8011706: specjvm2008 test xml.transform gets array bound exception with c1

Summary: loop invariant code motion may move load before store to the same field
Reviewed-by: kvn

src/share/vm/c1/c1_ValueMap.cpp

@@ -316,6 +316,7 @@ class LoopInvariantCodeMotion : public StackObj  {
   ShortLoopOptimizer*   _short_loop_optimizer;
   Instruction*          _insertion_point;
   ValueStack *          _state;
+  bool                  _insert_is_pred;
 
   void set_invariant(Value v) const    { _gvn->set_processed(v); }
   bool is_invariant(Value v) const     { return _gvn->is_processed(v); }
@@ -339,6 +340,7 @@ LoopInvariantCodeMotion::LoopInvariantCodeMotion(ShortLoopOptimizer *slo, Global
 
   assert(insertion_block->end()->as_Base() == NULL, "cannot insert into entry block");
   _insertion_point = insertion_block->end()->prev();
+  _insert_is_pred = loop_header->is_predecessor(insertion_block);
 
   BlockEnd *block_end = insertion_block->end();
   _state = block_end->state_before();
@@ -379,13 +381,13 @@ void LoopInvariantCodeMotion::process_block(BlockBegin* block) {
     } else if (cur->as_LoadField() != NULL) {
       LoadField* lf = (LoadField*)cur;
       // deoptimizes on NullPointerException
-      cur_invariant = !lf->needs_patching() && !lf->field()->is_volatile() && !_short_loop_optimizer->has_field_store(lf->field()->type()->basic_type()) && is_invariant(lf->obj());
+      cur_invariant = !lf->needs_patching() && !lf->field()->is_volatile() && !_short_loop_optimizer->has_field_store(lf->field()->type()->basic_type()) && is_invariant(lf->obj()) && _insert_is_pred;
     } else if (cur->as_ArrayLength() != NULL) {
       ArrayLength *length = cur->as_ArrayLength();
       cur_invariant = is_invariant(length->array());
     } else if (cur->as_LoadIndexed() != NULL) {
       LoadIndexed *li = (LoadIndexed *)cur->as_LoadIndexed();
-      cur_invariant = !_short_loop_optimizer->has_indexed_store(as_BasicType(cur->type())) && is_invariant(li->array()) && is_invariant(li->index());
+      cur_invariant = !_short_loop_optimizer->has_indexed_store(as_BasicType(cur->type())) && is_invariant(li->array()) && is_invariant(li->index()) && _insert_is_pred;
     }
 
     if (cur_invariant) {

test/compiler/8011706/Test8011706.java

+/*
+ * Copyright (c) 2013, 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 8011706
+ * @summary loop invariant code motion may move load before store to the same field
+ * @run main/othervm -XX:-UseOnStackReplacement -XX:-BackgroundCompilation Test8011706
+ *
+ */
+
+public class Test8011706 {
+    int[] array;
+
+    void m(boolean test, int[] array1, int[] array2) {
+        int i = 0;
+        if (test) {
+            array = array1;
+        } else {
+            array = array2;
+        }
+
+        while(true) {
+            int v = array[i];
+            i++;
+            if (i >= 10) return;
+        }
+    }
+
+    static public void main(String[] args) {
+        int[] new_array = new int[10];
+        Test8011706 ti = new Test8011706();
+        boolean failed = false;
+        try {
+            for (int i = 0; i < 10000; i++) {
+                ti.array = null;
+                ti.m(true, new_array, new_array);
+            }
+        } catch(NullPointerException ex) {
+            throw new RuntimeException("TEST FAILED", ex);
+        }
+        System.out.println("TEST PASSED");
+    }
+
+}