1 files changed, 46 insertions, 0 deletions
diff --git a/src/ARMeilleure/Decoders/OpCode32SimdShImm.cs b/src/ARMeilleure/Decoders/OpCode32SimdShImm.cs
new file mode 100644
index 00000000..55ddc395
--- /dev/null
+++ b/src/ARMeilleure/Decoders/OpCode32SimdShImm.cs
@@ -0,0 +1,46 @@
+namespace ARMeilleure.Decoders
+{
+    class OpCode32SimdShImm : OpCode32Simd
+    {
+        public int Shift { get; }
+
+        public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCode32SimdShImm(inst, address, opCode, false);
+        public new static OpCode CreateT32(InstDescriptor inst, ulong address, int opCode) => new OpCode32SimdShImm(inst, address, opCode, true);
+
+        public OpCode32SimdShImm(InstDescriptor inst, ulong address, int opCode, bool isThumb) : base(inst, address, opCode, isThumb)
+        {
+            int imm6 = (opCode >> 16) & 0x3f;
+            int limm6 = ((opCode >> 1) & 0x40) | imm6;
+
+            if ((limm6 & 0x40) == 0b1000000)
+            {
+                Size = 3;
+                Shift = imm6;
+            }
+            else if ((limm6 & 0x60) == 0b0100000)
+            {
+                Size = 2;
+                Shift = imm6 - 32;
+            }
+            else if ((limm6 & 0x70) == 0b0010000)
+            {
+                Size = 1;
+                Shift = imm6 - 16;
+            }
+            else if ((limm6 & 0x78) == 0b0001000)
+            {
+                Size = 0;
+                Shift = imm6 - 8;
+            }
+            else
+            {
+                Instruction = InstDescriptor.Undefined;
+            }
+
+            if (GetType() == typeof(OpCode32SimdShImm) && DecoderHelper.VectorArgumentsInvalid(Q, Vd, Vm))
+            {
+                Instruction = InstDescriptor.Undefined;
+            }
+        }
+    }
+}