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Re: Darwin long doubles and controlled rounding

From: Roberto Bagnara <bagnara at cs dot unipr dot it>
To: Geoffrey Keating <geoffk at apple dot com>
Cc: gcc at gcc dot gnu dot org
Date: Sat, 08 Apr 2006 22:52:39 +0200
Subject: Re: Darwin long doubles and controlled rounding
References: <4409D59A.7000604@cs.unipr.it> <m2vetq6s2l.fsf@greed.local>

Geoffrey Keating wrote:

Roberto Bagnara <bagnara@cs.unipr.it> writes:

Hi there,

I have read the files darwin-ldouble* in GCC 4.1.0.
What I would like do know is whether I can expect
long doubles on Darwin to comply with  ISO C99 7.6
(Floating-point environment).


They can be made compliant with that section, but it requires
cooperation from the project providing fenv.h.

I am particularly interested in the possibility
of setting the rounding mode with fesetround().
Is this supported?


This implementation only supports one rounding mode, FE_TONEAREST, so
it's not useful to call fesetround().


Thanks for the information.  Are there any plans to extend it
to support the rounding modes to minus and plus infinity?
All the best,

Roberto

--
Prof. Roberto Bagnara
Computer Science Group
Department of Mathematics, University of Parma, Italy
http://www.cs.unipr.it/~bagnara/
mailto:bagnara@cs.unipr.it

References:
- Re: Darwin long doubles and controlled rounding
  - From: Geoffrey Keating

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