SHA256H SHA256 hash update (part 1) SHA256 hash update (part 1). 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 0 0 1 0 0 0 0 SHA256H <Qd>, <Qn>, <Vm>.4S if !IsFeatureImplemented(FEAT_SHA256) then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer m = UInt(Rm); <Qd> Is the 128-bit name of the SIMD&FP source and destination, encoded in the "Rd" field. <Qn> Is the 128-bit name of the second SIMD&FP source register, encoded in the "Rn" field. <Vm> Is the name of the third SIMD&FP source register, encoded in the "Rm" field. AArch64.CheckFPAdvSIMDEnabled(); constant boolean part1 = TRUE; V[d, 128] = SHA256hash(V[d, 128], V[n, 128], V[m, 128], part1);