SHA1SU0 SHA1 schedule update 0 SHA1 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 0 0 0 1 1 0 0 SHA1SU0 <Vd>.4S, <Vn>.4S, <Vm>.4S if !IsFeatureImplemented(FEAT_SHA1) then UNDEFINED; constant integer d = UInt(Rd); constant integer n = UInt(Rn); constant integer m = UInt(Rm); <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. <Vm> Is the name of the third SIMD&FP source register, encoded in the "Rm" field. AArch64.CheckFPAdvSIMDEnabled(); constant bits(128) operand1 = V[d, 128]; constant bits(128) operand2 = V[n, 128]; constant bits(128) operand3 = V[m, 128]; bits(128) result = operand2<63:0> : operand1<127:64>; result = result EOR operand1 EOR operand3; V[d, 128] = result;