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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/96932] [nvptx] atomic_exchange missing barrier
Date: Wed, 12 May 2021 11:30:09 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96932

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |burnus at gcc dot gnu.org

--- Comment #3 from Tobias Burnus <burnus at gcc dot gnu.org> ---
Crossref: PR100497 - fails on Volta without
  membar.sys;
before
  atom.global.exch.b32

Unfortunately, compared to pre-Volta, it is very slow - membar.gl is still =
slow
but a bit less.  Using (=E2=86=92 sm_70) fence.sys / fence.gnu instead of
fence.sc.{sys,gnu} (=3D membar.{sys,gl} on >=3D sm_70) does not seem to mak=
e a
performance difference for PR100497.=