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