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This section deals with those aspects of auxiliary pragmas that are specific
to the 80x87.  The discussion in this chapter assumes that one of the "fpi"
or "fpi87" options is used to compile functions.  The following areas are
affected by the use of these options.

 1. passing floating-point arguments to functions,

 2. returning floating-point values from functions and

 3. which 80x87 floating-point registers are allowed to be modified by the
    called routine.