Date: Wed, 17 May 2017 13:05:31 -0400 From: David Edelsohn <dje.gcc@...il.com> To: musl@...ts.openwall.com Subject: Re: Musl libm optimizations for Power and Z On Wed, May 17, 2017 at 12:33 PM, Rich Felker <dalias@...c.org> wrote: > On Wed, May 17, 2017 at 10:52:05AM -0400, David Edelsohn wrote: >> On Wed, May 17, 2017 at 10:26 AM, Szabolcs Nagy <nsz@...t70.net> wrote: >> > * David Edelsohn <dje.gcc@...il.com> [2017-05-17 09:49:22 -0400]: >> >> Are there any musl developers who would be interested to work on musl >> >> libm optimizations for Power and Z as financial bounties? >> > >> > i hope it is something upstreamable >> > (i'm interested in libm optimizations, but cant work for bounties) >> >> I'm not certain what you mean. We want musl libm to include >> optimizations for Power and Z in the musl repository and releases. > > Upstreamability could include 2 things: both your/contributor's > willingness to submit the code upstream, and appropriateness of it for > inclusion. > > In general we avoid having per-arch math code that's more than simple > fpu instruction wrappers -- math/i386/*.s is about the upper bound on > what I have in mind, as opposed to something like using an entirely > different C algorithm that just happens to be faster on the arch or > that only tangentially uses arch-specific insns. And more importantly, > arch-specific math asm should not be sacrificing correctness/quality > of results for performance or other considerations. The Power and Z ports deserve the same math instruction optimizations as x86 and ARM. Thanks, David
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