From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from bumble.maple.relay.mailchannels.net (bumble.maple.relay.mailchannels.net [23.83.214.25]) by sourceware.org (Postfix) with ESMTPS id 12B6E3A78011 for ; Wed, 28 Apr 2021 15:18:43 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 12B6E3A78011 X-Sender-Id: dreamhost|x-authsender|tuliom@ascii.art.br Received: from relay.mailchannels.net (localhost [127.0.0.1]) by relay.mailchannels.net (Postfix) with ESMTP id E5367483ABD; Wed, 28 Apr 2021 15:00:37 +0000 (UTC) Received: from pdx1-sub0-mail-a91.g.dreamhost.com (100-105-161-122.trex.outbound.svc.cluster.local [100.105.161.122]) (Authenticated sender: dreamhost) by relay.mailchannels.net (Postfix) with ESMTPA id 51EC44839EF; Wed, 28 Apr 2021 15:00:36 +0000 (UTC) X-Sender-Id: dreamhost|x-authsender|tuliom@ascii.art.br Received: from pdx1-sub0-mail-a91.g.dreamhost.com (pop.dreamhost.com [64.90.62.162]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384) by 100.105.161.122 (trex/6.2.1); Wed, 28 Apr 2021 15:00:37 +0000 X-MC-Relay: Neutral X-MailChannels-SenderId: dreamhost|x-authsender|tuliom@ascii.art.br X-MailChannels-Auth-Id: dreamhost X-Versed-Versed: 3e7f9e202242d54f_1619622037122_1031429790 X-MC-Loop-Signature: 1619622037122:1601844187 X-MC-Ingress-Time: 1619622037122 Received: from pdx1-sub0-mail-a91.g.dreamhost.com (localhost [127.0.0.1]) by pdx1-sub0-mail-a91.g.dreamhost.com (Postfix) with ESMTP id 131427E3C4; Wed, 28 Apr 2021 08:00:35 -0700 (PDT) Received: from ascii.art.br (unknown [168.195.64.210]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: tuliom@ascii.art.br) by pdx1-sub0-mail-a91.g.dreamhost.com (Postfix) with ESMTPSA id 329387E3A5; Wed, 28 Apr 2021 08:00:31 -0700 (PDT) X-DH-BACKEND: pdx1-sub0-mail-a91 From: Tulio Magno Quites Machado Filho To: Florian Weimer , Paul Zimmermann Cc: libc-alpha@sourceware.org Subject: Re: use of fma In-Reply-To: <87sg3ake7i.fsf@oldenburg.str.redhat.com> References: <87sg3ake7i.fsf@oldenburg.str.redhat.com> User-Agent: Notmuch/0.31.3 (http://notmuchmail.org) Emacs/27.1 (x86_64-redhat-linux-gnu) Date: Wed, 28 Apr 2021 12:00:29 -0300 Message-ID: <87im46zc6q.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-3.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 28 Apr 2021 15:18:46 -0000 Florian Weimer via Libc-alpha writes: > * Paul Zimmermann: > >> However, on PowerPC __FP_FAST_FMA is defined without -march=native: >> >> pzimmermann@drac-12:~$ gcc -O2 -g -dM -E -xc /dev/null | grep -q __FP_FAST_FMA >> pzimmermann@drac-12:~$ echo $? >> 0 > > I assume that this is powerpc64le, which has a POWER8 baseline. The > switch to little endian neatly eliminated requirements for backwards > compatibility. Side note: single and double-precision multiply-add have been available since the PPC ISA and POWER1 ISA respectively. So, they're also available by default on powerpc64 and powerpc builds supporting hw fpu. -- Tulio Magno