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(nasm.info)Section B.4.71

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B.4.71. `FCLEX', `FNCLEX': Clear Floating-Point Exceptions
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     FCLEX                         ; 9B DB E2             [8086,FPU]
     FNCLEX                        ; DB E2                [8086,FPU]

   `FCLEX' clears any floating-point exceptions which may be pending.
`FNCLEX' does the same thing but doesn't wait for previous floating-
point operations (including the _handling_ of pending exceptions) to
finish first.