ADDP (scalar) Add pair of elements (scalar) This instruction adds two vector elements in the source SIMD&FP register and writes the scalar result into the destination SIMD&FP register. 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 execution time of this instruction is independent of: The values of the data supplied in any of its registers. The values of the NZCV flags. The response of this instruction to asynchronous exceptions does not vary based on: The values of the data supplied in any of its registers. The values of the NZCV flags. 0 1 0 1 1 1 1 0 1 1 1 1 0 0 0 1 1 0 1 1 1 0 ADDP D<d>, <Vn>.2D constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer esize = 64; constant integer datasize = 128; <d> Is the number of the SIMD&FP destination register, encoded in the "Rd" field. <Vn> Is the name of the SIMD&FP source register, encoded in the "Rn" field. CheckFPAdvSIMDEnabled64(); constant bits(datasize) operand = V[n, datasize]; V[d, esize] = IntReduce(ReduceOp_ADD, operand, esize);