SHA512H SHA-512 hash update part 1 This instruction takes the values from the three 128-bit source SIMD&FP registers and produces a 128-bit output value that combines the sigma1 and chi functions of two iterations of the SHA-512 calculation. It returns this value to the destination SIMD&FP register. This instruction is a data-independent-time instruction as described in About PSTATE.DIT. 1 1 0 0 1 1 1 0 0 1 1 1 0 0 0 0 0 SHA512H <Qd>, <Qn>, <Vm>.2D if !IsFeatureImplemented(FEAT_SHA512) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); <Qd> Is the 128-bit name of the SIMD&FP source and destination register, 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(); var Vtmp : bits(128); var MSigma1 : bits(64); var tmp : bits(64); let x : bits(128) = V{}(n); let y : bits(128) = V{}(m); let w : bits(128) = V{}(d); MSigma1 = ROR(y[127:64], 14) XOR ROR(y[127:64], 18) XOR ROR(y[127:64], 41); Vtmp[127:64] = (y[127:64] AND x[63:0]) XOR (NOT(y[127:64]) AND x[127:64]); Vtmp[127:64] = (Vtmp[127:64] + MSigma1 + w[127:64]); tmp = Vtmp[127:64] + y[63:0]; MSigma1 = ROR(tmp, 14) XOR ROR(tmp, 18) XOR ROR(tmp, 41); Vtmp[63:0] = (tmp AND y[127:64]) XOR (NOT(tmp) AND x[63:0]); Vtmp[63:0] = (Vtmp[63:0] + MSigma1 + w[63:0]); V{128}(d) = Vtmp; 2026-03-26 20:27:25 2026-03_rel