MMX instruction to unpack packed bytes to packed words.
This instruction interleaves the low 4 bytes of the source (a MMX register or 64 bit memory location) into the bottom half of the destination (a MMX register). Example: if the source consists of abcdefgh and the destination contains stuvwxyz, the new destination contents are ewfxgyhz.

Compare: PUNPCKLWD, PUNPCKLDQ

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