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Subject: [Bug tree-optimization/97623] [9/10 Regression] Extremely slow O2
 compile (>>O(n^2))
Date: Mon, 11 Jan 2021 13:37:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97623

--- Comment #21 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-10 branch has been updated by Richard Biener
<rguenth@gcc.gnu.org>:

https://gcc.gnu.org/g:0fd6247a3014038af349db3a01748b5dc17d87a0

commit r10-9245-g0fd6247a3014038af349db3a01748b5dc17d87a0
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Oct 30 13:32:32 2020 +0100

    tree-optimization/97623 - avoid excessive insert iteration for hoisting

    This avoids requiring insert iteration for back-to-back hoisting
    opportunities as seen in the added testcase.  For the PR at hand
    this halves the number of insert iterations retaining only
    the hard to avoid PRE / hoist insert back-to-backs.

    2020-10-30  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/97623
            * tree-ssa-pre.c (insert): First do hoist insertion in
            a backward walk.

            * gcc.dg/tree-ssa/ssa-hoist-7.c: New testcase.

    (cherry picked from commit 82ff7e3426ea926d090777173977f8bedd086816)=