From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 1135 invoked by alias); 31 May 2012 00:30:38 -0000 Received: (qmail 1126 invoked by uid 22791); 31 May 2012 00:30:37 -0000 X-SWARE-Spam-Status: No, hits=-4.3 required=5.0 tests=AWL,BAYES_00,KHOP_RCVD_UNTRUST,KHOP_THREADED,RCVD_IN_HOSTKARMA_W,RCVD_IN_HOSTKARMA_WL X-Spam-Check-By: sourceware.org Received: from relay1.mentorg.com (HELO relay1.mentorg.com) (192.94.38.131) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Thu, 31 May 2012 00:30:25 +0000 Received: from nat-ies.mentorg.com ([192.94.31.2] helo=EU1-MAIL.mgc.mentorg.com) by relay1.mentorg.com with esmtp id 1SZtHU-0007mV-Pw from joseph_myers@mentor.com ; Wed, 30 May 2012 17:30:25 -0700 Received: from digraph.polyomino.org.uk ([172.16.63.104]) by EU1-MAIL.mgc.mentorg.com with Microsoft SMTPSVC(6.0.3790.1830); Thu, 31 May 2012 01:30:23 +0100 Received: from jsm28 (helo=localhost) by digraph.polyomino.org.uk with local-esmtp (Exim 4.74) (envelope-from ) id 1SZtHS-00057I-45; Thu, 31 May 2012 00:30:22 +0000 Date: Thu, 31 May 2012 00:30:00 -0000 From: "Joseph S. Myers" To: Chris Metcalf cc: rth@twiddle.net, libc-ports@sourceware.org Subject: Re: fma ulps In-Reply-To: <4FC6BA7E.7000804@tilera.com> Message-ID: References: <20120530233749.16824.qmail@sourceware.org> <4FC6BA7E.7000804@tilera.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Mailing-List: contact libc-ports-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: libc-ports-owner@sourceware.org X-SW-Source: 2012-05/txt/msg00207.txt.bz2 On Wed, 30 May 2012, Chris Metcalf wrote: > > fma isn't meant to have ulps. > > Just to confirm, I did record some 1-ulp results for tile, but only because > the rounding-mode support doesn't exist. Presumably in that case it's > still better to list ulps than to let the test fail? Given that you know the cause, and that there is an open bug for the issue, yes. But I don't think it's a good idea to add ulps for such functions with fully-defined results without at least having the open bug - and in the alpha case, there is a plausible cause that may not be hard to fix (needing to build s_fma.c, s_fmaf.c and s_fmal.c with -mieee-with-inexact). -- Joseph S. Myers joseph@codesourcery.com