Date: Thu, 18 May 2017 12:31:08 -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 1:17 PM, Rich Felker <dalias@...c.org> wrote: > On Wed, May 17, 2017 at 01:05:31PM -0400, David Edelsohn wrote: >> 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. > > Yes, agreed. My reply was to explain what the rough intent of that > "sameness" is, and the preferred approach going forward (which I want > to eventually move older archs over to as well -- using C files with > asm rather than .s/.S files). I had hoped that Bobby Bingham would be interested to work on this, but I have not heard from him in a while. Is there anyone else in the community who would be interested to work on this? Thanks, David
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