gmp 4.2.4 - mpf_add two large negative floats - strange result

[Sisyphus]

----- Original Message ----- 
From: "Sisyphus" <sisyphus1 at optusnet.com.au>

[snip]

>
> Math::BigFloat automatically extends its precision to whatever is needed, 
> but not so with GMP (mpf) - if you want other than 53 bits of precision 
> for the mantissa then you need to specify exactly how many you want.
>

Duh .... 53 bits is the default for mpfr (I think), but the default for 
gmp's mpf type is 64 (on my build, at least).

Cheers,
Rob