1 files changed, 49 insertions, 0 deletions
diff --git a/tests/src/JIT/Regression/JitBlue/DevDiv_278365/DevDiv_278365.cs b/tests/src/JIT/Regression/JitBlue/DevDiv_278365/DevDiv_278365.cs
new file mode 100644
index 0000000000..631175a38e
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/DevDiv_278365/DevDiv_278365.cs
@@ -0,0 +1,49 @@
+// 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;
+
+// This test is a reduced repro case for DevDiv VSO bug 278365.
+// The failure mode is that the RyuJIT/x86 backend changed call to ROUND intrinsic
+// with double return type to ROUND intrinsic with int return type, that is not supported.
+
+internal class Program
+{
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public static int Bar()
+    {
+        int sum = 0;
+        for (int i = 0; i < 100; ++i)
+        {
+            int v = (int)Math.Round(4.4 + i);
+            sum += v;
+        }
+        sum -= 4 * 100;
+        if (sum != 100 * 99 / 2)
+        {
+            return 0;
+        }
+        else
+        {
+            return 100;
+        }        
+    }
+	
+    private static int Main(string[] args)
+    {
+        try
+        {
+            if (Bar() != 100)
+                return 0;
+        }
+        catch (Exception)
+        {
+        }
+
+        Console.WriteLine("Pass");
+        return 100;
+    }
+}