jdk8-mips64-public/hotspot: src/share/vm/opto/coalesce.hpp@ef57c43512d6

8014431: cleanup warnings indicated by the -Wunused-value compiler option on linux
Reviewed-by: dholmes, coleenp
Contributed-by: jeremymanson@google.com, calvin.cheung@oracle.com

     1 /*

     2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

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    23  */

    25 #ifndef SHARE_VM_OPTO_COALESCE_HPP

    26 #define SHARE_VM_OPTO_COALESCE_HPP

    28 #include "opto/phase.hpp"

    30 class LoopTree;

    31 class LRG;

    32 class LRG_List;

    33 class Matcher;

    34 class PhaseIFG;

    35 class PhaseCFG;

    37 //------------------------------PhaseCoalesce----------------------------------

    38 class PhaseCoalesce : public Phase {

    39 protected:

    40   PhaseChaitin &_phc;

    42 public:

    43   // Coalesce copies

    44   PhaseCoalesce(PhaseChaitin &phc)

    45   : Phase(Coalesce)

    46   , _phc(phc) {}

    48   virtual void verify() = 0;

    50   // Coalesce copies

    51   void coalesce_driver();

    53   // Coalesce copies in this block

    54   virtual void coalesce(Block *b) = 0;

    56   // Attempt to coalesce live ranges defined by these 2

    57   void combine_these_two(Node *n1, Node *n2);

    59   LRG &lrgs(uint lidx) { return _phc.lrgs(lidx); }

    60 #ifndef PRODUCT

    61   // Dump internally name

    62   void dump(Node *n) const;

    63   // Dump whole shebang

    64   void dump() const;

    65 #endif

    66 };

    68 //------------------------------PhaseAggressiveCoalesce------------------------

    69 // Aggressively, pessimistic coalesce copies.  Aggressive means ignore graph

    70 // colorability; perhaps coalescing to the point of forcing a spill.

    71 // Pessimistic means we cannot coalesce if 2 live ranges interfere.  This

    72 // implies we do not hit a fixed point right away.

    73 class PhaseAggressiveCoalesce : public PhaseCoalesce {

    74   uint _unique;

    75 public:

    76   // Coalesce copies

    77   PhaseAggressiveCoalesce( PhaseChaitin &chaitin ) : PhaseCoalesce(chaitin) {}

    79   virtual void verify() { };

    81   // Aggressively coalesce copies in this block

    82   virtual void coalesce( Block *b );

    84   // Where I fail to coalesce, manifest virtual copies as the Real Thing

    85   void insert_copies( Matcher &matcher );

    87   // Copy insertion needs some smarts in case live ranges overlap

    88   void insert_copy_with_overlap( Block *b, Node *copy, uint dst_name, uint src_name );

    89 };

    92 //------------------------------PhaseConservativeCoalesce----------------------

    93 // Conservatively, pessimistic coalesce copies.  Conservative means do not

    94 // coalesce if the resultant live range will be uncolorable.  Pessimistic

    95 // means we cannot coalesce if 2 live ranges interfere.  This implies we do

    96 // not hit a fixed point right away.

    97 class PhaseConservativeCoalesce : public PhaseCoalesce {

    98   IndexSet _ulr;               // Union live range interferences

    99 public:

   100   // Coalesce copies

   101   PhaseConservativeCoalesce( PhaseChaitin &chaitin );

   103   virtual void verify();

   105   // Conservatively coalesce copies in this block

   106   virtual void coalesce( Block *b );

   108   // Coalesce this chain of copies away

   109   bool copy_copy( Node *dst_copy, Node *src_copy, Block *b, uint bindex );

   111   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 );

   113   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);

   115   void update_ifg(uint lr1, uint lr2, IndexSet *n_lr1, IndexSet *n_lr2);

   116 };

   118 #endif // SHARE_VM_OPTO_COALESCE_HPP

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/opto/coalesce.hpp@ef57c43512d6

src/share/vm/opto/coalesce.hpp