On Wed, 13 Jul 2011, John R Pierce wrote:
> for many things, 32bit code is more compact and runs faster than 64bit
> code (primarily because the code is smaller, so it requires fewer
> fetches, more code fits in the cache, etc). 64 bit OS's totally
> compatible with 32bit applications. of course, if a process needs more
> than a couple gigabytes of address space, then 64bit is a no-brainer,
> but there's really not that many applications which need that sort of
> memory.
Is that generally true? I thought running in 64bit got you access to twice as
many registers and that generally you'd expect better performance from x86_64
code not worse. While pointers would be doubled in size, most of your memory
consumption would boil down to base types that'd be of the same size.
jh
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