1 files changed, 38 insertions, 0 deletions
diff --git a/ARMeilleure/Decoders/OpCodeAluImm.cs b/ARMeilleure/Decoders/OpCodeAluImm.cs
new file mode 100644
index 00000000..35c83fcc
--- /dev/null
+++ b/ARMeilleure/Decoders/OpCodeAluImm.cs
@@ -0,0 +1,38 @@
+using System;
+
+namespace ARMeilleure.Decoders
+{
+    class OpCodeAluImm : OpCodeAlu, IOpCodeAluImm
+    {
+        public long Immediate { get; private set; }
+
+        public OpCodeAluImm(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
+        {
+            if (DataOp == DataOp.Arithmetic)
+            {
+                Immediate = (opCode >> 10) & 0xfff;
+
+                int shift = (opCode >> 22) & 3;
+
+                Immediate <<= shift * 12;
+            }
+            else if (DataOp == DataOp.Logical)
+            {
+                var bm = DecoderHelper.DecodeBitMask(opCode, true);
+
+                if (bm.IsUndefined)
+                {
+                    Instruction = InstDescriptor.Undefined;
+
+                    return;
+                }
+
+                Immediate = bm.WMask;
+            }
+            else
+            {
+                throw new ArgumentException(nameof(opCode));
+            }
+        }
+    }
+}
+\ No newline at end of file