Re: Floating point, again...

> Mosher's code isn't always-correct; it even given an
error bound in the
> source.

You means this?

/* Multiply by 10**nexp.  If precision is 64 bits,
 * the maximum relative error incurred in forming 10**n
 * for 0 <= n <= 324 is 8.2e-20, at 10**180.
 * For 0 <= n <= 999, the peak relative error is
1.4e-19 at 10**947.
 * For 0 >= n >= -999, it is -1.55e-19 at 10**-435.
 */

I did try 10e180, 10e947, and 10e-435 -- for those three
acfloat3
does match what his ieee.c spits out.

> Simply using GMP/MPFR would probably be the easiest,
except possibly for
> the autoconf-challenged platforms.

So far NASM has had the nice property of being standalone.
The
trend towards more and more dependencies worries me a little
--
the more complex, the more easily things tend to break.

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anonymous coward wrote:
>> Mosher's code isn't always-correct; it even given
an error bound in the
>> source.
> 
> You means this?
> 
> /* Multiply by 10**nexp.  If precision is 64 bits,
>  * the maximum relative error incurred in forming
10**n
>  * for 0 <= n <= 324 is 8.2e-20, at 10**180.
>  * For 0 <= n <= 999, the peak relative error is
1.4e-19 at 10**947.
>  * For 0 >= n >= -999, it is -1.55e-19 at
10**-435.
>  */
> 
> I did try 10e180, 10e947, and 10e-435 -- for those
three acfloat3
> does match what his ieee.c spits out.
> 

Yes, and they're both wrong, that was the point.

	-hpa

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