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Message-ID: <20181102161335.GL5150@brightrain.aerifal.cx>
Date: Fri, 2 Nov 2018 12:13:35 -0400
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: Re: [PATCH] PPC64 IEEE128 bit FP support
On Fri, Oct 26, 2018 at 03:01:20PM +0200, Szabolcs Nagy wrote:
> * Markus Wichmann <nullplan@....net> [2018-10-26 06:28:29 +0200]:
> > Now you just need to look through all the maths code to find all the
> > places that need changing. __floatscan() comes to mind immediately. And
> > I don't know if any of the libm functions needs adjustment for this new
> > format.
>
> generic c code in musl should work for all supported
> floating-point formats, which includes ieee binary128
> for long double.
>
> only float.h needs to be set up according to the abi.
>
> some long double math functions don't have high quality
> implementations for ieee binary128 format though.
Yes. Assuming there aren't other problems revealed by my questions
about argument passing and ISA levels, I think the only blocking issue
here is naming the ABI. I forgot to mention but that should also
involve a gcc patch that we can put in mcm and eventually upstream.
QoI issues for IEEE-quad-based [sub]archs can be improved later;
aarch64 and s390x are already affected IIRC.
Rich
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