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Subject: [Bug tree-optimization/102943] [12 Regression] Jump threader
 compile-time hog with 521.wrf_r
Date: Thu, 04 Nov 2021 14:40:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102943

--- Comment #16 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Aldy Hernandez <aldyh@gcc.gnu.org>:

https://gcc.gnu.org/g:e4411622690654cdc530c6262c7115a9e15dc359

commit r12-4904-ge4411622690654cdc530c6262c7115a9e15dc359
Author: Aldy Hernandez <aldyh@redhat.com>
Date:   Thu Nov 4 11:34:55 2021 +0100

    Avoid repeating calculations in threader.

    We already attempt to resolve the current path on entry to
    find_paths_to_name(), so there's no need to do so again for each
    exported range since nothing has changed.

    Removing this redundant calculation avoids 22% of calls into the path
    solver.

    Tested on x86-64 and ppc64le Linux with the usual regstrap.  I also
    verified that the before and after number of threads was the same
    in a suite of .ii files from a bootstrap.

    gcc/ChangeLog:

            PR tree-optimization/102943
            * tree-ssa-threadbackward.c (back_threader::find_paths_to_names=
):
            Avoid duplicate calculation of paths.=