MMX instruction to unpack
packed dwords to a
packed quadword.
This instruction interleaves the bottom
double word of the source (a
MMX register or
64 bit memory location) into the lower dword of the destination (a MMX register). Example: if the source consists of abcdefgh and the destination contains stuvwxyz, the new destination contents are efghwxyz.
Compare:
PUNPCKLBW,
PUNPCKLWD