This is on a PPC; I would gess that the particular floating point hardware might make a difference.
It shouldn't on any of the micros Squeak is ported to. IEEE754/854 specifies the behavior of these chips, regardless of their makers. The only difference to be had is when an architecture is emulating double-precision using extended-precision. (64-bit floats using an 80-bit base representation). I think this was an option on the Mac68k, but I don't know what SANE did to these calculations.
-John
The PPC does, however, have some interesting instructions, such as its algebraic right shift operator.