From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 65628 invoked by alias); 5 Apr 2017 16:44:50 -0000 Mailing-List: contact gcc-patches-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-patches-owner@gcc.gnu.org Received: (qmail 65242 invoked by uid 89); 5 Apr 2017 16:44:50 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-2.1 required=5.0 tests=AWL,BAYES_00,RCVD_IN_DNSWL_NONE,RCVD_IN_SORBS_SPAM,SPF_PASS autolearn=no version=3.3.2 spammy= X-HELO: mail-lf0-f46.google.com Received: from mail-lf0-f46.google.com (HELO mail-lf0-f46.google.com) (209.85.215.46) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Wed, 05 Apr 2017 16:44:48 +0000 Received: by mail-lf0-f46.google.com with SMTP id j90so13079256lfk.2 for ; Wed, 05 Apr 2017 09:44:49 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=iNVOUE/cjPRs6jz3lpKzo9z2orVpH76FKwqe1WbYP0w=; b=SCNk5Fs8W4UKjFZP5Kb13hs6fBQCOCoHFXOL05jkhr3a/MTZDj03aoqWCW5Oi5LB57 jfEcokp0Vc263k/qZwg056ZGHkWbn2QsVY67RZeQ4mSL6Bn7VkVJaTDJNJrqMzt9KkUy X7dFbPk91UpZqHOyyzM1DniH1LyRfQsYR2aRG/d5XCNYExqi1Qzcyy0Gpiw0LuCwRZoW rDcN1MymS67rHo3GMFRHrrw1ffjshcpK+KhDjaECGQ8rMt4+RB2h/V1F9qYv15aMZejQ MeQOT3RBWxIqD8nzIBgTz8vnWZU04nSfmY5RM3YzgF/wUFw+NRPhtqUbwAiWDPFwb6aM dQjA== X-Gm-Message-State: AFeK/H242SUxHH6tQzbbEDCSZ2ncUZIRtVL6VxKnU/fgpg9I3FPmjmShSFeIU1Zn7RgSQsVSIz6vfQGCHvDI3+gN X-Received: by 10.46.82.208 with SMTP id n77mr8968962lje.56.1491410687427; Wed, 05 Apr 2017 09:44:47 -0700 (PDT) MIME-Version: 1.0 Received: by 10.25.162.145 with HTTP; Wed, 5 Apr 2017 09:44:46 -0700 (PDT) In-Reply-To: References: From: Jim Wilson Date: Wed, 05 Apr 2017 16:44:00 -0000 Message-ID: Subject: Re: [PATCH][AArch64] Enable AUTOPREFETCHER_WEAK with -mcpu=generic To: Wilco Dijkstra Cc: GCC Patches , nd , James Greenhalgh , "Andrew.pinski@cavium.com" , Evandro Menezes Content-Type: text/plain; charset=UTF-8 X-SW-Source: 2017-04/txt/msg00240.txt.bz2 On Wed, Apr 5, 2017 at 5:38 AM, Wilco Dijkstra wrote: > Many supported cores use the AUTOPREFETCHER_WEAK setting which tries > to order loads and stores to improve streaming performance. Since significant > gains were reported in http://patchwork.ozlabs.org/patch/534469/ it seems > like a good idea to enable this setting too for -mcpu=generic. Since the > weak model only keeps the order if it doesn't make the schedule worse, it > should not impact performance adversely on cores that don't show a gain. > Any objections? This is fine with me also. Jim