Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp3288265imu; Mon, 17 Dec 2018 17:14:54 -0800 (PST) X-Google-Smtp-Source: AFSGD/VW8lI5dUtGO+MClDjP5PEIeBjLLEXTDRGyHzQy8qRSRua2RwdF7Eg8qQ7W3CaBySRWrKT2 X-Received: by 2002:a62:59c9:: with SMTP id k70mr14746758pfj.243.1545095694782; Mon, 17 Dec 2018 17:14:54 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1545095694; cv=none; d=google.com; s=arc-20160816; b=MWzHcK7owAU/sbj8gtTAUlqTErqByh9VQhugBYjAyhVl4XwycT5zv7R10Jp6azdMXF ZxoTadTvONh06vh9G8cggakIPAVZV/ArcsrtJ8ou2nVZyZNBlBV4r3HIpQiSSBff9STw ttS3gKEgzqIzko5+DmDqVMI1QRmbWntmYRV3PG6ygf+Uf8jxCVs8JRUWO9fx2F7nUxZ3 aQnkO3Apw4lOSa65DX4I2QO/kGwkQJ0CadBStsf/rKKg2CNeySZBSb5njSl8w3FYCeJ0 ZsYM7uHmo7Yf0951AT0/6vTAPGpI13kDNMcVGysFSjngSuYSCKZteZ4dxK0INJiuPiJt eAfg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:message-id:subject:cc :to:from:date; bh=tqrc/pztXef3g9EZFESJneZR8P1hMiiYW4Qs36PKmJM=; b=fFp/3z6UwiSrd7XynIFmCeh4vxMBll1K+CjG8wfqbzY600dN41iVdlRN/QxF6S1Ntg xfr9rA2hgwNlTwV00eDOzD7r2OOtwi3u8RBLVmq78MnhH8KaESbUz4cuZ5CBlmhIezDl gygdkPQxtAsfYI0wf7CVz/R+dcEY75RgQ85YUKY0TpQoxdtOA3he6YFlvYnF6mMVOySv tsKnsy3riBgP22m+Sjgv0jHoWFSqTGLCYu1BRSXY4f/QKvHA+ZwWsho91386faX9GrCH /S3YUwztMZU89F9/s3alkGI3GPiJaZ3tSHbGqAltYjtNUWBdUExKo7twUbvzXTShtHTU dc+g== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=iki.fi Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b12si11295837pls.32.2018.12.17.17.14.39; Mon, 17 Dec 2018 17:14:54 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=iki.fi Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726316AbeLRBNu (ORCPT + 99 others); Mon, 17 Dec 2018 20:13:50 -0500 Received: from emh01.mail.saunalahti.fi ([62.142.5.107]:57472 "EHLO emh01.mail.saunalahti.fi" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726260AbeLRBNt (ORCPT ); Mon, 17 Dec 2018 20:13:49 -0500 Received: from darkstar.musicnaut.iki.fi (85-76-70-99-nat.elisa-mobile.fi [85.76.70.99]) by emh01.mail.saunalahti.fi (Postfix) with ESMTP id 2DEE220019; Tue, 18 Dec 2018 03:13:47 +0200 (EET) Date: Tue, 18 Dec 2018 03:13:47 +0200 From: Aaro Koskinen To: "Maciej W. Rozycki" Cc: Rich Felker , Andy Lutomirski , Linux MIPS Mailing List , LKML , Paul Burton , David Daney , Ralf Baechle , Paul Burton , James Hogan Subject: Re: Fixing MIPS delay slot emulation weakness? Message-ID: <20181218011346.GA26211@darkstar.musicnaut.iki.fi> References: <20181215225009.GB23599@brightrain.aerifal.cx> <20181216023259.GE23599@brightrain.aerifal.cx> <20181216181336.GG23599@brightrain.aerifal.cx> <20181217005915.GH23599@brightrain.aerifal.cx> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On Mon, Dec 17, 2018 at 01:55:28AM +0000, Maciej W. Rozycki wrote: > As to actual implementations I believe all the Cavium Octeon line CPUs > (David, please correct me if I am wrong) have no FPU and they have vendor > extensions beyond the base ISA + ASE instruction set. Arguably you could > say that their additional instructions should not be scheduled into FPU > branch delay slots then, however the toolchain will happily do that, as I > wrote before. Octeon III added/introduced FPU. A.