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/usr/share/intel2gas/i2g/main.syntax is in intel2gas 1.3.3-16+b2.

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The actual contents of the file can be viewed below.

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#  Try to put the more specialized forms before the
#  general ones
#
#  Look in file DATAFILES for more info about <tag>s.

General settings:
@src_comment0=;
@dst_comment0=\#
-
# Single instructions that don't need converting or extending
<op:32>
<op>
-

# cmps,lods,movs,stos,iret...  size extended
<op:20>d
<op>l
-
<op:20><text>
<op><text>
-

# unused: aad aam
<op:02> <@><mathnum>
<op> <@>$<mathnum>
-

#pushfd, popfd
p<text>fd
p<text>f
-

#shl&shr , 1 
<op:08> <@><size> [ <address>] , 1
<op><m> <@><address>
-
<op:08> <@><reg> , 1
<op><r> <@>%<reg>
-

# movsx & movzx
mov<text>x <@><reg1> , <reg2>
mov<text><r><r-1> <@>%<reg2>,%<reg1>
-
mov<text>x <@><reg> , <size> [ <address>]
mov<text><m><r> <@><address>,%<reg>
-
mov<text>x <@><reg> , [ <address>]
mov<text><m><r> <@><address>,%<reg>
-

enter <@><mathnum1>, <mathnum2>
enter <@>$<mathnum2>,$<mathnum1>
-

# Some mmx routines (and other that don't need the b/w/l extension)
# can use either op:04 or reg:10
<op:04> <@><reg:10> , [ <address>]
<op> <@><address>,%<reg>
-
<op:04> <@><reg> , <size> [ <address>]
<op> <@><address>,%<reg>
-
<op:04> <@><size> [ <address>] , <reg>
<op> <@>%<reg>,<address>
-
<op:04> <@>[ <address>] , <reg>
<op> <@>%<reg>,<address>
-
<op:04> <@><reg1> , <reg2>
<op> <@>%<reg2>,%<reg1>
-
<op:04> <@><reg> , <mathnum>
<op> <@>$<mathnum>,%<reg>
-
<op:04> <@><reg> , <text>+ <mathnum>
<op> <@>$<text>+<mathnum>,%<reg>
-
<op:04> <@><reg:10> , <size> <text>
<op> <@>$<text>,%<reg>
-
<op:04> <@><reg:10> , <text>
<op> <@>$<text>,%<reg>
-
<op:04> <@><size> <text>, <reg:10>
<op> <@>%<reg>,$<text>
-
<op:04> <@><reg:10>
<op> <@>%<reg>
-
<op:04> <@>[ <address>]
<op> <@><address>
-

# Some fpu (op:10) routines.
<op:10> <@><size> [ <address>]
<op><m> <@><address>
-
<op:10> <@>[ <address>]
<op> <@><address>
-
<op:10> <@><reg>
<op> <@>%<reg>
-
<op:10> <@><fpureg>
<op> <@>%<fpureg>
-
<op:10> <@><fpureg1>, <fpureg2>
<op> <@>%<fpureg2>,%<fpureg1>
-
<op:10> <@><size> <text>
<op> <@><text>
-
<op:10> <@><text>
<op> <@>$<text>
-

# three op instructions
<op> <@><reg1>, <reg2>, <mathnum>
<op><r-1> <@>$<mathnum>,%<reg2>,%<reg1>
-
<op> <@><reg1>, <reg2>, <reg3>
<op><r-2> <@>%<reg3>,%<reg2>,%<reg1>
-
<op> <@><size> [ <address>] , <reg>, <mathnum>
<op><m> <@>$<mathnum>,%<reg>,<address>
-


# normal instructions
<op> <@><size> [ <address>]
<op><m> <@><address>
-
<op> <@><reg> , [ <address>]
<op><r> <@><address>,%<reg>
-
<op> <@><reg> , <size> [ <address>]
<op><r> <@><address>,%<reg>
-
<op> <@>[ <address>] , <size> <mathnum>
<op><m> <@>$<mathnum>,<address>
-
<op> <@><size> [ <address>] , <size> <mathnum>
<op><m-1> <@>$<mathnum>,<address>
-
<op> <@><size> [ <address>] , <mathnum>
<op><m-1> <@>$<mathnum>,<address>
-
<op> <@>[ <address>] , <reg>
<op><r> <@>%<reg>,<address>
-

<op> <@><reg1> , <reg2>
<op><r> <@>%<reg2>,%<reg1>
-
<op> <@><reg> , <size> <mathnum>
<op><r> <@>$<mathnum>,%<reg>
-
<op> <@><reg> , <mathnum>
<op><r> <@>$<mathnum>,%<reg>
-

# Simple instructions
<op> <@><size> [ <address>]
<op><m> <@><address>
-
<op> <@><size> <mathnum>
<op><m> <@>$<mathnum>
-
<op> <@><mathnum>
<op>l <@>$<mathnum>
-
<op> <@><reg>
<op><r> <@>%<reg>
-

# rep instructions
<@>rep <text>d
<@>rep\n<@><text>l
-
<@>rep <text>
<@>rep\n<@><text>
-

# set flag->register
set<text> <@><reg>
set<text>b <@>%<reg>
-
set<text> <@>[ <address>]
set<text>b <@><address>
-

# Jump instructions to local & general variables (gcc generated code)
<jump> L<dec>
<jump> .L<dec>
-
# Jump/loop/call instructions to local & general variables
<jump> <@>.<text>
<jump> <@><label>.<text>
-
<jump> <@>[ <address>]
<jump> <@>*<address>
-
<jump> <@><discard> .<text>
<jump> <@><label>.<text>
-
<jump> <@><discard> <text>
<jump> <@><text>
-
<jump> <@>FAR <mathnum1>:<mathnum2>
l<jump> <@><mathnum1>,<mathnum2>
-
<jump> <@>FAR [ <address>]
l<jump> <@>*<address>
-
<jump> <@><reg>
<jump> <@>*%<reg>
-
<jump> <@><text>
<jump> <@><text>
-

# Miscallenous other opcodes
retf
lret
-
retf <@><mathnum>
lret <@>$<mathnum>
-
cbw
cbtw
-
cwd
cwtd
-
cdq
cltd
-
cwde
cwtl
-
xlatb
xlat
-
wait
fwait
-

# These are the last resort. 
# The text is assumed to be a variable name
<op> <@><reg> , <text>
<op><r> <@>$<text>, %<reg>
-
<op:04> <@><text>, <reg>
<op> <@>%<reg>, $<text>
-
<op> <@><text>, <reg>
<op><r> <@>%<reg>, $<text>
-

# Labels: convert local labels to lastbiglabel.locallabel
# The <more> allows an instruction be placed on the same line

# gcc generated label
L<dec>: <@><more>
.L<dec>: <@><more>
-

.<text>: <@><more>
<label>.<text>: <@><more>
-
.<text> <@><more>
<label>.<text>: <@><more>
-
<text>: <@><more>
@label=<text>
<label>: <@><more>
-

# some used prefixes
LOCK <@><more>
lock <@><more>
-
A16 <@><more>
addr16 <@><more>
-

# Some special directives
BITS <num>
SKIPLINE
-
# Can someone help with this one
GLOBAL <@><text>:function
.global <@><text>
-
GLOBAL <@><text>
.global <@><text>
-
COMMON <@><text> <num>
.comm <@><text>,<num>
-
COMMON <@><text> <num1>: <num2>
.comm <@><text>,<num1>,<num2>
-
EXTERN <@><text>
.extern <@><text>
-
SECTION <text>
<text>
-
SEGMENT <text>
<text>
-
RESD <text>
.space <text>*4
-
ALIGN <num1>, db <num2>
.align <num1>, <num2>
-
ALIGN <num>
.align <num>
-

# more directives
%include '<text>'
\#include "<text>"
-
%include "<text>"
\#include "<text>"
-
%define <@><text> <mathnum>
.equ <text>, <mathnum>
-
%define <@><text1> <text2>
.equ <@><text1>, <text2>
-
<text> <@1>equ <@2><mathnumber>
.equ <@1><text>, <@2><mathnumber>
-
<text1> <@1>equ <@2><text2>
.equ <@1><text1>, <@2><text2>
-
%if
.if
-
%endif
.endif
-
%ifdef <@><text>
.ifdef <@><text>
-
# data initialization
<data> <numlist>
.<dtype> <numlist>
-

# string constants
db <@>'<string>' , 0
.asciz <@>"<string>"
-
db <@>'<string>' , <num>
.ascii <@>"<string>"\n.byte <@><num>
-
db <@>'<string>'
.ascii <@>"<string>"
-