In a preemptive multitasking O.S., the saving and restoring of FP and MMX states are performed by

In a preemptive multitasking O.S., the saving and restoring of FP and MMX states are performed by Correct Answer O.S.

In a preemptive multitasking O.S., the application does not know when it is preemptied. It is the job of the O.S. to save and restore the FP and MMX states, when performing a context switch. Thus the user need not save or restore the state.
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