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(as.info)f

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Work Faster: `-f'
=================

   `-f' should only be used when assembling programs written by a
(trusted) compiler.  `-f' stops the assembler from doing whitespace and
comment preprocessing on the input file(s) before assembling them.
Note: Preprocessing.

     _Warning:_ if you use `-f' when the files actually need to be
     preprocessed (if they contain comments, for example), `as' does
     not work correctly.