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Re: Question about soft-fp

To: Andreas Jaeger <aj at suse dot de>
Subject: Re: Question about soft-fp
From: Ralf Baechle <ralf at uni-koblenz dot de>
Date: Mon, 24 Jan 2000 15:59:00 +0100
Cc: GNU libc hacker <libc-hacker at sourceware dot cygnus dot com>
References: <u87lhiuh54.fsf@gromit.rhein-neckar.de>

On Mon, Jan 10, 2000 at 03:37:43PM +0100, Andreas Jaeger wrote:

> Since the soft-fp stuff is now in, how can I use it?  Which ports do
> benefit from it?  I'm interested in using the long double support for
> Mips.  Is this possible?
> 
> What is still missing with soft-fp?
> 
> Could anybody enlighten me, please?

The MIPS ABI defines:

	float		32-bit IEEE single precission
	double		64-bit IEEE double precission
	long double	64-bit IEEE double precission

I think having optional higher precission would be nice to have but it would
have to be disabled unless explicitly enabled by some special compiler
option.

As an aside, the RISC/OS and IRIX kernels have the necessary hooks for
triple and quad precission fp in their fp support code.  Seems that
there was no sufficient interest in actually implementing that.

  Ralf

References:
- Question about soft-fp
  - From: Andreas Jaeger

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