Discussion: What is unspec_volatile?

[Paolo Bonzini]

On 11/13/2010 05:10 PM, H.J. Lu wrote:
> On Sat, Nov 13, 2010 at 8:01 AM, Paolo Bonzini<bonzini@gnu.org>  wrote:
>> 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.
>>
>
> That is besides the point. I just pointed out that there was no register barrier
> for IRA.

And I was pointing out that the machine description is wrong :)

Paolo