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(nasm.info)Section B.4.66

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B.4.66. `F2XM1': Calculate 2**X-1
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     F2XM1                         ; D9 F0                [8086,FPU]

   `F2XM1' raises 2 to the power of `ST0', subtracts one, and stores
the result back into `ST0'. The initial contents of `ST0' must be a
number in the range -1.0 to +1.0.