5.29) Explain what the following fragment of code achieves. Note that the data is signed and...

5.29) Explain what the following fragment of code achieves. Note that the data is signed and that the packed shift right arithmetic instruction operates on word (16-bit) operands.

MOVQ MM0, MM1

PSRAW MM0, 15

PXOR MM0, MM1

5.30) Consider the following block of operations that might be found inside a loop. Explainf what the instructions do and what operation is being performed on the data.

MOVQ MM1, A ; move 8 pixels of image A

MOVQ MM2, B ; move 8 pixels of image B

MOVQ MM3, MM1

PSUBSB MM1, MM2

PSUBSB MM2, MM3

POR MM1, MM2

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Manojponduru answered 1 year ago

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