GNU Info

(nasm.info)Section B.4.79

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B.4.79. `FFREE': Flag Floating-Point Register as Unused
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     FFREE fpureg                  ; DD C0+r              [8086,FPU]
     FFREEP fpureg                 ; DF C0+r              [286,FPU,UNDOC]

   `FFREE' marks the given register as being empty.

   `FFREEP' marks the given register as being empty, and then pops the
register stack.