[Bug tree-optimization/107413] Perf loss ~14% on 519.lbm_r SPEC cpu2017 benchmark with r8-7132-gb5b33e113434be

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107413

--- Comment #12 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Wilco Dijkstra <wi...@gcc.gnu.org>:

https://gcc.gnu.org/g:0c1b0a23f1fe7db6a2e391b7cb78cff900377772

commit r13-4291-g0c1b0a23f1fe7db6a2e391b7cb78cff900377772
Author: Wilco Dijkstra <wilco.dijks...@arm.com>
Date:   Wed Nov 23 17:27:19 2022 +0000

    AArch64: Add fma_reassoc_width [PR107413]

    Add a reassocation width for FMA in per-CPU tuning structures. Keep
    the existing setting of 1 for cores with 2 FMA pipes (this disables
    reassociation), and use 4 for cores with 4 FMA pipes.  This improves
    SPECFP2017 on Neoverse V1 by ~1.5%.

    gcc/
            PR tree-optimization/107413
            * config/aarch64/aarch64.cc (struct tune_params): Add
            fma_reassoc_width to all CPU tuning structures.
            (aarch64_reassociation_width): Use fma_reassoc_width.
            * config/aarch64/aarch64-protos.h (struct tune_params): Add
            fma_reassoc_width.