1 files changed, 42 insertions, 0 deletions
diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_8599/GitHub_8599.cs b/tests/src/JIT/Regression/JitBlue/GitHub_8599/GitHub_8599.cs
new file mode 100644
index 0000000000..95ff457620
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/GitHub_8599/GitHub_8599.cs
@@ -0,0 +1,42 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Runtime.CompilerServices;
+
+// TreeNodeInfoInitCmp attempts to eliminate the cast from cmp(cast<ubyte>(x), icon)
+// by narrowing the compare to ubyte. This should only happen if the constant fits in
+// a byte so it can be narrowed too, otherwise codegen produces an int sized compare.
+
+class Program
+{
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    static int GetValue() => 301;
+
+    static void Escape(ref int x)
+    {
+    }
+
+    static int Main()
+    {
+        if ((byte)GetValue() > 300)
+        {
+            return -1;
+        }
+
+        int x = GetValue();
+        Escape(ref x);
+        if ((byte)x > 300)
+        {
+            return -2;
+        }
+
+        if ((byte)(GetValue() | 2) > 300)
+        {
+            return -3;
+        }
+
+        return 100;
+    }
+}