From 134f72112b7de9564770f10b3453d87cf7f8c83c Mon Sep 17 00:00:00 2001
From: Quan Anh Mai <anhmdq99@gmail.com>
Date: Sat, 24 Jan 2026 01:02:42 +0700
Subject: [PATCH] Add IR test

---
 .../integerArithmetic/TestHoistDivision.java  | 77 +++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 test/hotspot/jtreg/compiler/integerArithmetic/TestHoistDivision.java

diff --git a/test/hotspot/jtreg/compiler/integerArithmetic/TestHoistDivision.java b/test/hotspot/jtreg/compiler/integerArithmetic/TestHoistDivision.java
new file mode 100644
index 00000000000..26fce864c12
--- /dev/null
+++ b/test/hotspot/jtreg/compiler/integerArithmetic/TestHoistDivision.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package compiler.integerArithmetic;
+
+import compiler.lib.ir_framework.*;
+import jdk.test.lib.Asserts;
+
+/*
+ * @test
+ * @bug 8347365
+ * @summary Tests that divisions are hoisted when their zero checks are elided.
+ * @library /test/lib /
+ * @run driver ${test.main.class}
+ */
+public class TestHoistDivision {
+    public static void main(String[] args) {
+        TestFramework.run();
+    }
+
+    @DontInline
+    private static void dontInline() {}
+
+    @Run(test = {"testCommon", "testHoistOutOfLoop"})
+    public void run() {
+        Asserts.assertEQ(2, testCommon(1, 1));
+        Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, true, 1, 4, 2));
+        Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, false, 1, 4, 2));
+    }
+
+    @Test
+    @IR(counts = {IRNode.DIV_I, "1", IRNode.DIV_BY_ZERO_TRAP, "1"})
+    public int testCommon(int x, int y) {
+        // The 2 divisions should be commoned
+        int result = x / y;
+        dontInline();
+        return result + x / y;
+    }
+
+    @Test
+    @IR(failOn = IRNode.DIV_BY_ZERO_TRAP, counts = {IRNode.DIV_I, "1", IRNode.TRAP, "1"})
+    public int testHoistOutOfLoop(int x, int y, boolean b, int start, int limit, int step) {
+        // The divisions should be hoisted out of the loop, allowing them to be commoned
+        int result = 0;
+        for (int i = start; i < limit; i *= step) {
+            if (b) {
+                dontInline();
+                result += x / y;
+            } else {
+                result -= x / y;
+            }
+            b = !b;
+        }
+        return result;
+    }
+}