1 files changed, 39 insertions, 0 deletions
diff --git a/ChocolArm64/Decoder/AOpCodeAluImm.cs b/ChocolArm64/Decoder/AOpCodeAluImm.cs
new file mode 100644
index 00000000..e913475a
--- /dev/null
+++ b/ChocolArm64/Decoder/AOpCodeAluImm.cs
@@ -0,0 +1,39 @@
+using ChocolArm64.Instruction;
+using System;
+
+namespace ChocolArm64.Decoder
+{
+    class AOpCodeAluImm : AOpCodeAlu, IAOpCodeAluImm
+    {
+        public long Imm { get; private set; }
+
+        public AOpCodeAluImm(AInst Inst, long Position, int OpCode) : base(Inst, Position, OpCode)
+        {
+            if (DataOp == ADataOp.Arithmetic)
+            {
+                Imm = (OpCode >> 10) & 0xfff;
+
+                int Shift = (OpCode >> 22) & 3;
+
+                Imm <<= Shift * 12;
+            }
+            else if (DataOp == ADataOp.Logical)
+            {
+                var BM = ADecoderHelper.DecodeBitMask(OpCode, true);
+
+                if (BM.IsUndefined)
+                {
+                    Emitter = AInstEmit.Und;
+
+                    return;
+                }
+
+                Imm = BM.WMask;
+            }
+            else
+            {
+                throw new ArgumentException(nameof(OpCode));
+            }
+        }
+    }
+}
+\ No newline at end of file