Consider the following block of operations that might be found inside a loop. Explain 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
The following contains the commented code.
MOVQ MM1,A ;move 8 pixels of image A
MOVQ MM2,B ;move 8 pixels of image B
MOVQ MM3,MM1 ;save copy of A in MM3
PSUBSB MM1,MM2 ;subtract A - B using saturating arithmetic
PSUBSB MM2,MM3 ;subtract B - A using saturating arithmetic
POR MM1,MM2 ;OR (A - B) with (B - A)
The effect of saturating arithmetic is to clamp a result at its minimum or maximum. In this case, the operation is
subtraction and one of A ? B or B ? A must be negative and will therefore be clamped at 0. ORing the two results
together will OR (A ? B) with 0 or (B ? A) with 0. Consequently, the result will be the modulus of the difference
between A and B; that is |A ? B|.
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