LDUR (SIMD&FP) Load SIMD&FP register (unscaled offset) This instruction loads a SIMD&FP register from memory. The address that is used for the load is calculated from a base register value and an optional immediate offset. Depending on the settings in the CPACR_EL1, CPTR_EL2, and CPTR_EL3 registers, and the current Security state and Exception level, an attempt to execute the instruction might be trapped. If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored. 1 1 1 1 0 0 x 1 0 0 0 0 0 0 LDUR <Bt>, [<Xn|SP>{, #<simm>}] 0 1 0 LDUR <Ht>, [<Xn|SP>{, #<simm>}] 1 0 0 LDUR <St>, [<Xn|SP>{, #<simm>}] 1 1 0 LDUR <Dt>, [<Xn|SP>{, #<simm>}] 0 0 1 LDUR <Qt>, [<Xn|SP>{, #<simm>}] if opc<1> == '1' && size != '00' then UNDEFINED; constant integer scale = if opc<1> == '1' then 4 else UInt(size); constant bits(64) offset = SignExtend(imm9, 64); <Bt> Is the 8-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. <Xn|SP> Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field. <simm> Is the optional signed immediate byte offset, in the range -256 to 255, defaulting to 0 and encoded in the "imm9" field. <Ht> Is the 16-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. <St> Is the 32-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. <Dt> Is the 64-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. <Qt> Is the 128-bit name of the SIMD&FP register to be transferred, encoded in the "Rt" field. constant integer t = UInt(Rt); constant integer n = UInt(Rn); constant integer datasize = 8 << scale; constant boolean nontemporal = FALSE; constant boolean tagchecked = n != 31; CheckFPEnabled64(); bits(64) address; constant boolean privileged = PSTATE.EL != EL0; constant AccessDescriptor accdesc = CreateAccDescASIMD(MemOp_LOAD, nontemporal, tagchecked, privileged); if n == 31 then CheckSPAlignment(); address = SP[]; else address = X[n, 64]; address = AddressAdd(address, offset, accdesc); V[t, datasize] = Mem[address, datasize DIV 8, accdesc];