TheRock/compiler/amd-llvm/flang/docs/MeetingNotes/2026/2026-04-08.md

Combined Call 2026-04-08

Agenda

• Design docs and/or RFCs

  • [RFC] Helping the new contributors to create better contributions
    • No discussion at this time
  • [RFC] Support for More Than 15 Array Dimensions in Flang
    • It does not appear that there is a real-world use case for this functionality at this time that would justify the potential downsides.
  • [RFC] Alignment of global arrays
    • Related issue: [Flang] Bad alignment of globals in modules · Issue #189069
    • Related PR: https://github.com/llvm/llvm-project/pull/189709 (likely to be merged soon?)
    • Should there be a command-line flag for this? Could specify different alignments this way (ex. 32 or 64)
      • Should it be determined by the user providing an architecture flag?
      • We don’t want to set a default alignment that conflicts with the architecture
      • How to handle the case of conflicting command line args?
    • Consider library compatibility
  • [RFC] Flang lowering for OpenMP metadirective
    • No discussion at this time
  • [RFC] preserve logical operations in the IR for reductions
    • No discussion at this time
  • [RFC] Fortran 2023 ENUMERATION TYPEs
    • Related to Issue #183789
    • Had initial prototype, refactoring now after RFC discussion and PR feedback
    • PRs (~10) should start coming in later this week
  • Creating a new document "OpenMP-extensions"?
    • https://github.com/llvm/llvm-project/pull/186696#discussion_r2939508874
    • Has also been discussed in the OpenMP call, general consensus is to move forward with this
    • Will this include “not yet implemented” features?
  • [OpenMP] Misspelling of -Wopen-mp
    • PR: https://github.com/llvm/llvm-project/pull/188434
    • There do not seem to be objections, but what is the deprecation period?
      • 2 releases, is it enough? Yes
  • [RFC] Adding conditional expressions in Flang (F2023)
    • Has been split into two PRs
      • Parsing/Semantics: https://github.com/llvm/llvm-project/pull/186489 (has 4 approvals, needs merge)
      • Lowering: https://github.com/llvm/llvm-project/pull/186490 (has 2 approvals, awaiting 1 review)
    • Tests added to test suite: https://github.com/llvm/llvm-test-suite/pull/369
  • [Flang][Affine] Linearized array access in -promote-to-affine causes false dependence and blocks loop tiling
    • Several paths forward have been suggested, please comment on the post to help guide this new contributor
  • Changes to builtin modules
    • Community could help by commenting and highlighting how important this change is. Would relieve a lot of annoyance and this is holding up Flang community progress.
    • Initial PR has been merged. Additional PR: https://github.com/llvm/llvm-project/pull/171610
    • Main PR (from which the other two were extracted): https://github.com/llvm/llvm-project/pull/171515
    • Still needs some working with reviewers, will contact directly at EuroLLVM next week

• PRs of Note

  • Support for rank-1 integer array expressions in declarations (assumed-shape and explicit-shape) and allocate statements
    • Has been broken up, reviewers needed.
    • These should now be self-contained parser support PRs. Short design description is given in the GitHub Issue, https://github.com/llvm/llvm-project/issues/178071
      • https://github.com/llvm/llvm-project/pull/188445
      • https://github.com/llvm/llvm-project/pull/188446
      • https://github.com/llvm/llvm-project/pull/188447
    • PR related to pointer assignment coming
  • Document RFC best practices - PR #190836
  • [flang][OpenMP] Support user-defined declare reduction with derived types https://github.com/llvm/llvm-project/pull/190288 - could use AMDGPU code reviews
    • Michael Klemm asked to be tagged to review

• Issues of Note

  • None at this time

• FYI

  • LLVM 22.1.3 Released!

• Other topics as time allows

  • Next J3 meeting is scheduled for the week of June 15th in Coventry, UK
  • Best practice for PR that is dependent on someone else’s (unmerged) PR?
    • Could make it a part of a PR stack in some cases (LLVM user branches)
    • Otherwise, suggest making a draft PR and linking to the dependent one
  • Peter Klausler has retired. Thank you for all your hard work getting Flang started and ensuring it’s quality!!
    • Reviews that would normally have gone to him should be directed to either Eugene Epshteyn or Jean Perier
  • AMD and NVIDIA are hiring for Fortran compiler people

Details

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• To date, over 12,082 commits have been made to Flang