integer n = UInt(Rn); integer t = UInt(Rt); integer t2 = UInt(Rt2); AccType acctype = AccType_STREAM; MemOp memop = if L == '1' then MemOp_LOAD else MemOp_STORE; if opc<0> == '1' then UNDEFINED; integer scale = 2 + UInt(opc<1>); integer datasize = 8 << scale; bits(64) offset = LSL(SignExtend(imm7, 64), scale); boolean tag_checked = wback || n != 31; boolean rt_unknown = FALSE; if memop == MemOp_LOAD && t == t2 then Constraint c = 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 UNDEFINED; when Constraint_NOP EndOfInstruction();

bits(64) address; bits(datasize) data1; bits(datasize) data2; constant integer dbytes = datasize DIV 8; if HaveMTE2Ext() then SetTagCheckedInstruction(tag_checked); if n == 31 then CheckSPAlignment(); address = SP[]; else address = X[n]; if ! postindex then address = address + offset; case memop of when MemOp_STORE if rt_unknown && t == n then data1 = bits(datasize) UNKNOWN; else data1 = X[t]; if rt_unknown && t2 == n then data2 = bits(datasize) UNKNOWN; else data2 = X[t2]; Mem[address + 0 , dbytes, acctype] = data1; Mem[address + dbytes, dbytes, acctype] = data2; when MemOp_LOAD if HaveLSE2Ext() then bits(2*datasize) full_data; boolean ispair = TRUE; full_data = Mem[address, 2 * dbytes, AccType_NORMAL, ispair]; if BigEndian(acctype) then data2 = full_data<(datasize-1) : 0>; data1 = full_data<(2*datasize-1) : datasize>; else data1 = full_data<(datasize-1) : 0>; data2 = full_data<(2*datasize-1) : datasize>; else data1 = Mem[address + 0 , dbytes, acctype]; data2 = Mem[address + dbytes, dbytes, acctype]; if rt_unknown then data1 = bits(datasize) UNKNOWN; data2 = bits(datasize) UNKNOWN; X[t] = data1; X[t2] = data2; if wback then if postindex then address = address + offset; if n == 31 then SP[] = address; else X[n] = address;