Re: [avr-gcc-list] Precision of 64-bit using 32-bit numbers

[Ben L. Titzer]

On Jan 18, 2005, at 8:39 AM, E. Weddington wrote:

> Ganeriwal Saurabh wrote:
>
> > Hi,
> >
> > I am working on some applications on Atmel Atmega128 that requires a
> > precision of 64-bits. However, the maximum precision provded is 
> > 32-bit. I
> > tried using doubledouble but it resulted in a compilation error. Is 
> > there
> > an available library for emulating the 64-bit numerical operations 
> > such as
> > add, subtract, multiply, divide using 32-bit numbers.
>
> Currently there is no abililty to do 64-bit (double) floating point 
> math in avr-libc.
> Somebody would have to volunteer to add this to avr-libc; 
> contributions are welcome.

If you are looking for 64-bit integer support, you may try using "long 
long" as the type.

-B

> Eric
>
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