[Bug tree-optimization/115843] [14/15 Regression] 531.deepsjeng_r fails to verify with -O3 -march=znver4 --param vect-partial-vector-usage=2

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115843

--- Comment #14 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:a177be05f6952c3f7e62186d2e138d96c475b81a

commit r15-2055-ga177be05f6952c3f7e62186d2e138d96c475b81a
Author: Richard Biener <rguenther@suse.de>
Date:   Mon Jul 15 13:50:58 2024 +0200

    tree-optimization/115843 - fix wrong-code with fully-masked loop and
peeling

    When AVX512 uses a fully masked loop and peeling we fail to create the
    correct initial loop mask when the mask is composed of multiple
    components in some cases.  The following fixes this by properly applying
    the bias for the component to the shift amount.

            PR tree-optimization/115843
            * tree-vect-loop-manip.cc
            (vect_set_loop_condition_partial_vectors_avx512): Properly
            bias the shift of the initial mask for alignment peeling.

            * gcc.dg/vect/pr115843.c: New testcase.