float CT stringification
fmohamed at mac.com
Thu Jun 5 06:10:21 PDT 2008
On 2008-06-05 15:08:47 +0200, Fawzi Mohamed <fmohamed at mac.com> said:
> On 2008-06-05 14:45:49 +0200, bearophile <bearophileHUGS at lycos.com> said:
>> Fawzi Mohamed:
>>> I don't think that you really gain something by making the
>>> weight value compiletime, just the sparsity structure (number of
>>> variables) makes you gain something...
>> Right, the gain comes only from not doing the multiplication where the
>> coefficient is 1, and not doing anything where it's zero.
>> Still, I'd like to have a CT toString(float).
> maybe, if nobody answers, you have to roll your own, and then you can
> contribute it back...
> real frexp (real value, out int exp);
> and then a bit per bit extraction of value using scalbn or ldexp,
> checking >=0, removing the bit and iterating... e even simpler multipy
> with 2**n_mantissa and cast to integer, and you should be able to do
> convert a float in two integers that you can then write out.
> one should be careful and check that with denormalized numbers it still works
well at least the mantissa should be a long...
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