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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113396] [13/14 Regression] csmith: differences from
 -O2 to -O3
Date: Fri, 15 Mar 2024 16:57:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113396

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
    /* -O3 optimizations.  */
    { OPT_LEVELS_3_PLUS, OPT_fgcse_after_reload, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fipa_cp_clone, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_floop_interchange, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_floop_unroll_and_jam, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fpeel_loops, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fpredictive_commoning, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fsplit_loops, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fsplit_paths, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_ftree_loop_distribution, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_ftree_partial_pre, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_funswitch_loops, NULL, 1 },
    { OPT_LEVELS_3_PLUS, OPT_fvect_cost_model_, NULL, VECT_COST_MODEL_DYNAM=
IC
},
    { OPT_LEVELS_3_PLUS, OPT_fversion_loops_for_strides, NULL, 1 },

    /* -O3 parameters.  */
    { OPT_LEVELS_3_PLUS, OPT__param_max_inline_insns_auto_, NULL, 30 },
    { OPT_LEVELS_3_PLUS, OPT__param_early_inlining_insns_, NULL, 14 },
    { OPT_LEVELS_3_PLUS, OPT__param_inline_heuristics_hint_percent_, NULL, =
600
},
    { OPT_LEVELS_3_PLUS, OPT__param_inline_min_speedup_, NULL, 15 },
    { OPT_LEVELS_3_PLUS, OPT__param_max_inline_insns_single_, NULL, 200 },

So, that is -O2 -fgcse-after-reload -fipa-cp-clone -floop-interchange
-floop-unroll-and-jam -fpeel-loops -fpredictive-commoning -fsplit-loops
-fsplit-paths -ftree-loop-distribution -ftree-partial-pre -funswitch-loops
-fvect-cost-model=3Ddynamic -fversion-loops-for-strides
--param=3Dmax-inline-insns-auto=3D30 --param=3Dearly-inlining-insns=3D14
--param=3Dinline-heuristics-hint-percent=3D600 --param=3Dinline-min-speedup=
=3D15
--param=3Dmax-inline-insns-single=3D200
Of course, some further tweaks could be hidden in target files or something
could just test optimize >=3D 3 or similar.=