JIT: sign-extend folded 32-bit RotateLeft/RotateRight constants

src/coreclr/jit/importercalls.cpp

@@ -6693,7 +6693,7 @@ GenTree* Compiler::impRotateHelper(var_types baseType, genTreeOps rotateOper)
             uint32_t cns1 = static_cast<uint32_t>(op1->AsIntConCommon()->IconValue());
             uint32_t res =
                 (rotateOper == GT_ROL) ? BitOperations::RotateLeft(cns1, cns2) : BitOperations::RotateRight(cns1, cns2);
-            return gtNewIconNode(res, baseType);
+            return gtNewIconNode(static_cast<int32_t>(res), baseType);
         }
     }
 

src/tests/JIT/Regression_ro_2/Runtime_135814.cs

@@ -0,0 +1,30 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using Xunit;
+
+public class Runtime_135814
+{
+    [Fact]
+    public static void TestEntryPoint()
+    {
+        Assert.True(TestGt(3));
+        Assert.False(TestLt(3));
+        Assert.True(TestRor(3));
+        Assert.Equal(-1, TestUInt());
+    }
+
+    [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
+    private static bool TestGt(int y) => y > int.RotateLeft(1, 31);
+
+    [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
+    private static bool TestLt(int y) => y < int.RotateLeft(1, 31);
+
+    [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
+    private static bool TestRor(int y) => y > int.RotateRight(1, 1);
+
+    [MethodImpl(MethodImplOptions.NoInlining | MethodImplOptions.AggressiveOptimization)]
+    private static int TestUInt() => (int)BitOperations.RotateRight(0xFFFFFFFFu, 3);
+}