Re: x86/asm: __clear_user() micro-optimization (was: "Re: [GIT PULL] x86/asm changes for v4.18")

[Linus Torvalds]

On Tue, Jun 5, 2018 at 3:41 PM Alexey Dobriyan <adobriyan@xxxxxxxxx> wrote:
>
> On my potato performance increase is 33%, sheesh.
> And CPU starts doing 3 instructions per cycle vs 2.

Whee. That's a shockingly big difference. On my CPU (i7-6700K) it
makes absolutely no difference whether the values are integers or in
registers.

               Linus