From fa6b5a8027b86d2f8a200e72b4ef6a0d3f9189d3 Mon Sep 17 00:00:00 2001
From: duke <none@none>
Date: Sat, 1 Dec 2007 00:00:00 +0000
Subject: Initial load

---
 src/share/vm/opto/coalesce.hpp | 109 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 109 insertions(+)
 create mode 100644 src/share/vm/opto/coalesce.hpp

(limited to 'src/share/vm/opto/coalesce.hpp')

diff --git a/src/share/vm/opto/coalesce.hpp b/src/share/vm/opto/coalesce.hpp
new file mode 100644
index 000000000..b7cd9da87
--- /dev/null
+++ b/src/share/vm/opto/coalesce.hpp
@@ -0,0 +1,109 @@
+/*
+ * Copyright 1997-2003 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+class LoopTree;
+class LRG;
+class LRG_List;
+class Matcher;
+class PhaseIFG;
+class PhaseCFG;
+
+//------------------------------PhaseCoalesce----------------------------------
+class PhaseCoalesce : public Phase {
+protected:
+  PhaseChaitin &_phc;
+
+public:
+  // Coalesce copies
+  PhaseCoalesce( PhaseChaitin &chaitin ) : Phase(Coalesce), _phc(chaitin) { }
+
+  virtual void verify() = 0;
+
+  // Coalesce copies
+  void coalesce_driver( );
+
+  // Coalesce copies in this block
+  virtual void coalesce( Block *b ) = 0;
+
+  // Attempt to coalesce live ranges defined by these 2
+  void combine_these_two( Node *n1, Node *n2 );
+
+  LRG &lrgs( uint lidx ) { return _phc.lrgs(lidx); }
+#ifndef PRODUCT
+  // Dump internally name
+  void dump( Node *n ) const;
+  // Dump whole shebang
+  void dump() const;
+#endif
+};
+
+//------------------------------PhaseAggressiveCoalesce------------------------
+// Aggressively, pessimistic coalesce copies.  Aggressive means ignore graph
+// colorability; perhaps coalescing to the point of forcing a spill.
+// Pessimistic means we cannot coalesce if 2 live ranges interfere.  This
+// implies we do not hit a fixed point right away.
+class PhaseAggressiveCoalesce : public PhaseCoalesce {
+  uint _unique;
+public:
+  // Coalesce copies
+  PhaseAggressiveCoalesce( PhaseChaitin &chaitin ) : PhaseCoalesce(chaitin) {}
+
+  virtual void verify() { };
+
+  // Aggressively coalesce copies in this block
+  virtual void coalesce( Block *b );
+
+  // Where I fail to coalesce, manifest virtual copies as the Real Thing
+  void insert_copies( Matcher &matcher );
+
+  // Copy insertion needs some smarts in case live ranges overlap
+  void insert_copy_with_overlap( Block *b, Node *copy, uint dst_name, uint src_name );
+};
+
+
+//------------------------------PhaseConservativeCoalesce----------------------
+// Conservatively, pessimistic coalesce copies.  Conservative means do not
+// coalesce if the resultant live range will be uncolorable.  Pessimistic
+// means we cannot coalesce if 2 live ranges interfere.  This implies we do
+// not hit a fixed point right away.
+class PhaseConservativeCoalesce : public PhaseCoalesce {
+  IndexSet _ulr;               // Union live range interferences
+public:
+  // Coalesce copies
+  PhaseConservativeCoalesce( PhaseChaitin &chaitin );
+
+  virtual void verify();
+
+  // Conservatively coalesce copies in this block
+  virtual void coalesce( Block *b );
+
+  // Coalesce this chain of copies away
+  bool copy_copy( Node *dst_copy, Node *src_copy, Block *b, uint bindex );
+
+  void union_helper( Node *lr1_node, Node *lr2_node, uint lr1, uint lr2, Node *src_def, Node *dst_copy, Node *src_copy, Block *b, uint bindex );
+
+  uint compute_separating_interferences(Node *dst_copy, Node *src_copy, Block *b, uint bindex, RegMask &rm, uint rm_size, uint reg_degree, uint lr1, uint lr2);
+
+  void update_ifg(uint lr1, uint lr2, IndexSet *n_lr1, IndexSet *n_lr2);
+};
-- 
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