[Bug gas/25550] Review .arch directives

[hjl.tools at gmail dot com]

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

--- Comment #14 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jan Beulich from comment #13)
> (In reply to H.J. Lu from comment #12)
> > I want assembler to enforce assembly codes without any access to MMX state.
> 
> 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;

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