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* [Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable
@ 2022-03-12 12:58 tschwinge at gcc dot gnu.org
2022-03-12 14:51 ` [Bug middle-end/104892] " cvs-commit at gcc dot gnu.org
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: tschwinge at gcc dot gnu.org @ 2022-03-12 12:58 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104892
Bug ID: 104892
Summary: OpenACC 'kernels' decomposition: wrong-code cases
unless manually making certain variables addressable
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Keywords: openacc, wrong-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: tschwinge at gcc dot gnu.org
Reporter: tschwinge at gcc dot gnu.org
Target Milestone: ---
Even with the PR100280 etc. ICEs fixed, we still have the problem that we
generate wrong code in certain scenarios. For example, see the remark in
current 'libgomp.oacc-c-c++-common/kernels-decompose-1.c' that "Without making
'[...]' addressable, [...] we will not see the expected value copied out".
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/104892] OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable
2022-03-12 12:58 [Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable tschwinge at gcc dot gnu.org
@ 2022-03-12 14:51 ` cvs-commit at gcc dot gnu.org
2022-03-12 14:52 ` cvs-commit at gcc dot gnu.org
2022-03-12 15:04 ` tschwinge at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-03-12 14:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104892
--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.org>:
https://gcc.gnu.org/g:535afbd959bc72de85fca36ba6417f075cca1018
commit r12-7626-g535afbd959bc72de85fca36ba6417f075cca1018
Author: Thomas Schwinge <thomas@codesourcery.com>
Date: Fri Mar 11 15:11:25 2022 +0100
OpenACC 'kernels' decomposition: wrong-code cases unless manually making
certain variables addressable [PR104892]
Document a few examples of the status quo.
PR middle-end/104892
libgomp/
* testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c: Point
to PR104892.
* testsuite/libgomp.oacc-c-c++-common/default-1.c: Likewise,
enable '--param=openacc-kernels=decompose' and adjust.
* testsuite/libgomp.oacc-c-c++-common/kernels-reduction-1.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Likewise.
* testsuite/libgomp.oacc-fortran/kernels-reduction-1.f90:
Likewise.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/104892] OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable
2022-03-12 12:58 [Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable tschwinge at gcc dot gnu.org
2022-03-12 14:51 ` [Bug middle-end/104892] " cvs-commit at gcc dot gnu.org
@ 2022-03-12 14:52 ` cvs-commit at gcc dot gnu.org
2022-03-12 15:04 ` tschwinge at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: cvs-commit at gcc dot gnu.org @ 2022-03-12 14:52 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104892
--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.org>:
https://gcc.gnu.org/g:a07b8f4fb756484893b5612cbe9410970dc76db9
commit r12-7627-ga07b8f4fb756484893b5612cbe9410970dc76db9
Author: Thomas Schwinge <thomas@codesourcery.com>
Date: Fri Mar 11 22:31:51 2022 +0100
OpenACC 'kernels' decomposition: resolve wrong-code cases unless manually
making certain variables addressable [PR100280, PR104892]
Currently in OpenACC 'kernels' decomposition, there is special handling of
'GOMP_MAP_FORCE_TOFROM', documented to be done to avoid "internal compiler
errors in later passes". For performance reasons, the current repetitive
to/from device copying for every region is not ideal, compared to using
'present' clauses, as done for almost all other 'GOMP_MAP_*'. Also, the
current special handling (incomplete, evidently) is the reason for the
PR104892
misbehavior. For PR100280 etc. we've resolved all such known ICEs --
removing
the special handling for 'GOMP_MAP_FORCE_TOFROM' now resolves PR104892.
PR middle-end/100280
PR middle-end/104892
gcc/
* omp-oacc-kernels-decompose.cc (omp_oacc_kernels_decompose_1):
Remove special handling of 'GOMP_MAP_FORCE_TOFROM'.
gcc/testsuite/
* c-c++-common/goacc/kernels-decompose-2.c: Adjust.
* c-c++-common/goacc/kernels-decompose-pr100400-1-1.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr100400-1-2.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr100400-1-3.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr100400-1-4.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104061-1-1.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104061-1-2.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104061-1-3.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104061-1-4.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104132-1.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104133-1.c: Likewise.
* c-c++-common/goacc/kernels-decompose-pr104774-1.c: Likewise.
* gfortran.dg/goacc/classify-kernels.f95: Likewise.
* gfortran.dg/goacc/kernels-decompose-2.f95: Likewise.
libgomp/
* testsuite/libgomp.oacc-c-c++-common/declare-vla.c: Adjust.
* testsuite/libgomp.oacc-c-c++-common/default-1.c: Likewise.
* testsuite/libgomp.oacc-c-c++-common/kernels-decompose-1.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/kernels-reduction-1.c:
Likewise.
* testsuite/libgomp.oacc-c-c++-common/parallel-dims.c: Likewise.
* testsuite/libgomp.oacc-fortran/asyncwait-1.f90: Likewise.
* testsuite/libgomp.oacc-fortran/kernels-reduction-1.f90:
Likewise.
^ permalink raw reply [flat|nested] 4+ messages in thread
* [Bug middle-end/104892] OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable
2022-03-12 12:58 [Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable tschwinge at gcc dot gnu.org
2022-03-12 14:51 ` [Bug middle-end/104892] " cvs-commit at gcc dot gnu.org
2022-03-12 14:52 ` cvs-commit at gcc dot gnu.org
@ 2022-03-12 15:04 ` tschwinge at gcc dot gnu.org
2 siblings, 0 replies; 4+ messages in thread
From: tschwinge at gcc dot gnu.org @ 2022-03-12 15:04 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104892
Thomas Schwinge <tschwinge at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Thomas Schwinge <tschwinge at gcc dot gnu.org> ---
.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2022-03-12 12:58 [Bug middle-end/104892] New: OpenACC 'kernels' decomposition: wrong-code cases unless manually making certain variables addressable tschwinge at gcc dot gnu.org
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