Method and system for performing parallel integer multiply accumulate operations on packed data
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United States of America Patent
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May 11, 2010
Grant Date -
Oct 20, 2005
app pub date -
Jun 16, 2005
filing date -
Jul 31, 2003
priority date (Note) -
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Abstract
A multiply accumulate unit (“MAC”) that performs operations on packed integer data. In one embodiment, the MAC receives 2 32-bit data words which, depending on the specified mode of operation, each contain either four 8-bit operands, two 16-bit operands, or one 32-bit operand. Depending on the mode of operation, the MAC performs either sixteen 8×8 operations, four 16×16 operations, or one 32×32 operation. Results may be individually retrieved from registers and the corresponding accumulator cleared after the read cycle. In addition, the accumulators may be globally initialized. Two results from the 8×8 operations may be packed into a single 32-bit register. The MAC may also shift and saturate the products as required.
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