OpenMP patch ping

OpenMP patch ping

[Tobias Burnus]

I would like to ping the following OpenMP patches.

First two non-pings but just RFC:

- "Restore 'GOMP_offload_unregister_ver' functionality"
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/597918.html
   * QUESTION: See 'assert' question in email exchange
    (linked email message + emails before/after it in the thread)

- [Patch] OpenMP: Fix folding with simd's linear clause [PR106492]
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599308.html
   * Already committed as obvious to mainline + GCC 12
   * Question: Close PR or also backport to GCC 11? Other patch comments?


Now the patch pings – lightly ordered by complexity:

* [PATCH, OpenMP, C++] Allow classes with static members to be mappable
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598918.html
   * Modified as requested in the patch review

* [Patch] OpenMP: Fix var replacement with 'simd' and linear-step vars [PR106548]
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599832.html

* [Patch] Fortran: OpenMP fix declare simd inside modules and absent linear step [PR106566]
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599829.html

* [patch] libgomp/splay-tree.h: Fix splay_tree_prefix handling
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598694.html

* [Patch] OpenMP requires: Fix diagnostic filename corner case
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598697.html

* [PATCH] openmp: fix max_vf setting for amdgcn offloading
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598265.html

(Side note: we should at some point find a way to improve target-specific
handling; similar to the are-exceptions-supported issue of PR101544 but
there are more.)

* [PATCH] OpenMP, libgomp: Environment variable syntax extension.
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598770.html
   * Post-review Revised patch

* [Patch] OpenMP, libgomp, gimple: omp_get_max_teams, omp_set_num_teams, and omp_{gs}et_teams_thread_limit on offload devices
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599278.html
   * Revised patch; saw a light review before

* [Patch] OpenMP: Support reverse offload (middle end part)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598662.html
(Does permanent host fallback for target regions; I have a WIP patch
for AMDGCN and nvptx)

* [PATCH 0/3] OpenMP SIMD routines
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599487.html

* [PATCH 0/5] [gfortran] Support for allocate directive (OpenMP 5.0)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-January/588367.html
(already older - but I missed to ping it.)

* [PATCH 00/17] openmp, nvptx, amdgcn: 5.0 Memory Allocators
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/597976.html
   * Unified-Shared Memory & Pinned Memory

Depending on those:

* [PATCH] OpenMP, libgomp: Handle unified shared memory in omp_target_is_accessible.
   https://gcc.gnu.org/pipermail/gcc-patches/2022-May/594187.html

* [PATCH, OpenMP, Fortran] requires unified_shared_memory 1/2: adjust libgfortran memory allocators
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599703.html
   (Fortran part, required for ...)
* [PATCH, OpenMP, Fortran] requires unified_shared_memory 2/2: insert USM allocators into libgfortran
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599704.html

And finally:

* [PATCH, libgomp] Fix chunk_size<1 for dynamic schedule
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599332.html

Tobias

PS: I hope the list above and the one below is somewhat complete...

  * * *

PPS: Tracking patches pending (re)submissions, just that it is not
forgotten on our side:

* [PATCH, OpenMP, v4] Implement uses_allocators clause for target regions
   https://gcc.gnu.org/pipermail/gcc-patches/2022-June/596587.html
   * Needs to be revised according to review comments

* Fortran allocatable components handling (needs to be slit into separate pieces and submitted
   separately)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-April/593704.html

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
   https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586600.html
   and January + February updates (search for metadirective)
+ patch review end of May, e.g.
   https://gcc.gnu.org/pipermail/gcc-patches/2022-May/595762.html (+ 4 more emails)

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
   https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585439.html
   + [PATCH v2 00/11] OpenMP 5.0: C & C++ "declare mapper" support (plus struct rework, etc.)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-March/591973.html

* [PATCH 00/40] OpenACC "kernels" Improvements
   https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586901.html
   (4 simple patches are in by now; could be reviewed, in principle)

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Re: OpenMP patch ping

[Tobias Burnus]

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Follow-up patch ping (updated)

The first listed patches are smaller + should be quicker to be reviewable,
but in terms of priority, it would be good to make some progress on the
larger patches below as well. Especially as the first patches are only
mine ...

Smaller patches
(i) preparing for true reverse offload
  [Patches are rather independent + not complete for offloading.
   I have WIP patch for: finish mapping handling in target.c;
   follow-up to nvptx plugin patch (see there), GCN support
   (stack handling patch + reverse offload func).]
* [Patch][1/3] libgomp: Prepare for reverse offload fn lookup
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600333.html
* [Patch][2/3] GCN: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600340.html
* Re: [Patch][2/3][v2] nvptx: libgomp+mkoffload.cc: Prepare for reverse offload fn lookup
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600527.html
* [Patch] libgomp/nvptx: Prepare for reverse-offload callback handling
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600381.html
* [Patch] libgomp: Add reverse-offload splay tree
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600390.html

(ii) Other smaller patches:
* [Patch] OpenMP/Fortran: Permit end-clause on directive
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600433.html
* [Patch] libgomp.texi: Document libmemkind + nvptx/gcn specifics
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600494.html
* [wwwdocs] gcc-13/changes.html + projects/gomp/: OpenMP update
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/600864.html

(iii) And an RFC patch:
* [Patch] OpenMP: Document ompx warnings + add Fortran omx warning [PR106670]
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600490.html



Backlog:


On 16.08.22 19:28, Tobias Burnus wrote:

* [Patch] OpenMP, libgomp, gimple: omp_get_max_teams, omp_set_num_teams, and omp_{gs}et_teams_thread_limit on offload devices
  https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599278.html
[Depends on just-reviewed nearly ready by-device env patch.
Might see an update tomorrow/next days, once the env patch is revised again.]

* [PATCH 0/3] OpenMP SIMD routines

[Part 1/2 + 2/2 are in; still missing is 3/3]
"[PATCH 3/3] vect: inbranch SIMD clones"
https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599490.html


[PATCH 0/6] OpenMP 5.0: Fortran "<https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599490.html[PATCH0/6]OpenMP5.0:Fortran>declare mapper" support
https://gcc.gnu.org/pipermail/gcc-patches/2022-June/596036.html
Some review might make sense already; the final commit depends on:
"OpenMP 5.0: C & C++ "declare mapper" support (plus struct rework, etc.)"
which is currently being reworked (cf. links in "PPS"); the much revised
patch is now regression free but still needs to be cleaned up, split and
(re)submitted by Julian.



* [PATCH 0/5] [gfortran] Support for allocate directive (OpenMP 5.0)
  https://gcc.gnu.org/pipermail/gcc-patches/2022-January/588367.html
(already older - but I missed to ping it.)

* [PATCH 00/17] openmp, nvptx, amdgcn: 5.0 Memory Allocators
  https://gcc.gnu.org/pipermail/gcc-patches/2022-July/597976.html
  * Unified-Shared Memory & Pinned Memory

Depending on those:

* [PATCH] OpenMP, libgomp: Handle unified shared memory in omp_target_is_accessible.
  https://gcc.gnu.org/pipermail/gcc-patches/2022-May/594187.html

* [PATCH, OpenMP, Fortran] requires unified_shared_memory 1/2: adjust libgfortran memory allocators
  https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599703.html
  (Fortran part, required for ...)
* Re: [PATCH, OpenMP, Fortran] requires unified_shared_memory 2/2: insert USM allocators into libgfortran
  https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601059.html

And finally:

* [PATCH, libgomp] Fix chunk_size<1 for dynamic schedule
  https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599332.html
(Side remark: some other debugging support like showing the mapping being done as stderr output or ... would be nice as well; might depend on a libgomp-debug.so and/or -f...(sanitize=openmp or ...); the other open-source compiler has something similar.)
Tobias

PS: I hope the list above and the one below is somewhat complete...

 * * *

PPS: Tracking patches pending (re)submissions, just that it is not
forgotten on our side:
(revised)
* [PATCH] OpenMP, libgomp: Environment variable syntax extension.
  https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598770.html
Nearly ready – except for minor review comments.

* [PATCH] openmp: fix max_vf setting for amdgcn offloading
  https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598265.html
→ To be updated for review comments.
(Side note: we should at some point find a way to improve target-specific
handling; similar to the are-exceptions-supported issue of PR101544 but
there are more.)

* [OpenMP, nvptx] Use bar.sync/arrive for barriers when tasking is not used
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/600818.html
(back to drawing board)

* [PATCH, OpenMP, v4] Implement uses_allocators clause for target regions
  https://gcc.gnu.org/pipermail/gcc-patches/2022-June/596587.html
  * Needs to be revised according to review comments

* Fortran allocatable components handling (needs to be split into separate pieces and submitted
  separately)
  https://gcc.gnu.org/pipermail/gcc-patches/2022-April/593704.html

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
  https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586600.html
  and January + February updates (search for metadirective)
+ patch review end of May, e.g.
  https://gcc.gnu.org/pipermail/gcc-patches/2022-May/595762.html (+ 4 more emails)

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
  https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585439.html
  + [PATCH v2 00/11] OpenMP 5.0: C & C++ "declare mapper" support (plus struct rework, etc.)
  https://gcc.gnu.org/pipermail/gcc-patches/2022-March/591973.html

* [PATCH 00/40] OpenACC "kernels" Improvements
  https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586901.html
  (4 simple patches are in by now; could be reviewed, in principle)

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OpenMP Patch Ping

[Tobias Burnus]

Hi all, hello Jakub,

Below is the updated list to last ping,
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/607178.html

NOTE to the list below: I have stopped checking older patches. I know
some more are pending review, others need to be revised. I will re-check,
once the below listed patches have been reviewed. Cf. old list.

Thanks for the reviews done in between the last ping and now!

  * * *

Small patches
=============

* [Patch] Fortran: Extend align-clause checks of OpenMP's allocate clause
   https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608401.html
   Tue Dec 13 16:38:22 GMT 2022

* [Patch] OpenMP: Parse align clause in allocate directive in C/C++
   https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608404.html
   Tue Dec 13 17:44:27 GMT 2022

* Re: [Patch] libgomp.texi: Reverse-offload updates (was: [Patch] libgomp: Handle OpenMP's reverse offloads)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608245.html
   Thu Nov 24 12:01:04 GMT 2022

(Side note: wwwdocs also needs to be updated for the latter patch and
some other patches done in the meanwhile.)


Fortran allocat(e,ors) prep patch
=================================

* [Patch] Fortran/OpenMP: Add parsing support for allocators/allocate directive (was: [Patch] Fortran/OpenMP: Add parsing support for allocators directive)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-December/608904.html
   Wed Dec 21 15:51:25 GMT 2022

(Remark: While written from scratch, it is kind of a follow-up to Abid's patch
    [PATCH 1/5] [gfortran] Add parsing support for allocate directive (OpenMP 5.0)
you/Jakub reviewed on Tue Oct 11 12:13:14 GMT 2022, i.e.
  https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603258.html
- For the actual implementation of 'allocators', we still have to solve the issues
   raised in the review for '[PATCH 2/5] [gfortran] Translate allocate directive (OpenMP 5.0).'.
   at https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603279.html (and earlier in the thread);
   implementing 'omp allocate' (Fortran/C/C++) seems to be easier but no one has started implementing
   it so far - only parsing support exists.
- The USM patches on semi-USM system run into a similar issue as 'allocators' and for it, some
   ME omp_allocate is added.)


Mapping related patches
=======================
(Complex but GCC needs a revision badly as it fixing several bugs and missing functionality.)

* Complete patch set was just re-submitted by Julian, overiew patch is
   [PATCH v6 00/11] OpenMP: C/C++ lvalue parsing, C/C++/Fortran "declare mapper" support
   https://gcc.gnu.org/pipermail/gcc-patches/2022-December/thread.html#609031
   Fri Dec 23 12:12:53 GMT 2022
* Note: For 10/11 of the set, there was a follow up this Monday
   [PATCH v6 10/11] OpenMP: Support OpenMP 5.0 "declare mapper" directives for C
   https://gcc.gnu.org/pipermail/gcc-patches/2023-January/609566.html

[As it relates to one patch in the series:
   '[Patch] Fortran/OpenMP: Fix DT struct-component with 'alloc' and array descr'
That's mine, needs to be updated (WIP) and fixes array descriptor/alloc-string-length var
issues, where descriptor/string length may need to be handled explicitly on data entering map,
i.e. string lengths/allocator may require 'to:' instead of 'alloc:' - and on data exit mapping,
the current code might add a bogus 'alloc:'. - Idea is to handle this explicitly
in fortran/trans-openmp.cc instead of auto-adding it in the ME.
Status: WIP - removed in ME but not all cases are handled yet in FE.)


Fortran deep mapping (allocatable components)
====================
(Old patch of March 2022, but first part now properly but belated submitted - today):
[Patch][1/2] OpenMP: Add lang hooks + run-time filled map arrays for Fortran deep mapping of DT
https://gcc.gnu.org/pipermail/gcc-patches/2023-January/609637.html

Tobias

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OpenMP Patch Ping

[Tobias Burnus]

Updated list as follow up to last ping at https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601162.html


Recent patches:

Sandra's (Tue Nov 15 04:46:15 GMT 2022)
[PATCH v4] OpenMP: Generate SIMD clones for functions with "declare target"
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/606218.html


Julian's patches - I hope I got it right as I lost a bit track:

(Tue Nov 8 14:36:17 GMT 2022)
[PATCH v2 06/11] OpenMP: lvalue parsing for map clauses (C++)
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/605367.html

(Fri Sep 30 13:30:22 GMT 2022)
[PATCH v3 06/11] OpenMP: Pointers and member mappings
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/602609.html

(Tue Oct 18 10:39:01 GMT 2022)
[PATCH v5 0/4] OpenMP/OpenACC: Fortran array descriptor mappings
https://gcc.gnu.org/pipermail/gcc-patches/2022-October/thread.html#603790
(I think this is partially my task to review those.)


Approved but waiting for the Fortran patches (v5) to get approved.
[PATCH v3 08/11] OpenMP/OpenACC: Rework clause expansion and nested struct handling
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/602010.html


Possibly requiring a second look/review despite my initial comment
(which might require revisions on the patch side as well):
OpenMP: Duplicate checking for map clauses in Fortran (PR107214)
https://gcc.gnu.org/pipermail/gcc-patches/2022-October/604033.html


Older patches:

* [PATCH 00/17] openmp, nvptx, amdgcn: 5.0 Memory Allocators
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/597976.html
   * Unified-Shared Memory & Pinned Memory

Depending on those:

* [PATCH] OpenMP, libgomp: Handle unified shared memory in omp_target_is_accessible.
   https://gcc.gnu.org/pipermail/gcc-patches/2022-May/594187.html

* [PATCH, OpenMP, Fortran] requires unified_shared_memory 1/2: adjust libgfortran memory allocators
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599703.html
   (Fortran part, required for ...)
* Re: [PATCH, OpenMP, Fortran] requires unified_shared_memory 2/2: insert USM allocators into libgfortran
   https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601059.html

And finally:

* [PATCH, libgomp] Fix chunk_size<1 for dynamic schedule
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599332.html
(Side remark: some other debugging support like showing the mapping being done as stderr output or ... would be nice as well; might depend on a libgomp-debug.so and/or -f...(sanitize=openmp or ...); the other open-source compiler has something similar.)


  * * *


Pending libgomp/nvptx patches:

(Wed Sep 21 07:45:36 GMT 2022)
[PATCH, nvptx, 1/2] Reimplement libgomp barriers for nvptx
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601922.html

(Wed Sep 21 07:45:54 GMT 2022)
[PATCH, nvptx, 2/2] Reimplement libgomp barriers for nvptx: bar.red instruction support in GCC
https://gcc.gnu.org/pipermail/gcc-patches/2022-September/601925.html

Those were pinged 4 times :-(


Hopefully, I have not missed any patch

Tobias


PS: The following list covers pending patches, which have been reviewed but
but need to updated before being ready - hopefully, this list is also up to date:

* (No pending patch, but wwwdoc's changes-13.html + projects/gomp/ need an update before GCC 13)

* [Patch] OpenMP, libgomp, gimple: omp_get_max_teams, omp_set_num_teams, and
omp_{gs}et_teams_thread_limit on offload devices
Should be re-submitted any time soon (today, next few days)

* [Patch] OpenMP/Fortran: Permit end-clause on directive
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/600433.html
   Trivial patch modifications required - mostly LGTM already.

* [PATCH] libgomp: fix hang on fatal error
   https://gcc.gnu.org/pipermail/gcc-patches/2022-October/603616.html
(Patch rejected but alternative solutions were suggested.)

* Re: [Patch] OpenMP/Fortran: Use firstprivat not alloc for ptr attach for arrays
(Committed but failing occasionally:)
https://gcc.gnu.org/pipermail/gcc-patches/2022-November/605854.html

* "[PATCH 3/3] vect: inbranch SIMD clones"
   https://gcc.gnu.org/pipermail/gcc-patches/2022-August/599490.html
   Review comments to be addressed.

* [PATCH 0/5] [gfortran] Support for allocate directive (OpenMP 5.0)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-January/588367.html

* [PATCH] openmp: fix max_vf setting for amdgcn offloading
   https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598265.html
→ To be updated for review comments.
(Side note: we should at some point find a way to improve target-specific
handling; similar to the are-exceptions-supported issue of PR101544 but
there are more.)

* [PATCH, OpenMP, v4] Implement uses_allocators clause for target regions
   https://gcc.gnu.org/pipermail/gcc-patches/2022-June/596587.html
   * Needs to be revised according to review comments

* Fortran allocatable components handling (needs to be split into separate pieces and submitted
   separately)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-April/593704.html

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
   https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586600.html
   and January + February updates (search for metadirective)
+ patch review end of May, e.g.
   https://gcc.gnu.org/pipermail/gcc-patches/2022-May/595762.html  (+ 4 more emails)

* [PATCH 00/16] OpenMP: lvalues in "map" clauses and struct handling rework
   https://gcc.gnu.org/pipermail/gcc-patches/2021-November/585439.html
   + [PATCH v2 00/11] OpenMP 5.0: C & C++ "declare mapper" support (plus struct rework, etc.)
   https://gcc.gnu.org/pipermail/gcc-patches/2022-March/591973.html

* [PATCH 00/40] OpenACC "kernels" Improvements
   https://gcc.gnu.org/pipermail/gcc-patches/2021-December/586901.html
   (4 simple patches are in by now; could be reviewed, in principle)

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OpenMP patch ping

[Tobias Burnus]

OpenMP-related patch pings:

Kwok's:
* Re: [PATCH] openmp: Implicit 'declare target' for C++ static initializers
   https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559624.html
* RFC:
   Nested declare target support
   https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559758.html

Chung-Lin's:
* [PATCH v2, OpenMP 5, C++] Implement implicit mapping of this[:1] (PR92120)
   https://gcc.gnu.org/pipermail/gcc-patches/2020-November/558975.html

My:
* [Patch] OpenMP: C/C++ parse 'omp allocate'
   https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559930.html

If you have a comment to Julian's
* Re: [PATCH] nvptx: Cache stacks block for OpenMP kernel launch
   https://gcc.gnu.org/pipermail/gcc-patches/2020-November/559044.html

Tobias

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