How to tell whether CPU supports x64?

Adam Vande More amvandemore at
Fri Mar 18 00:54:15 UTC 2011

On Thu, Mar 17, 2011 at 7:30 PM, Chad Perrin <perrin at> wrote:

> . . . or maybe it is a 64 bit CPU that is not x86_64/amd64 compatible.
> Do IA-64 (Itanium), IBM POWER, and SPARC 64 bit processors use the same
> Long Mode functionality?

No, it is a function of it's ancestry, real mode, protected mode(16 & 32),
and long mode.  Completely 64 bit native architectures like IA-64 have no
need for such tricks,

Adam Vande More

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