LDTNP

Load unprivileged pair of registers, with non-temporal hint

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. For information about addressing modes, see Load/Store addressing modes. For information about non-temporal pair instructions, see Load/Store non-temporal pair.

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:

• The instruction is executed at EL1.
• The instruction is executed at EL2 when the Effective value of HCR_EL2().{E2H, TGE} is '11'.

Otherwise, the Explicit Memory effects operate with the restrictions determined by the Exception level at which the instruction is executed.

Signed offset
(FEAT_LSUI)

Decode for this encoding

if !IsFeatureImplemented(FEAT_LSUI) then EndOfDecode(Decode_UNDEF); end; let t : integer{} = UInt(Rt); let t2 : integer{} = UInt(Rt2); let n : integer{} = UInt(Rn); let nontemporal : boolean = TRUE; let datasize : integer{} = 64; let offset : bits(64) = LSL(SignExtend{64}(imm7), 3); let tagchecked : boolean = n != 31; var rt_unknown : boolean = FALSE; 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;

Assembler Symbols