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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/109849] suboptimal code for vector walking loop
Date: Wed, 24 May 2023 11:19:41 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109849

--- Comment #13 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:5476de2618ffb77f3a52e59e2c9f10b018329689

commit r14-1161-g5476de2618ffb77f3a52e59e2c9f10b018329689
Author: Richard Biener <rguenther@suse.de>
Date:   Wed May 24 12:36:28 2023 +0200

    tree-optimization/109849 - fix fallout of PRE hoisting change

    The PR109849 fix made us no longer hoist some memory loads because
    of the expression set intersection.  We can still avoid to compute
    the union by simply taking the first sets expressions and leave
    the pruning of expressions with values not suitable for hoisting
    to sorted_array_from_bitmap_set.

            PR tree-optimization/109849
            * tree-ssa-pre.cc (do_hoist_insertion): Do not intersect
            expressions but take the first sets.

            * gcc.dg/tree-ssa/ssa-hoist-9.c: New testcase.=