[Bug tree-optimization/98526] [10 Regression] Double-counting of reduction cost

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98526

--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rgue...@gcc.gnu.org>:

https://gcc.gnu.org/g:4f0d8562af81709db39d7899993dd2bf98af28ec

commit r10-9406-g4f0d8562af81709db39d7899993dd2bf98af28ec
Author: Richard Biener <rguent...@suse.de>
Date:   Mon Jan 11 11:47:46 2021 +0100

    tree-optimization/98526 - fix vectorizer reduction cost

    This fixes a double-counting in the reduction cost when vectorizing
    the reduction through the regular vectorizable_* functions.

    2021-01-11  Richard Biener  <rguent...@suse.de>

            PR tree-optimization/98526
            * tree-vect-loop.c (vect_model_reduction_cost): Remove costing
            of the actual reduction op for the regular case.
            (vectorizable_reduction): Cost the stmts
            vect_transform_reduction produces here.

    (cherry picked from commit 04bff1bbfc11a974342c0eb0c0d65d902e36e82e)