Mon, 23 Jun 2014 13:33:23 +0200
8046289: compiler/6340864/TestLongVect.java timeout with
Reviewed-by: iveresov, vlivanov
1 /*
2 * Copyright (c) 1997, 2013, 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
21 * questions.
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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 Matcher;
33 class PhaseIFG;
34 class PhaseCFG;
36 //------------------------------PhaseCoalesce----------------------------------
37 class PhaseCoalesce : public Phase {
38 protected:
39 PhaseChaitin &_phc;
41 public:
42 // Coalesce copies
43 PhaseCoalesce(PhaseChaitin &phc)
44 : Phase(Coalesce)
45 , _phc(phc) {}
47 virtual void verify() = 0;
49 // Coalesce copies
50 void coalesce_driver();
52 // Coalesce copies in this block
53 virtual void coalesce(Block *b) = 0;
55 // Attempt to coalesce live ranges defined by these 2
56 void combine_these_two(Node *n1, Node *n2);
58 LRG &lrgs(uint lidx) { return _phc.lrgs(lidx); }
59 #ifndef PRODUCT
60 // Dump internally name
61 void dump(Node *n) const;
62 // Dump whole shebang
63 void dump() const;
64 #endif
65 };
67 //------------------------------PhaseAggressiveCoalesce------------------------
68 // Aggressively, pessimistic coalesce copies. Aggressive means ignore graph
69 // colorability; perhaps coalescing to the point of forcing a spill.
70 // Pessimistic means we cannot coalesce if 2 live ranges interfere. This
71 // implies we do not hit a fixed point right away.
72 class PhaseAggressiveCoalesce : public PhaseCoalesce {
73 uint _unique;
74 public:
75 // Coalesce copies
76 PhaseAggressiveCoalesce( PhaseChaitin &chaitin ) : PhaseCoalesce(chaitin) {}
78 virtual void verify() { };
80 // Aggressively coalesce copies in this block
81 virtual void coalesce( Block *b );
83 // Where I fail to coalesce, manifest virtual copies as the Real Thing
84 void insert_copies( Matcher &matcher );
86 // Copy insertion needs some smarts in case live ranges overlap
87 void insert_copy_with_overlap( Block *b, Node *copy, uint dst_name, uint src_name );
88 };
91 //------------------------------PhaseConservativeCoalesce----------------------
92 // Conservatively, pessimistic coalesce copies. Conservative means do not
93 // coalesce if the resultant live range will be uncolorable. Pessimistic
94 // means we cannot coalesce if 2 live ranges interfere. This implies we do
95 // not hit a fixed point right away.
96 class PhaseConservativeCoalesce : public PhaseCoalesce {
97 IndexSet _ulr; // Union live range interferences
98 public:
99 // Coalesce copies
100 PhaseConservativeCoalesce( PhaseChaitin &chaitin );
102 virtual void verify();
104 // Conservatively coalesce copies in this block
105 virtual void coalesce( Block *b );
107 // Coalesce this chain of copies away
108 bool copy_copy( Node *dst_copy, Node *src_copy, Block *b, uint bindex );
110 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 );
112 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);
114 void update_ifg(uint lr1, uint lr2, IndexSet *n_lr1, IndexSet *n_lr2);
115 };
117 #endif // SHARE_VM_OPTO_COALESCE_HPP