[Bug gas/21874] x86: Multiple segment registers in the address are not detected with -masm=intel

[jbeulich at novell dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=21874

--- Comment #9 from Jan Beulich <jbeulich at novell dot com> ---
(In reply to H.J. Lu from comment #8)
> (In reply to Jan Beulich from comment #7)
> > (In reply to H.J. Lu from comment #6)
> > > If gas doesn't allow multiple segment registers in AT&T syntax, it
> > > shouldn't allow them in Intel syntax.
> > 
> > I can only keep telling you that I view maximum possible compatibility with
> > MASM more important that compatibility between the under-specified (or
> > should I say not specified at all) AT&T syntax. As the maintainer of the
> > Intel syntax code I would not have approved the patch in the shape you've
> > committed it. Please fix it to avoid the need to revert.
> 
> My understanding is that gas can't assemble many assembly codes which
> accept MASM.

Of course, hence me saying "maximum possible compatibility" (instead of saying
"full").

> It is more important for gas to be consistent with itself.

That's a bogus goal imo: Different assembly syntax can naturally result in
apparent inconsistencies.

> In the case of "fs:gs:[eax]", you can replace it with
> "fs:[eax]" to get the same output.

In straight line code yes. But what if a first override is hidden deep in a
macro you can't or don't want to modify, but you need to add an override to in
one special case?

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