any floating point library with more exponent bits?
hi,
i was wondering if anyone has ever seen a floating point library that uses at least 20 bits to represent the exponent, rather than the 11 bits for a doubleprecision standard IEEE754 float. thanks in advance! henry 
Re: any floating point library with more exponent bits?
> i was wondering if anyone has ever seen a floating point library that
>uses at least 20 bits to represent the exponent, rather than the 11 >bits for a doubleprecision standard IEEE754 float. thanks in >advance! IEEE extendedprecision seems to use 15 bits for the exponent (including exponent sign). That gets up to 1.1e+4932 or so. I don't know of any hardware that uses more (not to say there isn't any). Software emulation is possible (but likely slow). Gordon L. Burditt 
Re: any floating point library with more exponent bits?
thanks! do you know of any software emulation package that is good,
but short of "arbitrary precision" library? i guess what i'm after is "extended range", rather than "extended precision". and, if there is a free library, i'd rather use that than retool my algorithm (a bayesian network, which alternately sums, multiplies and divides numbers, and would be very hard to rewrite in logspace). thanks again, henry 
Re: any floating point library with more exponent bits?

Re: any floating point library with more exponent bits?
hrbigelow@gmail.com a écrit :
> hi, > i was wondering if anyone has ever seen a floating point library that > uses at least 20 bits to represent the exponent, rather than the 11 > bits for a doubleprecision standard IEEE754 float. thanks in > advance! > > henry > lccwin32 offers a 350 bits library htpp://www.cs.virginia.edu/~lccwin32 
Re: any floating point library with more exponent bits?
thanks gordon. i'm actually writing in o'caml :) so unfortunately the
long double is not available. so far i'm using gmp as a software emulation. any idea how much faster hardware is from software? thanks again, henry 
Re: any floating point library with more exponent bits?
thanks for the excellent tip. i'm now using gmp and so far works great.

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