Re: Discussion: What is unspec_volatile?

Sat, 13 Nov 2010 08:01:31 -0800 

On 11/13/2010 04:28 PM, H.J. Lu wrote:

VZEROUPPER is no-nop to executions. But it isn't no-nop for performance.



IIUC it's a noop as GCC uses it.  You could use it in 256-bit mode and 
it would be valid, but not a noop.


Paolo






















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