From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/7438 Path: news.gmane.org!not-for-mail From: Szabolcs Nagy Newsgroups: gmane.linux.lib.musl.general Subject: Re: ppc64 ABI Date: Sun, 19 Apr 2015 15:54:18 +0200 Message-ID: <20150419135418.GP2875@port70.net> References: Reply-To: musl@lists.openwall.com NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1429451673 24750 80.91.229.3 (19 Apr 2015 13:54:33 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Sun, 19 Apr 2015 13:54:33 +0000 (UTC) To: musl@lists.openwall.com Original-X-From: musl-return-7451-gllmg-musl=m.gmane.org@lists.openwall.com Sun Apr 19 15:54:32 2015 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by plane.gmane.org with smtp (Exim 4.69) (envelope-from ) id 1Yjpg8-0000w2-B5 for gllmg-musl@m.gmane.org; Sun, 19 Apr 2015 15:54:32 +0200 Original-Received: (qmail 9468 invoked by uid 550); 19 Apr 2015 13:54:30 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: Original-Received: (qmail 9439 invoked from network); 19 Apr 2015 13:54:30 -0000 Mail-Followup-To: musl@lists.openwall.com Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.23 (2014-03-12) Xref: news.gmane.org gmane.linux.lib.musl.general:7438 Archived-At: * Justin Cormack [2015-04-19 12:44:15 +0100]: > I am looking at doing a ppc64 port, and after some discussion on irc > last night wondering which ABI to port to. > > ppc64 has two ABIs: > v1: as documented here > v2, usually known as powerpc64le, helpfully. It is not little endian ... > > Both have 16 byte long double oddness. printf/scanf decimal conversion and libm are broken with ibm128 if the toolchain could be configured to use ieee128 then that works (i see -mabi=ieeelongdouble compiler option in gcc, it seems 32bit powerpc sysv abi used to require ieee128 long double, but that was not implemented for aix and darwin so i'm not sure who uses it) 64bit long double works too and that's what musl uses on 32bit powerpc (i dont know how much code breaks if we change long double: i think on typical desktop/server it does not matter, but if you want to run some ppc optimized fortran code then it might..)