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When a source file is compiled by Watcom C/C++ with one of the "fpi" or
"fpi87" options, all floating-point arguments are passed on the 80x86 stack.
 The rules for passing arguments are as follows.

 1. If the argument is not floating-point, use the procedure described
    earlier in this chapter.

 2. If the argument is floating-point, it is assigned a position on the
    80x86 stack.