# HG changeset patch
# User roland
# Date 1530287984 -7200
# Node ID 3fd01bccc81f3817bd53e451fe2966ab6286871c
# Parent  46ca5e6b7ed8cc9763b74efbf2aba56c4397d49e
8202123: C2 Crash in Node::in(unsigned int) const+0x14
Reviewed-by: kvn, thartmann

diff -r 46ca5e6b7ed8 -r 3fd01bccc81f src/hotspot/share/opto/loopnode.cpp
--- a/src/hotspot/share/opto/loopnode.cpp	Tue Jul 10 03:14:55 2018 -0400
+++ b/src/hotspot/share/opto/loopnode.cpp	Fri Jun 29 17:59:44 2018 +0200
@@ -616,6 +616,11 @@
     }
 
     IfNode* check_iff = limit_check_proj->in(0)->as_If();
+
+    if (!is_dominator(get_ctrl(limit), check_iff->in(0))) {
+      return false;
+    }
+
     Node* cmp_limit;
     Node* bol;
 
diff -r 46ca5e6b7ed8 -r 3fd01bccc81f test/hotspot/jtreg/compiler/loopopts/TestLimitLoadBelowLoopLimitCheck.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/hotspot/jtreg/compiler/loopopts/TestLimitLoadBelowLoopLimitCheck.java	Fri Jun 29 17:59:44 2018 +0200
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2018, Red Hat, Inc. 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.
+ *
+ * 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.
+ */
+
+/**
+ * @test
+ * @bug 8202123
+ * @summary C2 Crash in Node::in(unsigned int) const+0x14
+ *
+ * @run main/othervm TestLimitLoadBelowLoopLimitCheck
+ *
+ */
+
+public class TestLimitLoadBelowLoopLimitCheck {
+    public static int[] run(int[] arr) {
+        int max = 0;
+        for (int i : arr) {
+            if (i > max) {
+                max = i;
+            }
+        }
+
+        int[] counts = new int[10];
+
+        int i = 0;
+        for (i = 0; i < counts.length; i += 1) {
+            for (int j = 0; j < counts[i]; j += 1) {
+            }
+        }
+
+        while (i < max) {
+            for (int j = 0; j < counts[i]; j += 1) {
+                arr[0] = i;
+            }
+        }
+
+        return arr;
+    }
+
+    public static void main(String[] args) {
+        int[] arr = new int[1000 * 1000];
+
+        for (int i = 0; i < 100; i++) {
+            run(arr);
+        }
+    }
+}