[Bug tree-optimization/102744] [12 regression] -O2 vectorization causes Wzero-length-array-bounds-2.c to fail on arc-elf

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102744

--- Comment #3 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by hongtao Liu <liuhongt@gcc.gnu.org>:

https://gcc.gnu.org/g:3c8d8c0be95e99dc0cba7f6fad2429243582119f

commit r12-4523-g3c8d8c0be95e99dc0cba7f6fad2429243582119f
Author: liuhongt <hongtao.liu@intel.com>
Date:   Thu Oct 14 09:31:03 2021 +0800

    Adjust testcase for O2 vectorization.

    As discussed in [1], this patch add xfail/target selector to those
    testcases, also make a copy of them so that they can be tested w/o
    vectorization.

    Newly added xfail/target selectors are used to check the vectorization
    capability of continuous byte/double bytes storage, these scenarios
    are exactly the part of the testcases that regressed after O2
    vectorization.

    [1] https://gcc.gnu.org/pipermail/gcc-patches/2021-October/581456.html.

    2021-10-19  Hongtao Liu  <hongtao.liu@intel.com>
                Kewen Lin  <linkw@linux.ibm.com>

    gcc/ChangeLog

            * doc/sourcebuild.texi (Effective-Target Keywords): Document
            vect_slp_v2qi_store, vect_slp_v4qi_store, vect_slp_v8qi_store,
            vect_slp_v16qi_store, vect_slp_v2hi_store,
            vect_slp_v4hi_store, vect_slp_v2si_store, vect_slp_v4si_store.

    gcc/testsuite/ChangeLog

            PR middle-end/102722
            PR middle-end/102697
            PR middle-end/102462
            PR middle-end/102706
            PR middle-end/102744
            * c-c++-common/Wstringop-overflow-2.c: Adjust testcase with new
            xfail/target selector.
            * gcc.dg/Warray-bounds-51.c: Ditto.
            * gcc.dg/Warray-parameter-3.c: Ditto.
            * gcc.dg/Wstringop-overflow-14.c: Ditto.
            * gcc.dg/Wstringop-overflow-21.c: Ditto.
            * gcc.dg/Wstringop-overflow-68.c: Ditto.
            * gcc.dg/Wstringop-overflow-76.c: Ditto.
            * gcc.dg/Warray-bounds-48.c: Ditto.
            * gcc.dg/Wzero-length-array-bounds-2.c: Ditto.
            * lib/target-supports.exp (check_vect_slp_aligned_store_usage):
            New function.
            (check_effective_target_vect_slp_v2qi_store): Ditto.
            (check_effective_target_vect_slp_v4qi_store): Ditto.
            (check_effective_target_vect_slp_v8qi_store): Ditto.
            (check_effective_target_vect_slp_v16qi_store): Ditto.
            (check_effective_target_vect_slp_v2hi_store): Ditto.
            (check_effective_target_vect_slp_v4hi_store): Ditto.
            (check_effective_target_vect_slp_v2si_store): Ditto.
            (check_effective_target_vect_slp_v4si_store): Ditto.
            * c-c++-common/Wstringop-overflow-2-novec.c: New test.
            * gcc.dg/Warray-bounds-51-novec.c: New test.
            * gcc.dg/Warray-bounds-48-novec.c: New test.
            * gcc.dg/Warray-parameter-3-novec.c: New test.
            * gcc.dg/Wstringop-overflow-14-novec.c: New test.
            * gcc.dg/Wstringop-overflow-21-novec.c: New test.
            * gcc.dg/Wstringop-overflow-76-novec.c: New test.
            * gcc.dg/Wzero-length-array-bounds-2-novec.c: New test.