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Instruction mmx - PCMPEQB/PCMPEQW/PCMPEQD—Packed Compare for Equal

Compares the individual data elements (bytes, words, or doublewords) in the destination operand (first operand) to the corresponding data elements in the source operand (second operand). If a pair of data elements are equal, the corresponding 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 PCMPEQB instruction compares the bytes in the destination operand to the corresponding bytes in the source operand, with the bytes in the destination operand being set according to the results. The PCMPEQW instruction compares the words in the destination operand to the corresponding words in the source operand, with the words in the destination operand being set according to the results. The PCMPEQD instruction compares the doublewords in the destination operand to the corresponding doublewords in the source operand, with the doublewords in the destination operand being set according to the results.