On Fri, 08 Apr 2005 07:52:34 +0400
Evgeniy Polyakov <[email protected]> wrote:
> sparc64 has 32->64 conversation on exit.
It's extremely cheap, the conversion instruction
pairs with the retl instruction so it's essentially
free.
Talking about an arithmetic instruction over is complete
nonsense when the atomic CAS instruction itself takes a minimum
of 32 processor cycles :-)
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