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;========================================================================
;==     Name:           FDN                                            ==
;==     Operation:      Floating double negate                         ==
;==     Inputs:         EDX     high word of float                     ==
;==     Outputs:        EDX     new high word of float                 ==
;==     Volatile:       none                                           ==
;========================================================================
include mdef.inc
include struct.inc

        modstart        fdn386

        xdefp   __FDN

        defpe   __FDN
        test    EDX,EDX         ; if non zero number then
        _if     e
          test  EAX,EAX
        _endif
        _if     ne              ; ...
          xor   EDX,80000000h   ; - flip the sign bit
        _endif                  ; endif
        ret                     ; and return!!!
        endproc __FDN

        endmod
        end