[flang-dev] Flang Biweekly Sync - Notes from July 10, 2019 call
Gary Klimowicz via flang-dev
flang-dev at lists.llvm.org
Thu Jul 18 13:42:34 PDT 2019
Flang team,
Here are the notes from the July 10th, 2019 Flang biweekly call. Updates are in bold.
Please be sure to let us know if you have any questions and agenda topics for the next call.
The next Flang biweekly call will be July 24th, 2019 at 8:30 AM Pacific Time.
Thank you.
Gary Klimowicz
Agenda
* Continuous Integration at Arm
* Flang Community Technical Call – Overview of last call on MLIR
* Flang development update
* F18 development update
Highlights
* Continuous integration at Arm
* Leandro Nunes of Atm Ltd. presented an overview of the Arm continuous integration process. Slides are attached.
* Flang Community Technical Biweekly Call
* Hal Finkel is hosting this call on Bluejeans<https://bluejeans.com/625064848>, Wednesdays 8:30 Pacific Time, the weeks alternating with this call. Notes for these calls can be found in Google Docs here<https://docs.google.com/document/d/1Z2U5UAtJ-Dag5wlMaLaW1KRmNgENNAYynJqLW2j2AZQ/>.
* The July 3rd call was on MLIR use in Flang.
* The July 17th call had Arm will presenting a proposal for the new Flang driver program.
* The next call is scheduled for July 31st, 8:30 AM PDT. The scheduled agenda topic is the OpenMP.
* F18 as an LLVM project
* The LLVM-hosted flang-dev mailing list has been set up. Subscribe at https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev.
* We will continue to support the original flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org> through August 2019.
* The source code repository has not yet been set up in subversion, nor in the Monorepo.
* Plan is still to upload documentation for F18 before the code, to help establish the project goals and design strategy before uploading the code. This should help establish context for the project.
* F18 update
* Completed validation that specific procedures of a generic are distinguishable.
* Additional fixes for semantic issues identified by running internal test suites against f18.
* More work on intrinsic folding; implemented descriptor interface both front-end and runtime. These are no longer identical, as the complexity required for the run-time environment exceeds what is needed for a naïve implementation in the front-end. Implemented RESHAPE as a complex first step.
* More work on DO loop semantics and constraint checking.
* More work on OpenMP directive parsing and semantic checks: framework for structural checks for DO construct and integer expression-related checks.
* Flang Dev news and updates
* More bug fixes in queue to send to Flang.
Where we can use your help
* Subscribe to the new LLVM Flang email list: https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev.
* Please review the RFC regarding the compiler driver submitted to flang-dev. The thread can be found in the cfe-dev email list here<http://lists.llvm.org/pipermail/cfe-dev/2019-June/062669.html>.
* Please comment on the DEBUG metadata enhancement proposed for LLVM (CHARACTER intrinsic type). This is the last Flang debug metadata enhancement that has not been upstreamed to LLVM: https://reviews.llvm.org/D54114.
* Topics for the next call.
* If you would be interested in attending these biweekly calls, please let Gary Klimowicz know and he will send you an invitation to the WebEx meeting.
* Let us know if you have presentations or meetings relevant to the Flang community. We will publicize them in these notes.
Details
1. Flang on GitHub
· There have been 1,448 total commits (1,446 in the previous update).
· There are 466 people who have “starred” the flang repo and 66 forks.
· 170 people are following f18 in 22 forks. There have been 2,128 commits.
1. Flang Community Technical Call
* This 30-minute biweekly call is hosted by Hal Finkel at https://bluejeans.com/625064848.
* The call takes place on the Wednesdays on the weeks we do not have this call, at 8:30 AM Pacific time.
* Hal sent an invitation to flang-dev.
* Notes from the call can be found in this <https://docs.google.com/document/d/1Z2U5UAtJ-Dag5wlMaLaW1KRmNgENNAYynJqLW2j2AZQ/edit#heading=h.oiag5i748hyl> Google doc.
* The most recent call was held July 3rd, 8:30 AM Pacific time. We discussed the use of MLIR and post-AST transformations.
* The next call is scheduled for July 17th. The tentative agenda topic is the flang driver.
* Future Topics and tentative dates:
* LLVM transition (mailing lists, git/monorepo, etc.)
* OpenMP (2019-07-31)
* Aliasing information and LLVM enhancements (2019-08-14)
* Module files
1. Flang community
* Website: www.flang-compiler.org<http://www.flang-compiler.org> redirects to http://github.com/flang-compiler/flang.
* Wiki: https://github.com/flang-compiler/flang/wiki is the Flang wiki page where the most up-to-date build instructions and news can be found.
* Issues: Bug reports for Flang can be reported to https://github.com/flang-compiler/flang/issues.
* Mailing lists: There are three mailing lists for Flang: flang-dev, flang-sync and flang-announce at http://lists.flang-compiler.org/.
* You can reach the general Flang community by emailing flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org>.
* Occasional announcements are sent to flang-announce at lists.flang-compiler.org<mailto:flang-announce at lists.flang-compiler.org>.
* These notes will then be sent to flang-dev and flang-sync at lists.flang-compiler.org<mailto:flang-sync at lists.flang-compiler.org>. You should be able to subscribe and unsubscribe yourself from flang-sync and flang-dev as you desire.
* LLVM mailing lists: There are now two mailing lists hosted by llvm.org. We will be transitioning to using these lists:
* The flang-dev mailing list has been set up. Subscribe at https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev. These biweekly notes will now be sent to this email list.
* The flang-commits mailing list has been set up. Subscribe at https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-commits.
* Please migrate to the LLVM project mailing lists. We will be turning off the flang-dev at lists.flang-compiler.org<mailto:flang-dev at lists.flang-compiler.org> on September 1, 2019.
* Slack: flang-compiler.slack.com is used for informal real-time communication in the Flang community. Add yourself via the invite <https://join.slack.com/t/flang-compiler/shared_invite/enQtMjExOTEyMzQ3MjIxLTZkMDNlODc2YjgxZDY1NTQ2YWJiZWVhOGU2YWY0NDNiOWY0ZjQzNjYyZTNlZjBlNjgxY2U1ZjFjMmY5NzIwMzA> link.
1. What we’re up to
* F18 Fortran 2018 compiler
* On GitHub: The source code f18 is available on flang-compiler.github.com/f18<https://github.com/flang-compiler/f18/>. It’s recommended to start in the “documentation” directory.
* Status: We continue development on the new Fortran 2018 front-end. Recent work includes:
* Completed validation that specific procedures of a generic are distinguishable.
* Additional fixes for semantic issues identified by running internal test suites against f18.
* More work on intrinsic folding; implemented descriptor interface both front-end and runtime. These are no longer identical, as the complexity required for the run-time environment exceeds what is needed for a naïve implementation in the front-end. Implemented RESHAPE as a complex first step.
* More work on DO loop semantics and constraint checking.
* More work on OpenMP directive parsing and semantic checks: framework for structural checks for DO construct and integer expression-related checks.
* LLVM Project:
* The flang-dev email list has been set up on llvm.org. You can subscribe here: https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev. Archives are also available.
* The flang-commits email list has also been set up. There is no content yet, as we haven’t migrated to the LLVM monorepo.
* The plan is to first upload some of the top-level documentation so the community can read the project goals and strategy before we do a big code dump. This should happen mid-June.
* Recent updates to Flang:
Work has begun on the BLOCK construct.
* More PGI bug fixes
* F2008 feature: Allow multiple allocations with SOURCE= and MOLD=
* F2008 feature: Allow module procedure declarations to have more than 1 procedure name
* F2008 feature: Support BACK optional argument on MAXLOC and MINLOC
* Fix issue with parsing unlimited format items
* #653 flangrti: libnuma stubs exported by Flang runtime library
* Upcoming changes to Flang (in review):
* More PGI bug fixes
* F2008 support for G0 edit descriptor
* F2008 vector NORM2
* Pull request #695 – Remove duplicate files
* Pull request #716 – Make NCAR Kernels tests into longtests
* Assigned for work:
* #226 Unlimited polymorphic type does not work with transfer intrinsic
* #298 norm2 intrinsic
* #402 Compiler error on regular code
* #404 Internal compiler error with polymorphic subroutine parameters and nested derived types
* #426 Failures in #include of OpenMPI's mpif.h
* #461 OpenMP TeaLeaf_ref: local pointer variable not captured into parallel region
* #477 Pull request for module variable import debug test
* #498 Error while compiling libpgmath
* #512 Flang rejects polymorphic assignment
* #577 Procedure pointers to internal procedures
* #602 fd_sincos_scalar.cpp: "error: ‘__builtin_complex’ was not declared in this scope"
* #604 Flang errors out on a final subroutine with parameterized derived types
* #608 gdwarf-<version> flag is not honoured
* #610 No debug generated for namelists
* #662 Regression : Segfault in taskloop code
* Pull request #695 runtime: remove duplicate files
* Pull request #710 Test case for capturing procedure pointers to OpenMP parallel regions
* Pull request #719 libpgmath: windows and osx support
* Outstanding pull requests:
* #521 Add OpenBSD as a recognized OS (pending test on new OpenBSD systems internally)
* #529 runtime: PoC: generate call to LLVM intrinsic instead of calling runtime functions when possible; handling NINT for a beginning (proposed expansion of this pull request)
* #530 AArch64: disable test cases invalid on aarch64 (working on)
* #532 runtime: remove duplicate files (need to validate on all compilers)
* #546 Loosen ties to x86 (working on)
* #572 libpgmath: respect LIBPGMATH_WITH_GENERIC setting; fixes #559 (reviewing)
* #573 libpgmath: make it clang friendly; addresses bug #557 (reviewing)
* #592 add support for macOS (awaiting CLA)
* #622 Add explicit braces to avoid dangling else problem (failed NVIDIA testing)
* #642 AArch64: significantly improve formatted input performance by using optimized libc functions on ARM64
* #647 Introduce buffered I/O and replace getc with buffered read
* #655 Add missing signed integer to a pointer conversion in DATA statement
* #658 Fix in preprocessing for Flexi app
* #659 Changes to support transpose intrinsic during initialization
* #660 Enable support for simd directives
* #672 Support isnan() GNU extension (Arm reviewing)
* #689 Fix for segfault in multiple entries OpenMP functions
* #693 runtime: ARM64 is a 64-bit architecture
* #694 libpgmath sanity: do not call sleep() in Linux systems
* #695 runtime: remove duplicate files
* #701 Fix for ICE in taskloop
* #702 Fix for random_seed when seeds have zeroes in LSB
* #710 Test case for capturing procedure pointers to OpenMP parallel regions
* #711 Make the NCAR Kernels tests into longtests
* #717 Support building libpgmath with clang 6
* #719 libpgmath: windows and osx support
* #723 Support building flang with clang
* #725 Check for gregset_t before using it
* #726 Remove linux references where unneeded
* #737 TRAILZ function added to the fortran compiler (resubmitted)
* #738 Fix for issue #550
* #742 Implement UNROLL directive
* Public plan: NVIDIA has published a brief plan for upcoming Flang work on github.io at https://github.com/flang-compiler/flang/wiki/Roadmap. This has been recently updated to reflect current Flang and F18 priorities and to provide better context for the project and its long-term goals.
* Creating pull requests: NVIDIA requires contributor agreements from developers wishing to make pull requests. The Individual CLA is here: https://flang-compiler.github.io/files/Flang-ICLA-v4.pdf. The Corporate CLA is here: https://flang-compiler.github.io/files/Flang-CCLA-v2.pdf. Send completed CLAs to flang-cla at nvidia.com<mailto:flang-cla at nvidia.com>. Assuming the pull request builds and passes “make check-flang”, NVIDIA will take on the internal testing of the pull request using the full test suite available internally and provide feedback to the contributor as appropriate. Once we have the quality of the pull request established, it will be incorporated into Flang.
* LLVM is switching to a new Apache license with LLVM exceptions that we need to incorporate into our CLAs after it is adopted by LLVM community. The LLVM license can be found at http://llvm.org/foundation/relicensing/LICENSE.txt. A web page describing the relicensing effort can be found at http://llvm.org/foundation/relicensing/.
* OpenMP 4.5 support:
o OpenMP 4.5 is supported on multicore CPUs, mapping all target regions across all the cores, with the following known limitations:
* We map the directives directly for host==device with very predictable behavior and good performance results.
* Task depend/priority is not supported
* OMP do clauses linear, order(n), and schedule (modifier) are not supported
* SIMD construct, Declare SIMD, and SIMD clause: private/reduction/lastprivate/collapse clauses on SIMD construct are supported, SIMD clause/construct are used as a hint to vectorize through metadata generation
* There is a bug if target construct is enclosed by task construct
o No update
* Outstanding issues:
* Please refer to the Issues section on GitHub for flang-compiler/flang<https://github.com/flang-compiler/flang/issues> and flang-compiler/flang-driver<https://github.com/flang-compiler/clang/issues>.
* Debug Metadata:
* LLVM Debug metadata changes posted to LLVM Phabricator for review; responding to review comments.
* https://reviews.llvm.org/D54114 [CHARACTER intrinsic data type] Review for this is not complete, and we would like to get additional comments or alternate proposals.
* LLVM Debug metadata changes upstreamed to LLVM:
* https://reviews.llvm.org/D54043 [ELEMENTAL, PURE and RECURSIVE PROCEDURES]
* https://reviews.llvm.org/D54327 [COMMON blocks]
* Packaging and Binary Releases:
* Binary release: We post binary releases at least quarterly. March binary releases of Flang for x86-64 and OpenPOWER (LLVM 7.0) have been posted to http://github.com/flang-compiler/flang/releases.
* Spack: Spack packages for Flang have been reviewed by the Spack team and pulled into Spack for flang_20180921. We are still working through issues with defining the spack package for flang. Brian Homerding is starting to work on Spack changes for the LLVM and Flang for the LLVM Git monorepo.
* Testing updates:
* NCAR Kernels tests take a long time to execute on some architectures, so we are planning to move them to longtests, based on Arm pull request.
* Application updates:
* No update.
1. Fortran 2008 features
Some Fortran 2008 features in development for pgfortran will flow into Flang soon.
* Support for the G0 Edit descriptor has been requested by LLNL. Work is complete and is being upstreamed to Flang.
* BLOCK construct. Work has begun on BLOCK.
* Pointer default initialization. Work is scheduled to begin in shortly.
* Allocation of polymorphic variables. Work is scheduled to begin in shortly.
* EXECUTE_COMMAND_LINE intrinsic. Work is scheduled to begin in shortly.
* NORM2 intrinsic. Work has completed and is being upstreamed to Flang.
The following items are considered complete. Please report GitHub issues if you identify any problems.
* ERROR STOP
* Pointers to internal procedures
* SUBMODULE
* Serial implementation of F2018 DO CONCURRENT (there is no multi-core implementation planned at this time)
* BACK optional argument support for MINLOC/MAXLOC.
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