Electrical computers: arithmetic processing and calculating – Electrical digital calculating computer – Particular function performed
Reexamination Certificate
2008-02-26
2011-11-01
Mai, Tan V (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical digital calculating computer
Particular function performed
Reexamination Certificate
active
08051116
ABSTRACT:
A method for executing an MMX PSADBW instruction by a microprocessor. The method includes generating packed differences of packed operands of the instruction and generating borrow bits associated with each of the packed differences; for each of the packed differences: determining whether the borrow bit indicates the packed difference is positive or negative and selecting a value in response to the determining, the value comprising the packed difference if the associated borrow bit is positive and a complement of the packed difference if the associated borrow bit is negative; adding the selected values to generate a first sum and a first carry and in parallel adding the borrow bits to generate a second sum and a second carry; adding the first and second sums and the first and second carries to generate a result of the instruction; storing the result in a register of the microprocessor.
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Johnson Daniel W. J.
Loper Albert J.
Davis E. Alan
Huffman James W.
Mai Tan V
VIA Technologies Inc.
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