From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marius Bakke Subject: Re: [PATCH 2/2] gnu: icecat: Use libjpeg-turbo instead of bundled libjpeg. Date: Sun, 27 Nov 2016 22:50:35 +0100 Message-ID: <87wpfotwwk.fsf@kirby.i-did-not-set--mail-host-address--so-tickle-me> References: <20161127201707.3789-1-me@tobias.gr> <20161127201707.3789-2-me@tobias.gr> <20161127205618.GC27187@jasmine> <20161127214119.GB30774@jasmine> Mime-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Return-path: Received: from eggs.gnu.org ([2001:4830:134:3::10]:49381) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cB7LN-0004GY-Fp for guix-devel@gnu.org; Sun, 27 Nov 2016 16:50:42 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1cB7LK-0003fA-7Y for guix-devel@gnu.org; Sun, 27 Nov 2016 16:50:41 -0500 Received: from out5-smtp.messagingengine.com ([66.111.4.29]:52516) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1cB7LK-0003f2-3A for guix-devel@gnu.org; Sun, 27 Nov 2016 16:50:38 -0500 In-Reply-To: <20161127214119.GB30774@jasmine> List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+gcggd-guix-devel=m.gmane.org@gnu.org Sender: "Guix-devel" To: Leo Famulari , Tobias Geerinckx-Rice Cc: guix-devel@gnu.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Leo Famulari writes: > On Sun, Nov 27, 2016 at 10:02:35PM +0100, Tobias Geerinckx-Rice wrote: >> Leo, >>=20 >> On 27/11/16 21:56, Leo Famulari wrote: >> > Will this work on nachines that don't support SSE? My understanding is >> > that we don't wish to require it. >>=20 >> Why wouldn't it? >>=20 >> I don't often use Icecat, but when I do... I don't see why it would >> require SSE by default. ;-) And it's not like we ever patched it to use >> IJG's libjpeg to begin with. > > I'm not sure, but the comment seems to indicate that we don't want to > use it: > > ;; According to > ;; http://sourceforge.net/projects/libjpeg-turbo/ , > ;; "libjpeg-turbo is a derivative of libjpeg that > ;; uses MMX, SSE, SSE2, and NEON SIMD instructions > ;; to accelerate baseline JPEG compression/ > ;; decompression", so we had better not use it SSE is pentium III, and SSE2 was introduced in Pentium IV. MMX is even older. Are we really committed to supporting 15+ year old hardware? The NEON SIMD instruction seems to be ARM-specific and is available at least on Cortex A8, which is an ARMv7 design. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEu7At3yzq9qgNHeZDoqBt8qM6VPoFAlg7VSsACgkQoqBt8qM6 VPrZLgf+KNjUWh1Lky8XFmLzpjc52G0eAcMUHDTE2atuXBEXIey30l0s4SaONkN8 neLQCIlVNpdvw2Pl6599c2GYRhLgptoeSnMlIivXE0KDye/WMiaFh1/eTz/ziJDs oAuqVjUZTbVZPeORu/y4aLSxkUwyL7F2AAgO4MamP5N1rgbrJsrMZsrfv893+Z22 7H6gUCOiZPboMZFHZPAn7+GmGgqLMZ7xygwrsaj3PiNJn02MmpFlLWH7L1pjyJaM yB+ZaXKvpcyBAS3eGX0Q/YJ46k3UieR/Jd7z5vi1aMer4j1PsiHXxnk1Tm4hF/zB mirA6x2H8Br/Jxcx72kSJntrAe4HFA== =C8qQ -----END PGP SIGNATURE----- --=-=-=--