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| author | H.J. Lu <hjl.tools@gmail.com> | 2020-02-14 04:57:01 -0800 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2020-02-14 04:57:16 -0800 |
| commit | 0e6724dee4984e62e2f8e7da431f3b875ab14c4a (patch) | |
| tree | ac635ca3a65ad2431a774e8f44d138905c050ec5 /gas | |
| parent | a9b34532453a065991b32f15055adf76fa86ff8c (diff) | |
| download | gdb-0e6724dee4984e62e2f8e7da431f3b875ab14c4a.zip gdb-0e6724dee4984e62e2f8e7da431f3b875ab14c4a.tar.gz gdb-0e6724dee4984e62e2f8e7da431f3b875ab14c4a.tar.bz2 | |
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.
Diffstat (limited to 'gas')
| -rw-r--r-- | gas/ChangeLog | 6 | ||||
| -rw-r--r-- | gas/doc/c-i386.texi | 53 |
2 files changed, 59 insertions, 0 deletions
diff --git a/gas/ChangeLog b/gas/ChangeLog index 8d5426d..67d1379 100644 --- a/gas/ChangeLog +++ b/gas/ChangeLog @@ -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> diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi index 4eaf533..ba0df76 100644 --- a/gas/doc/c-i386.texi +++ b/gas/doc/c-i386.texi @@ -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 |