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Subject: [Bug target/109971] [14 regression] Several powerpc64 vector test
 cases fail after r14-1242-gf574e2dfae7905
Date: Fri, 02 Jun 2023 11:50:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109971

--- Comment #11 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Pan Li <panli@gcc.gnu.org>:

https://gcc.gnu.org/g:bffc52838e393a775e13dc48162669b0f43ebe09

commit r14-1493-gbffc52838e393a775e13dc48162669b0f43ebe09
Author: Ju-Zhe Zhong <juzhe.zhong@rivai.ai>
Date:   Thu Jun 1 12:36:17 2023 +0800

    VECT: Change flow of decrement IV

    Follow Richi's suggestion, I change current decrement IV flow from:

    do {
       remain -=3D MIN (vf, remain);
    } while (remain !=3D 0);

    into:

    do {
       old_remain =3D remain;
       len =3D MIN (vf, remain);
       remain -=3D vf;
    } while (old_remain >=3D vf);

    to enhance SCEV.

    Include fixes from kewen.

    This patch will need to wait for Kewen's test feedback.

    Testing on X86 is on-going

    Co-Authored by: Kewen Lin  <linkw@linux.ibm.com>

      PR tree-optimization/109971

    gcc/ChangeLog:

            * tree-vect-loop-manip.cc (vect_set_loop_controls_directly): Ch=
ange
decrement IV flow.
            (vect_set_loop_condition_partial_vectors): Ditto.=