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. -- H.J.
