8230185: assert(is_Loop()) failed: invalid node class

Adding missing check for a counted loop.

Reviewed-by: kvn, thartmann

src/hotspot/share/opto/loopopts.cpp

@@ -498,9 +498,10 @@ Node *PhaseIdealLoop::convert_add_to_muladd(Node* n) {
   Node * in2 = n->in(2);
   if (in1->Opcode() == Op_MulI && in2->Opcode() == Op_MulI) {
     IdealLoopTree* loop_n = get_loop(get_ctrl(n));
-    if (loop_n->_head->as_Loop()->is_valid_counted_loop() &&
-        Matcher::match_rule_supported(Op_MulAddS2I) &&
-        Matcher::match_rule_supported(Op_MulAddVS2VI)) {
+    if (loop_n->is_counted() &&
+        loop_n->_head->as_Loop()->is_valid_counted_loop() &&
+        Matcher::match_rule_supported(Op_MulAddVS2VI) &&
+        Matcher::match_rule_supported(Op_MulAddS2I)) {
       Node* mul_in1 = in1->in(1);
       Node* mul_in2 = in1->in(2);
       Node* mul_in3 = in2->in(1);

test/hotspot/jtreg/compiler/loopopts/TestIrreducibleLoopWithVNNI.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2019, 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.
+ *
+ * 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 8230185
+ * @summary assert(is_Loop()) failed: invalid node class, during OSR compilation
+ * for VNNI pattern match.
+ *
+ * @run main/othervm -Xcomp
+ *      -XX:CompileCommand=compileonly,compiler.loopopts.TestIrreducibleLoopWithVNNI::*
+ *      compiler.loopopts.TestIrreducibleLoopWithVNNI
+ */
+
+package compiler.loopopts;
+
+public class TestIrreducibleLoopWithVNNI {
+    public static boolean condition = false;
+
+    public static void main(String[] strArr) {
+        TestIrreducibleLoopWithVNNI _instance = new TestIrreducibleLoopWithVNNI();
+        for (int i = 0; i < 10; i++) {
+            _instance.mainTest();
+        }
+    }
+
+    public void mainTest() {
+        int a = 1, b = 1, c = 1, d = 51;
+        for (b = 0; b < 100; b++) {
+            a = a + b * 342;
+            for (c = 0; c < 100; c++) {
+                for (d = 0; d < 1; d++)
+                    a = d;
+                if (condition)
+                    break;
+            }
+            a = d * a;
+        }
+    }
+}