[Bug tree-optimization/89007] [SVE] Implement generic vector average expansion

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89007

--- Comment #3 from GCC 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:765ef64246da4b65ca394b29095cbf891006977d

commit r17-3888-g765ef64246da4b65ca394b29095cbf891006977d
Author: liuhongt <hongtao.liu@intel.com>
Date:   Tue Sep 1 01:48:29 2026 -0700

    vect: Allow signed types in average fallback [PR89007]

    The average fallback is restricted to unsigned types, but it also works for
    signed types.  Arithmetic right shifts round down, and the low-bit carry
    adjusts the result in the same way.

    Remove the unsigned restriction.  Use target_supports_op_p rather than
    optab_for_tree_code to check whether the fallback operations are available.

    gcc/ChangeLog:

            PR tree-optimization/89007
            * tree-vect-patterns.cc (vect_recog_average_pattern): Allow signed
            types in the fallback.  Check whether the fallback operations are
            supported.

    gcc/testsuite/ChangeLog:

            PR tree-optimization/89007
            * gcc.target/i386/pr89007.c: New test.