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It is possible to force arguments into specific registers.  Suppose you have
a function, say "mycopy", that copies data.  The first argument is the
source, the second argument is the destination, and the third argument is
the length to copy.  If we want the first argument to be passed in the
register SI, the second argument to be passed in register DI and the third
argument to be passed in register CX, the following auxiliary pragma can be
used.


     void mycopy( char near *, char *, int );
     #pragma aux mycopy parm [DI] [SI] [CX];

Note that you must be aware of the size of the arguments to ensure that the
arguments get passed in the appropriate registers.