[Openmp-commits] [PATCH] D154172: [OpenMP] Added memory scope to atomic::inc API and used the device scope in reduction.

Dhruva Chakrabarti via Phabricator via Openmp-commits openmp-commits at lists.llvm.org
Thu Jun 29 17:43:01 PDT 2023

dhruvachak created this revision.
Herald added subscribers: sunshaoce, guansong, tpr, yaxunl.
Herald added a project: All.
dhruvachak requested review of this revision.
Herald added a reviewer: jdoerfert.
Herald added subscribers: openmp-commits, jplehr, sstefan1.
Herald added a project: OpenMP.

With https://reviews.llvm.org/D137524, memory scope and ordering
attributes are being used to generate the required instructions for
atomic inc/dec on AMDGPU. This patch adds the memory scope attribute to
the atomic::inc API and uses the device scope in reduction. Without
the device scope in atomic_inc, the default system scope leads to
unnecessary L2 write-backs/invalidates.

Additionally, for AMDGPU, the fence immediately before the atomic_inc in
the reduction code is no more necessary and has been removed.

  rG LLVM Github Monorepo



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