PACIB171615 Pointer Authentication Code for instruction address, using key B This instruction computes and inserts a pointer authentication code for an instruction address, using two modifiers and key B. The address is in X17. The 64-bit value of modifier1 is the value in X16. The 64-bit value of modifier2 is the value in X15. 1 1 0 1 1 0 1 0 1 1 0 0 0 0 0 1 1 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 PACIB171615 if !IsFeatureImplemented(FEAT_PAuth_LR) then UNDEFINED; X[17, 64] = AddPACIB2(X[17, 64], X[16, 64], X[15, 64]);