From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 0E52345B18 for ; Tue, 11 Jun 2024 09:36:01 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 4EC0C68D7F5; Tue, 11 Jun 2024 12:35:59 +0300 (EEST) Received: from relay6-d.mail.gandi.net (relay6-d.mail.gandi.net [217.70.183.198]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id A249D68D6A7 for ; Tue, 11 Jun 2024 12:35:52 +0300 (EEST) Received: by mail.gandi.net (Postfix) with ESMTPSA id 07574C0006 for ; Tue, 11 Jun 2024 09:35:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=niedermayer.cc; s=gm1; t=1718098552; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=YcZ+b2en1QWnyjTT3s7Om0LpF5LxWye66q9LwsOhcyc=; b=C+Hv8WDweHDzKbKy7ZDWXKed/DVP9Kmlg1hC3PbK71HH82XAIGn8nkjaz3HpAolhrxGyCl ojW+fn8ShV4GzaAtPk2LpsTxmmpL3VOJUZnvE65DMAVOGMqgIE/VxmVcr+Rxsf2Jj/5x4V vkCGKsuAGHuTHxyuv/ONwumd9bduhMT7WEMuRzLmBUBAb71ZIhtVhbFqX0lR1iGg2Q+5Ec 2XsyUF5D5NVb/nPrn2jJDGWhU3lNtnWBywg0sGRLWtuaSLtR2SoAU9XxPq3wmOpdS/iqkC PZmqNSkiG6PosbEgFIXbxE6VlX8sqYVw8YnqBfpWEYI/fXmCp23FeMnUzBaGrw== Date: Tue, 11 Jun 2024 11:35:50 +0200 From: Michael Niedermayer To: FFmpeg development discussions and patches Message-ID: <20240611093550.GG2821752@pb2> References: <20240610115729.GC2821752@pb2> MIME-Version: 1.0 In-Reply-To: X-GND-Sasl: michael@niedermayer.cc Subject: Re: [FFmpeg-devel] remove DEC Alpha DSP & support code X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Content-Type: multipart/mixed; boundary="===============6712786918984798965==" Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: --===============6712786918984798965== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="Fz7Dnydx+M42Ztf/" Content-Disposition: inline --Fz7Dnydx+M42Ztf/ Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Jun 10, 2024 at 03:56:46PM +0300, R=E9mi Denis-Courmont wrote: >=20 >=20 > Le 10 juin 2024 14:57:29 GMT+03:00, Michael Niedermayer a =E9crit=A0: > >Also we have alpha fate clients: > >https://fate.ffmpeg.org/?query=3Dsubarch:alpha%2F%2F >=20 > Are there? I only see Ubuntu 22.04 builds which must be cross-compiled si= nce Ubuntu 22.04 doesn't support DEC Alpha, not even as a port. >=20 > So I guess the tests are run on user-mode QEMU? For the sake of the argum= ent and to answer your performance question, SIMD on QEMU is in my experien= ce much *slower* than scalar C, due to limitations of TCG. So if that's the= goal post, then removing the optimisations is actually a performance win. My performance question was not related to the fate clients. (though they c= ould be affected too) As i wrote "(this allows users to judge if they want to stay on a old ffmpe= g with these optimizations or upgrade)" The fate clients are not real users nor am i thx [...] --=20 Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB Asymptotically faster algorithms should always be preferred if you have asymptotical amounts of data --Fz7Dnydx+M42Ztf/ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iF0EABEKAB0WIQSf8hKLFH72cwut8TNhHseHBAsPqwUCZmgabwAKCRBhHseHBAsP q3GlAJ0V6lD0D2WEoQxLB9aNCd6jIvqOfQCfR968BDMMOZJ48NDImiyWkJnt7sI= =6rYs -----END PGP SIGNATURE----- --Fz7Dnydx+M42Ztf/-- --===============6712786918984798965== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe". --===============6712786918984798965==--