Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/replacednodes.cpp @ 24234:ea6f94ab283b default tip
Added tag jvmci-0.36 for changeset 8128b98d4736
author | Gilles Duboscq <gilles.m.duboscq@oracle.com> |
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date | Mon, 18 Sep 2017 18:49:45 +0200 |
parents | 3ff8d0b5a04b |
children |
rev | line source |
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20327 | 1 /* |
2 * Copyright (c) 2014, 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. | |
22 * | |
23 */ | |
24 | |
25 #include "precompiled.hpp" | |
26 #include "opto/cfgnode.hpp" | |
27 #include "opto/phaseX.hpp" | |
28 #include "opto/replacednodes.hpp" | |
29 | |
30 void ReplacedNodes::allocate_if_necessary() { | |
31 if (_replaced_nodes == NULL) { | |
32 _replaced_nodes = new GrowableArray<ReplacedNode>(); | |
33 } | |
34 } | |
35 | |
36 bool ReplacedNodes::is_empty() const { | |
37 return _replaced_nodes == NULL || _replaced_nodes->length() == 0; | |
38 } | |
39 | |
40 bool ReplacedNodes::has_node(const ReplacedNode& r) const { | |
41 return _replaced_nodes->find(r) != -1; | |
42 } | |
43 | |
44 bool ReplacedNodes::has_target_node(Node* n) const { | |
45 for (int i = 0; i < _replaced_nodes->length(); i++) { | |
46 if (_replaced_nodes->at(i).improved() == n) { | |
47 return true; | |
48 } | |
49 } | |
50 return false; | |
51 } | |
52 | |
53 // Record replaced node if not seen before | |
54 void ReplacedNodes::record(Node* initial, Node* improved) { | |
55 allocate_if_necessary(); | |
56 ReplacedNode r(initial, improved); | |
57 if (!has_node(r)) { | |
58 _replaced_nodes->push(r); | |
59 } | |
60 } | |
61 | |
62 // Copy replaced nodes from one map to another. idx is used to | |
63 // identify nodes that are too new to be of interest in the target | |
64 // node list. | |
65 void ReplacedNodes::transfer_from(const ReplacedNodes& other, uint idx) { | |
66 if (other.is_empty()) { | |
67 return; | |
68 } | |
69 allocate_if_necessary(); | |
70 for (int i = 0; i < other._replaced_nodes->length(); i++) { | |
71 ReplacedNode replaced = other._replaced_nodes->at(i); | |
72 // Only transfer the nodes that can actually be useful | |
73 if (!has_node(replaced) && (replaced.initial()->_idx < idx || has_target_node(replaced.initial()))) { | |
74 _replaced_nodes->push(replaced); | |
75 } | |
76 } | |
77 } | |
78 | |
79 void ReplacedNodes::clone() { | |
80 if (_replaced_nodes != NULL) { | |
81 GrowableArray<ReplacedNode>* replaced_nodes_clone = new GrowableArray<ReplacedNode>(); | |
82 replaced_nodes_clone->appendAll(_replaced_nodes); | |
83 _replaced_nodes = replaced_nodes_clone; | |
84 } | |
85 } | |
86 | |
87 void ReplacedNodes::reset() { | |
88 if (_replaced_nodes != NULL) { | |
89 _replaced_nodes->clear(); | |
90 } | |
91 } | |
92 | |
93 // Perfom node replacement (used when returning to caller) | |
24204
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94 void ReplacedNodes::apply(Node* n, uint idx) { |
20327 | 95 if (is_empty()) { |
96 return; | |
97 } | |
98 for (int i = 0; i < _replaced_nodes->length(); i++) { | |
99 ReplacedNode replaced = _replaced_nodes->at(i); | |
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100 // Only apply if improved node was created in a callee to avoid |
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101 // issues with irreducible loops in the caller |
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102 if (replaced.improved()->_idx >= idx) { |
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103 n->replace_edge(replaced.initial(), replaced.improved()); |
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104 } |
20327 | 105 } |
106 } | |
107 | |
108 static void enqueue_use(Node* n, Node* use, Unique_Node_List& work) { | |
109 if (use->is_Phi()) { | |
110 Node* r = use->in(0); | |
111 assert(r->is_Region(), "Phi should have Region"); | |
112 for (uint i = 1; i < use->req(); i++) { | |
113 if (use->in(i) == n) { | |
114 work.push(r->in(i)); | |
115 } | |
116 } | |
117 } else { | |
118 work.push(use); | |
119 } | |
120 } | |
121 | |
122 // Perfom node replacement following late inlining | |
123 void ReplacedNodes::apply(Compile* C, Node* ctl) { | |
124 // ctl is the control on exit of the method that was late inlined | |
125 if (is_empty()) { | |
126 return; | |
127 } | |
128 for (int i = 0; i < _replaced_nodes->length(); i++) { | |
129 ReplacedNode replaced = _replaced_nodes->at(i); | |
130 Node* initial = replaced.initial(); | |
131 Node* improved = replaced.improved(); | |
132 assert (ctl != NULL && !ctl->is_top(), "replaced node should have actual control"); | |
133 | |
134 ResourceMark rm; | |
135 Unique_Node_List work; | |
136 // Go over all the uses of the node that is considered for replacement... | |
137 for (DUIterator j = initial->outs(); initial->has_out(j); j++) { | |
138 Node* use = initial->out(j); | |
139 | |
140 if (use == improved || use->outcnt() == 0) { | |
141 continue; | |
142 } | |
143 work.clear(); | |
144 enqueue_use(initial, use, work); | |
145 bool replace = true; | |
146 // Check that this use is dominated by ctl. Go ahead with the | |
147 // replacement if it is. | |
148 while (work.size() != 0 && replace) { | |
149 Node* n = work.pop(); | |
150 if (use->outcnt() == 0) { | |
151 continue; | |
152 } | |
153 if (n->is_CFG() || (n->in(0) != NULL && !n->in(0)->is_top())) { | |
154 int depth = 0; | |
155 Node *m = n; | |
156 if (!n->is_CFG()) { | |
157 n = n->in(0); | |
158 } | |
159 assert(n->is_CFG(), "should be CFG now"); | |
160 while(n != ctl) { | |
161 n = IfNode::up_one_dom(n); | |
162 depth++; | |
163 // limit search depth | |
164 if (depth >= 100 || n == NULL) { | |
165 replace = false; | |
166 break; | |
167 } | |
168 } | |
169 } else { | |
170 for (DUIterator k = n->outs(); n->has_out(k); k++) { | |
171 enqueue_use(n, n->out(k), work); | |
172 } | |
173 } | |
174 } | |
175 if (replace) { | |
176 bool is_in_table = C->initial_gvn()->hash_delete(use); | |
177 int replaced = use->replace_edge(initial, improved); | |
178 if (is_in_table) { | |
179 C->initial_gvn()->hash_find_insert(use); | |
180 } | |
181 C->record_for_igvn(use); | |
182 | |
183 assert(replaced > 0, "inconsistent"); | |
184 --j; | |
185 } | |
186 } | |
187 } | |
188 } | |
189 | |
190 void ReplacedNodes::dump(outputStream *st) const { | |
191 if (!is_empty()) { | |
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192 st->print("replaced nodes: "); |
20327 | 193 for (int i = 0; i < _replaced_nodes->length(); i++) { |
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194 st->print("%d->%d", _replaced_nodes->at(i).initial()->_idx, _replaced_nodes->at(i).improved()->_idx); |
20327 | 195 if (i < _replaced_nodes->length()-1) { |
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196 st->print(","); |
20327 | 197 } |
198 } | |
199 } | |
200 } | |
201 | |
202 // Merge 2 list of replaced node at a point where control flow paths merge | |
203 void ReplacedNodes::merge_with(const ReplacedNodes& other) { | |
204 if (is_empty()) { | |
205 return; | |
206 } | |
207 if (other.is_empty()) { | |
208 reset(); | |
209 return; | |
210 } | |
211 int shift = 0; | |
212 int len = _replaced_nodes->length(); | |
213 for (int i = 0; i < len; i++) { | |
214 if (!other.has_node(_replaced_nodes->at(i))) { | |
215 shift++; | |
216 } else if (shift > 0) { | |
217 _replaced_nodes->at_put(i-shift, _replaced_nodes->at(i)); | |
218 } | |
219 } | |
220 if (shift > 0) { | |
221 _replaced_nodes->trunc_to(len - shift); | |
222 } | |
223 } |