From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757633AbaIRWzo (ORCPT ); Thu, 18 Sep 2014 18:55:44 -0400 Received: from gw-1.arm.linux.org.uk ([78.32.30.217]:33857 "EHLO pandora.arm.linux.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751978AbaIRWzm (ORCPT ); Thu, 18 Sep 2014 18:55:42 -0400 Date: Thu, 18 Sep 2014 23:55:31 +0100 From: Russell King - ARM Linux To: Stephen Boyd Cc: linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, Will Deacon , Stepan Moskovchenko , linux-kernel@vger.kernel.org Subject: Re: [PATCH 3/3] arm: vfp: Bounce undefined instructions in vectored mode Message-ID: <20140918225531.GG5182@n2100.arm.linux.org.uk> References: <1411076592-6157-1-git-send-email-sboyd@codeaurora.org> <1411076592-6157-4-git-send-email-sboyd@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1411076592-6157-4-git-send-email-sboyd@codeaurora.org> User-Agent: Mutt/1.5.19 (2009-01-05) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 18, 2014 at 02:43:12PM -0700, Stephen Boyd wrote: > From: Stepan Moskovchenko > > Certain ARM CPU implementations (e.g. Cortex-A15) may not raise a > floating- point exception whenever deprecated short-vector VFP > instructions are executed. Instead these instructions are treated > as UNALLOCATED. Change the VFP exception handling code to emulate > short-vector instructions even if FPEXC exception bits are not > set. Purely out of interest, how much use do these instructions have in real programs? -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net.