Date: Sun, 11 Jun 2017 12:19:55 +0200 From: Szabolcs Nagy <nsz@...t70.net> To: musl@...ts.openwall.com Subject: Re: [PATCH] s390x: Add single instruction math functions * Rich Felker <dalias@...c.org> [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
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