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The compiler will generate in-line 80x87 numeric data processor instructions
into the object code for floating-point operations.  The sequence of
floating-point instructions will be optimized for greatest possible
performance on the Intel Pentium processor.  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.  Use this option
in conjunction with the "fpi" or "fpi87" options.  The macro __SW_FP5 will
be predefined if "fp5" is selected.