[Bug middle-end/109849] suboptimal code for vector walking loop

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109849

--- Comment #11 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:9e2017ae6ac788d3e36999bb0f0d20ea0f62c20e

commit r14-1127-g9e2017ae6ac788d3e36999bb0f0d20ea0f62c20e
Author: Richard Biener <rguenther@suse.de>
Date:   Thu May 18 13:52:29 2023 +0200

    tree-optimization/109849 - missed code hoisting

    The following fixes code hoisting to properly consider ANTIC_OUT instead
    of ANTIC_IN.  That's a bit expensive to re-compute but since we no
    longer iterate we're doing this only once per BB which should be
    acceptable.  This avoids missing hoistings to the end of blocks where
    something in the block clobbers the hoisted value.

            PR tree-optimization/109849
            * tree-ssa-pre.cc (do_hoist_insertion): Compute ANTIC_OUT
            and use that to determine what to hoist.

            * gcc.dg/tree-ssa/ssa-hoist-8.c: New testcase.