SHA1SU1 SHA1 schedule update 1 SHA1 schedule update 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 1 0 1 0 0 0 0 0 0 1 1 0 SHA1SU1 <Vd>.4S, <Vn>.4S if !IsFeatureImplemented(FEAT_SHA1) 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 = operand1 EOR LSR(operand2, 32); bits(128) result; result<31:0> = ROL(T<31:0>, 1); result<63:32> = ROL(T<63:32>, 1); result<95:64> = ROL(T<95:64>, 1); result<127:96> = ROL(T<127:96>, 1) EOR ROL(T<31:0>, 2); V[d, 128] = result;