Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

## SM3PARTW2

SM3PARTW2 takes three 128-bit vectors from 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.

This instruction is implemented only when FEAT_SM3 is implemented.

### Advanced SIMD
(FEAT_SM3)

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 | 1 | Rn | Rd

####

SM3PARTW2 <Vd>.4S, <Vn>.4S, <Vm>.4S

if !HaveSM3Ext() then UNDEFINED; integer d = UInt(Rd); integer n = UInt(Rn); integer m = UInt(Rm);

### Assembler Symbols

<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.

### Operation

AArch64.CheckFPAdvSIMDEnabled(); bits(128) Vm = V[m, 128]; bits(128) Vn = V[n, 128]; bits(128) Vd = V[d, 128]; bits(128) result; bits(128) tmp; bits(32) tmp2; tmp<127:0> = Vn EOR (ROL(Vm<127:96>, 7):ROL(Vm<95:64>, 7):ROL(Vm<63:32>, 7):ROL(Vm<31:0>, 7)); result<127:0> = Vd<127:0> EOR tmp<127:0>; tmp2 = ROL(tmp<31:0>, 15); tmp2 = tmp2 EOR ROL(tmp2, 15) EOR ROL(tmp2, 23); result<127:96> = result<127:96> EOR tmp2; V[d, 128] = result;

### Operational information

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.

Base Instructions | SIMD&FP Instructions | SVE Instructions | SME Instructions | Index by Encoding | Shared Pseudocode | Proprietary Notice

Internal version only: isa v33.53, AdvSIMD v29.11, pseudocode v2022-09_rel, sve v2022-09_rel ; Build timestamp: 2022-09-30T16:37

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