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Date: Mon, 19 Jul 2004 10:39:45 +1000
From: Peter Grehan <grehan@freebsd.org>
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To: Andrew Gallatin <gallatin@cs.duke.edu>
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Subject: Re: long doubles?
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> According to a printf of sizeof(long double), the size of a long
> double is 8 bytes, the same as a double.  However, according to
> sys/powerpc/include/float.h, LDBL_MANT_DIG == 113..  I don't know a
> lot about floating point, but I'm not sure this is possible. ;)
> 
> If long doubles are 8 bytes (and they are on MacOSX, so that's a good
> sign), then shouldn't the LDBL_* constants be the same as the DBL*
> constants from float.h?  (they are on MacOSX)

  Yeh, I'm not too sure about this. The SVR4 ABI defines long doubles
as 128 bits, and there is a GCC config knob to enable this. I'd
promised David Schultz that'd I would look at fixing this, but
haven't gotten around to it yet.

later,

Peter.