[Bug tree-optimization/122364] Missed reduction chain vectorization

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122364

--- Comment #1 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Richard Biener <rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:73b6879afdf8cbc58f1a89cc79bd69737f87913c

commit r16-4556-g73b6879afdf8cbc58f1a89cc79bd69737f87913c
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Oct 21 15:23:18 2025 +0200

    tree-optimization/122364 - reduction chain with conversion

    The following handles detecting of a reduction chain wrapped in a
    conversion.  This does not yet try to combine operands with different
    signedness, but we should now handle signed integer accumulation
    to both a signed and unsigned accumulator fine.

            PR tree-optimization/122364
            * tree-vect-slp.cc (vect_analyze_slp_reduc_chain): Re-try
            linearization on a conversion source.

            * gcc.dg/vect/vect-reduc-chain-5.c: New testcase.