gas/

2007-12-23  H.J. Lu  <hongjiu.lu@intel.com>

	* config/tc-i386.c (set_intel_mnemonic): New.
	(intel_mnemonic): Likewise.
	(old_gcc): Likewise.
	(OPTION_MMNEMONIC): Likewise.
	(OPTION_MSYNTAX): Likewise.
	(OPTION_MINDEX_REG): Likewise.
	(OPTION_MNAKED_REG): Likewise.
	(OPTION_MOLD_GCC): Likewise.
	(md_pseudo_table): Add .intel_mnemonic and .att_mnemonic.
	(match_template): Don't allow AT&T/Intel mnemonic if Intel/AT&T
	mnemonic is specified.  Don't allow old gcc support if old_gcc
	is 0.
	(md_longopts): Add -mmnemonic, -msyntax, -mindex-reg,
	-mmnaked-reg and -mold-gcc.
	(md_parse_option): Handle OPTION_MMNEMONIC, OPTION_MSYNTAX,
	OPTION_MINDEX_REG, OPTION_MNAKED_REG and OPTION_MOLD_GCC.

	* doc/c-i386.texi: Docoument -mmnemonic, -msyntax, --mnaked-reg
	and AT&T mnemonic vs. Intel mnemonic.

gas/testsuite/

2007-12-23  H.J. Lu  <hongjiu.lu@intel.com>

	* gas/i386/compat-intel.d: Pass -mmnemonic=att to assembler.
	* gas/i386/compat.d: Likewise.

	* gas/i386/i386.exp: Pass -mmnemonic=att to assembler for
	"float".  Pass -mold-gcc to assembler for  "general".

opcodes/

2007-12-23  H.J. Lu  <hongjiu.lu@intel.com>

	* i386-gen.c (opcode_modifiers): Add OldGcc, ATTMnemonic and
	IntelMnemonic.

	* i386-opc.h (OldGcc): New.
	(ATTMnemonic): Likewise.
	(IntelMnemonic): Likewise.
	(Opcode_Modifier_Max): Updated.
	(i386_opcode_modifier): Add oldgcc, attmnemonic and
	intelmnemonic.

	* i386-opc.tbl: Update fadd, fdiv, fdivp, fdivr, fdivrp, fmul,
	fsub, fsubp, fsubr and fsubrp with OldGcc, ATTMnemonic and
	IntelMnemonic.
	* i386-tbl.h: Regeneratd.

1 files changed, 40 insertions, 0 deletions

diff --git a/gas/doc/c-i386.texi b/gas/doc/c-i386.texi
index 869aff6..16640d2 100644
--- a/gas/doc/c-i386.texi
+++ b/gas/doc/c-i386.texi
@@ -119,6 +119,29 @@ generated.
 
 Valid @var{CPU} values are identical to @option{-march=@var{CPU}}.
 
+@cindex @samp{-mmnemonic=} option, i386
+@cindex @samp{-mmnemonic=} option, x86-64
+@item -mmnemonic=@var{att}
+@item -mmnemonic=@var{intel}
+This option specifies instruction mnemonic for matching instructions. 
+The @code{.att_mnemonic} and @code{.intel_mnemonic} directives will
+take precedent.
+
+@cindex @samp{-msyntax=} option, i386
+@cindex @samp{-msyntax=} option, x86-64
+@item -msyntax=@var{att}
+@item -msyntax=@var{intel}
+This option specifies instruction syntax when processing instructions. 
+The @code{.att_syntax} and @code{.intel_syntax} directives will
+take precedent.
+
+@cindex @samp{-mnaked-reg} option, i386
+@cindex @samp{-mnaked-reg} option, x86-64
+@item -mnaked-reg
+This opetion specifies that registers don't require a @samp{%} prefix.
+The @code{.att_mnemonic}, @code{.intel_mnemonic}, @code{.att_syntax} and
+@code{.intel_syntax} directives will take precedent.
+
 @end table
 
 @node i386-Syntax
@@ -297,6 +320,23 @@ Far call/jump instructions are @samp{lcall} and @samp{ljmp} in
 AT&T syntax, but are @samp{call far} and @samp{jump far} in Intel
 convention.
 
+@section AT&T Mnemonic versus Intel Mnemonic
+
+@cindex i386 mnemonic compatibility
+@cindex mnemonic compatibility, i386
+
+@code{@value{AS}} supports assembly using Intel mnemonic.
+@code{.intel_mnemonic} selects Intel mnemonic with Intel syntax, and
+@code{.att_mnemonic} switches back to the usual AT&T mnemonic with AT&T
+syntax for compatibility with the output of @code{@value{GCC}}.
+Either of these directives may have an optional argument, @code{prefix},
+or @code{noprefix} specifying whether registers require a @samp{%} prefix.
+Several x87 instructions, @samp{fadd}, @samp{fdiv}, @samp{fdivp},
+@samp{fdivr}, @samp{fdivrp}, @samp{fmul}, @samp{fsub}, @samp{fsubp},
+@samp{fsubr} and @samp{fsubrp},  are implemented in AT&T System V/386
+assembler with different mnemonics from those in Intel IA32 specification.
+@code{@value{GCC}} generates those instructions with AT&T mnemonic.
+
 @node i386-Regs
 @section Register Naming