[Bug target/119298] [15 Regression] 538.imagick_r is faster when compiled with GCC 14.2 and -Ofast -flto -march=native than with master on Zen5 since r15-3441-g4292297a0f938f

[cvs-commit at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119298

--- Comment #19 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jan Hubicka <hubi...@gcc.gnu.org>:

https://gcc.gnu.org/g:e2011ab13de3e70774f869b356f5f9c750780b34

commit r15-9495-ge2011ab13de3e70774f869b356f5f9c750780b34
Author: Jan Hubicka <hubi...@ucw.cz>
Date:   Tue Apr 15 19:04:15 2025 +0200

    Set ADDSS cost to 3 for znver5

    Znver5 has latency of addss 2 in typical case while all earlier versions
has latency 3.
    Unforunately addss cost is used to cost many other SSE instructions than
just addss and
    setting the cost to 2 makes us to vectorize 4 64bit stores into one 256bit
store which
    in turn regesses imagemagick.

    This patch sets the cost back to 3.  Next stage1 we can untie addss from
the other operatoins
    and set it correctly.

    bootstrapped/regtested x86_64-linux and also benchmarked on SPEC2k17

    gcc/ChangeLog:

            PR target/119298
            * config/i386/x86-tune-costs.h (znver5_cost): Set ADDSS cost to 3.