Multiarch crazyiness

Jesse Keating jkeating at
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.

Jesse Keating
Fedora -- All my bits are free, are yours?
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