[Bug target/109971] [14 regression] Several powerpc64 vector test cases fail after r14-1242-gf574e2dfae7905

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109971

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

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

commit r14-1493-gbffc52838e393a775e13dc48162669b0f43ebe09
Author: Ju-Zhe Zhong <juzhe.zh...@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 -= MIN (vf, remain);
    } while (remain != 0);

    into:

    do {
       old_remain = remain;
       len = MIN (vf, remain);
       remain -= vf;
    } while (old_remain >= 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  <li...@linux.ibm.com>

      PR tree-optimization/109971

    gcc/ChangeLog:

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