Opmask register instructions

*1 or test: Calculate (k1 | k2). If all bits are ZEROs, set ZF. If all bits are ONEs, set CF.

*2 test: If all bits of (k1 & k2) are ZEROs, set ZF. If all bits of ((~k1) & k2) are ZEROs, set CF.

*3 unpack: Concatinate lower n-bit of k2 and lower n-bit of k3, set the double length bits to the lower bits of k1. (The bits from k2 comes upper.)

Upper bits of the destination K register are zeroed.

TIP: xnor instruction can be used for setting all bits. (Specify one K register for all 3 operands.)