From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44188) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X4v2h-0004En-6f for qemu-devel@nongnu.org; Wed, 09 Jul 2014 12:48:36 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1X4v2Y-0005qa-0w for qemu-devel@nongnu.org; Wed, 09 Jul 2014 12:48:27 -0400 Received: from mail-yk0-x236.google.com ([2607:f8b0:4002:c07::236]:52586) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1X4v2X-0005qT-ST for qemu-devel@nongnu.org; Wed, 09 Jul 2014 12:48:17 -0400 Received: by mail-yk0-f182.google.com with SMTP id 19so2907827ykq.41 for ; Wed, 09 Jul 2014 09:48:17 -0700 (PDT) Sender: Richard Henderson Message-ID: <53BD724D.2060704@twiddle.net> Date: Wed, 09 Jul 2014 09:48:13 -0700 From: Richard Henderson MIME-Version: 1.0 References: <1404922834-28169-1-git-send-email-rth@twiddle.net> <1404922834-28169-4-git-send-email-rth@twiddle.net> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PULL 03/18] target-alpha: Store IOV exception in fp_status List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Peter Maydell Cc: QEMU Developers , Al Viro On 07/09/2014 09:28 AM, Peter Maydell wrote: > I don't think we should use softfloat flag bits for keeping > information which isn't about softfloat's status. Why can't > you just put this in the per-CPU state? It is (mostly) being stored in per-CPU state. But for efficiency, the per-CPU state is in the softfloat format. For this new bit, I'd prefer to not require a second load to examine the exception flags for the insn. And while I could privately define a symbol for the unused bit in the existing softfloat status, that seemed more hazardous than just defining the bit in the global softfloat enumeration. r~