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From: "tschwinge at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/90115] OpenACC: predetermined private levels for
 variables declared in blocks
Date: Thu, 15 Apr 2021 17:20:07 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90115

Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |90114

--- Comment #1 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
Very much related is privatization via the corresponding 'private' clauses,=
 at
the respective level.  (Thus not filing a new PR for that.)

OpenACC 3.1, 2.5.12 "private clause" (similar 2.5.13 "firstprivate clause")
states that on compute constructs, "The 'private' clause [...] declares tha=
t a
copy of each item on the list will be created for each gang", and OpenACC 3=
.1,
2.9.10 "private clause" states:

| The 'private' clause on a 'loop' construct specifies that a copy of each =
item
in var-list will be created. If the body of the loop is executed in
'vector-partitioned' mode, a copy of the item is created for each thread
associated with each vector lane. If the body of the loop is executed in
'worker-partitioned' 'vector-single' mode, a copy of the item is created for
and shared across the set of threads associated with all the vector lanes of
each worker. Otherwise, a copy of the item is created for and shared across=
 the
set of threads associated with all the vector lanes of all the workers of e=
ach
gang.


Also related is PR90114 "Predetermined private levels for variables declare=
d in
OpenACC accelerator routines".


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90114
[Bug 90114] Predetermined private levels for variables declared in OpenACC
accelerator routines=