[flang-dev] Flang Biweekly Sync - Notes from the August 5, 2020 call
Gary Klimowicz via flang-dev
flang-dev at lists.llvm.org
Thu Aug 6 16:09:48 PDT 2020
Flang team,
Here are the notes from the August 5, 2020 Flang Community biweekly call.
Let me know if you have any topics you would like covered in the next call.
Upcoming calls (all times Pacific time):
Call
When
Flang Technical Community call
Monday, August 10, 8:30 AM
LLVM Alias Analysis call
Tuesday, August 11, 2020 at 10:00 AM
Classic Flang biweekly call
Wednesday, August 12, 2020 at 8:30 AM
OpenMP developer call
Thursday, August 13, 2020 at 8:00 AM
Flang biweekly call (this call)
Wednesday, August 19, 2020 at 8:30 AM
Information for joining these calls and the Flang Slack workspace is at the end of this email.
Thank you.
Gary
Agenda
* LLVM Flang Technical Call agenda
* LLVM Flang development update
* Classic Flang update
Highlights
* Flang Community Technical Biweekly Call
* Next call: August 10: Prototype use of MLIR affine dialect for Fortran array lowering. Out-of-tree flang builds.
* The last call was July 27. Updates from email threads on flang-dev mail list: FileCheck. Compile time and space for Flang.
* Please add both small and large technical topics to the Google Doc for the technical call. The link to the Google Doc can be found in the notes below.
* The separate call on alias analysis was July 14th. The next alias analysis call (every 4 weeks) is scheduled for August 11th. Nothing concrete scheduled on the agenda.
* LLVM Flang updates
* No update on the NERSC buildbot. Argonne National Lab continues to work with their IT and Administration to set up theirs. IBM is working on adding OpenPOWER build-bots.
* Andzrej Warzynski and Carol Concatto continue to work on the flang driver: Andrej sent out RFCs for the flang driver; please comment on these.
* Continued bug fixing related to running Fortran 77 programs as identified by FCVS and other testing.
* Made the preprocessor tests runnable.
* Began lowering of internal procedures; required change to treatment of some host-associated variables.
* Finished implementation of INQUIRE.
* Continued work on OpenACC; looking for reviews for outstanding patches.
* Continued work on OpenMP including additions to parallel clause and OpenMPIR, including lowering to OpenMPIR.
* Additional changes to the "throwaway" driver.
* Additional type constraint checks.
* Andrej sent out RFC for the flang driver; please comment on these.
* Michael Kruse sent out data on compile times for flang (up to 8 GB space to compile a single file). Is there interest in upstreaming patches to support MSVC++? Suggested to submit 1 at a time for review.
* Original Flang Dev news and updates
* Merged PR#900<https://github.com/flang-compiler/flang/pull/900>: Basic testing infra for debug-info testing.
* Reviewing PR#886<https://github.com/flang-compiler/flang/pull/886>: Replaced deprecated function stime which is removed in glibc 2.31.
* Reviewing PR#573<https://github.com/flang-compiler/flang/pull/573>: libpgmath: make it clang friendly; addresses bug #557.
* Discussions of pull requests happen on flang-compiler.slack.com #classic-flang-pull-requests.
Details (Updates below are in bold)
1. Flang on GitHub
* LLVM Flang is in https://github.com/llvm/llvm-project/tree/master/flang.
* There have been 2556 commits for LLVM Flang encompassing over 159,000 lines of code, documentation, CMakefiles and tests.
* There have been 1,678 total commits to Classic Flang in github.com/flang-compiler/flang.
* There are 539 people who have "starred" the Classic Flang repo and 80 forks.
1. Flang Community Technical Call (Hosted by Hal Finkel)
* The last call was July 27. Updates from email threads on flang-dev mail list: FileCheck. Compile time and space for Flang. When prompted for it, there was no further discussion on Complex lowering.
* The next technical community call will be Monday, August 10, 8:30 AM PT.
* Prototype use of MLIR affine dialect for Fortran array lowering.
* Out-of-tree flang builds.
* Future Topics and tentative dates:
* Bug 46931 - flang fails to build in 11.0-rc1 if documentation is enabled.
* OpenACC 3.0 support for flang (August 24).
* Build times for the compiler.
* Please feel free to add agenda topics to the Google Doc: https://docs.google.com/document/d/1Z2U5UAtJ-Dag5wlMaLaW1KRmNgENNAYynJqLW2j2AZQ/.
1. The LLVM alias analysis call was held Tuesday, July 14th 10:00 AM Pacific time. https://bluejeans.com/101176001?src=join_info.
* The agenda document is at https://docs.google.com/document/d/1ybwEKDVtIbhIhK50qYtwKsL50K-NvB6LfuBsfepBZ9Y.
* Full restrict patch (observation and clarification; issues encountered)
* Speed up in intersection code - O(n log(n))
* Calling Verifier after LoopVectorize pass?
* The next alias analysis call is scheduled for Tuesday, August 11. No specific agenda items yet.
1. OpenMP Technical Call
* We started a developer call in May to coordinate the OpenMP work.
* The call is held every Thursday at 8 am PDT/4 pm BST/8.30 pm IST.
* The primary agenda item of the call is a development update from the engineers involved.
* Participants include AMD, Arm, the US National Labs and BSC.
* Kiran Kumar (email in CC) from AMD hosts the call. Please let him know if you plan to join and need an invite.
* Call logistics are at the end of this email.
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:
* Issues for LLVM flang should be reported in Bugzilla: https://bugs.llvm.org/. Use the "flang" tag for flang-related issues, please.
* Issues for Classic Flang can be reported to https://github.com/flang-compiler/flang/issues.
* LLVM mailing lists: There are now two mailing lists hosted by llvm.org:
* The flang-dev mailing list has been set up. Subscribe at https://lists.llvm.org/cgi-bin/mailman/listinfo/flang-dev. These biweekly notes are now 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.
* Slack: The flang-compiler.slack.com workspace is used for informal real-time communication in the Flang community. The invitation link can be found at the end of this email.
1. What we're up to with the llvm-project/flang Fortran 2018 compiler
* On GitHub: The source code LLVM Flang is available on https://github.com/llvm/llvm-project/tree/master/flang. It's recommended to start in the "documentation" directory.
* Public plan: The team maintains a plan for upcoming Flang work at https://github.com/orgs/flang-compiler/projects/. This reflects current LLVM Flang priorities and context for the project and its long-term goals. (OpenMP work for flang, clang ad OpenMPIR is tracked separately.)
* Status: We continue development. Recent work includes:
* Arm buildbots are set up at http://lab.llvm.org:8011/builders/flang-aarch64-ubuntu (GCC 9.3) and http://lab.llvm.org:8011/builders/flang-aarch64-ubuntu-clang (Clang 8).
* NERSC buildbot is running in their staging area; Brian Friesen is working through an issue with Clang build. Argonne is making progress with the administration folk, who are trying to help get the build-bots set up. The platform is likely to be Intel Knights Landing.
* IBM is setting up a buildbot (ppc64le-flang+mlir-rhel-test) for Flang + MLIR on Power + RHEL. The phabricator patch is available at https://reviews.llvm.org/D84956.
* NVIDIA has hardware now for a buildbot.
* Discussions continue on alias analysis in LLVM. Notes from the last call are available at https://docs.google.com/document/d/1ybwEKDVtIbhIhK50qYtwKsL50K-NvB6LfuBsfepBZ9Y/. The next call is August 11.
* Andzrej Warzynski and Carol Concatto continue to work on the flang driver:
* Andrej sent out RFCs for the flang driver; please comment on these
* Continued implementation and bug fixing for running Fortran 77 programs as identified by FCVS and other testing:
* Runtime APIs for COMPLEX floating-point output
* BOZ literal constants with relational operators
* Result conversion and implicit declarations for statement functions
* INTRINSIC in type declarations statement
* Updates to RESHAPE, CMPLX folding
* Next input record handling
* The preprocessor tests are now runnable.
* Began lowering of internal procedures; required addition of symbols for host-associated variable references.
* Finished implementation of INQUIRE.
* Continued work on OpenACC
* OpenACC construct lowering skeleton
* Valentin Clements is looking for reviews for his outstanding patches. NVIDIA has an engineer who is reviewing
* Basic name resolution
* Continued work on OpenMP including
* Additions to parallel clause and OpenMPIR
* Lowering to OpenMPIR (taskyield, parallel)
* Extract name resolution for OpenACC and OpenMP into a separate file (for compilation time)
* Additional changes to the "throwaway" driver
* Pass flags to change default integer kind
* Change in order of libraries and object files
* Add -h as synonym for help
* Additional type constraint checks (C781, C7107-C7115)
* Michael Kruse sent out data on compile times for flang (up to 8 GB space to compile a single file). Is there interest in upstreaming patches to support MSVC++? Suggested to submit 1 at a time for review.
1. What we're up to with current Flang
* We sent an RFC to flang-dev on the handling of pull requests for merge into Flang. The flang wiki will be updated this week with the new process.
* We use the flang-compiler.slack.com channel #classic-flang-pull-requests to coordinate what pull requests we are working on.
* Recent fixes pushed to Flang master
* #875<https://github.com/flang-compiler/flang/pull/875> Spelling fixes (a simple change)
* #900<https://github.com/flang-compiler/flang/pull/900>: Basic testing infra for debug-info testing.
* Reviewing PR#886<https://github.com/flang-compiler/flang/pull/886>: Replaced deprecated function stime which is removed in glibc 2.31.
* Reviewing PR#573<https://github.com/flang-compiler/flang/pull/573>: libpgmath: make it clang friendly; addresses bug #557.
* Outstanding pull requests: https://github.com/flang-compiler/flang/pulls for the current list of pull requests.
* 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>.
* OpenMP 4.5 support:
o No update. OpenMP effort is now directed toward LLVM Flang.
* Debug Metadata:
* The outstanding review at https://reviews.llvm.org/D54114 [CHARACTER intrinsic data type] is stale and has been canceled. It will be replaced when there is an appropriate update for LLVM Flang.
* Packaging and Binary Releases:
* Spack: Spack packages for Flang have been updated. There is also a spack package for f18, based on the flang-compiler/f18 repository.
* Current Flang Fortran 2008 features
Current status of Fortran 2008 features can be found at https://github.com/flang-compiler/flang/wiki/Fortran-2008.
1. Logistics
Flang Community Biweekly Call (this call)
* General updates on the Flang project, both LLVM Flang and current Flang.
* Biweekly WebEx hosted by NVIDIA (which these notes cover).
* The meeting link for this biweekly call is https://nvmeet.webex.com/nvmeet/j.php?MTID=mb4edb8c799f69ec2dc0554acc969a162.
Flang Community Technical Biweekly Call
* Technical topics call.
* Hal Finkel hosts this call on Bluejeans<https://bluejeans.com/625064848>, Mondays 8:30 Pacific Time, on the weeks alternating with regular Flang biweekly call. The notes for all these calls can be found in Google Docs here<https://docs.google.com/document/d/1Z2U5UAtJ-Dag5wlMaLaW1KRmNgENNAYynJqLW2j2AZQ/>.
Meeting URL: https://bluejeans.com/625064848?src=join_info
Meeting ID: 625 064 848
Want to dial in from a phone? Dial one of the following numbers:
+1.408.317.9254 (US (San Jose))
+1.866.226.4650 (US Toll Free)
(see all numbers - https://www.bluejeans.com/premium-numbers)
Enter the meeting ID and passcode followed by #
Connecting from a room system?
Dial: bjn.vc or 199.48.152.152 and enter your meeting ID & passcode
Classic Flang Biweekly Technical Call
* For people working with the original Flang project.
* The call is held every other Wednesday in the same week as the LLVM Flang Technical call (alternate week with the Flang Community Biweekly call).
The agenda is available here: https://docs.google.com/document/d/1-OuiKx4d7O6eLEJDBDKSRnSiUO2rgRR-c2Ga4AkrzOI.
Join the Microsoft Teams Meeting at https://teams.microsoft.com/l/meetup-join/19%3ameeting_YjM5YjlmNGEtMjA0MS00MTRlLTg5ZjUtOTM1ZGIxOTU2NWQy%40thread.v2<https://teams.microsoft.com/l/meetup-join/19%3ameeting_YjM5YjlmNGEtMjA0MS00MTRlLTg5ZjUtOTM1ZGIxOTU2NWQy%40thread.v2/0?context=%7b%22Tid%22%3a%22f34e5979-57d9-4aaa-ad4d-b122a662184d%22%2c%22Oid%22%3a%223641875c-ef5b-4767-8105-0787a195852f%22%7d>
+442033215213 (Toll)
Conference ID: 349 328 047#
Local numbers <https://dialin.teams.microsoft.com/7bdb65cd-97d0-44fe-bc03-bf8072eadc33?id=349328047>
Join with a video conferencing device
784150312 at t.plcm.vc<mailto:784150312 at t.plcm.vc> VTC Conference ID: 1220440737
LLVM Alias Analysis Technical Call
* For people working on improvements to LLVM alias analysis.
* Hal Finkel hosts this call on Bluejeans<https://bluejeans.com/101176001>, Tuesdays 10:00 AM Pacific Time, every 4 weeks. The notes for all these calls can be found in Google Docs here<https://docs.google.com/document/d/1ybwEKDVtIbhIhK50qYtwKsL50K-NvB6LfuBsfepBZ9Y/>.
Meeting URL: https://bluejeans.com/101176001?src=join_info
Meeting ID: 101 176 001
Want to dial in from a phone? Dial one of the following numbers:
+1.312.216.0325 (US (Chicago))
+1.408.740.7256 (US (San Jose))
+1.866.226.4650 (US Toll Free)
(see all numbers - https://www.bluejeans.com/premium-numbers)
Enter the meeting ID and passcode followed by #
Connecting from a room system?
Dial: bjn.vc or 199.48.152.152 and enter your meeting ID & passcode
OpenMP Technical Call
* Kiran Kumar T P (KiranKumar.TP at amd.com) from AMD hosts this weekly call on Microsoft Teams, Thursdays 8:00 AM Pacific time.
* Please let Kiran know if you plan to join and need an invite.
* Call logistics:
o Teams Call Link: https://bit.ly/39eQW3o
o Minutes: https://docs.google.com/document/d/1yA-MeJf6RYY-ZXpdol0t7YoDoqtwAyBhFLr5thu5pFI
o Project Management: https://docs.google.com/spreadsheets/d/1FvHPuSkGbl4mQZRAwCIndvQx9dQboffiD-xD0oqxgU0/<https://docs.google.com/spreadsheets/d/1FvHPuSkGbl4mQZRAwCIndvQx9dQboffiD-xD0oqxgU0/edit#gid=0>
Flang Slack Workspace
* There is a Slack workspace dedicated to Flang, flang-compiler.slack.com.
* There are a number of topic-oriented channels available (e.g., #driver, #f18-semantics, #fir).
* Add yourself via the invitation link https://join.slack.com/t/flang-compiler/shared_invite/zt-2pcn51lh-VrRQL_YUOkxA_1CEfMGQhw
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