Re: Why the 64 bit ISA is better
On 1/19/2013 3:41 AM, berenger.morel@neutralite.org wrote:
> Thanks for detailed informations, I was suggesting some of them
> (instruction sets and range of registers, but did not known about the
> new GPRs), but did not had the knowledge to explain things as nicely as
> you.
>
> I would like to archive your mail, with your permission, as a good
> presentation of the enhancements of x86_64's archs for people interested
> in computers stuff.
I don't mind. But the Wikipedia page has much more detail, so you
should reverence that:
http://en.wikipedia.org/wiki/X86-64
> PS: do you know if, as for 16 bits to 32 bits, there is a the need to
> switch processor's "mode"?
Yes. x86-64 adds 'long' mode which comprises two sub-modes. See the
Wikipedia page or the x86-64 Architectural Programmer's Reference Manual
for details.
--
Stan
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