1 files changed, 53 insertions, 0 deletions
diff --git a/ARMeilleure/Instructions/InstEmitCsel.cs b/ARMeilleure/Instructions/InstEmitCsel.cs
new file mode 100644
index 00000000..60baf0bc
--- /dev/null
+++ b/ARMeilleure/Instructions/InstEmitCsel.cs
@@ -0,0 +1,53 @@
+using ARMeilleure.Decoders;
+using ARMeilleure.IntermediateRepresentation;
+using ARMeilleure.Translation;
+
+using static ARMeilleure.Instructions.InstEmitFlowHelper;
+using static ARMeilleure.Instructions.InstEmitHelper;
+using static ARMeilleure.IntermediateRepresentation.OperandHelper;
+
+namespace ARMeilleure.Instructions
+{
+    static partial class InstEmit
+    {
+        private enum CselOperation
+        {
+            None,
+            Increment,
+            Invert,
+            Negate
+        }
+
+        public static void Csel(ArmEmitterContext context)  => EmitCsel(context, CselOperation.None);
+        public static void Csinc(ArmEmitterContext context) => EmitCsel(context, CselOperation.Increment);
+        public static void Csinv(ArmEmitterContext context) => EmitCsel(context, CselOperation.Invert);
+        public static void Csneg(ArmEmitterContext context) => EmitCsel(context, CselOperation.Negate);
+
+        private static void EmitCsel(ArmEmitterContext context, CselOperation cselOp)
+        {
+            OpCodeCsel op = (OpCodeCsel)context.CurrOp;
+
+            Operand n = GetIntOrZR(context, op.Rn);
+            Operand m = GetIntOrZR(context, op.Rm);
+
+            if (cselOp == CselOperation.Increment)
+            {
+                m = context.Add(m, Const(m.Type, 1));
+            }
+            else if (cselOp == CselOperation.Invert)
+            {
+                m = context.BitwiseNot(m);
+            }
+            else if (cselOp == CselOperation.Negate)
+            {
+                m = context.Negate(m);
+            }
+
+            Operand condTrue = GetCondTrue(context, op.Cond);
+
+            Operand d = context.ConditionalSelect(condTrue, n, m);
+
+            SetIntOrZR(context, op.Rd, d);
+        }
+    }
+}
+\ No newline at end of file