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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/101014] [12 Regression] Big compile time hog
 with -O3 since r12-1268-g9858cd1a6827ee7a
Date: Tue, 15 Jun 2021 06:49:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101014

--- Comment #5 from Martin Li=C5=A1ka <marxin at gcc dot gnu.org> ---
Should be fixed with:

commit ecc5644fa3bc7f37eada2a3e9c627cd1918922e0
Author: Andrew MacLeod <amacleod@redhat.com>
Date:   Mon Jun 14 15:33:59 2021 -0400

    Limit new value calculations to first order effects.

    When utilzing poor values during propagation, we mostly care about valu=
es
that
    were undefined/processed directly used in calcualting the SSA_NAME being
    processed.  2nd level derivations of such poor values rarely affect the
    inital calculation.  Leave them to when they are directly encountered.

            * gimple-range-cache.cc (ranger_cache::ranger_cache): Adjust.
            (ranger_cache::enable_new_values): Set to specified value and
            return the old value.
            (ranger_cache::disable_new_values): Delete.
            (ranger_cache::fill_block_cache): Disable non 1st order derived
            poor values.
            * gimple-range-cache.h (ranger_cache): Adjust prototypes.
            * gimple-range.cc (gimple_ranger::range_of_expr): Adjust.=