From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/15017 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Rich Felker Newsgroups: gmane.linux.lib.musl.general Subject: Re: max_align_t mess on i386 Date: Sat, 14 Dec 2019 13:17:12 -0500 Message-ID: <20191214181712.GX1666@brightrain.aerifal.cx> References: <20191214151932.GW1666@brightrain.aerifal.cx> <871rt6eqx5.fsf@mid.deneb.enyo.de> Reply-To: musl@lists.openwall.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="46093"; mail-complaints-to="usenet@blaine.gmane.org" User-Agent: Mutt/1.5.21 (2010-09-15) To: musl@lists.openwall.com Original-X-From: musl-return-15033-gllmg-musl=m.gmane.org@lists.openwall.com Sat Dec 14 19:17:27 2019 Return-path: Envelope-to: gllmg-musl@m.gmane.org Original-Received: from mother.openwall.net ([195.42.179.200]) by blaine.gmane.org with smtp (Exim 4.89) (envelope-from ) id 1igByp-000Bs7-4S for gllmg-musl@m.gmane.org; Sat, 14 Dec 2019 19:17:27 +0100 Original-Received: (qmail 18116 invoked by uid 550); 14 Dec 2019 18:17:24 -0000 Mailing-List: contact musl-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Original-Received: (qmail 18098 invoked from network); 14 Dec 2019 18:17:24 -0000 Content-Disposition: inline In-Reply-To: <871rt6eqx5.fsf@mid.deneb.enyo.de> Original-Sender: Rich Felker Xref: news.gmane.org gmane.linux.lib.musl.general:15017 Archived-At: On Sat, Dec 14, 2019 at 06:51:50PM +0100, Florian Weimer wrote: > * Rich Felker: > > > However, whatever we do with i386, the option of using 8-byte > > granularity remains open for all the other 32-bit archs, most of which > > tend to be used with machines far more memory-constrained than i386. > > Note that powerpc has a similar issue, but with long double: > > > > But perhaps musl follows the old powerpc ABI, where double and long > double are both binary64 (I have not checked, sorry). We use the ld64 powerpc ABI. musl doesn't support non-IEEE-semantics floating point types (stuff like IBM double-double) and quad was not an option at the time, and if it's even supported now it's messy and requires very recent tooling. BTW I know someone from our community doing both musl and glibc stuff on powerpc is actually interested in continuing to use the ld64 ABI (with the old compat symbols) on glibc due to problems with double-double support in applications. Rich