SHA1P SHA1 hash update (parity) SHA1 hash update (parity). This instruction is a data-independent-time instruction as described in About PSTATE.DIT. 0 1 0 1 1 1 1 0 0 0 0 0 0 0 1 0 0 SHA1P <Qd>, <Sn>, <Vm>.4S if !IsFeatureImplemented(FEAT_SHA1) 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, encoded in the "Rd" field. <Sn> Is the 32-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 x : bits(128) = V{}(d); var y : bits(32) = V{}(n); // Note: 32 not 128 bits wide let w : bits(128) = V{}(m); for e = 0 to 3 do let t : bits(32) = SHAparity(x[63:32], x[95:64], x[127:96]); y = y + ROL(x[31:0], 5) + t + w[e*:32]; x[63:32] = ROL(x[63:32], 30); let yx : bits(160) = ROL(y::x, 32); (y, x) = (yx[159:128], yx[127:0]); end; V{128}(d) = x; 2026-03-12 12:23:09 2025-09_rel_asl1