MMX instruction that compares 2
64 bit values for
inequality, bytewise. There is no "PCMPLT?" instruction, because you can just flip the order of the operands to the "PCMPGT?" instructions.
Note: unlike integer comparison operators, MMX comparison operators do not affect any
flags.
Each byte of the destination register is set to
all 1's if it was greater than the
corresponding byte of the source register. Otherwise, it is set to all zeros.
See also:
PCMPGTB,
PCMPEQW,
PCMPEQD