fixed point math library recommendations?

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i had posted thread: "floating point precision: true double possible?", seems answer question "no".

...so, in lieu of floating point math on true (64 bit) doubles, i'll need resort using fixed point math.  this require re-writing of normal floating-point functions (sine, tangent, exponentiation, etc.), i'm *sure* has been done before -- many times over.  i'm curious if there recommendations fixed-point math libraries have been tested on arduino.

alternately, arbitrary precision library or library implementing 64-bit floating points extremely useful.  any recommendations appreciated!

thanks,
-jon

have considered library?

http://www.mpfr.org/



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