MMX instruction to add packed words with
signed saturation.
A
MMX register or 64 bit memory location is added to a MMX register, word-wise, with signed saturation. Word values which would be over
32767 are clamped to 32767; word values under -
32768 are clamped to -32768.
Compare
PADDSB,
PADDW,
PADDSD,
PADDUSW.