1 files changed, 53 insertions, 0 deletions
diff --git a/test/828-partial-lse/src/Main.java b/test/828-partial-lse/src/Main.java
new file mode 100644
index 0000000000..2dde0eff95
--- /dev/null
+++ b/test/828-partial-lse/src/Main.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+class Main {
+
+  public static void $noinline$testMain(Main m) {
+    expectEquals(0, m.myField);
+  }
+
+  public static void main(String[] args) {
+    $noinline$doTest(true);
+    $noinline$doTest(false);
+  }
+
+  public static void $noinline$doTest(boolean testValue) {
+    Main m = new Main();
+    // LSE will find that this store can be removed, as both branches override the value with a new
+    // one.
+    m.myField = 42;
+    if (testValue) {
+      // LSE will remove this store as well, as it's the value after the store of 42 is removed.
+      m.myField = 0;
+      // This makes sure `m` gets materialized. At this point, the bug is that the partial LSE
+      // optimization thinks the value incoming this block for `m.myField` is 42, however that
+      // store, as well as the store to 0, have been removed.
+      $noinline$testMain(m);
+    } else {
+      m.myField = 3;
+      expectEquals(3, m.myField);
+    }
+  }
+
+  public static void expectEquals(int expected, int actual) {
+    if (expected != actual) {
+      throw new Error("Expected " + expected + ", got " + actual);
+    }
+  }
+
+  int myField = 0;
+}