[PATCH] x86: Document movsx/movsxd/movzx for AT&T syntax

[Jan Beulich]

On 14.02.2020 13:24, H.J. Lu wrote:
> Assembler has been this way from the start.  I am checking in
> this patch to document different mnemonics of movsx, movsxd
> and movzx in AT&T syntax.

You do realize that there already was

"Almost all instructions have the same names in AT&T and Intel format.
 There are a few exceptions.  The sign extend and zero extend
 instructions need two sizes to specify them.  They need a size to
 sign/zero extend @emph{from} and a size to zero extend @emph{to}.  This
 is accomplished by using two instruction mnemonic suffixes in AT&T
 syntax.  Base names for sign extend and zero extend are
 @samp{movs@dots{}} and @samp{movz@dots{}} in AT&T syntax (@samp{movsx}
 and @samp{movzx} in Intel syntax).  The instruction mnemonic suffixes
 are tacked on to this base name, the @emph{from} suffix before the
 @emph{to} suffix.  Thus, @samp{movsbl %al, %edx} is AT&T syntax for
 ``move sign extend @emph{from} %al @emph{to} %edx.''  Possible suffixes,
 thus, are @samp{bl} (from byte to long), @samp{bw} (from byte to word),
 @samp{wl} (from word to long), @samp{bq} (from byte to quadruple word),
 @samp{wq} (from word to quadruple word), and @samp{lq} (from long to
 quadruple word).

? Now we have the same thing said in two places.

Jan