From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id E97EA385041A; Wed, 26 May 2021 09:54:07 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org E97EA385041A
From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100758] __builtin_cpu_supports does not (always) detect
 "sse2"
Date: Wed, 26 May 2021 09:54:07 +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: 11.1.0
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: marxin at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-100758-4-KbBwOjAUty@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-100758-4@http.gcc.gnu.org/bugzilla/>
References: <bug-100758-4@http.gcc.gnu.org/bugzilla/>
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
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Wed, 26 May 2021 09:54:08 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100758

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Erich Eckner from comment #2)
> We use this in archlinux32 to detect, if we can install packages, that ha=
ve
> sse2 opcodes:
>=20
> If one sets "Architecture =3D auto" in /etc/pacman.conf, uname only gives
> "i686" in both cases (this is how archlinux does/did the probing), and th=
en,
> we probe for sse2 to check, if we really are "i686" or "pentium4" (our
> nomenclature for "i686" + sse2). This works well on amd and intel cpus, b=
ut
> fails on via cpus.
>=20
> Details about expected features: https://archlinux32.org/architecture/
>=20
> We can add some cumbersome code which probes for sse2, but I'd really pre=
fer
> some compiler builtin instead :-)

Eh, including cpuid.h and using that to check for SSE2 shouldn't be too hard
(or parsing /proc/cpuinfo).=