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Instruction mmx - PCMPGTB/PCMPGTW/PCMPGTD—Packed Compare for Greater Than

Compare the individual signed data elements (bytes, words, or doublewords) in the destination operand (first operand) to the corresponding signed data elements in the source operand (second operand). If a data element in the destination operand is greater than its corresponding data element in the source operand, the data element in the destination operand is set to all ones; otherwise, it is set to all zeros. The destination operand must be an MMX technology register; the source operand may be either an MMX technology register or a 64-bit memory location. The PCMPGTB instruction compares the signed bytes in the destination operand to the corresponding signed bytes in the source operand, with the bytes in the destination operand being set according to the results. The PCMPGTW instruction compares the signed words in the destination operand to the corresponding signed words in the source operand, with the words in the destination operand being set according to the results. The PCMPGTD instruction compares the signed doublewords in the destination operand to the corresponding signed doublewords in the source operand, with the doublewords in the destination operand being set according to the results.