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Subject: [Bug tree-optimization/114485] [13 Regression] Wrong code with -O3
 -march=rv64gcv on riscv or `-O3 -march=armv9-a` for aarch64
Date: Fri, 03 May 2024 13:55:05 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114485

--- Comment #14 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:a676581ddc49a6ead8edced7bb4b92aeceebde56

commit r13-8679-ga676581ddc49a6ead8edced7bb4b92aeceebde56
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Apr 4 10:00:51 2024 +0200

    tree-optimization/114485 - neg induction with partial vectors

    We can't use vect_update_ivs_after_vectorizer for partial vectors,
    the following fixes vect_can_peel_nonlinear_iv_p accordingly.

            PR tree-optimization/114485
            * tree-vect-loop-manip.cc (vect_can_peel_nonlinear_iv_p):
            vect_step_op_neg isn't OK for partial vectors but only
            for unknown niter.

            * gcc.dg/vect/pr114485.c: New testcase.

    (cherry picked from commit 85621f98d245004a6c9787dde21e0acc17ab2c50)=