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Date: Sun, 11 Jun 2017 11:04:38 -0400
From: Rich Felker <>
Subject: Re: [PATCH] s390x: Add single instruction math functions

On Sun, Jun 11, 2017 at 12:19:55PM +0200, 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

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?


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