[Ffmpeg-devel] Re: [PATCH] Fix compilation when using --disable-opts

Derek E. Lewis delewis
Mon Apr 2 15:17:23 CEST 2007

On Sun, 1 Apr 2007, M?ns Rullg?rd wrote:

> I figured that's what you meant, although with a 64-bit address space
> even truly globally unique addresses would be theoretically possible.
> In practice there would of course be the problem of coordination.
> Besides, no current CPUs have a full 64-bit address space.


No, this is very wrong. All MMUs on sun4u systems, since the 
UltraSPARC-III, have supported full, 64-bit address spaces. Prior to 
UltraSPARC-III (say UltraSPARC-II, which is very, very old), the address 
space had a hole, and thus only a 48-bit address space. All recent POWER 
systems that I've worked with (POWER3, POWER4, and POWER5) have full 
64-bit address spaces, too.

Just beause AMD64 doesn't have a full, 64-bit address space doesn't mean 
real hardware doesn't. :-)

Derek E. Lewis
delewis at acm.org

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