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Subject: [Bug target/107344] GCC/nvptx SESE region optimization
Date: Fri, 21 Oct 2022 09:29:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107344

--- Comment #1 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Thomas Schwinge <tschwinge@gcc.gnu.or=
g>:

https://gcc.gnu.org/g:a9de836c2b22f878cff592b96e11c1b95d4d36ee

commit r13-3434-ga9de836c2b22f878cff592b96e11c1b95d4d36ee
Author: Thomas Schwinge <thomas@codesourcery.com>
Date:   Sun Oct 16 00:07:20 2022 +0200

    Restore 'libgomp.oacc-c-c++-common/nvptx-sese-1.c' SESE regions checking
[PR107195, PR107344]

    That is, adjust for optimization introduced with recent
    commit r13-3217-gc4d15dddf6b9eacb36f535807ad2ee364af46e04
    "[PR107195] Set range to zero when nonzero mask is 0", where GCC now
    understands that after 'r *=3D 2;', 'r & 1' will never hold here, and t=
hus
    transforms/optimizes/"disturbs" the original code such that GCC/nvptx's
later
    "Neuter whole SESE regions" optimization no longer is applicable to it:

        UNSUPPORTED: libgomp.oacc-c/../libgomp.oacc-c-c++-common/nvptx-sese=
-1.c
-DACC_DEVICE_TYPE_nvidia=3D1 -DACC_MEM_SHARED=3D0 -foffload=3Dnvptx-none  -=
O0
        PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/nvptx-sese-1.c
-DACC_DEVICE_TYPE_nvidia=3D1 -DACC_MEM_SHARED=3D0 -foffload=3Dnvptx-none  -=
O2  (test
for excess errors)
        PASS: libgomp.oacc-c/../libgomp.oacc-c-c++-common/nvptx-sese-1.c
-DACC_DEVICE_TYPE_nvidia=3D1 -DACC_MEM_SHARED=3D0 -foffload=3Dnvptx-none  -=
O2=20
execution test
        [-PASS:-]{+FAIL:+}
libgomp.oacc-c/../libgomp.oacc-c-c++-common/nvptx-sese-1.c
-DACC_DEVICE_TYPE_nvidia=3D1 -DACC_MEM_SHARED=3D0 -foffload=3Dnvptx-none  -=
O2=20=20
scan-nvptx-none-offload-rtl-dump mach "SESE regions:.*
[0-9]+{[0-9]+->[0-9]+(\\.[0-9]+)+}"

    Same for C++.

    It's unclear to me if this is an actual "problem", which optimization is
"more
    important", so I've filed PR107344 "GCC/nvptx SESE region optimization"=
 to
    capture this question, and here restore what we intend to be testing (t=
o my
    understanding) in 'libgomp.oacc-c-c++-common/nvptx-sese-1.c'.

            PR tree-optimization/107195
            PR target/107344
            libgomp/
            * testsuite/libgomp.oacc-c-c++-common/nvptx-sese-1.c: Restore S=
ESE
            regions checking.=