(thing) by novalis Thu Apr 20 2000 at 12:42:36
MMX instruction to subtract packed bytes with signed saturation.

A MMX register or 64 bit memory location is subtracted from to a MMX register, byte-wise. Bytes below -128 are clamped to -128.

Compare PSUBSW, PSUBSD, PSUBUSB, PSUBB.
I like it!