1 files changed, 53 insertions, 0 deletions
diff --git a/tests/src/JIT/Regression/JitBlue/GitHub_7907/GitHub_7907.cs b/tests/src/JIT/Regression/JitBlue/GitHub_7907/GitHub_7907.cs
new file mode 100644
index 0000000000..32ea54c663
--- /dev/null
+++ b/tests/src/JIT/Regression/JitBlue/GitHub_7907/GitHub_7907.cs
@@ -0,0 +1,53 @@
+// 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;
+
+#pragma warning disable 472
+
+public class Bug7907
+{
+    int _position = 10;
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public static int G(int z, ref int r)
+    {
+        r -= z;
+        return 1;
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public int F0(int count)
+    {
+        int initialCount = count;
+
+        _position += G(_position, ref count);
+
+        if (initialCount == count)
+        {
+            count--;
+        }
+
+        return initialCount - count;
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining)]
+    public int F1(int count)
+    {
+        // " != null" is known to be true - just to remove control flow
+        // since that by itself may force spilling and mask the bug
+        count -= (_position += G(_position, ref count)) != null ? count : 1;
+
+        return count;
+    }
+
+    public static int Main(string[] args)
+    {
+        int result0 = new Bug7907().F0(10);
+        int result1 = new Bug7907().F1(10);
+        Console.WriteLine("R0={0} R1={1}", result0, result1);
+        return (result0 == 10 && result1 == 10 ? 100 : -1);
+    }
+}