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

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in Microprocessor by (39.4k points)
In a preemptive multitasking O.S., the saving and restoring of FP and MMX states are performed by

(a) Control unit

(b) O.S.

(c) MMX instructions

(d) MMX registers

This question was posed to me in an interview for job.

I'm obligated to ask this question of MMX Data Types, Wrap-around and Saturation Arithmetic, Multimedia Application Programming, Pentium III (P-III) CPU topic in portion Recent Advancements in Microprocessor Architecture of Microprocessor

1 Answer

0 votes
by (49.2k points)
The correct answer is (b) O.S.

The best I can explain: 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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