Re: [PATCH 1/2] x86: Remove dynamic NOP selection

[H. Peter Anvin]

On 1/20/24 08:53, Thorsten Glaser wrote:
> H. Peter Anvin dixit:
>
> > %eiz was something that binutils used to put in when disassembling
> > certain redundant encodings with SIB at some point.
>
> Ah, fair enough. Maybe this could be added as one more line in
> the comment or something.

I think "proper" gas syntax would be 0(%esi,,1), although that doesn't 
assemble either (I don't believe there is a way to get gas to actually 
generate this sequence.)

But yes, with all even remotely recent CPUs all actually handling nopl 
properly, this isn't relevant anymore.

	-hpa