From mboxrd@z Thu Jan 1 00:00:00 1970 X-Msuck: nntp://news.gmane.org/gmane.linux.lib.musl.general/11457 Path: news.gmane.org!.POSTED!not-for-mail From: Szabolcs Nagy Newsgroups: gmane.linux.lib.musl.general Subject: Re: [PATCH] s390x: Add single instruction math functions Date: Mon, 12 Jun 2017 11:03:32 +0200 Message-ID: <20170612090331.GZ9350@port70.net> References: <20170610182950.GV9350@port70.net> <20170610194855.GS1627@brightrain.aerifal.cx> <20170610212801.GW9350@port70.net> <20170611022044.GV1627@brightrain.aerifal.cx> <20170611101955.GX9350@port70.net> Reply-To: musl@lists.openwall.com NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: blaine.gmane.org 1497258276 31301 195.159.176.226 (12 Jun 2017 09:04:36 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Mon, 12 Jun 2017 09:04:36 +0000 (UTC) User-Agent: Mutt/1.6.0 (2016-04-01) To: musl@lists.openwall.com Original-X-From: musl-return-11470-gllmg-musl=m.gmane.org@lists.openwall.com Mon Jun 12 11:04:27 2017 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 4.84_2) (envelope-from ) id 1dKLGt-0007fS-4f for gllmg-musl@m.gmane.org; Mon, 12 Jun 2017 11:04:27 +0200 Original-Received: (qmail 9970 invoked by uid 550); 12 Jun 2017 09:04:26 -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 9639 invoked from network); 12 Jun 2017 09:03:43 -0000 Mail-Followup-To: musl@lists.openwall.com Content-Disposition: inline In-Reply-To: Xref: news.gmane.org gmane.linux.lib.musl.general:11457 Archived-At: * David Edelsohn [2017-06-11 22:46:09 -0400]: > On Sun, Jun 11, 2017 at 6:19 AM, Szabolcs Nagy wrote: > > * Rich Felker [2017-06-10 22:20:44 -0400]: > >> On Sat, Jun 10, 2017 at 05:48:05PM -0400, David Edelsohn wrote: > >> > When I worked with Bobby Bingham to create the s390x port of Musl, I > >> > said that he could assume newer processors. Also, I don't believe > >> > that LLVM supports the earlier processors. I believe that he assumed > >> > some more recent instructions in other parts of the code. > >> > >> That seems doubtful; the amount of asm in musl is minimal and unlikely > >> to benefit from later ISA levels; all the instructions I see look like > >> very basic stuff that would always have been available. > >> > >> Now, what likely is accurate is your claim that nobody is using musl > >> on lower ISA levels, so maybe it doesn't matter. > > > > well i am using s390x musl with lower isa level for compile tests > > > > and it seems gas rejects unrecognized opcodes so the new inline > > asm does not compile for me. > > > > i think either musl configure should make sure the cc targets > > the right isa level or the code should handle it with ifdefs > > I have asked the IBM toolchain team how to distinguish the > architecture level at compile time, or at least distinguish support > for the FP rounding instruction. > > Are you actually running s390x musl on a system earlier than z196 > architecture level? The public IBM LinuxONE Cloud is running on a z13 > system, many generations newer than even z196. > no, i only have a cross compiler, but since the toolchain build script uses default settings i get z900 arch, if that's not good then gcc config default should be fixed for musl. > The following IBM table of supported and tested systems > > https://www-03.ibm.com/systems/z/os/linux/resources/testedplatforms.html > > shows that RHEL 7 and SLES 12 require at least z196, and Ubuntu 16.04 > requires at least zEC12. > > I can't find any official hardware requirements description for Alpine > Linux. I tend to doubt that user would run it on older hardware, > especially hardware no longer supported by other, modern Linux > distributions. > > Building musl libc on older hardware is a nice accomplishment, but > investing effort and complexity to maintain support probably isn't > useful to any musl libc user and probably isn't a productive use of > developer resources. > > I will continue to inquire if there is a simple technique to accomplish this. > > Thanks, David