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Re: [PATCH] x86: Add .nop directive to assembler
On Mon, Feb 19, 2018 at 6:44 AM, Maciej W. Rozycki <firstname.lastname@example.org> wrote:
> 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.
Let me work on it.