Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759819AbYF0Ntd (ORCPT ); Fri, 27 Jun 2008 09:49:33 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755441AbYF0NtB (ORCPT ); Fri, 27 Jun 2008 09:49:01 -0400 Received: from gate.crashing.org ([63.228.1.57]:40403 "EHLO gate.crashing.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755337AbYF0Ns7 (ORCPT ); Fri, 27 Jun 2008 09:48:59 -0400 Cc: joseph@codesourcery.com, linux-kernel@vger.kernel.org, libc-alpha@sourceware.org Message-Id: <477EA92C-D28C-4745-A805-387C359C51E8@kernel.crashing.org> From: Kumar Gala To: David Miller In-Reply-To: <20080612.212457.01943346.davem@davemloft.net> Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (Apple Message framework v924) Subject: Re: math-emu issue with fp divide Date: Fri, 27 Jun 2008 08:48:33 -0500 References: <20080604.144950.117343339.davem@davemloft.net> <20080612.212457.01943346.davem@davemloft.net> X-Mailer: Apple Mail (2.924) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1335 Lines: 38 On Jun 12, 2008, at 11:24 PM, David Miller wrote: > From: Kumar Gala > Date: Thu, 5 Jun 2008 08:38:44 -0500 (CDT) > >> Now that I'm digging into this a bit I'm thinking my issue has to >> do with >> the fix you put in place from back in Aug 2007 (commit >> 405849610fd96b4f34cd1875c4c033228fea6c0f): >> >> [MATH-EMU]: Fix underflow exception reporting. >> >> 2) we ended up rounding back up to normal (this is the case where >> we set the exponent to 1 and set the fraction to zero), this >> should set inexact too >> ... >> >> Another example, "0x0.0000000000001p-1022 / 16.0", should signal >> both >> inexact and underflow. The cpu implementations and ieee1754 >> literature is very clear about this. This is case #2 above. >> >> I'm not clear from your commit comment on what actual number >> 0x0.0....01p-1022 is? > > I haven't been able to look closely at this yet but I think I > happened to stumble over the test case that lead me to that > changeset you are referencing here. Have you had a chance to look at this? - k -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/