[PATCH] x86: Add .nop directive to assembler
Maciej W. Rozycki
Mon Feb 19 14:45:00 GMT 2018
On Mon, 19 Feb 2018, H.J. Lu wrote:
> >> I have a feeling the default should wire in HANDLE_ALIGN somehow. For
> >> many targets, such as fixed instruction width RISC processors, there is
> >> only going to be one way of filling a given amount of space with no-op
> >> instructions, so I think there's no point in having code duplication
> >> here. And even if there are more ways possible for a given target, then
> >> the `.align' way is still right even if suboptimal.
> > How would you propose to express "I need three nop
> > instructions aka 12 bytes from here" with just .align? (Note: no matter
> > how "here" is currently aligned!)
> .align isn't the same as .nop. However, HANDLE_ALIGN can be updated
> to shared the same code with md_generate_nops, like what I did for x86.
Yes, that's what I meant. It's an internal code wiring thing, not to be
something observable by the user.
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