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Truncating df to sf (and typo in code)
- From: "Paulo J. Matos" <pocmatos at gmail dot com>
- To: gcc at gcc dot gnu dot org
- Date: Wed, 13 Apr 2011 12:00:49 +0100
- Subject: Truncating df to sf (and typo in code)
Hi,
I have been looking at the fp-bit code and noticed:
/* numeric parameters */
/* F_D_BITOFF is the number of bits offset between the MSB of the mantissa
of a float and of a double. Assumes there are only two float types.
(double::FRAC_BITS+double::NGARDS-(float::FRAC_BITS-float::NGARDS))
*/
#define F_D_BITOFF (52+8-(23+7))
I would guess the comment has a typo and should be
(double::FRAC_BITS+double::NGARDS-(float::FRAC_BITS+float::NGARDS))
instead.
In my port I am having some trouble with the truncation from df to sf.
I wonder if there's any doc reference upon which the code was based to
do the truncation. I can't really find anything and even though the code
is not hard I am still missing something.
Cheers,
--
PMatos