From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 14E833849AC6; Fri, 17 May 2024 08:41:59 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 14E833849AC6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1715935319; bh=hu1pmBiFqjnVt+WmP4CrC8z6hMKi5C7qSV967yYdnDE=; h=From:To:Subject:Date:In-Reply-To:References:From; b=loTjtouualSTKGtS5s9w+D1dRUsw4wF8A+8/dumg/8gTVP6DI/IVXezu1yGN6kI1H ly9Wg7acoJIH1InlUARjLcOSY4eVkq3fV2xDhVA8aXZq80gsDpzbkVQKjcE8oP5DX2 4ve8e8GnM8cDSMH4/xh8PfBlp1HEvtsRZciMyHE0= From: "ubizjak at gmail dot com" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/115069] [14/15 regression] 8 bit integer vector performance regression, x86, between gcc-14 and gcc-13 using avx2 target clones on skylake platform Date: Fri, 17 May 2024 08:41:56 +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: ubizjak at gmail dot com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 14.2 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_status everconfirmed cf_reconfirmed_on 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 Uro=C5=A1 Bizjak changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Ever confirmed|0 |1 Last reconfirmed| |2024-05-17 --- Comment #8 from Uro=C5=A1 Bizjak --- A better patch: --cut here-- diff --git a/gcc/config/i386/i386-expand.cc b/gcc/config/i386/i386-expand.cc index 4e16aedc5c1..88bfc43201b 100644 --- a/gcc/config/i386/i386-expand.cc +++ b/gcc/config/i386/i386-expand.cc @@ -24493,6 +24493,10 @@ ix86_expand_vecop_qihi2 (enum rtx_code code, rtx d= est, rtx op1, rtx op2) bool op2vec =3D GET_MODE_CLASS (GET_MODE (op2)) =3D=3D MODE_VECTOR_INT; bool uns_p =3D code !=3D ASHIFTRT; + /* ??? VPERMQ is slow and VPMOWVB is only available under AVX512BW. */ + if (!TARGET_AVX512BW) + return false; + if ((qimode =3D=3D V16QImode && !TARGET_AVX2) || (qimode =3D=3D V32QImode && (!TARGET_AVX512BW || !TARGET_EVEX512)) /* There are no V64HImode instructions. */ --cut here--=