8073184: Compile of java.lang.Integer::getChars fails with LoopLimitCheck = false after 8054478

Summary: CastII that guards counted loops confuses range check elimination with LoopLimitCheck off
Reviewed-by: kvn, iveresov

hotspot/src/share/vm/opto/loopTransform.cpp

@@ -2032,7 +2032,7 @@ void PhaseIdealLoop::do_range_check( IdealLoopTree *loop, Node_List &old_new ) {
     // Hopefully, compiler will optimize for powers of 2.
     Node *ctrl = get_ctrl(main_limit);
     Node *stride = cl->stride();
-    Node *init = cl->init_trip();
+    Node *init = cl->init_trip()->uncast();
     Node *span = new SubINode(main_limit,init);
     register_new_node(span,ctrl);
     Node *rndup = _igvn.intcon(stride_con + ((stride_con>0)?-1:1));

hotspot/test/compiler/loopopts/TestCastIINoLoopLimitCheck.java

+/*
+ * Copyright (c) 2015, 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 8073184
+ * @summary CastII that guards counted loops confuses range check elimination with LoopLimitCheck off
+ * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-LoopLimitCheck -XX:CompileOnly=TestCastIINoLoopLimitCheck.m -Xcomp  TestCastIINoLoopLimitCheck
+ *
+ */
+
+public class TestCastIINoLoopLimitCheck {
+
+    static void m(int i, int index, char[] buf) {
+        while (i >= 65536) {
+            i = i / 100;
+            buf [--index] = 0;
+            buf [--index] = 1;
+        }
+    }
+
+    static public void main(String[] args) {
+        m(0, 0, null);
+    }
+}