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Taylor Campbell wrote:
There are some Lisp systems, such as CLISP and SISC (I believe), that allow arbitrary-precision flonums, the precision of which can be specified either through the operations used or by some fluid resource that controls the flonum operations. Fast execution is not really an issue here; I think that there should be no reason to prohibit this kind of extension & to provide a way in code to specify IEEE behaviour explicitly if so desired. Not only is it more flexible to do that, but it also makes the intent of programs clearer.
Lots of interesting stuff: http://www2.hursley.ibm.com/decimal/ The proposed formats, including the arbitrary-precision variants, do include NaNs. E.g.: http://www2.hursley.ibm.com/decimal/dnintro.html http://www2.hursley.ibm.com/deceou/decsample/src/com/ibm/eou/decimal/ModelNumber.java -- --Per Bothner per@xxxxxxxxxxx http://per.bothner.com/