From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id AA8DD3858D33; Wed, 15 May 2024 08:51:15 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org AA8DD3858D33 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1715763075; bh=YnuOuMZZQwFI9CLicUpTov2lvRS5e6zVW2UN89xcBvs=; h=From:To:Subject:Date:In-Reply-To:References:From; b=KRgWbYpw5k0/MwyfNvmG5n1Q6q4vEQC3mgUTw23w9o4XHgZlY06Xj5jQCfxmw8rfM 6Wb28QVjFhldSd20TOuG6XdG+2Tf6GsT1W9xJWR+1N9EMIDD+ofC6qGFvqpafMi3r6 W1cNBxeUO0wd3AhyZ2frZqGx257WUGcY3peSbMow= From: "haochen.jiang at intel dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/115069] 8 bit integer vector performance regression, x86, between gcc-14 and gcc-13 using avx2 target clones on skylake platform Date: Wed, 15 May 2024 08:51:13 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Version: 14.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: haochen.jiang at intel dot com X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D115069 Haochen Jiang changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |haochen.jiang at intel dot= com --- Comment #3 from Haochen Jiang --- >From my investigation, GCC14 generates some perm instructions, which caused data dependency. Going to bisect which commit caused this issue.=