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Instruction mmx - PACKUSWB—Pack with Unsigned Saturation

Packs and saturates 4 signed words from the destination operand (first operand) and 4 signed words from the source operand (second operand) into 8 unsigned bytes in the destination operand. If the signed value of a word is beyond the range of an unsigned byte (that is, greater than FFH or less than 00H), the saturated byte value of FFH or 00H, respectively, is stored into the destination. The destination operand must be an MMX technology register; the source operand may be either an MMX technology register or a quadword memory location.