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

Document different mnemonics of movsx, movsxd and movzx in AT&T syntax.

	PR gas/25438
	* doc/c-i386.texi: Document movsx, movsxd and movzx for AT&T
	syntax.
This commit is contained in:
H.J. Lu 2020-02-14 04:57:01 -08:00
parent a9b3453245
commit 0e6724dee4
2 changed files with 59 additions and 0 deletions
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6
gas/ChangeLog
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@ -1,3 +1,9 @@
2020-02-14 H.J. Lu <hongjiu.lu@intel.com>
PR gas/25438
* doc/c-i386.texi: Document movsx, movsxd and movzx for AT&T
syntax.
2020-02-13 Fangrui Song <maskray@google.com>
H.J. Lu <hongjiu.lu@intel.com>

53
gas/doc/c-i386.texi
View File

@ -835,6 +835,59 @@ are called @samp{cbtw}, @samp{cwtl}, @samp{cwtd}, @samp{cltd}, @samp{cltq}, and
@samp{cqto} in AT&T naming. @code{@value{AS}} accepts either naming for these
instructions.
@cindex extension instructions, i386
@cindex i386 extension instructions
@cindex extension instructions, x86-64
@cindex x86-64 extension instructions
The Intel-syntax extension instructions
@itemize @bullet
@item
@samp{movsx} --- sign-extend @samp{reg8/mem8} to @samp{reg16}.
@item
@samp{movsx} --- sign-extend @samp{reg8/mem8} to @samp{reg32}.
@item
@samp{movsx} --- sign-extend @samp{reg8/mem8} to @samp{reg64}
(x86-64 only).
@item
@samp{movsx} --- sign-extend @samp{reg16/mem16} to @samp{reg32}
@item
@samp{movsx} --- sign-extend @samp{reg16/mem16} to @samp{reg64}
(x86-64 only).
@item
@samp{movsxd} --- sign-extend @samp{reg32/mem32} to @samp{reg64}
(x86-64 only).
@item
@samp{movzx} --- zero-extend @samp{reg8/mem8} to @samp{reg16}.
@item
@samp{movzx} --- zero-extend @samp{reg8/mem8} to @samp{reg32}.
@item
@samp{movzx} --- zero-extend @samp{reg8/mem8} to @samp{reg64}
(x86-64 only).
@item
@samp{movzx} --- zero-extend @samp{reg16/mem16} to @samp{reg32}
@item
@samp{movzx} --- zero-extend @samp{reg16/mem16} to @samp{reg64}
(x86-64 only).
@end itemize
@noindent
are called @samp{movsbw/movsxb/movsx}, @samp{movsbl/movsxb/movsx},
@samp{movsbq/movsb/movsx}, @samp{movswl/movsxw}, @samp{movswq/movsxw},
@samp{movslq/movsxl}, @samp{movzbw/movzxb/movzx},
@samp{movzbl/movzxb/movzx}, @samp{movzbq/movzxb/movzx},
@samp{movzwl/movzxw} and @samp{movzwq/movzxw} in AT&T syntax.
@cindex jump instructions, i386
@cindex call instructions, i386
@cindex jump instructions, x86-64