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(nasm.info)Section B.4.109

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B.4.109. `FXAM': Examine Class of Value in `ST0'
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     FXAM                          ; D9 E5                [8086,FPU]

   `FXAM' sets the FPU flags `C3', `C2' and `C0' depending on the type
of value stored in `ST0':

      Register contents     Flags

      Unsupported format    000
      NaN                   001
      Finite number         010
      Infinity              011
      Zero                  100
      Empty register        101
      Denormal              110

   Additionally, the `C1' flag is set to the sign of the number.