PACIBSPPC Pointer Authentication Code for return 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 X30. The first modifier is in SP. The second modifier is the value of PC. A PACIBSPPC instruction has an implicit BTI instruction. The implicit BTI instruction of a PACIBSPPC instruction is always compatible with PSTATE.BTYPE == 0b01 and PSTATE.BTYPE == 0b10. Controls in SCTLR_ELx configure whether the implicit BTI instruction of a PACIBSPPC instruction is compatible with PSTATE.BTYPE == 0b11. For more information, see PSTATE.BTYPE. 1 1 0 1 1 0 1 0 1 1 0 0 0 0 0 1 1 0 1 0 0 1 1 1 1 1 1 1 1 1 1 0 PACIBSPPC if !IsFeatureImplemented(FEAT_PAuth_LR) then EndOfDecode(Decode_UNDEF); end; let d : integer = 30; if IsFeatureImplemented(FEAT_BTI) then // Check for branch target compatibility between PSTATE.BTYPE // and implicit branch target of PACIxSPPC instruction. let pacinst : PACInstType = PACIxSPPC; SetBTypeCompatible(BTypeCompatible_PAC(pacinst)); end; X{64}(d) = AddPACIB2(X{64}(d), SP{64}(), PC64()); 2026-03-12 12:23:09 2025-09_rel_asl1