> Any other instructions I should look into? Perhaps lret/lret im?
Possibly (for completeness), but they are extremely rare in 32- and
64-bit code.
You also didn't cover any of syscall/sysret and sysenter/sysexit in your
patch, which would be on a relatively slow path but not _that_ slow.
But th
On Wed, Apr 12, 2017 at 11:43:45 +0800, Paolo Bonzini wrote:
>
>
> On 12/04/2017 09:17, Emilio G. Cota wrote:
> >
> > The fact that NBench is not very sensitive to changes here is a
> > little surprising, especially given the significant improvements for
> > ARM shown in the previous commit. I w
On 12/04/2017 09:17, Emilio G. Cota wrote:
>
> The fact that NBench is not very sensitive to changes here is a
> little surprising, especially given the significant improvements for
> ARM shown in the previous commit. I wonder whether the compiler is doing
> a better job compiling the x86_64 ver
Speed up indirect branches by adding a helper to look for the
TB in tb_jmp_cache. The helper returns either the corresponding
host address or NULL.
Measurements:
- NBench, x86_64-linux-user. Host: Intel i7-4790K @ 4.00GHz
Y axis: Speedup over 95b31d70
