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(nasm.info)Section B.4.97

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B.4.97. `FSAVE', `FRSTOR': Save/Restore Floating-Point State
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     FSAVE mem                     ; 9B DD /6             [8086,FPU]
     FNSAVE mem                    ; DD /6                [8086,FPU]

     FRSTOR mem                    ; DD /4                [8086,FPU]

   `FSAVE' saves the entire floating-point unit state, including all the
information saved by `FSTENV' (*Note Section B.4.104::) plus the
contents of all the registers, to a 94 or 108 byte area of memory
(depending on the CPU mode). `FRSTOR' restores the floating-point state
from the same area of memory.

   `FNSAVE' does the same as `FSAVE', without first waiting for pending
floating-point exceptions to clear.