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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 target/113255] [11/12/13 Regression] wrong code with -O2
 -mtune=k8
Date: Mon, 05 Feb 2024 07:35:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113255

--- Comment #17 from GCC 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:5b281946c4b51132caf5e5b64c730fef92dd6123

commit r14-8796-g5b281946c4b51132caf5e5b64c730fef92dd6123
Author: Richard Biener <rguenther@suse.de>
Date:   Thu Feb 1 13:54:11 2024 +0100

    target/113255 - avoid REG_POINTER on a pointer difference

    The following avoids re-using a register holding a pointer (and
    thus might be REG_POINTER) for the result of a pointer difference
    computation.  That might confuse heuristics in (broken) RTL alias
    analysis which relies on REG_POINTER indicating that we're
    dealing with one.

    This alone doesn't fix anything.

            PR target/113255
            * config/i386/i386-expand.cc
            (expand_set_or_cpymem_prologue_epilogue_by_misaligned_moves):
            Use a new pseudo for the skipped number of bytes.=