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Subject: [Bug tree-optimization/97623] [9/10/11 Regression] Extremely slow O2
 compile (>>O(n^2))
Date: Wed, 11 Nov 2020 11:51:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97623

--- Comment #17 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:bd87cc14ebdb6789e067fb1828d5808407c308b3

commit r11-4913-gbd87cc14ebdb6789e067fb1828d5808407c308b3
Author: Richard Biener <rguenther@suse.de>
Date:   Wed Nov 11 11:51:59 2020 +0100

    tree-optimization/97623 - Avoid PRE hoist insertion iteration

    The recent previous change in this area limited hoist insertion
    iteration via a param but the following is IMHO better since
    we are not really interested in PRE opportunities exposed by
    hoisting but only the other way around.  So this moves hoist
    insertion after PRE iteration finished and removes hoist
    insertion iteration alltogether.

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

            PR tree-optimization/97623
            * params.opt (-param=3Dmax-pre-hoist-insert-iterations): Remove
            again.
            * doc/invoke.texi (max-pre-hoist-insert-iterations): Likewise.
            * tree-ssa-pre.c (insert): Move hoist insertion after PRE
            insertion iteration and do not iterate it.

            * gcc.dg/tree-ssa/ssa-hoist-3.c: Adjust.
            * gcc.dg/tree-ssa/ssa-hoist-7.c: Likewise.
            * gcc.dg/tree-ssa/ssa-pre-30.c: Likewise.=