SM3PARTW1
This instruction takes three 128-bit vectors from the three source SIMD&FP registers and returns a 128-bit result in the destination SIMD&FP register. The result is obtained by a three-way exclusive-OR of the elements within the input vectors with some fixed rotations, see the Operation pseudocode for more information.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 0 | 1 | 1 | Rm | 1 | 1 | 0 | 0 | 0 | 0 | Rn | Rd | ||||||||||||
| O | opcode | ||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SM3) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = 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(); let Vm : bits(128) = V{}(m); let Vn : bits(128) = V{}(n); let Vd : bits(128) = V{}(d); var result : bits(128); result[95:0] = (Vd XOR Vn)[95:0] XOR (ROL(Vm[127:96], 15)::ROL(Vm[95:64], 15)::ROL(Vm[63:32], 15)); for i = 0 to 3 do if i == 3 then result[127:96] = (Vd XOR Vn)[127:96] XOR (ROL(result[31:0], 15)); end; result[(32*i)+31:(32*i)] = (result[(32*i)+31:(32*i)] XOR ROL(result[(32*i)+31:(32*i)], 15) XOR ROL(result[(32*i)+31:(32*i)], 23)); end; V{128}(d) = result;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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