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The instruction of MMX that is essential when a floating-point routine calls an MMX routine or viceversa is

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The instruction of MMX that is essential when a floating-point routine calls an MMX routine or viceversa is

(a) MOV

(b) PADD

(c) EMMS

(d) None of the mentioned

This question was posed to me in examination.

Enquiry is from MMX Data Types, Wrap-around and Saturation Arithmetic, Multimedia Application Programming, Pentium III (P-III) CPU in portion Recent Advancements in Microprocessor Architecture of Microprocessor

1 Answer

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by (49.2k points)
Right choice is (c) EMMS

To explain I would say: The EMMS instruction is imperative when a floating point routine calls an MMX routine or vice-versa. If we do not use EMMS at the end of MMX routine, subsequent floating-point instructions will produce erratic results.

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