diff --git a/src/frontend/A64/decoder/a64.inc b/src/frontend/A64/decoder/a64.inc
index 73655bd0..ac9692f5 100644
--- a/src/frontend/A64/decoder/a64.inc
+++ b/src/frontend/A64/decoder/a64.inc
@@ -716,7 +716,7 @@ INST(SMIN,                   "SMIN",                                      "0Q001
 //INST(SABD,                   "SABD",                                      "0Q001110zz1mmmmm011101nnnnnddddd")
 //INST(SABA,                   "SABA",                                      "0Q001110zz1mmmmm011111nnnnnddddd")
 INST(ADD_vector,             "ADD (vector)",                              "0Q001110zz1mmmmm100001nnnnnddddd")
-//INST(CMTST_2,                "CMTST",                                     "0Q001110zz1mmmmm100011nnnnnddddd")
+INST(CMTST_2,                "CMTST",                                     "0Q001110zz1mmmmm100011nnnnnddddd")
 INST(MLA_vec,                "MLA (vector)",                              "0Q001110zz1mmmmm100101nnnnnddddd")
 INST(MUL_vec,                "MUL (vector)",                              "0Q001110zz1mmmmm100111nnnnnddddd")
 //INST(SMAXP,                  "SMAXP",                                     "0Q001110zz1mmmmm101001nnnnnddddd")
diff --git a/src/frontend/A64/translate/impl/simd_three_same.cpp b/src/frontend/A64/translate/impl/simd_three_same.cpp
index 1ca87cdd..1501d694 100644
--- a/src/frontend/A64/translate/impl/simd_three_same.cpp
+++ b/src/frontend/A64/translate/impl/simd_three_same.cpp
@@ -242,6 +242,23 @@ bool TranslatorVisitor::CMHS_2(bool Q, Imm<2> size, Vec Vm, Vec Vn, Vec Vd) {
     return true;
 }
 
+bool TranslatorVisitor::CMTST_2(bool Q, Imm<2> size, Vec Vm, Vec Vn, Vec Vd) {
+    if (size == 0b11 && !Q) {
+        return ReservedValue();
+    }
+
+    const size_t datasize = Q ? 128 : 64;
+    const size_t esize = 8 << size.ZeroExtend();
+
+    const IR::U128 operand1 = V(datasize, Vn);
+    const IR::U128 operand2 = V(datasize, Vm);
+    const IR::U128 anded = ir.VectorAnd(operand1, operand2);
+    const IR::U128 result = ir.VectorNot(ir.VectorEqual(esize, anded, ir.ZeroVector()));
+
+    V(datasize, Vd, result);
+    return true;
+}
+
 bool TranslatorVisitor::USHL_2(bool Q, Imm<2> size, Vec Vm, Vec Vn, Vec Vd) {
     if (size == 0b11 && !Q) {
         return ReservedValue();