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annotate src/share/vm/opto/coalesce.hpp @ 17541:4aa6fa2864af
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date | Thu, 23 Jan 2014 14:50:08 -0800 |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 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 | |
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7 * published by the Free Software Foundation. | |
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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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_COALESCE_HPP |
26 #define SHARE_VM_OPTO_COALESCE_HPP | |
27 | |
28 #include "opto/phase.hpp" | |
29 | |
0 | 30 class LoopTree; |
31 class LRG; | |
32 class Matcher; | |
33 class PhaseIFG; | |
34 class PhaseCFG; | |
35 | |
36 //------------------------------PhaseCoalesce---------------------------------- | |
37 class PhaseCoalesce : public Phase { | |
38 protected: | |
39 PhaseChaitin &_phc; | |
40 | |
41 public: | |
42 // Coalesce copies | |
10111 | 43 PhaseCoalesce(PhaseChaitin &phc) |
44 : Phase(Coalesce) | |
45 , _phc(phc) {} | |
0 | 46 |
47 virtual void verify() = 0; | |
48 | |
49 // Coalesce copies | |
10111 | 50 void coalesce_driver(); |
0 | 51 |
52 // Coalesce copies in this block | |
10111 | 53 virtual void coalesce(Block *b) = 0; |
0 | 54 |
55 // Attempt to coalesce live ranges defined by these 2 | |
10111 | 56 void combine_these_two(Node *n1, Node *n2); |
0 | 57 |
10111 | 58 LRG &lrgs(uint lidx) { return _phc.lrgs(lidx); } |
0 | 59 #ifndef PRODUCT |
60 // Dump internally name | |
10111 | 61 void dump(Node *n) const; |
0 | 62 // Dump whole shebang |
63 void dump() const; | |
64 #endif | |
65 }; | |
66 | |
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) {} | |
77 | |
78 virtual void verify() { }; | |
79 | |
80 // Aggressively coalesce copies in this block | |
81 virtual void coalesce( Block *b ); | |
82 | |
83 // Where I fail to coalesce, manifest virtual copies as the Real Thing | |
84 void insert_copies( Matcher &matcher ); | |
85 | |
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 }; | |
89 | |
90 | |
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 ); | |
101 | |
102 virtual void verify(); | |
103 | |
104 // Conservatively coalesce copies in this block | |
105 virtual void coalesce( Block *b ); | |
106 | |
107 // Coalesce this chain of copies away | |
108 bool copy_copy( Node *dst_copy, Node *src_copy, Block *b, uint bindex ); | |
109 | |
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 ); | |
111 | |
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); | |
113 | |
114 void update_ifg(uint lr1, uint lr2, IndexSet *n_lr1, IndexSet *n_lr2); | |
115 }; | |
1972 | 116 |
117 #endif // SHARE_VM_OPTO_COALESCE_HPP |