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The compiler will generate in-line 387-compatible numeric data processor
instructions into the object code for floating-point operations.  For 16-bit
applications, the use of this option will limit the range of systems on
which the application will run but there are execution performance
improvements.  For Watcom compilers generating 32-bit code, this option is
the default.  Use this option in conjunction with the "fpi" or "fpi87"
options.  The macro __SW_FP3 will be predefined if "fp3" is selected.