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Date:      Sun, 10 Nov 2013 10:05:18 +0000
From:      David Chisnall <theraven@FreeBSD.org>
To:        David Schultz <das@FreeBSD.org>
Cc:        "freebsd-numerics@FreeBSD.org" <freebsd-numerics@FreeBSD.org>, Steve Kargl <sgk@troutmask.apl.washington.edu>, Bruce Evans <brde@optusnet.com.au>
Subject:   Re: MUSL math functions
Message-ID:  <15792BD0-C47C-4DCA-A112-D3C54F211E67@FreeBSD.org>
In-Reply-To: <20131108085039.GA1821@zim.MIT.EDU>
References:  <DFD5EA35-ABDA-4A09-BFC7-9452D650C7FE@FreeBSD.org> <20131031133352.GA59918@troutmask.apl.washington.edu> <20131101072032.P1002@besplex.bde.org> <20131108085039.GA1821@zim.MIT.EDU>

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On 8 Nov 2013, at 08:50, David Schultz <das@FreeBSD.ORG> wrote:

> However, several things have happened since then. For one, years
> have passed and there's still quite a bit of work to do. For two,
> the only ld128 platform, sparc64, doesn't look as important as it
> used to be. For a long time, we had trouble even finding a viable
> test machine. Therefore, I think any incremental improvement would
> be welcome -- even if it means doing ld80 only.

The PowerPC SysV ABI says that it's ld128 - we only use 64 bit because =
of lack of compiler support when the architecture was brought up, every =
other OS uses 128 bit (although I think PPC 128-bit floats are not quite =
the same as IEEE 128-bit floats, which may cause some problems).  It's =
quite likely that we'll change it to ld128 at some point, although that =
will involve some ABI breakage which is unfortunate. =20

ARMv8 is ld128 and, although it support hasn't landed yet (it's under =
development), it is likely to be a very important platform for FreeBSD =
in coming years.

MIPS is also ld128 on most systems, but the fact that there is no =
128-bit floating point hardware for MIPS (except in one ASE, where there =
is one 128-bit floating point accumulator register) makes this quite a =
silly choice, so it will probably stay ld64.

David




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