[all-commits] [llvm/llvm-project] 4b9fab: [flang][OpenMP] Implement lastprivate with collaps...

[David Truby via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4b9fab591916eec9fd1942f37afe3b137b564089
      https://github.com/llvm/llvm-project/commit/4b9fab591916eec9fd1942f37afe3b137b564089
  Author: David Truby <david.truby at arm.com>
  Date:   2024-07-19 (Fri, 19 Jul 2024)

  Changed paths:
    M flang/lib/Lower/OpenMP/DataSharingProcessor.cpp
    M flang/lib/Lower/OpenMP/DataSharingProcessor.h
    M flang/lib/Lower/OpenMP/OpenMP.cpp
    A flang/test/Lower/OpenMP/parallel-wsloop-lastpriv.f90

  Log Message:
  -----------
  [flang][OpenMP] Implement lastprivate with collapse (#99500)

This patch enables the lastprivate clause to be used in the presence of
the collapse clause.

Note: the way we currently implement lastprivate means that this adds a
large number of compare instructions to the end of every iteration of
the loop. This is a clearly non-optimal thing to do, but lastprivate in
general will need re-implementing to prevent this. This is planned as
part of the delayed privatization work. This current implementation is
just a stop-gap measure as generating sub-optimal but working code is
better than crashing out.



To unsubscribe from these emails, change your notification settings at https://github.com/llvm/llvm-project/settings/notifications