From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 100586 invoked by alias); 18 Sep 2017 09:38:07 -0000 Mailing-List: contact fortran-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Post: List-Help: , Sender: fortran-owner@gcc.gnu.org Received: (qmail 100306 invoked by uid 89); 18 Sep 2017 09:38:07 -0000 Authentication-Results: sourceware.org; auth=none X-Virus-Found: No X-Spam-SWARE-Status: No, score=-1.0 required=5.0 tests=AWL,BAYES_00,KAM_LAZY_DOMAIN_SECURITY,RP_MATCHES_RCVD autolearn=no version=3.3.2 spammy=Hx-spam-relays-external:sk:mailhos, H*RU:sk:mailhos, life, H*Ad:U*janus X-Spam-User: qpsmtpd, 2 recipients X-HELO: nef2.ens.fr Received: from nef2.ens.fr (HELO nef2.ens.fr) (129.199.96.40) by sourceware.org (qpsmtpd/0.93/v0.84-503-g423c35a) with ESMTP; Mon, 18 Sep 2017 09:38:02 +0000 Received: from mailhost.lps.ens.fr (tournesol.lps.ens.fr [129.199.120.1]) by nef2.ens.fr (8.13.6/1.01.28121999) with ESMTP id v8I9bwPc038335 ; Mon, 18 Sep 2017 11:37:59 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by mailhost.lps.ens.fr (Postfix) with ESMTP id BBA74140; Mon, 18 Sep 2017 11:37:58 +0200 (CEST) Received: from mailhost.lps.ens.fr ([127.0.0.1]) by localhost (tournesol.lps.ens.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Qrlb8dPxmReX; Mon, 18 Sep 2017 11:37:58 +0200 (CEST) Received: from [192.168.1.11] (log78-1-82-242-47-10.fbx.proxad.net [82.242.47.10]) by mailhost.lps.ens.fr (Postfix) with ESMTPSA id 93EFE13E; Mon, 18 Sep 2017 11:37:58 +0200 (CEST) From: =?utf-8?Q?Dominique_d=27Humi=C3=A8res?= Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 (Mac OS X Mail 10.3 \(3273\)) Subject: Re: [Patch, Fortran] PR 82143: add a -fdefault-real-16 flag Message-Id: Date: Mon, 18 Sep 2017 09:38:00 -0000 Cc: gfortran To: Janus Weil X-SW-Source: 2017-09/txt/msg00060.txt.bz2 For the record, I just stumbled on http://www.davidhbailey.com/dhbpapers/mp= fun2015.pdf. IMO if real(8) is not enough for a given problem, this is really the way to= go (there is no guarantee that real(16) will be enough). In my "real life"= , real(8) was not enough only once and real(16) was not enough too: I had t= o use precisions between 40 and 200 with Mathematica. Dominique