[Bug gas/25550] Review .arch directives

[jbeulich at suse dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=25550

--- Comment #16 from Jan Beulich <jbeulich at suse dot com> ---
(In reply to H.J. Lu from comment #14)
> (In reply to Jan Beulich from comment #13)
> > Well, that's what is described by my 2nd option, but it is (as explained)
> > specifically not sufficient to merely exclude all uses of MMX registers to
> > achieve this.
> 
> It is no difference from
> 
>      if (i.has_regmmx
>           || i.tm.base_opcode == 0xf77 /* emms */
>           || i.tm.base_opcode == 0xf0e /* femms */)
>         x86_feature_2_used |= GNU_PROPERTY_X86_FEATURE_2_MMX;

It is, for the case where no MMX register is used, but MMX state still gets
engaged (like CVTPI2PS with a memory operand).

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