This instruction Skips the next half-words if the register is Not Zero.
A 2-bit field located in SRC2 contains the Skip Length, which is incremented to fit a value between 1 and 4 half-words, beginning after the skip instruction.
The Imm16 field is used to XOR the register with a sign-extended 16-bit immediate value, so the register can also be tested for inequality with a 16-bit value.
This is one of the instructions of the SKIP group, see also : SKIP, SZ, SO/SNE/SNO/SE, SS/SNS.