F2XM1             2 to the X Power - 1        Exception Flags: None

F2XM1
                         ST
       Logic:      ST . 2   - 1


     F2MX1 calculates 2 to the power X and subtracts 1 from the result. X is
     taken from ST and must be 0 . X . .5 on the 8087 and 80287, or -1.0 . X
     . 1.0 on the 80387.
                                                        X
     This instruction provides increased accuracy over 2  when X is near 0
     (for example, when you calculate hyperbolic trignometric functions).

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   Operands            Clocks         Bytes           Example
   F2XM1               310-630          3             F2XM1
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                                  X
        Note:          To obtain 2  , add 1 to the result of F2XM1.