Load unprivileged pair of registers
This instruction calculates an address from a base register value and an immediate offset, loads two 64-bit doublewords from memory, and writes them to two registers.
Explicit Memory effects produced by the instruction behave as if the instruction was executed at EL0 if the Effective value of PSTATE.UAO is 0 and either:
Otherwise, the Explicit Memory effects operate with the restrictions determined by the Exception level at which the instruction is executed.
For information about addressing modes, see Load/Store addressing modes.
It has encodings from 3 classes: Post-index , Pre-index and Signed offset
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | imm7 | Rt2 | Rn | Rt | ||||||||||||||||||
| opc | VR | L | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_LSUI) then EndOfDecode(Decode_UNDEF); end; var wback : boolean = TRUE; let postindex : boolean = TRUE;
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 1 | 1 | imm7 | Rt2 | Rn | Rt | ||||||||||||||||||
| opc | VR | L | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_LSUI) then EndOfDecode(Decode_UNDEF); end; var wback : boolean = TRUE; let postindex : boolean = FALSE;
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 1 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | imm7 | Rt2 | Rn | Rt | ||||||||||||||||||
| opc | VR | L | |||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_LSUI) then EndOfDecode(Decode_UNDEF); end; var wback : boolean = FALSE; let postindex : boolean = FALSE;
LDTP has the same CONSTRAINED UNPREDICTABLE behavior as LDP. See Architectural Constraints on UNPREDICTABLE behaviors, and particularly LDP.
| <Xt1> |
Is the 64-bit name of the first general-purpose register to be transferred, encoded in the "Rt" field. |
| <Xt2> |
Is the 64-bit name of the second general-purpose register to be transferred, encoded in the "Rt2" field. |
| <Xn|SP> |
Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. |
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{} = 64; 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 = AArch64_IsUnprivAccessPriv(); 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{datasize}(t) = data1; X{datasize}(t2) = 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;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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