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Instruction prefixes

The following prefixes are available as pseudo instructions coded on the line above :

REP
REPE
REPNE
FS ;Appends the FS: prefix
GS ;Appends the GS: prefix

For example:

FS ;Source operand from FS
REP
MOVSB

or

MOV FS:0,ESP%

would be coded as

FS
MOV 0,ESP%

Other prefixes are rarely needed, however they are available using the DB pseudo instruction to code an arbitrary byte. For example the CS: prefix could be coded as:

DB Z'0E'

 

 

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