jkeating at redhat.com
Mon Oct 22 16:20:29 UTC 2007
On Mon, 22 Oct 2007 12:03:05 -0400
Matthew Saltzman <mjs at CLEMSON.EDU> wrote:
> 32-bit runtime in general? Why? (Not a critical "why", a genuinely
> curious "why"...)
On those arches, running 64bit code comes at a penalty. In fact, even
on x86_64 there is a penalty. Larger memory overhead. However on
x86_64 the extra CPU registers gained by running in x86_64 mode
outweigh the memory overhead. Not the case on ppc/sparc where there
are no 'extra registers' to gain. Very little software in very few
situations need 64bit.
Fedora -- All my bits are free, are yours?
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