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When the instruction, PMULHW, is performed, then the higher order 16-bits of the 32 bit products are stored in

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When the instruction, PMULHW, is performed, then the higher order 16-bits of the 32 bit products are stored in

(a) source operand

(b) destination operand

(c) no storage of lower order

(d) either source or destination

I have been asked this question in exam.

The question is from MMX Instruction Set topic in chapter Recent Advancements in Microprocessor Architecture of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (b) destination operand

To elaborate: In the instruction, PMULHW, four 16 X 16 multiplications are performed, and the higher order 16 bits of the 32-bit products are stored in destination.

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