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
MOVQ MM0,MM1 ;Copy MM1 to MM0
PSRAW MM0,15 ;Shift the value(s) in MM0 15 places right (fill each word with sign bits)
PXOR MM1,MM0 ;Perform an exclusive OR between MM1 and the flag words.
;Words that were negative in MM1 will be inverted.
;Positive words will be unchanged.
Computer Science & Information Technology
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