# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1379600292 -7200
# Node ID fdd2cdeb933c3dccd7e99d27a003ffb73b141ab4
# Parent  7778a0f2999a6df1d16198fcb681d987d0652826# Parent  3e4482a06170b150736d7dda623de37c187dbc8c
Merge.

diff -r 7778a0f2999a -r fdd2cdeb933c graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/phases/MidTier.java
--- a/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/phases/MidTier.java	Thu Sep 19 15:53:26 2013 +0200
+++ b/graal/com.oracle.graal.compiler/src/com/oracle/graal/compiler/phases/MidTier.java	Thu Sep 19 16:18:12 2013 +0200
@@ -89,6 +89,8 @@
 
         appendPhase(new FrameStateAssignmentPhase());
 
+        appendPhase(new DeoptimizationGroupingPhase());
+
         if (OptCanonicalizer.getValue()) {
             appendPhase(canonicalizer);
         }
diff -r 7778a0f2999a -r fdd2cdeb933c graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graal/com.oracle.graal.phases.common/src/com/oracle/graal/phases/common/DeoptimizationGroupingPhase.java	Thu Sep 19 16:18:12 2013 +0200
@@ -0,0 +1,86 @@
+/*
+ * Copyright (c) 2013, 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.
+ */
+package com.oracle.graal.phases.common;
+
+import java.util.*;
+
+import com.oracle.graal.nodes.*;
+import com.oracle.graal.nodes.cfg.*;
+import com.oracle.graal.phases.*;
+
+/**
+ * This phase tries to find {@link DeoptimizeNode DeoptimizeNodes} which use the same
+ * {@link FrameState} and merges them together.
+ */
+public class DeoptimizationGroupingPhase extends Phase {
+
+    @Override
+    protected void run(StructuredGraph graph) {
+        ControlFlowGraph cfg = null;
+        for (FrameState fs : graph.getNodes(FrameState.class)) {
+            FixedNode target = null;
+            List<DeoptimizeNode> obsoletes = null;
+            for (DeoptimizeNode deopt : fs.usages().filter(DeoptimizeNode.class)) {
+                if (target == null) {
+                    target = deopt;
+                } else {
+                    if (cfg == null) {
+                        cfg = ControlFlowGraph.compute(graph, true, true, false, false);
+                    }
+                    MergeNode merge;
+                    if (target instanceof DeoptimizeNode) {
+                        merge = graph.add(new MergeNode());
+                        EndNode firstEnd = graph.add(new EndNode());
+                        merge.addForwardEnd(firstEnd);
+                        target.predecessor().replaceFirstSuccessor(target, firstEnd);
+                        exitLoops((DeoptimizeNode) target, firstEnd, cfg);
+                        merge.setNext(target);
+                        obsoletes = new LinkedList<>();
+                        target = merge;
+                    } else {
+                        merge = (MergeNode) target;
+                    }
+                    EndNode newEnd = graph.add(new EndNode());
+                    merge.addForwardEnd(newEnd);
+                    deopt.predecessor().replaceFirstSuccessor(deopt, newEnd);
+                    exitLoops(deopt, newEnd, cfg);
+                    obsoletes.add(deopt);
+                }
+            }
+            if (obsoletes != null) {
+                for (DeoptimizeNode obsolete : obsoletes) {
+                    obsolete.safeDelete();
+                }
+            }
+        }
+    }
+
+    private static void exitLoops(DeoptimizeNode deopt, EndNode end, ControlFlowGraph cfg) {
+        Block block = cfg.blockFor(deopt);
+        Loop loop = block.getLoop();
+        while (loop != null) {
+            end.graph().addBeforeFixed(end, end.graph().add(new LoopExitNode(loop.loopBegin())));
+            loop = loop.parent;
+        }
+    }
+}