FNCLEX            Clear Exceptions (No-wait)  Exception Flags: None

FNCLEX

       Logic:      clears exception flags

     FNCLEX is the no-wait form of FCLEX. It clears all the exception flags,
     the busy flag, and bit 7 in the status word. (Bit 7 is the interrupt
     request flag in the 8087 and the error status flag in the 80287 and
     80387.)

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   Operands            Clocks         Bytes           Example
   FNCLEX              2-8              3             FNCLEX
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        Note:          You should use this no-wait form of the instrcution
                       only when there is a danger of generating an infinite
                       wait condition.