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(nasm.info)Section B.4.110

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B.4.110. `FXCH': Floating-Point Exchange
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     FXCH                          ; D9 C9                [8086,FPU]
     FXCH fpureg                   ; D9 C8+r              [8086,FPU]
     FXCH fpureg,ST0               ; D9 C8+r              [8086,FPU]
     FXCH ST0,fpureg               ; D9 C8+r              [8086,FPU]

   `FXCH' exchanges `ST0' with a given FPU register. The no-operand
form exchanges `ST0' with `ST1'.