the external names may need to be changed to remove an incorrect leading underscore.
  • Modules that specified an ATTRIBUTES ALIGN directive outside of a derived type and were compiled with versions earlier than 11.0 must be recompiled. The compiler will notify you if this issue is encountered.
  • Modules that specified an ATTRIBUTES ALIGN directive inside a derived type declaration cannot be used by compilers older than 13.0.1.
  • The implementation of the Fortran 2008 submodules feature required extensive changes to the internal format of binary .mod files. Therefore module files created by the version 16.0 or newer Fortran compiler cannot be used with version 15.0 or older Fortran compilers.
  • Objects/libraries compiled/built for the Intel® Xeon Phi™ x100 product family are not compatible with objects/libraries compiled/built for the Intel® Xeon Phi™ x200 product family.
  • Objects built with Intel Fortran Compiler version 18.0 and earlier version of regcall calling convention must be recompiled with 19.0 or newer. Intel library libirng uses regcall. Version of this library shipped with 19.0 compiler version or newer is not compatible with older versions. regcall is implicitly used by following attribute:
    !DIR$ ATTRIBUTES [att,] VECTOR [:clause] [, att]... :: routine-name

Back to top

Stack Alignment Change for REAL(16) and COMPLEX(16) Datatypes

In versions prior to 12.0, when a REAL(16) or COMPLEX(16) (REAL*16 or COMPLEX*32) item was passed by value, the stack address was aligned at 4 bytes. For improved performance, the version 12 and later compilers align such items at 16 bytes and expects received arguments to be aligned on 16-byte boundaries. This change is also compatible with gcc.

This change primarily affects compiler-generated calls to library routines that do computations on REAL(16) values, including intrinsics. If you have code compiled with earlier versions and link it with the version 12 libraries, or have an application linked to the shared version of the Intel run-time libraries, it may give incorrect results.

In order to avoid errors, you must recompile all Fortran sources that use the REAL(16) and COMPLEX(16) datatypes if they were compiled by compiler versions earlier than 12.0.

Back to top

New and Changed Compiler Features

New features from Fortran 2018

  • Enhancements to the IMPLICIT statement allow specifying that all external procedures must declared EXTERNAL
  • Enhancements to the GENERIC statement permit it to be used to declare generic interfaces
  • The locality of variables may now be specified on a DO CONCURRENT statement
  • Enhancements to edit descriptor forms E, D, EN, ES, and G allow a field width of zero, analogous to the F edit descriptor
  • The exponent width e in a data edit descriptor may now be zero, analogous to a field width of zero
  • The RN edit descriptor now rounds to nearest as specified by Fortran 2018 and ISO/IEC/IEEE 60559:2011
  • The EX edit descriptor allows for hexadecimal format output of floating point values. Hexadecimal format floating point values are allowed on input.
  • SIZE= may be specified for non-advancing I/O
  • The values for SIZE= and POS= in an INQUIRE statement for pending asynchronous operations have been standardized
  • The value assigned to the RECL= specifier in an INQUIRE statement now has standardized values
  • A new form of the intrinsic function CMPLX does not require the KIND= keyword if the first argument is type COMPLEX
  • The arguments to the SIGN function may be of different kinds
  • INTEGER and LOGICAL arguments to intrinsic procedures are no longer required to be of default kind
  • The named constants STAT_FAILED_IMAGE and STAT_UNLOCKED_FAILED_IMAGE have been defined in the intrinsic
    ISO_FORTRAN_ENV module
  • The non-block DO statement and the arithmetic IF statement are now deleted in Fortran 2018. Intel® Fortran fully supports features deleted in the FORTRAN standard
  • COMMON, EQUIVALENCE and BLOCKDATA statements are now obsolescent
  • The labeled form of DO loops is now obsolescent
  • Locality of variables in DO CONCURRENT constructs can now be declared on the DO CONCURRENT statement
  • Specific names of intrinsic procedures are now obsolescent
  • FAIL IMAGE statement allows debugging recovery code for failed images without having to wait for an actual image failure
  • The named constants STAT_FAILED_IMAGE and STAT_UNLOCKED_FAILED_IMAGE have been defined in the intrinsic
    ISO_FORTRAN_ENV module
  • An optional argument STAT= has been added to ATOMIC_REF and ATOMIC_DEFINE intrinsic procedures
  • Optional STAT= and ERRMSG= specifiers have been added to the MOVE_ALLOC intrinsic procedure, to image selectors, and to the CRITICAL statement and construct
  • Atomic subroutines ATOMIC_ADD, ATOMIC_AND, ATOMIC_CAS, ATOMIC_FETCH_ADD, ATOMIC_FETCH_AND, ATOMIC_FETCH_OR, ATOMIC_FETCH_XOR, ATOMIC_OR, and ATOMIC_XOR have been implemented
  • Collective subroutines CO_BROADCAST, CO_MAX, CO_MIN, CO_REDUCE, and CO_SUM have been implemented
  • The SELECT RANK construct has been implemented allowing manipulation of assumed rank dummy arguments
  • The compiler will now diagnose the use of nonstandard intrinsic procedures and modules as required by Fortran 2018
  • Transformational intrinsic functions from the intrinsic modules ISO_C_BINDING, IEEE_ARITHMETIC, and IEEE_EXCEPTIONS are now allowed in specification expressions
  • You can now specify the optional argument RADIX for the IEEE_GET_ROUNDING_MODE and IEEE_SET_ROUNDING_MODE intrinsic module procedures
  • The optional ROUND argument has been added to the IEEE_RINT function in the intrinsic module IEEE_ARITHMETIC
  • The intrinsic module IEEE_ARITHMETIC now includes the functions IEEE_FMA, IEEE_SIGN_BIT, IEEE_NEXT_UP and IEEE_NEXT_DOWN
  • The intrinsic module procedures IEEE_MAX, IEEE_MIN, IEEE_MAX_MAG, and IEEE_MIN_MAG have been implemented
  • The intrinsic module procedures IEEE_INT and IEEE_REAL have been implemented
  • The intrinsic module IEEE_EXCEPTIONS now contains a new derived type, IEEE_MODES_TYPE, which can be used to save and restore the IEEE_MODES using the IEEE_GET_MODES and the IEEE_SET_MODES intrinsic module procedures
  • A new rounding mode, IEEE_AWAY has been added
  • SUBNORMAL is now synonymous with DENORMAL
  • IEEE_QUIET_EQ, IEEE_QUIET_NE, IEEE_QUIET_LT, IEEE_QUIET_LE, IEEE_QUIET_GT, IEEE_QUIET_GE, IEEE_SIGNALING_EQ, IEEE_SIGNALING_NE, IEEE_SIGNALING_GT, IEEE_SIGNALING_GE, IEEE_SIGNALING_LT, and IEEE_SIGNALING_LE intrinsic module procedures have been implemented

New Features From OpenMP 5.0*

  • IF clause on SIMD directive
  • NONTEMPORAL clause on SIMD directive
  • Inclusive/exclusive scan operations in SIMD and TARGET SIMD constructs.

Changed Compiler Behavior

  • Previous compiler versions erroneously permitted a PRIVATE or SEQUENCE statement to appear prior to the declaration of any type parameters in a derived type declaration. Intel® Fortran Compiler 19.1 no longer permits this behavior.
  • The INQUIRE statement now uses realpath() function with argument ’/’’GetFullPathNameA’ and uses the resulting canonicallized file-paths if the calls succeeds. An example of the change is:
    Open file as “bar/foo”.
    Before:
    Inquire whether “./bar/foo”, “bar//foo” or “bar/../bar/foo” is open – it is not.
    After:
    Inquire whether “./bar/foo”, “bar//foo” or “bar/../bar/foo” is open – it is.
  • In 19.0 compiler version, all procedures with the exception of C_F_POINTER from the intrinsic module ISO_C_BINDING were made PURE per the Fortran 2018 standard. Interpretation 18/007 declared that making C_F_PROCPOINTER PURE was a mistake. 19.1 complies with this interpretation and makes C_F_PROCPOINTER IMPURE.

Back to top

New and Changed Compiler Options

Please refer to the compiler documentation for details. Following new compiler options added:

For a list of deprecated compiler options, see the Compiler Options section of the documentation.

-assume [no]old_inquire_recl

Determines the value of the RECL= specifier on an INQUIRE statement for an unconnected unit or a unit connected for stream access.

-assume [no]old_ldout_zero

Determines the format of a floating-point zero produced by list-directed output. old_ldout_zero uses exponential format, no_old_ldout_zero uses fractional format.

-check [no]udio_iostat

Determines whether standard conformance checking occurs when user defined derived type input/output procedures are executed.

-warn [no]externals

Determines whether warnings occur for any dummy procedures or procedure calls that have on explicit interface or have not been declared EXTERNAL.

-m[no-]branches-within-32B-boundaries

This option is supported in versions 19.0 update 8 of the compiler and above. The details about this option can be found in the Intel® Fortran Compiler 19.1 Developer Guide and Reference. To find more information, see https://www.intel.com/content/dam/support/us/en/documents/processors/mitigations-jump-conditional-code-erratum.pdf

 

Back to top

Support Deprecated

The compiler option -stand f15 will be removed in next update. Use -stand f18 instead.

Support Removed

Loop Profiler

The Loop Profiler feature is removed in Intel® Fortran Compiler 19.1. The following compiler options related to Loop Profiler are removed: -profile-loops=keyword, -profile-loops-report=value -profile-functions, -guide-profile.

Installation on 32-bit hosts has been removed

Installation on 32-bit hosts was removed in Intel® Parallel Studio XE 2018 versions. Support for generating code for 32-bit targets is supported on 64-bit hosts (only) via compiler option -m32.

Intel® Xeon Phi™ x100 product family coprocessor (formerly code name Knights Corner) is not supported

The Intel® Xeon Phi™ x100 product family coprocessor (formerly code name Knights Corner) was officially announced end of life in January 2017. As part of the end of life process, the support for this family will only be available in the Intel® Parallel Studio XE 2017 version. Intel® Parallel Studio XE 2017 will be supported for a period of 3 years ending in January 2020 for the Intel® Xeon Phi™ x100 product family. Support will be provided for those customers with active support.

Back to top

Known Issues

Fortran Coarray Application Hang After Executing FAIL IMAGE

The current FAIL IMAGE implementation has a known issue that manifests after the FAIL IMAGE statement is executed. Please refer to the article for more details.

If you use a FAIL IMAGE statement to make an image fail, you should use a STAT= specifier or a STAT argument in all coarray operations that might encounter that failed image if the statement or operation permits, or you should specify either the assume failed_images or standard-semantics compiler option. If you do not use a STAT= specifier, a STAT argument, or specify one of the compiler options, those operations will not check for failed images. They may then try to coordinate with the failed image, waiting for a response from it. The response would never happen and so the application would hang.

The following example demonstrates using the STAT= specifier to prevent an application hang.

SUBROUTINE FAIL_AND_SYNC ( THIS_ONE )
   INTEGER THIS_ONE
   INTEGER MY_STAT
   IF (THIS_IMAGE() .EQ. THIS_ONE) THEN
       FAIL IMAGE
   END IF
   SYNC ALL (STAT=MY_STAT)      ! Would hang without STAT=
END SUBROUTINE FAIL_AND_SYNC

 

Using the Coarray Feature with Red Hat 8

Applications that use the coarray feature and are running on Red Hat 8.0 or later should have Intel MPI 2019 Update 7 or later installed.  With earlier versions of MPI, applications will not complete successfully and give little information about the failure.

 

Back to top

Fortran 2008 and Fortran 2018 Feature Summary

The Intel® Fortran Compiler supports full Fortran 2008 standard and most features from the Fortran 2018 standard. New Fortran 2018 features supported by the current version are listed in the 'New features from Fortran 2018' section.

Please refer to the Fortran 2008 Standard (PDF) and the Fortran 2018 Standard (PDF) if necessary.

Back to top

Disclaimer and Legal Information

Intel may make changes to specifications and product descriptions at any time, without notice. Designers must not rely on the absence or characteristics of any features or instructions marked "reserved" or "undefined." Intel reserves these for future definition and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to them. The information here is subject to change without notice. Do not finalize a design with this information.

INFORMATION IN THIS DOCUMENT IS PROVIDED IN CONNECTION WITH INTEL(R) PRODUCTS. NO LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS DOCUMENT. EXCEPT AS PROVIDED IN INTEL'S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, INTEL ASSUMES NO LIABILITY WHATSOEVER, AND INTEL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY, RELATING TO SALE AND/OR USE OF INTEL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS OTHERWISE AGREED IN WRITING BY INTEL, THE INTEL PRODUCTS ARE NOT DESIGNED NOR INTENDED FOR ANY APPLICATION IN WHICH THE FAILURE OF THE INTEL PRODUCT COULD CREATE A SITUATION WHERE PERSONAL INJURY OR DEATH MAY OCCUR.

The products described in this document may contain design defects or errors known as errata which may cause the product to deviate from published specifications. Current characterized errata are available on request.

Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.

Copies of documents which have an order number and are referenced in this document, or other Intel literature, may be obtained by calling 1-800-548-4725, or go to: http://www.intel.com/design/literature.htm

Intel processor numbers are not a measure of performance. Processor numbers differentiate features within each processor family, not across different processor families. Go to:

http://www.intel.com/products/processor%5Fnumber/

The Intel® Fortran Compiler is provided under Intel’s End User License Agreement (EULA).

Please consult the licenses included in the distribution for details.

Intel, the Intel logo, the Intel Inside logo, Xeon, and Intel Xeon Phi are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.

* Other names and brands may be claimed as the property of others.

© Intel Corporation. All Rights Reserved.

Back to top

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.