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## SM3PARTW1

SM3PARTW1 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.

This instruction is implemented only when FEAT_SM3 is implemented.

 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

SM3PARTW1 <Vd>.4S, <Vn>.4S, <Vm>.4S

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

### Assembler Symbols

 Is the name of the SIMD&FP source and destination register, encoded in the "Rd" field.
 Is the name of the second SIMD&FP source register, encoded in the "Rn" field.
 Is the name of the third SIMD&FP source register, encoded in the "Rm" field.

### Operation

bits(128) Vm = V[m];
bits(128) Vn = V[n];
bits(128) Vd = V[d];
bits(128) result;

result<95:0> = (Vd EOR Vn)<95:0> EOR (ROL(Vm<127:96>, 15):ROL(Vm<95:64>, 15):ROL(Vm<63:32>, 15));

for i = 0 to 3
if i == 3 then
result<127:96> = (Vd EOR Vn)<127:96> EOR (ROL(result<31:0>, 15));
result<(32*i)+31:(32*i)> = result<(32*i)+31:(32*i)> EOR ROL(result<(32*i)+31:(32*i)>, 15) EOR ROL(result<(32*i)+31:(32*i)>, 23);
V[d] = 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.