Date: Sun, 11 Jun 2017 11:04:38 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: [PATCH] s390x: Add single instruction math functions On Sun, Jun 11, 2017 at 12:19:55PM +0200, Szabolcs Nagy wrote: > * 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 Do you know the right predefined macros to check the ISA level? David, any objection to including the #if/#ifdef since at least someone seems to want ability to build for minimum ISA level? Rich
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