On Tuesday, November 26, 2002, at 05:02 AM, James Mastros wrote:
Guys, can we please not argue over just how arithmetic and such works for NaN and Inf, and defer to IEEE specs (IEEE-754, AKA IEEE floatingYes and no. perl6-internals has been discussing this, so I think we can pause and not worry about it quite yet. Floats will almost certainly be IEEE, but in addition to floating point ("num", aka C "double"), most of the same issues exist for sized integers, both signed and unsigned. Worse, the behaviors are platform-dependent.
For example, what happens when you add two 8-bit numbers, and the result is no longer an 8-bit number, e.g. 'overflow'? (We may indeed have access to a type called 'int8', since Parrot will likely have it.)
my int8 $i = 254;
my int8 $j = 254;
$i += $j; # ???
Does it overflow (via an exception?), silently truncate, or ?. (Parrot may offer us both options.) We can choose to call the result "platform dependent", or define it explicitly. But let's wait and see what the Parrot people think, since they're closer to the action.
MikeL
