let t : integer{} = UInt(Rt); let t2 : integer{} = UInt(Rt2); let n : integer{} = UInt(Rn); let nontemporal : boolean = FALSE; let scale : integer{} = 2 + UInt(opc[1]); let datasize : integer{} = 32; let offset : bits(64) = LSL(SignExtend{64}(imm7), scale); let tagchecked : boolean = wback || n != 31; var rt_unknown : boolean = FALSE; var wb_unknown : boolean = FALSE; if wback && (t == n || t2 == n) && n != 31 then let c : Constraint = ConstrainUnpredictable(Unpredictable_WBOVERLAPLD); assert c IN {Constraint_WBSUPPRESS, Constraint_UNKNOWN, Constraint_UNDEF, Constraint_NOP}; case c of when Constraint_WBSUPPRESS => wback = FALSE; // Writeback is suppressed when Constraint_UNKNOWN => wb_unknown = TRUE; // Writeback is UNKNOWN when Constraint_UNDEF => EndOfDecode(Decode_UNDEF); when Constraint_NOP => EndOfDecode(Decode_NOP); end; end; if t == t2 then let c : Constraint = ConstrainUnpredictable(Unpredictable_LDPOVERLAP); assert c IN {Constraint_UNKNOWN, Constraint_UNDEF, Constraint_NOP}; case c of when Constraint_UNKNOWN => rt_unknown = TRUE; // Result is UNKNOWN when Constraint_UNDEF => EndOfDecode(Decode_UNDEF); when Constraint_NOP => EndOfDecode(Decode_NOP); end; end;

var address : bits(64); var data1 : bits(datasize); var data2 : bits(datasize); let dbytes : integer{} = datasize DIV 8; let privileged : boolean = PSTATE.EL != EL0; let ispair : boolean = TRUE; let accdesc : AccessDescriptor = CreateAccDescGPR(MemOp_LOAD, nontemporal, privileged, tagchecked, ispair, t, t2); if n == 31 then CheckSPAlignment(); address = SP{64}(); else address = X{64}(n); end; if !postindex then address = AddressAdd(address, offset, accdesc); end; let data : bits(2*datasize) = Mem{2*datasize}(address, accdesc); if rt_unknown then data1 = ARBITRARY : bits(datasize); data2 = ARBITRARY : bits(datasize); elsif BigEndian(accdesc.acctype) then data2 = data[(datasize-1):0]; data1 = data[(2*datasize-1):datasize]; else data1 = data[(datasize-1):0]; data2 = data[(2*datasize-1):datasize]; end; X{64}(t) = SignExtend{64}(data1); X{64}(t2) = SignExtend{64}(data2); if wback then if wb_unknown then address = ARBITRARY : bits(64); elsif postindex then address = AddressAdd(address, offset, accdesc); end; if n == 31 then SP{64}() = address; else X{64}(n) = address; end; end;