Jonathan M Davis Wrote: > Now, assuming that all of that is taken care, if you're using a 32-bit binary > on > a 64-bit system, you're still going to be restricted on how much that program > can use. It doesn't use the native word size of the machine to do what it > does, > and in many cases, running a 32-bit program on a 64-bit machine is slower > than > running a 64-bit version of that program on that machine (though that's going > to > vary from program to program, since there are obviously quite a few factors > which affect efficiency).
The efficiency claim is true. 64-bit architures have much more registers. This can effectively double the code's performance in most cases. Loads and stores can also use full 64 bits of bandwidth instead of 32. Thus again twice as much speed. In general if you worry about larger binary size, use UPX. Other than that, 64 bit code outperforms the 32 bit. We want to keep the fastest compiler title, right?
