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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libgomp/114690] New: OpenMP 'indirect' clause: dynamic image
 loading/unloading
Date: Thu, 11 Apr 2024 10:07:27 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libgomp
X-Bugzilla-Version: 14.0
X-Bugzilla-Keywords: openmp
X-Bugzilla-Severity: normal
X-Bugzilla-Who: tschwinge at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114690

            Bug ID: 114690
           Summary: OpenMP 'indirect' clause: dynamic image
                    loading/unloading
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: openmp
          Severity: normal
          Priority: P3
         Component: libgomp
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tschwinge at gcc dot gnu.org
                CC: burnus at gcc dot gnu.org, jakub at gcc dot gnu.org,
                    kcy at codesourcery dot com
  Target Milestone: ---

The OpenMP 'indirect' clause mapping table is not populated at image load t=
ime
(host-side), but upon the first device kernel invocation (device-side:
'build_indirect_map'), and is then immutable.

This is sufficient for a lot of cases, but breaks if additional images are
loaded after the first device kernel invocation (new mappings not added), o=
r if
images get unloaded (stale mappings not retired).

Reference:
<https://inbox.sourceware.org/875y25udf9.fsf@euler.schwinge.homeip.net>
"[PATCH] openmp: Add support for the 'indirect' clause in C/C++", "Also, fo=
r my
understanding: [...]" ff.=