[Bug gas/25550] Review .arch directives

[hjl.tools at gmail dot com]

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

--- Comment #10 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Jan Beulich from comment #9)
> (In reply to H.J. Lu from comment #8)
> > We can say something like
> > 
> >      In addition to the basic instruction set, the assembler can be told
> >      to accept various extension mnemonics.  4 separate vector ISA
> >      extension families can be enabled or disabled independent of each
> >      other:
> > 
> >         * 'MMX' - MMX instructions.
> > 
> >         * 'SSE' - SSE instructions without MMX registers.
> 
> This is not a useful category. The only viable options I see are
> - the full set of insns valid with SSE* (including ones accessing MMX
> registers),
> - all insns not touching MMX _state_ (which would permit use of CVTPI2PD
> with a memory operand, but not use of a similar CVTPI2PS).
> 

We need a directive for SSE instructions without MMX registers.
We can give it a different name, something like pure-SSE.

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