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  Title:    Subtract Reversed
 
  Syntax:   FSUBR [dest,src]
            FSUBRP dest,ST
            FSUBR src
            FISUBR src
 
  See also: FSUB, FADD
 
  Description:
 
     Subtracts the destination operand from the source operand and
     returns the result in the destination operand. If two register
     operands are specified, one must be ST. If a memory operand is
     specified, the result replaces the value in ST. Memory operands
     can be 32- or 64-bit real numbers or 16- or 32-bit integers.
 
     If no operand is specified, ST(1) is subtracted from ST and the
     stack is popped; the difference is returned in ST. For FSUBRP, the
     source must be ST; the difference (source minus destination) is
     returned in the destination register and ST is popped.
                                    -♦-