Date: Wed, 17 May 2017 13:17:24 -0400 From: Rich Felker <dalias@...c.org> To: musl@...ts.openwall.com Subject: Re: Musl libm optimizations for Power and Z 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). Rich
Powered by blists - more mailing lists
Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.