[Bug gas/29527] x86: ambiguous operands silently accepted in AT&T mode

[jbeulich at suse dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=29527

--- Comment #3 from Jan Beulich <jbeulich at suse dot com> ---
(In reply to H.J. Lu from comment #2)
> (In reply to Jan Beulich from comment #0)
> >     cvtsi2ss (%rax), %xmm0
> >     vcvtsi2ss (%rax), %xmm0, %xmm0
> >     vcvtusi2ss (%rax), %xmm0, %xmm0
> > 
> 
> They default to 32 bits because when SSE was introduced, it was 32-bit only.

How does "32-bit only" at introduction time matter for 64-bit? When 64-bit was
introduced, disambiguation should have been required (and 32-bit code would
have remained unaffected). In fact the lack thereof had allowed a gcc bug to go
unnoticed for quite some time.

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