[llvm] [llvm][AArch64][Assembly]: Add LUT assembly/disassembly. (PR #70802)

[via llvm-commits]

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@@ -4713,3 +4732,36 @@ class sme2p1_luti4_vector_vg4_index<bits<2> sz, RegisterOperand vector_ty,
 multiclass sme2p1_luti4_vector_vg4_index<string mnemonic> {
   def _H: sme2p1_luti4_vector_vg4_index<0b01, ZZZZ_h_strided, VectorIndexD, mnemonic>;
 }
+
+// SME2 lookup table two source registers expand to four contiguous destination registers
+class sme2_luti4_vector_vg4<bits<2> sz, bits<2> op, string mnemonic>
+  : I<(outs ZZZZ_b_mul_r:$Zd), (ins ZTR:$ZTt, ZZ_mul_r:$Zn),
+       mnemonic, "\t$Zd, $ZTt, $Zn",
+       "", []>, Sched<[]> {
+  bits<4> Zn;
+  bits<3> Zd;
+  let Inst{31-14} = 0b110000001000101100;
+  let Inst{13-12} = sz;
+  let Inst{11-10} = op;
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CarolineConcatto wrote:

nit:align

https://github.com/llvm/llvm-project/pull/70802