SHA256SU0 SHA256 schedule update 0 SHA256 schedule update 0. 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 0 0 1 0 1 0 0 0 0 0 1 0 1 0 SHA256SU0 <Vd>.4S, <Vn>.4S if !IsFeatureImplemented(FEAT_SHA256) then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); <Vd> Is the name of the SIMD&FP source and destination register, encoded in the "Rd" field. <Vn> Is the name of the second SIMD&FP source register, encoded in the "Rn" field. AArch64.CheckFPAdvSIMDEnabled(); constant bits(128) operand1 = V[d, 128]; constant bits(128) operand2 = V[n, 128]; constant bits(128) T = operand2<31:0> : operand1<127:32>; bits(128) result; bits(32) elt; for e = 0 to 3 elt = Elem[T, e, 32]; elt = ROR(elt, 7) EOR ROR(elt, 18) EOR LSR(elt, 3); Elem[result, e, 32] = elt + Elem[operand1, e, 32]; V[d, 128] = result;