diff --git a/ChocolArm64/Instruction/AInstEmitAlu.cs b/ChocolArm64/Instruction/AInstEmitAlu.cs
index 57020364b7..bacbfc9e81 100644
--- a/ChocolArm64/Instruction/AInstEmitAlu.cs
+++ b/ChocolArm64/Instruction/AInstEmitAlu.cs
@@ -100,6 +100,24 @@ namespace ChocolArm64.Instruction
             EmitDataStore(Context, SetFlags);
         }
 
+        public static void Cls(AILEmitterCtx Context)
+        {
+            AOpCodeAlu Op = (AOpCodeAlu)Context.CurrOp;
+
+            Context.EmitLdintzr(Op.Rn);
+
+            if (Op.RegisterSize == ARegisterSize.Int32)
+            {
+                ASoftFallback.EmitCall(Context, nameof(ASoftFallback.CountLeadingSigns32));
+            }
+            else
+            {
+                ASoftFallback.EmitCall(Context, nameof(ASoftFallback.CountLeadingSigns64));
+            }
+
+            Context.EmitStintzr(Op.Rd);
+        }
+
         public static void Clz(AILEmitterCtx Context)
         {
             AOpCodeAlu Op = (AOpCodeAlu)Context.CurrOp;
@@ -383,4 +401,4 @@ namespace ChocolArm64.Instruction
             Context.EmitStflg((int)APState.CBit);
         }
     }
-}
\ No newline at end of file
+}