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From: "mikpelinux at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/108657] [13 Regression] csmith: possible wrong
 checksum with -O3 and -ftrivial-auto-var-init=zero
Date: Tue, 07 Feb 2023 18:01:32 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D108657

--- Comment #11 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Bisected on x86_64-linux-gnu:

dc477ffb4aba21e9cf47de22a4df6f2b23849505 is the first bad commit
commit dc477ffb4aba21e9cf47de22a4df6f2b23849505
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Jul 21 10:13:46 2022 +0200

    tree-optimization/106378 - DSE of LEN_STORE and MASK_STORE

    The following enhances DSE to handle LEN_STORE (optimally) and
    MASK_STORE (conservatively).

            PR tree-optimization/106378
            * tree-ssa-dse.cc (initialize_ao_ref_for_dse): Handle
            LEN_STORE, add mode to initialize a may-def and handle
            MASK_STORE that way.
            (dse_optimize_stmt): Query may-defs.  Handle internal
            functions LEN_STORE and MASK_STORE similar to how
            we handle memory builtins but without byte tracking.=