From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 25885 invoked by alias); 22 Dec 2014 16:30:15 -0000 Mailing-List: contact libffi-discuss-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libffi-discuss-owner@sourceware.org Received: (qmail 25872 invoked by uid 89); 22 Dec 2014 16:30:14 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.0 required=5.0 tests=AWL,BAYES_00,SPF_HELO_PASS,SPF_PASS,T_RP_MATCHES_RCVD autolearn=ham version=3.3.2 X-HELO: mx1.redhat.com Received: from mx1.redhat.com (HELO mx1.redhat.com) (209.132.183.28) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with (AES256-GCM-SHA384 encrypted) ESMTPS; Mon, 22 Dec 2014 16:30:13 +0000 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id sBMGUClJ029340 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL) for ; Mon, 22 Dec 2014 11:30:12 -0500 Received: from anchor.twiddle.net (vpn-225-56.phx2.redhat.com [10.3.225.56]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id sBMGUB2U015125 for ; Mon, 22 Dec 2014 11:30:11 -0500 Message-ID: <54984712.2050609@redhat.com> Date: Mon, 22 Dec 2014 16:30:00 -0000 From: Richard Henderson User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: libffi-discuss@sourceware.org Subject: Re: [PATCH 3/4] s390: Reorganize assembly References: <1418938403-15836-1-git-send-email-rth@twiddle.net> <1418938403-15836-4-git-send-email-rth@twiddle.net> <20141222121250.GA25775@linux.vnet.ibm.com> <20141222122517.GA30481@linux.vnet.ibm.com> In-Reply-To: <20141222122517.GA30481@linux.vnet.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit X-IsSubscribed: yes X-SW-Source: 2014/txt/msg00283.txt.bz2 On 12/22/2014 04:25 AM, Dominik Vogt wrote: > Or rather the attached patch stat replaces > > stm %r2,%r3,0(%r12) > nop > > with > > st %r2,0(%r12) > st %r3,4(%r12) Is that really an improvement? (1) You now need a branch for the (presumed) normal "int" case. (2) Is stm really that much faster than two st? I would have thought the reverse, actually. r~