[Openmp-dev] OpenMP in LLVM Multi-company Telecom Meeting Minutes Dec 18th

[Rokos, Georgios via Openmp-dev]

Next Meeting :  Jan 8th (Jan 1st is New Year's Day and on Jan 15th we have the F2F)

Opens:

   - None



Development Activity:

   - Francesco submitted a patch on IR vectorization of functions (https://reviews.llvm.org/D675720), but it had to be reverted. Will resubmit a revised version after the Christmas break.

   - Ongoing work on "declare variant" - enable use of overload-centric declare variants (https://reviews.llvm.org/D71241).

   - OpenMPOpt transformation pass (https://reviews.llvm.org/D69930) is under implementation. We need more people to help with OpenMP-specific optimizations.


Implementation of "declare variant":

   - Progress of https://reviews.llvm.org/D71241 is stuck due to opposing opinions on the implementation. More reviewers are needed to step in and help resolve the disagreement.



OpenMP-IR-Builder status:

   - The IR-Builder (https://reviews.llvm.org/D69785, https://reviews.llvm.org/D69922) and OpenMPConstants (https://reviews.llvm.org/D69853) patches have already landed.

   - Patches on lowering of "taskwait" (https://reviews.llvm.org/D69828) and "taskyield" (https://reviews.llvm.org/D70799) using the IR-Builder and codegen for the "parallel" construct (https://reviews.llvm.org/D70109) have been accepted but not committed yet.

   - Work on the "target" directive is currently in progress.

   - Johannes has started a spreadsheet with pending OpenMP-IR-Builder tasks to help coordinate who works on what. People should feel free to claim any tasks they want. Link: https://docs.google.com/spreadsheets/d/1FvHPuSkGbl4mQZRAwCIndvQx9dQboffiD-xD0oqxgU0/edit?usp=sharing



LLVM OpenMP community review etiquette:

   - There is a request for more community members to participate in the discussions around reviews of various patches because there is a feeling that currently only a handful of people get actively involved.


HIP/CUDA/OpenMP target compilation:

   - AMD proposed the idea of using a thread sanitizer with device RTLs by emulating runs of the RTLs on the host (because thread sanitizers cannot run on the device). Proposal was welcomed.


DeviceRTL redesign to support sharing code:

   - Jon has moved more code out of the nvptx RTL into the common library.

   - Implemented more functionality for the amdgcn target.

   - There is consensus on deprecating support for nvcc when building the nvptx device RTL. nvcc was the only robust solution when the library was initially written, but now clang can handle it just fine. This helps resolve a problem with compiler command-line options; clang, gcc and nvcc use the same options with different meanings. nvcc will not be dropped completely; instead a warning message will be emitted that compiling the nvptx RTL with nvcc has been deprecated and no support is provided.


Roll Call :


Company
Attendees
18-Dec
AMD



Greg Rodgers
x

Ashwin Aji

Jan Sjodin


Ron Lieberman
x

sameer Sahasrabuddhe


Jonathan Chesterfield
x

Andrey Kasaurov

ANL
Hal Finkel


Michael Kruse
x

Johannes Doerfert
x
ARM
Andrzej Warzynski
x

Francesco Petrogalli
x
IBM
Alexandre Eichenberger


Carlo Bertolli


Kelvin Li
x

Doru


Alexey Bataev
x
Intel
Andrey Churbanov
 x

Ravi Narayanaswamy

Serguei Dmitriev


Rajiv Deodhar


Lorri Menard


Terry Wilmarth


Rao, Prem


Hansang Bae


Xinmin Tian


Jeff Hammond

George Rokos
x
Cray
Deepak Eachempati

Micron
John Leidel

Nvidia
James Beyer

ORNL
Graham Lopez


Joel Denny
x

Geoffroy Vallee


Oscar Hernandez

SBU/BNL
Lingda Li


Jose Monlsave


Vivek Kale
 x

Martin Kong

TI
Eric Stotzer

U of Illinois
Hashim Sharif
LSU
Tianyi Zhang


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