[Bug tree-optimization/105053] Wrong loop count for scalar code from vectorizer

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105053

--- Comment #6 from CVS 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:fe705dce2e1e3e4e5e0c69d7f9adaf7f2777cdc8

commit r12-7816-gfe705dce2e1e3e4e5e0c69d7f9adaf7f2777cdc8
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Mar 25 14:31:25 2022 +0100

    tree-optimization/105053 - fix reduction chain epilogue generation

    When we optimize permutations in a reduction chain we have to
    be careful to select the correct live-out stmt, otherwise the
    reduction result will be unused and the retained scalar code will
    execute only the number of vector iterations.

    2022-03-25  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/105053
            * tree-vect-loop.cc (vect_create_epilog_for_reduction): Pick
            the correct live-out stmt for a reduction chain.

            * g++.dg/vect/pr105053.cc: New testcase.