as: Fill

 
 7.36 '.fill REPEAT , SIZE , VALUE'
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 REPEAT, SIZE and VALUE are absolute expressions.  This emits REPEAT
 copies of SIZE bytes.  REPEAT may be zero or more.  SIZE may be zero or
 more, but if it is more than 8, then it is deemed to have the value 8,
 compatible with other people's assemblers.  The contents of each REPEAT
 bytes is taken from an 8-byte number.  The highest order 4 bytes are
 zero.  The lowest order 4 bytes are VALUE rendered in the byte-order of
 an integer on the computer 'as' is assembling for.  Each SIZE bytes in a
 repetition is taken from the lowest order SIZE bytes of this number.
 Again, this bizarre behavior is compatible with other people's
 assemblers.
 
    SIZE and VALUE are optional.  If the second comma and VALUE are
 absent, VALUE is assumed zero.  If the first comma and following tokens
 are absent, SIZE is assumed to be 1.