On 11/13/2010 05:10 PM, H.J. Lu wrote:
On Sat, Nov 13, 2010 at 8:01 AM, Paolo Bonzini<bonz...@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
