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Subject: [Bug tree-optimization/102494] Failure to optimize vector reduction
 properly especially when using OpenMP
Date: Fri, 08 Oct 2021 02:10:10 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102494

--- Comment #9 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:77ca2cfcdcccee3c8e8aeaf1d03e9920893d2486

commit r12-4241-g77ca2cfcdcccee3c8e8aeaf1d03e9920893d2486
Author: liuhongt <hongtao.liu@intel.com>
Date:   Tue Sep 28 12:55:10 2021 +0800

    Support reduc_{plus,smax,smin,umax,min}_scal_v4hi.

    gcc/ChangeLog:

            PR target/102494
            * config/i386/i386-expand.c (emit_reduc_half): Hanlde V4HImode.
            * config/i386/mmx.md (reduc_plus_scal_v4hi): New.
            (reduc_<code>_scal_v4hi): New.

    gcc/testsuite/ChangeLog:

            * gcc.target/i386/mmx-reduce-op-1.c: New test.
            * gcc.target/i386/mmx-reduce-op-2.c: New test.=