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Subject: [Bug tree-optimization/97623] [9/10/11 Regression] Extremely slow O2
 compile (>>O(n^2))
Date: Tue, 03 Nov 2020 15:23:20 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97623

--- Comment #9 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:c5b49c3e092c0de5cd684b0acd244129dfaae324

commit r11-4675-gc5b49c3e092c0de5cd684b0acd244129dfaae324
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Nov 3 15:03:41 2020 +0100

    tree-optimization/97623 - limit PRE hoist insertion

    This limits insert iteration caused by PRE insertions generating
    hoist insertion opportunities and vice versa.  The patch limits
    the hoist insertion iterations to three by default.

    2020-11-03  Richard Biener  <rguenther@suse.de>

            PR tree-optimization/97623
            * params.opt (-param=3Dmax-pre-hoist-insert-iterations): New.
            * doc/invoke.texi (max-pre-hoist-insert-iterations): Document.
            * tree-ssa-pre.c (insert): Do at most
max-pre-hoist-insert-iterations
            hoist insert iterations.=