8134974: 8130847 broken with loop predicates

Pinned eliminated arraycopy loads in uncommon trap path for loop predicates may need to be moved

Reviewed-by: kvn

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

@@ -112,6 +112,13 @@ ProjNode* PhaseIdealLoop::create_new_if_for_predicate(ProjNode* cont_proj, Node*
     if (_idom != NULL) {
       set_idom(call, rgn, dom_depth(rgn));
     }
+    for (DUIterator_Fast imax, i = uncommon_proj->fast_outs(imax); i < imax; i++) {
+      Node* n = uncommon_proj->fast_out(i);
+      if (n->is_Load() || n->is_Store()) {
+        _igvn.replace_input_of(n, 0, rgn);
+        --i; --imax;
+      }
+    }
   } else {
     // Find region's edge corresponding to uncommon_proj
     for (; proj_index < rgn->req(); proj_index++)

hotspot/test/compiler/arraycopy/TestEliminatedArrayLoopPredicateCopyDeopt.java

@@ -0,0 +1,53 @@
+/*
+ * 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 8134974
+ * @summary Cannot pin eliminated arraycopy loads for deopt state in uncommon trap path if it is a loop predicate unc
+ * @run main/othervm -XX:-BackgroundCompilation -XX:-UseOnStackReplacement TestEliminatedArrayLoopPredicateCopyDeopt
+ *
+ */
+
+public class TestEliminatedArrayLoopPredicateCopyDeopt {
+
+    static boolean test(int[] array_src) {
+        int[] array_dst = new int[10];
+        System.arraycopy(array_src, 0, array_dst, 0, 10);
+
+        for (int i = 0; i < 100; i++) {
+            array_src[i] = i;
+        }
+        if (array_dst[0] == 0) {
+            return true;
+        }
+        return false;
+    }
+
+    static public void main(String[] args) {
+        int[] array_src = new int[100];
+        for (int i = 0; i < 20000; i++) {
+            test(array_src);
+        }
+    }
+}