Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.albasani.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.094 X-Spam-Evidence: '*H*': 0.82; '*S*': 0.01; 'subject:Python': 0.06; '754': 0.16; 'exponent': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'hex': 0.16; 'janssen': 0.16; 'sat,': 0.16; 'wrote:': 0.18; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'sets': 0.30; 'message-id:@mail.gmail.com': 0.30; 'skip:( 20': 0.30; '25,': 0.31; 'responded': 0.31; 'subject:end': 0.31; 'fri,': 0.33; 'received:google.com': 0.35; 'really': 0.36; 'area': 0.37; 'clear': 0.37; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'anything': 0.39; 'to:addr:python.org': 0.39; 'even': 0.60; 'more': 0.64; '26,': 0.68; 'flood': 0.68; 'batchelder': 0.84; 'careful': 0.91; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=rXE/tbtg2Gx1rG8NPqiBWN3kMtuCRIy21Sc5Z2I+XXo=; b=FXozlPeHy0S+0IryaxtJ3z64w2lNjv9fC9+9sVRMI8eRlL59ElH6zqxxe2QiHpOkyO QcoBgZAF7tEak8hXjeoAgqrXEPSF/ADVq9A80SExkbaWTDL17SP128/175BPKdfw2Muw qQcFbY0UA5lX3kuHnOLX/ti9Gv2N9fuAq5L4XTEq3wBDHJoKfv7c4yuA1U/WyjZQOe3T oHxFhzwrHyNnbII//VxTGp5cIu0WBYhjbQEgqxkkPXWo1XVxQ0o8MlRGzUS4GF9whbsQ C1lYdpCV8q2wETWoXYnn2vV8rMkEgsvu0q390MfJqFsh2aks9OQEgBBuoDxjNjKBqxY8 705A== MIME-Version: 1.0 X-Received: by 10.68.219.33 with SMTP id pl1mr4597602pbc.147.1382754975515; Fri, 25 Oct 2013 19:36:15 -0700 (PDT) In-Reply-To: References: <4012031f-5334-4be8-a673-e0d8c8917fb2@googlegroups.com> <526668e5$0$29981$c3e8da3$5496439d@news.astraweb.com> <52669852$0$29981$c3e8da3$5496439d@news.astraweb.com> <5266aa80$0$29981$c3e8da3$5496439d@news.astraweb.com> <5266b496$0$29981$c3e8da3$5496439d@news.astraweb.com> <526A81A4.4040100@nedbatchelder.com> <526ADDAE.1070007@nedbatchelder.com> Date: Sat, 26 Oct 2013 13:36:15 +1100 Subject: Re: Python Front-end to GCC From: Chris Angelico To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 15 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1382754979 news.xs4all.nl 15871 [2001:888:2000:d::a6]:38150 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:57588 On Sat, Oct 26, 2013 at 8:37 AM, Mark Janssen wrote: > On Fri, Oct 25, 2013 at 2:07 PM, Ned Batchelder wrote: >> (Offlist) You responded on-list to a private email that was even tagged as off-list. Please be more careful and courteous. Anyway, IEEE floating-point makes it pretty clear that any value that sets the exponent to all-ones and the mantissa to anything other than all-zeros is a NaN. So an all-ones hex pattern (0xFFFFFFFFFFFFFFFF....) will flood the area with NaNs. You really don't understand IEEE 754 here. ChrisA