Raymond Toy writes: >>>>>> "Daniel" == Daniel Kochma <Daniel> writes: > > Daniel> Also, we'll have to define such infinity for each architecture > Daniel> separately, depending on the endianess? > >> > >> Yes, probably. But you only need to set up MSB/LSB to get the right > >> thing. I think. At least that's how fdlibm works and how cmucl > >> produces it's infinities (in C code). Of course in Lisp, cmucl has > >> special builtins to create floats from bits appropriately. Perhaps > >> ecl can do something similar. (But there are separate implementations > >> for each architecture.) > > Daniel> I'd rather avoid that. ECL runs now on number of architectures I > have no > Daniel> access too. > > I suspect every arch you care about has 32 (or 64) bit words, and all > floats are IEEE. > > So, perhaps it would be easier to create them as you mentioned > earlier via 1/0 and 0/0 or related expressions. > > This requires that you be able to turn off exceptions in C, but ecl > can probably already do that.
I'll fallback to it, if C99 extension isn't present, that is: #ifndef INFINITY #define INFINITY (1.0 / 0.0) #endif #ifndef NAN #define NAN (0.0 / 0.0) #endif Thanks for help. Best regards, Daniel -- Daniel Kochmański | Poznań, Poland ;; aka jackdaniel "Be the change that you wish to see in the world." - Mahatma Gandhi
