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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/26854] Inordinate compile times on large
 routines
Date: Tue, 07 Feb 2023 13:39:54 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D26854

--- Comment #144 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:295adfc9ed20468cdaba3afe258d57b58a8df792

commit r13-5729-g295adfc9ed20468cdaba3afe258d57b58a8df792
Author: Richard Biener <rguenther@suse.de>
Date:   Tue Feb 7 13:01:12 2023 +0100

    tree-optimization/26854 - compile-time hog in SSA forwprop

    The following addresses

     tree forward propagate             :  12.41 (  9%)

    seen with the compile.i testcase of this PR which points at
    the has_use_on_stmt function which, for SSA names with many
    uses is slow.  The solution is to instead of immediate uses,
    look at stmt operands to identify whether a name has a use
    on a stmt.  That improves SSA forwprop to

     tree forward propagate             :   1.30 (  0%)

    for this testcase.

            PR tree-optimization/26854
            * gimple-fold.cc (has_use_on_stmt): Look at stmt operands
            instead of immediate uses.=