[Bug tree-optimization/116573] [15 Regression] Recent SLP work appears to generate significantly worse code on RISC-V

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116573

--- Comment #12 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:5e3a4a01785e2d5135528a07bb8116af9c55ddf8

commit r15-3712-g5e3a4a01785e2d5135528a07bb8116af9c55ddf8
Author: Richard Biener <rguent...@suse.de>
Date:   Tue Sep 17 11:20:10 2024 +0200

    tree-optimization/116573 - .SELECT_VL for SLP

    The following restores the use of .SELECT_VL for testcases where it
    is safe to use even when using SLP.  I've for now restricted it
    to single-lane SLP plus optimistically allow store-lane nodes
    and assume single-lane roots are not widened but at most to
    load-lane who should be fine.

            PR tree-optimization/116573
            * tree-vect-loop.cc (vect_analyze_loop_2): Allow .SELECV_VL
            for SLP but disable it when there's multi-lane instances.
            * tree-vect-stmts.cc (vectorizable_store): Only compute the
            ptr increment when generating code.
            (vectorizable_load): Likewise.