Mercurial > hg > truffle
annotate src/share/vm/opto/gcm.cpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 1077c8270209 |
children | 4ca6dc0799b6 |
rev | line source |
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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 | |
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 * | |
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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 #include "precompiled.hpp" |
26 #include "libadt/vectset.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/block.hpp" | |
29 #include "opto/c2compiler.hpp" | |
30 #include "opto/callnode.hpp" | |
31 #include "opto/cfgnode.hpp" | |
32 #include "opto/machnode.hpp" | |
33 #include "opto/opcodes.hpp" | |
34 #include "opto/phaseX.hpp" | |
35 #include "opto/rootnode.hpp" | |
36 #include "opto/runtime.hpp" | |
37 #include "runtime/deoptimization.hpp" | |
38 #ifdef TARGET_ARCH_MODEL_x86_32 | |
39 # include "adfiles/ad_x86_32.hpp" | |
40 #endif | |
41 #ifdef TARGET_ARCH_MODEL_x86_64 | |
42 # include "adfiles/ad_x86_64.hpp" | |
43 #endif | |
44 #ifdef TARGET_ARCH_MODEL_sparc | |
45 # include "adfiles/ad_sparc.hpp" | |
46 #endif | |
47 #ifdef TARGET_ARCH_MODEL_zero | |
48 # include "adfiles/ad_zero.hpp" | |
49 #endif | |
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50 #ifdef TARGET_ARCH_MODEL_arm |
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51 # include "adfiles/ad_arm.hpp" |
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52 #endif |
14391 | 53 #ifdef TARGET_ARCH_MODEL_ppc_32 |
54 # include "adfiles/ad_ppc_32.hpp" | |
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55 #endif |
14391 | 56 #ifdef TARGET_ARCH_MODEL_ppc_64 |
57 # include "adfiles/ad_ppc_64.hpp" | |
58 #endif | |
59 | |
1972 | 60 |
0 | 61 // Portions of code courtesy of Clifford Click |
62 | |
63 // Optimization - Graph Style | |
64 | |
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65 // To avoid float value underflow |
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66 #define MIN_BLOCK_FREQUENCY 1.e-35f |
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67 |
0 | 68 //----------------------------schedule_node_into_block------------------------- |
69 // Insert node n into block b. Look for projections of n and make sure they | |
70 // are in b also. | |
71 void PhaseCFG::schedule_node_into_block( Node *n, Block *b ) { | |
72 // Set basic block of n, Add n to b, | |
12023 | 73 map_node_to_block(n, b); |
0 | 74 b->add_inst(n); |
75 | |
76 // After Matching, nearly any old Node may have projections trailing it. | |
77 // These are usually machine-dependent flags. In any case, they might | |
78 // float to another block below this one. Move them up. | |
79 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
80 Node* use = n->fast_out(i); | |
81 if (use->is_Proj()) { | |
12023 | 82 Block* buse = get_block_for_node(use); |
0 | 83 if (buse != b) { // In wrong block? |
12023 | 84 if (buse != NULL) { |
0 | 85 buse->find_remove(use); // Remove from wrong block |
12023 | 86 } |
87 map_node_to_block(use, b); | |
0 | 88 b->add_inst(use); |
89 } | |
90 } | |
91 } | |
92 } | |
93 | |
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94 //----------------------------replace_block_proj_ctrl------------------------- |
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95 // Nodes that have is_block_proj() nodes as their control need to use |
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96 // the appropriate Region for their actual block as their control since |
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97 // the projection will be in a predecessor block. |
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98 void PhaseCFG::replace_block_proj_ctrl( Node *n ) { |
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99 const Node *in0 = n->in(0); |
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100 assert(in0 != NULL, "Only control-dependent"); |
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101 const Node *p = in0->is_block_proj(); |
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102 if (p != NULL && p != n) { // Control from a block projection? |
4115 | 103 assert(!n->pinned() || n->is_MachConstantBase(), "only pinned MachConstantBase node is expected here"); |
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104 // Find trailing Region |
12023 | 105 Block *pb = get_block_for_node(in0); // Block-projection already has basic block |
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106 uint j = 0; |
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107 if (pb->_num_succs != 1) { // More then 1 successor? |
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108 // Search for successor |
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109 uint max = pb->number_of_nodes(); |
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110 assert( max > 1, "" ); |
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111 uint start = max - pb->_num_succs; |
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112 // Find which output path belongs to projection |
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113 for (j = start; j < max; j++) { |
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114 if( pb->get_node(j) == in0 ) |
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115 break; |
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116 } |
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117 assert( j < max, "must find" ); |
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118 // Change control to match head of successor basic block |
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119 j -= start; |
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120 } |
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121 n->set_req(0, pb->_succs[j]->head()); |
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122 } |
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123 } |
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124 |
0 | 125 |
126 //------------------------------schedule_pinned_nodes-------------------------- | |
127 // Set the basic block for Nodes pinned into blocks | |
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128 void PhaseCFG::schedule_pinned_nodes(VectorSet &visited) { |
0 | 129 // Allocate node stack of size C->unique()+8 to avoid frequent realloc |
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130 GrowableArray <Node *> spstack(C->unique() + 8); |
0 | 131 spstack.push(_root); |
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132 while (spstack.is_nonempty()) { |
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133 Node* node = spstack.pop(); |
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134 if (!visited.test_set(node->_idx)) { // Test node and flag it as visited |
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135 if (node->pinned() && !has_block(node)) { // Pinned? Nail it down! |
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136 assert(node->in(0), "pinned Node must have Control"); |
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137 // Before setting block replace block_proj control edge |
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138 replace_block_proj_ctrl(node); |
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139 Node* input = node->in(0); |
12023 | 140 while (!input->is_block_start()) { |
0 | 141 input = input->in(0); |
12023 | 142 } |
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143 Block* block = get_block_for_node(input); // Basic block of controlling input |
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144 schedule_node_into_block(node, block); |
0 | 145 } |
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146 |
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147 // process all inputs that are non NULL |
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148 for (int i = node->req() - 1; i >= 0; --i) { |
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149 if (node->in(i) != NULL) { |
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150 spstack.push(node->in(i)); |
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151 } |
0 | 152 } |
153 } | |
154 } | |
155 } | |
156 | |
157 #ifdef ASSERT | |
158 // Assert that new input b2 is dominated by all previous inputs. | |
159 // Check this by by seeing that it is dominated by b1, the deepest | |
160 // input observed until b2. | |
12023 | 161 static void assert_dom(Block* b1, Block* b2, Node* n, const PhaseCFG* cfg) { |
0 | 162 if (b1 == NULL) return; |
163 assert(b1->_dom_depth < b2->_dom_depth, "sanity"); | |
164 Block* tmp = b2; | |
165 while (tmp != b1 && tmp != NULL) { | |
166 tmp = tmp->_idom; | |
167 } | |
168 if (tmp != b1) { | |
169 // Detected an unschedulable graph. Print some nice stuff and die. | |
170 tty->print_cr("!!! Unschedulable graph !!!"); | |
171 for (uint j=0; j<n->len(); j++) { // For all inputs | |
172 Node* inn = n->in(j); // Get input | |
173 if (inn == NULL) continue; // Ignore NULL, missing inputs | |
12023 | 174 Block* inb = cfg->get_block_for_node(inn); |
0 | 175 tty->print("B%d idom=B%d depth=%2d ",inb->_pre_order, |
176 inb->_idom ? inb->_idom->_pre_order : 0, inb->_dom_depth); | |
177 inn->dump(); | |
178 } | |
179 tty->print("Failing node: "); | |
180 n->dump(); | |
181 assert(false, "unscheduable graph"); | |
182 } | |
183 } | |
184 #endif | |
185 | |
12023 | 186 static Block* find_deepest_input(Node* n, const PhaseCFG* cfg) { |
0 | 187 // Find the last input dominated by all other inputs. |
188 Block* deepb = NULL; // Deepest block so far | |
189 int deepb_dom_depth = 0; | |
190 for (uint k = 0; k < n->len(); k++) { // For all inputs | |
191 Node* inn = n->in(k); // Get input | |
192 if (inn == NULL) continue; // Ignore NULL, missing inputs | |
12023 | 193 Block* inb = cfg->get_block_for_node(inn); |
0 | 194 assert(inb != NULL, "must already have scheduled this input"); |
195 if (deepb_dom_depth < (int) inb->_dom_depth) { | |
196 // The new inb must be dominated by the previous deepb. | |
197 // The various inputs must be linearly ordered in the dom | |
198 // tree, or else there will not be a unique deepest block. | |
12023 | 199 DEBUG_ONLY(assert_dom(deepb, inb, n, cfg)); |
0 | 200 deepb = inb; // Save deepest block |
201 deepb_dom_depth = deepb->_dom_depth; | |
202 } | |
203 } | |
204 assert(deepb != NULL, "must be at least one input to n"); | |
205 return deepb; | |
206 } | |
207 | |
208 | |
209 //------------------------------schedule_early--------------------------------- | |
210 // Find the earliest Block any instruction can be placed in. Some instructions | |
211 // are pinned into Blocks. Unpinned instructions can appear in last block in | |
212 // which all their inputs occur. | |
213 bool PhaseCFG::schedule_early(VectorSet &visited, Node_List &roots) { | |
214 // Allocate stack with enough space to avoid frequent realloc | |
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215 Node_Stack nstack(roots.Size() + 8); |
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216 // _root will be processed among C->top() inputs |
0 | 217 roots.push(C->top()); |
218 visited.set(C->top()->_idx); | |
219 | |
220 while (roots.size() != 0) { | |
221 // Use local variables nstack_top_n & nstack_top_i to cache values | |
222 // on stack's top. | |
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223 Node* parent_node = roots.pop(); |
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224 uint input_index = 0; |
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225 |
0 | 226 while (true) { |
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227 if (input_index == 0) { |
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228 // Fixup some control. Constants without control get attached |
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229 // to root and nodes that use is_block_proj() nodes should be attached |
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230 // to the region that starts their block. |
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231 const Node* control_input = parent_node->in(0); |
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232 if (control_input != NULL) { |
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233 replace_block_proj_ctrl(parent_node); |
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234 } else { |
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235 // Is a constant with NO inputs? |
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236 if (parent_node->req() == 1) { |
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237 parent_node->set_req(0, _root); |
0 | 238 } |
239 } | |
240 } | |
241 | |
242 // First, visit all inputs and force them to get a block. If an | |
243 // input is already in a block we quit following inputs (to avoid | |
244 // cycles). Instead we put that Node on a worklist to be handled | |
245 // later (since IT'S inputs may not have a block yet). | |
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246 |
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247 // Assume all n's inputs will be processed |
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248 bool done = true; |
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249 |
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250 while (input_index < parent_node->len()) { |
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251 Node* in = parent_node->in(input_index++); |
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252 if (in == NULL) { |
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253 continue; |
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254 } |
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255 |
0 | 256 int is_visited = visited.test_set(in->_idx); |
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257 if (!has_block(in)) { |
0 | 258 if (is_visited) { |
259 return false; | |
260 } | |
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261 // Save parent node and next input's index. |
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262 nstack.push(parent_node, input_index); |
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263 // Process current input now. |
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264 parent_node = in; |
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265 input_index = 0; |
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266 // Not all n's inputs processed. |
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267 done = false; |
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268 break; |
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269 } else if (!is_visited) { |
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270 // Visit this guy later, using worklist |
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271 roots.push(in); |
0 | 272 } |
273 } | |
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274 |
0 | 275 if (done) { |
276 // All of n's inputs have been processed, complete post-processing. | |
277 | |
278 // Some instructions are pinned into a block. These include Region, | |
279 // Phi, Start, Return, and other control-dependent instructions and | |
280 // any projections which depend on them. | |
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281 if (!parent_node->pinned()) { |
0 | 282 // Set earliest legal block. |
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283 Block* earliest_block = find_deepest_input(parent_node, this); |
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284 map_node_to_block(parent_node, earliest_block); |
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285 } else { |
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286 assert(get_block_for_node(parent_node) == get_block_for_node(parent_node->in(0)), "Pinned Node should be at the same block as its control edge"); |
0 | 287 } |
288 | |
289 if (nstack.is_empty()) { | |
290 // Finished all nodes on stack. | |
291 // Process next node on the worklist 'roots'. | |
292 break; | |
293 } | |
294 // Get saved parent node and next input's index. | |
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295 parent_node = nstack.node(); |
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296 input_index = nstack.index(); |
0 | 297 nstack.pop(); |
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298 } |
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299 } |
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300 } |
0 | 301 return true; |
302 } | |
303 | |
304 //------------------------------dom_lca---------------------------------------- | |
305 // Find least common ancestor in dominator tree | |
306 // LCA is a current notion of LCA, to be raised above 'this'. | |
307 // As a convenient boundary condition, return 'this' if LCA is NULL. | |
308 // Find the LCA of those two nodes. | |
309 Block* Block::dom_lca(Block* LCA) { | |
310 if (LCA == NULL || LCA == this) return this; | |
311 | |
312 Block* anc = this; | |
313 while (anc->_dom_depth > LCA->_dom_depth) | |
314 anc = anc->_idom; // Walk up till anc is as high as LCA | |
315 | |
316 while (LCA->_dom_depth > anc->_dom_depth) | |
317 LCA = LCA->_idom; // Walk up till LCA is as high as anc | |
318 | |
319 while (LCA != anc) { // Walk both up till they are the same | |
320 LCA = LCA->_idom; | |
321 anc = anc->_idom; | |
322 } | |
323 | |
324 return LCA; | |
325 } | |
326 | |
327 //--------------------------raise_LCA_above_use-------------------------------- | |
328 // We are placing a definition, and have been given a def->use edge. | |
329 // The definition must dominate the use, so move the LCA upward in the | |
330 // dominator tree to dominate the use. If the use is a phi, adjust | |
331 // the LCA only with the phi input paths which actually use this def. | |
12023 | 332 static Block* raise_LCA_above_use(Block* LCA, Node* use, Node* def, const PhaseCFG* cfg) { |
333 Block* buse = cfg->get_block_for_node(use); | |
0 | 334 if (buse == NULL) return LCA; // Unused killing Projs have no use block |
335 if (!use->is_Phi()) return buse->dom_lca(LCA); | |
336 uint pmax = use->req(); // Number of Phi inputs | |
337 // Why does not this loop just break after finding the matching input to | |
338 // the Phi? Well...it's like this. I do not have true def-use/use-def | |
339 // chains. Means I cannot distinguish, from the def-use direction, which | |
340 // of many use-defs lead from the same use to the same def. That is, this | |
341 // Phi might have several uses of the same def. Each use appears in a | |
342 // different predecessor block. But when I enter here, I cannot distinguish | |
343 // which use-def edge I should find the predecessor block for. So I find | |
344 // them all. Means I do a little extra work if a Phi uses the same value | |
345 // more than once. | |
346 for (uint j=1; j<pmax; j++) { // For all inputs | |
347 if (use->in(j) == def) { // Found matching input? | |
12023 | 348 Block* pred = cfg->get_block_for_node(buse->pred(j)); |
0 | 349 LCA = pred->dom_lca(LCA); |
350 } | |
351 } | |
352 return LCA; | |
353 } | |
354 | |
355 //----------------------------raise_LCA_above_marks---------------------------- | |
356 // Return a new LCA that dominates LCA and any of its marked predecessors. | |
357 // Search all my parents up to 'early' (exclusive), looking for predecessors | |
358 // which are marked with the given index. Return the LCA (in the dom tree) | |
359 // of all marked blocks. If there are none marked, return the original | |
360 // LCA. | |
12023 | 361 static Block* raise_LCA_above_marks(Block* LCA, node_idx_t mark, Block* early, const PhaseCFG* cfg) { |
0 | 362 Block_List worklist; |
363 worklist.push(LCA); | |
364 while (worklist.size() > 0) { | |
365 Block* mid = worklist.pop(); | |
366 if (mid == early) continue; // stop searching here | |
367 | |
368 // Test and set the visited bit. | |
369 if (mid->raise_LCA_visited() == mark) continue; // already visited | |
370 | |
371 // Don't process the current LCA, otherwise the search may terminate early | |
372 if (mid != LCA && mid->raise_LCA_mark() == mark) { | |
373 // Raise the LCA. | |
374 LCA = mid->dom_lca(LCA); | |
375 if (LCA == early) break; // stop searching everywhere | |
376 assert(early->dominates(LCA), "early is high enough"); | |
377 // Resume searching at that point, skipping intermediate levels. | |
378 worklist.push(LCA); | |
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379 if (LCA == mid) |
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380 continue; // Don't mark as visited to avoid early termination. |
0 | 381 } else { |
382 // Keep searching through this block's predecessors. | |
383 for (uint j = 1, jmax = mid->num_preds(); j < jmax; j++) { | |
12023 | 384 Block* mid_parent = cfg->get_block_for_node(mid->pred(j)); |
0 | 385 worklist.push(mid_parent); |
386 } | |
387 } | |
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388 mid->set_raise_LCA_visited(mark); |
0 | 389 } |
390 return LCA; | |
391 } | |
392 | |
393 //--------------------------memory_early_block-------------------------------- | |
394 // This is a variation of find_deepest_input, the heart of schedule_early. | |
395 // Find the "early" block for a load, if we considered only memory and | |
396 // address inputs, that is, if other data inputs were ignored. | |
397 // | |
398 // Because a subset of edges are considered, the resulting block will | |
399 // be earlier (at a shallower dom_depth) than the true schedule_early | |
400 // point of the node. We compute this earlier block as a more permissive | |
401 // site for anti-dependency insertion, but only if subsume_loads is enabled. | |
12023 | 402 static Block* memory_early_block(Node* load, Block* early, const PhaseCFG* cfg) { |
0 | 403 Node* base; |
404 Node* index; | |
405 Node* store = load->in(MemNode::Memory); | |
406 load->as_Mach()->memory_inputs(base, index); | |
407 | |
408 assert(base != NodeSentinel && index != NodeSentinel, | |
409 "unexpected base/index inputs"); | |
410 | |
411 Node* mem_inputs[4]; | |
412 int mem_inputs_length = 0; | |
413 if (base != NULL) mem_inputs[mem_inputs_length++] = base; | |
414 if (index != NULL) mem_inputs[mem_inputs_length++] = index; | |
415 if (store != NULL) mem_inputs[mem_inputs_length++] = store; | |
416 | |
417 // In the comparision below, add one to account for the control input, | |
418 // which may be null, but always takes up a spot in the in array. | |
419 if (mem_inputs_length + 1 < (int) load->req()) { | |
420 // This "load" has more inputs than just the memory, base and index inputs. | |
421 // For purposes of checking anti-dependences, we need to start | |
422 // from the early block of only the address portion of the instruction, | |
423 // and ignore other blocks that may have factored into the wider | |
424 // schedule_early calculation. | |
425 if (load->in(0) != NULL) mem_inputs[mem_inputs_length++] = load->in(0); | |
426 | |
427 Block* deepb = NULL; // Deepest block so far | |
428 int deepb_dom_depth = 0; | |
429 for (int i = 0; i < mem_inputs_length; i++) { | |
12023 | 430 Block* inb = cfg->get_block_for_node(mem_inputs[i]); |
0 | 431 if (deepb_dom_depth < (int) inb->_dom_depth) { |
432 // The new inb must be dominated by the previous deepb. | |
433 // The various inputs must be linearly ordered in the dom | |
434 // tree, or else there will not be a unique deepest block. | |
12023 | 435 DEBUG_ONLY(assert_dom(deepb, inb, load, cfg)); |
0 | 436 deepb = inb; // Save deepest block |
437 deepb_dom_depth = deepb->_dom_depth; | |
438 } | |
439 } | |
440 early = deepb; | |
441 } | |
442 | |
443 return early; | |
444 } | |
445 | |
446 //--------------------------insert_anti_dependences--------------------------- | |
447 // A load may need to witness memory that nearby stores can overwrite. | |
448 // For each nearby store, either insert an "anti-dependence" edge | |
449 // from the load to the store, or else move LCA upward to force the | |
450 // load to (eventually) be scheduled in a block above the store. | |
451 // | |
452 // Do not add edges to stores on distinct control-flow paths; | |
453 // only add edges to stores which might interfere. | |
454 // | |
455 // Return the (updated) LCA. There will not be any possibly interfering | |
456 // store between the load's "early block" and the updated LCA. | |
457 // Any stores in the updated LCA will have new precedence edges | |
458 // back to the load. The caller is expected to schedule the load | |
459 // in the LCA, in which case the precedence edges will make LCM | |
460 // preserve anti-dependences. The caller may also hoist the load | |
461 // above the LCA, if it is not the early block. | |
462 Block* PhaseCFG::insert_anti_dependences(Block* LCA, Node* load, bool verify) { | |
463 assert(load->needs_anti_dependence_check(), "must be a load of some sort"); | |
464 assert(LCA != NULL, ""); | |
465 DEBUG_ONLY(Block* LCA_orig = LCA); | |
466 | |
467 // Compute the alias index. Loads and stores with different alias indices | |
468 // do not need anti-dependence edges. | |
469 uint load_alias_idx = C->get_alias_index(load->adr_type()); | |
470 #ifdef ASSERT | |
471 if (load_alias_idx == Compile::AliasIdxBot && C->AliasLevel() > 0 && | |
472 (PrintOpto || VerifyAliases || | |
473 PrintMiscellaneous && (WizardMode || Verbose))) { | |
474 // Load nodes should not consume all of memory. | |
475 // Reporting a bottom type indicates a bug in adlc. | |
476 // If some particular type of node validly consumes all of memory, | |
477 // sharpen the preceding "if" to exclude it, so we can catch bugs here. | |
478 tty->print_cr("*** Possible Anti-Dependence Bug: Load consumes all of memory."); | |
479 load->dump(2); | |
480 if (VerifyAliases) assert(load_alias_idx != Compile::AliasIdxBot, ""); | |
481 } | |
482 #endif | |
483 assert(load_alias_idx || (load->is_Mach() && load->as_Mach()->ideal_Opcode() == Op_StrComp), | |
484 "String compare is only known 'load' that does not conflict with any stores"); | |
681 | 485 assert(load_alias_idx || (load->is_Mach() && load->as_Mach()->ideal_Opcode() == Op_StrEquals), |
486 "String equals is a 'load' that does not conflict with any stores"); | |
487 assert(load_alias_idx || (load->is_Mach() && load->as_Mach()->ideal_Opcode() == Op_StrIndexOf), | |
488 "String indexOf is a 'load' that does not conflict with any stores"); | |
489 assert(load_alias_idx || (load->is_Mach() && load->as_Mach()->ideal_Opcode() == Op_AryEq), | |
490 "Arrays equals is a 'load' that do not conflict with any stores"); | |
0 | 491 |
492 if (!C->alias_type(load_alias_idx)->is_rewritable()) { | |
493 // It is impossible to spoil this load by putting stores before it, | |
494 // because we know that the stores will never update the value | |
495 // which 'load' must witness. | |
496 return LCA; | |
497 } | |
498 | |
499 node_idx_t load_index = load->_idx; | |
500 | |
501 // Note the earliest legal placement of 'load', as determined by | |
502 // by the unique point in the dom tree where all memory effects | |
503 // and other inputs are first available. (Computed by schedule_early.) | |
504 // For normal loads, 'early' is the shallowest place (dom graph wise) | |
505 // to look for anti-deps between this load and any store. | |
12023 | 506 Block* early = get_block_for_node(load); |
0 | 507 |
508 // If we are subsuming loads, compute an "early" block that only considers | |
509 // memory or address inputs. This block may be different than the | |
510 // schedule_early block in that it could be at an even shallower depth in the | |
511 // dominator tree, and allow for a broader discovery of anti-dependences. | |
512 if (C->subsume_loads()) { | |
12023 | 513 early = memory_early_block(load, early, this); |
0 | 514 } |
515 | |
516 ResourceArea *area = Thread::current()->resource_area(); | |
517 Node_List worklist_mem(area); // prior memory state to store | |
518 Node_List worklist_store(area); // possible-def to explore | |
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519 Node_List worklist_visited(area); // visited mergemem nodes |
0 | 520 Node_List non_early_stores(area); // all relevant stores outside of early |
521 bool must_raise_LCA = false; | |
522 | |
523 #ifdef TRACK_PHI_INPUTS | |
524 // %%% This extra checking fails because MergeMem nodes are not GVNed. | |
525 // Provide "phi_inputs" to check if every input to a PhiNode is from the | |
526 // original memory state. This indicates a PhiNode for which should not | |
527 // prevent the load from sinking. For such a block, set_raise_LCA_mark | |
528 // may be overly conservative. | |
529 // Mechanism: count inputs seen for each Phi encountered in worklist_store. | |
530 DEBUG_ONLY(GrowableArray<uint> phi_inputs(area, C->unique(),0,0)); | |
531 #endif | |
532 | |
533 // 'load' uses some memory state; look for users of the same state. | |
534 // Recurse through MergeMem nodes to the stores that use them. | |
535 | |
536 // Each of these stores is a possible definition of memory | |
537 // that 'load' needs to use. We need to force 'load' | |
538 // to occur before each such store. When the store is in | |
539 // the same block as 'load', we insert an anti-dependence | |
540 // edge load->store. | |
541 | |
542 // The relevant stores "nearby" the load consist of a tree rooted | |
543 // at initial_mem, with internal nodes of type MergeMem. | |
544 // Therefore, the branches visited by the worklist are of this form: | |
545 // initial_mem -> (MergeMem ->)* store | |
546 // The anti-dependence constraints apply only to the fringe of this tree. | |
547 | |
548 Node* initial_mem = load->in(MemNode::Memory); | |
549 worklist_store.push(initial_mem); | |
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550 worklist_visited.push(initial_mem); |
0 | 551 worklist_mem.push(NULL); |
552 while (worklist_store.size() > 0) { | |
553 // Examine a nearby store to see if it might interfere with our load. | |
554 Node* mem = worklist_mem.pop(); | |
555 Node* store = worklist_store.pop(); | |
556 uint op = store->Opcode(); | |
557 | |
558 // MergeMems do not directly have anti-deps. | |
559 // Treat them as internal nodes in a forward tree of memory states, | |
560 // the leaves of which are each a 'possible-def'. | |
561 if (store == initial_mem // root (exclusive) of tree we are searching | |
562 || op == Op_MergeMem // internal node of tree we are searching | |
563 ) { | |
564 mem = store; // It's not a possibly interfering store. | |
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565 if (store == initial_mem) |
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566 initial_mem = NULL; // only process initial memory once |
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567 |
0 | 568 for (DUIterator_Fast imax, i = mem->fast_outs(imax); i < imax; i++) { |
569 store = mem->fast_out(i); | |
570 if (store->is_MergeMem()) { | |
571 // Be sure we don't get into combinatorial problems. | |
572 // (Allow phis to be repeated; they can merge two relevant states.) | |
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573 uint j = worklist_visited.size(); |
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574 for (; j > 0; j--) { |
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575 if (worklist_visited.at(j-1) == store) break; |
0 | 576 } |
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577 if (j > 0) continue; // already on work list; do not repeat |
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578 worklist_visited.push(store); |
0 | 579 } |
580 worklist_mem.push(mem); | |
581 worklist_store.push(store); | |
582 } | |
583 continue; | |
584 } | |
585 | |
586 if (op == Op_MachProj || op == Op_Catch) continue; | |
587 if (store->needs_anti_dependence_check()) continue; // not really a store | |
588 | |
589 // Compute the alias index. Loads and stores with different alias | |
590 // indices do not need anti-dependence edges. Wide MemBar's are | |
591 // anti-dependent on everything (except immutable memories). | |
592 const TypePtr* adr_type = store->adr_type(); | |
593 if (!C->can_alias(adr_type, load_alias_idx)) continue; | |
594 | |
595 // Most slow-path runtime calls do NOT modify Java memory, but | |
596 // they can block and so write Raw memory. | |
597 if (store->is_Mach()) { | |
598 MachNode* mstore = store->as_Mach(); | |
599 if (load_alias_idx != Compile::AliasIdxRaw) { | |
600 // Check for call into the runtime using the Java calling | |
601 // convention (and from there into a wrapper); it has no | |
602 // _method. Can't do this optimization for Native calls because | |
603 // they CAN write to Java memory. | |
604 if (mstore->ideal_Opcode() == Op_CallStaticJava) { | |
605 assert(mstore->is_MachSafePoint(), ""); | |
606 MachSafePointNode* ms = (MachSafePointNode*) mstore; | |
607 assert(ms->is_MachCallJava(), ""); | |
608 MachCallJavaNode* mcj = (MachCallJavaNode*) ms; | |
609 if (mcj->_method == NULL) { | |
610 // These runtime calls do not write to Java visible memory | |
611 // (other than Raw) and so do not require anti-dependence edges. | |
612 continue; | |
613 } | |
614 } | |
615 // Same for SafePoints: they read/write Raw but only read otherwise. | |
616 // This is basically a workaround for SafePoints only defining control | |
617 // instead of control + memory. | |
618 if (mstore->ideal_Opcode() == Op_SafePoint) | |
619 continue; | |
620 } else { | |
621 // Some raw memory, such as the load of "top" at an allocation, | |
622 // can be control dependent on the previous safepoint. See | |
623 // comments in GraphKit::allocate_heap() about control input. | |
624 // Inserting an anti-dep between such a safepoint and a use | |
625 // creates a cycle, and will cause a subsequent failure in | |
626 // local scheduling. (BugId 4919904) | |
627 // (%%% How can a control input be a safepoint and not a projection??) | |
628 if (mstore->ideal_Opcode() == Op_SafePoint && load->in(0) == mstore) | |
629 continue; | |
630 } | |
631 } | |
632 | |
633 // Identify a block that the current load must be above, | |
634 // or else observe that 'store' is all the way up in the | |
635 // earliest legal block for 'load'. In the latter case, | |
636 // immediately insert an anti-dependence edge. | |
12023 | 637 Block* store_block = get_block_for_node(store); |
0 | 638 assert(store_block != NULL, "unused killing projections skipped above"); |
639 | |
640 if (store->is_Phi()) { | |
641 // 'load' uses memory which is one (or more) of the Phi's inputs. | |
642 // It must be scheduled not before the Phi, but rather before | |
643 // each of the relevant Phi inputs. | |
644 // | |
645 // Instead of finding the LCA of all inputs to a Phi that match 'mem', | |
646 // we mark each corresponding predecessor block and do a combined | |
647 // hoisting operation later (raise_LCA_above_marks). | |
648 // | |
649 // Do not assert(store_block != early, "Phi merging memory after access") | |
650 // PhiNode may be at start of block 'early' with backedge to 'early' | |
651 DEBUG_ONLY(bool found_match = false); | |
652 for (uint j = PhiNode::Input, jmax = store->req(); j < jmax; j++) { | |
653 if (store->in(j) == mem) { // Found matching input? | |
654 DEBUG_ONLY(found_match = true); | |
12023 | 655 Block* pred_block = get_block_for_node(store_block->pred(j)); |
0 | 656 if (pred_block != early) { |
657 // If any predecessor of the Phi matches the load's "early block", | |
658 // we do not need a precedence edge between the Phi and 'load' | |
605 | 659 // since the load will be forced into a block preceding the Phi. |
0 | 660 pred_block->set_raise_LCA_mark(load_index); |
661 assert(!LCA_orig->dominates(pred_block) || | |
662 early->dominates(pred_block), "early is high enough"); | |
663 must_raise_LCA = true; | |
788 | 664 } else { |
665 // anti-dependent upon PHI pinned below 'early', no edge needed | |
666 LCA = early; // but can not schedule below 'early' | |
0 | 667 } |
668 } | |
669 } | |
670 assert(found_match, "no worklist bug"); | |
671 #ifdef TRACK_PHI_INPUTS | |
672 #ifdef ASSERT | |
673 // This assert asks about correct handling of PhiNodes, which may not | |
674 // have all input edges directly from 'mem'. See BugId 4621264 | |
675 int num_mem_inputs = phi_inputs.at_grow(store->_idx,0) + 1; | |
676 // Increment by exactly one even if there are multiple copies of 'mem' | |
677 // coming into the phi, because we will run this block several times | |
678 // if there are several copies of 'mem'. (That's how DU iterators work.) | |
679 phi_inputs.at_put(store->_idx, num_mem_inputs); | |
680 assert(PhiNode::Input + num_mem_inputs < store->req(), | |
681 "Expect at least one phi input will not be from original memory state"); | |
682 #endif //ASSERT | |
683 #endif //TRACK_PHI_INPUTS | |
684 } else if (store_block != early) { | |
685 // 'store' is between the current LCA and earliest possible block. | |
686 // Label its block, and decide later on how to raise the LCA | |
687 // to include the effect on LCA of this store. | |
688 // If this store's block gets chosen as the raised LCA, we | |
689 // will find him on the non_early_stores list and stick him | |
690 // with a precedence edge. | |
691 // (But, don't bother if LCA is already raised all the way.) | |
692 if (LCA != early) { | |
693 store_block->set_raise_LCA_mark(load_index); | |
694 must_raise_LCA = true; | |
695 non_early_stores.push(store); | |
696 } | |
697 } else { | |
698 // Found a possibly-interfering store in the load's 'early' block. | |
699 // This means 'load' cannot sink at all in the dominator tree. | |
700 // Add an anti-dep edge, and squeeze 'load' into the highest block. | |
701 assert(store != load->in(0), "dependence cycle found"); | |
702 if (verify) { | |
703 assert(store->find_edge(load) != -1, "missing precedence edge"); | |
704 } else { | |
705 store->add_prec(load); | |
706 } | |
707 LCA = early; | |
708 // This turns off the process of gathering non_early_stores. | |
709 } | |
710 } | |
711 // (Worklist is now empty; all nearby stores have been visited.) | |
712 | |
713 // Finished if 'load' must be scheduled in its 'early' block. | |
714 // If we found any stores there, they have already been given | |
715 // precedence edges. | |
716 if (LCA == early) return LCA; | |
717 | |
718 // We get here only if there are no possibly-interfering stores | |
719 // in the load's 'early' block. Move LCA up above all predecessors | |
720 // which contain stores we have noted. | |
721 // | |
722 // The raised LCA block can be a home to such interfering stores, | |
723 // but its predecessors must not contain any such stores. | |
724 // | |
725 // The raised LCA will be a lower bound for placing the load, | |
726 // preventing the load from sinking past any block containing | |
727 // a store that may invalidate the memory state required by 'load'. | |
728 if (must_raise_LCA) | |
12023 | 729 LCA = raise_LCA_above_marks(LCA, load->_idx, early, this); |
0 | 730 if (LCA == early) return LCA; |
731 | |
732 // Insert anti-dependence edges from 'load' to each store | |
733 // in the non-early LCA block. | |
734 // Mine the non_early_stores list for such stores. | |
735 if (LCA->raise_LCA_mark() == load_index) { | |
736 while (non_early_stores.size() > 0) { | |
737 Node* store = non_early_stores.pop(); | |
12023 | 738 Block* store_block = get_block_for_node(store); |
0 | 739 if (store_block == LCA) { |
740 // add anti_dependence from store to load in its own block | |
741 assert(store != load->in(0), "dependence cycle found"); | |
742 if (verify) { | |
743 assert(store->find_edge(load) != -1, "missing precedence edge"); | |
744 } else { | |
745 store->add_prec(load); | |
746 } | |
747 } else { | |
748 assert(store_block->raise_LCA_mark() == load_index, "block was marked"); | |
749 // Any other stores we found must be either inside the new LCA | |
750 // or else outside the original LCA. In the latter case, they | |
751 // did not interfere with any use of 'load'. | |
752 assert(LCA->dominates(store_block) | |
753 || !LCA_orig->dominates(store_block), "no stray stores"); | |
754 } | |
755 } | |
756 } | |
757 | |
758 // Return the highest block containing stores; any stores | |
759 // within that block have been given anti-dependence edges. | |
760 return LCA; | |
761 } | |
762 | |
763 // This class is used to iterate backwards over the nodes in the graph. | |
764 | |
765 class Node_Backward_Iterator { | |
766 | |
767 private: | |
768 Node_Backward_Iterator(); | |
769 | |
770 public: | |
771 // Constructor for the iterator | |
12023 | 772 Node_Backward_Iterator(Node *root, VectorSet &visited, Node_List &stack, PhaseCFG &cfg); |
0 | 773 |
774 // Postincrement operator to iterate over the nodes | |
775 Node *next(); | |
776 | |
777 private: | |
778 VectorSet &_visited; | |
779 Node_List &_stack; | |
12023 | 780 PhaseCFG &_cfg; |
0 | 781 }; |
782 | |
783 // Constructor for the Node_Backward_Iterator | |
12023 | 784 Node_Backward_Iterator::Node_Backward_Iterator( Node *root, VectorSet &visited, Node_List &stack, PhaseCFG &cfg) |
785 : _visited(visited), _stack(stack), _cfg(cfg) { | |
0 | 786 // The stack should contain exactly the root |
787 stack.clear(); | |
788 stack.push(root); | |
789 | |
790 // Clear the visited bits | |
791 visited.Clear(); | |
792 } | |
793 | |
794 // Iterator for the Node_Backward_Iterator | |
795 Node *Node_Backward_Iterator::next() { | |
796 | |
797 // If the _stack is empty, then just return NULL: finished. | |
798 if ( !_stack.size() ) | |
799 return NULL; | |
800 | |
801 // '_stack' is emulating a real _stack. The 'visit-all-users' loop has been | |
802 // made stateless, so I do not need to record the index 'i' on my _stack. | |
803 // Instead I visit all users each time, scanning for unvisited users. | |
804 // I visit unvisited not-anti-dependence users first, then anti-dependent | |
805 // children next. | |
806 Node *self = _stack.pop(); | |
807 | |
808 // I cycle here when I am entering a deeper level of recursion. | |
809 // The key variable 'self' was set prior to jumping here. | |
810 while( 1 ) { | |
811 | |
812 _visited.set(self->_idx); | |
813 | |
814 // Now schedule all uses as late as possible. | |
12023 | 815 const Node* src = self->is_Proj() ? self->in(0) : self; |
816 uint src_rpo = _cfg.get_block_for_node(src)->_rpo; | |
0 | 817 |
818 // Schedule all nodes in a post-order visit | |
819 Node *unvisited = NULL; // Unvisited anti-dependent Node, if any | |
820 | |
821 // Scan for unvisited nodes | |
822 for (DUIterator_Fast imax, i = self->fast_outs(imax); i < imax; i++) { | |
823 // For all uses, schedule late | |
824 Node* n = self->fast_out(i); // Use | |
825 | |
826 // Skip already visited children | |
827 if ( _visited.test(n->_idx) ) | |
828 continue; | |
829 | |
830 // do not traverse backward control edges | |
831 Node *use = n->is_Proj() ? n->in(0) : n; | |
12023 | 832 uint use_rpo = _cfg.get_block_for_node(use)->_rpo; |
0 | 833 |
834 if ( use_rpo < src_rpo ) | |
835 continue; | |
836 | |
837 // Phi nodes always precede uses in a basic block | |
838 if ( use_rpo == src_rpo && use->is_Phi() ) | |
839 continue; | |
840 | |
841 unvisited = n; // Found unvisited | |
842 | |
843 // Check for possible-anti-dependent | |
844 if( !n->needs_anti_dependence_check() ) | |
845 break; // Not visited, not anti-dep; schedule it NOW | |
846 } | |
847 | |
848 // Did I find an unvisited not-anti-dependent Node? | |
849 if ( !unvisited ) | |
850 break; // All done with children; post-visit 'self' | |
851 | |
852 // Visit the unvisited Node. Contains the obvious push to | |
853 // indicate I'm entering a deeper level of recursion. I push the | |
854 // old state onto the _stack and set a new state and loop (recurse). | |
855 _stack.push(self); | |
856 self = unvisited; | |
857 } // End recursion loop | |
858 | |
859 return self; | |
860 } | |
861 | |
862 //------------------------------ComputeLatenciesBackwards---------------------- | |
863 // Compute the latency of all the instructions. | |
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864 void PhaseCFG::compute_latencies_backwards(VectorSet &visited, Node_List &stack) { |
0 | 865 #ifndef PRODUCT |
866 if (trace_opto_pipelining()) | |
867 tty->print("\n#---- ComputeLatenciesBackwards ----\n"); | |
868 #endif | |
869 | |
12023 | 870 Node_Backward_Iterator iter((Node *)_root, visited, stack, *this); |
0 | 871 Node *n; |
872 | |
873 // Walk over all the nodes from last to first | |
874 while (n = iter.next()) { | |
875 // Set the latency for the definitions of this instruction | |
876 partial_latency_of_defs(n); | |
877 } | |
878 } // end ComputeLatenciesBackwards | |
879 | |
880 //------------------------------partial_latency_of_defs------------------------ | |
881 // Compute the latency impact of this node on all defs. This computes | |
882 // a number that increases as we approach the beginning of the routine. | |
883 void PhaseCFG::partial_latency_of_defs(Node *n) { | |
884 // Set the latency for this instruction | |
885 #ifndef PRODUCT | |
886 if (trace_opto_pipelining()) { | |
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887 tty->print("# latency_to_inputs: node_latency[%d] = %d for node", n->_idx, get_latency_for_node(n)); |
0 | 888 dump(); |
889 } | |
890 #endif | |
891 | |
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892 if (n->is_Proj()) { |
0 | 893 n = n->in(0); |
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894 } |
0 | 895 |
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896 if (n->is_Root()) { |
0 | 897 return; |
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898 } |
0 | 899 |
900 uint nlen = n->len(); | |
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901 uint use_latency = get_latency_for_node(n); |
12023 | 902 uint use_pre_order = get_block_for_node(n)->_pre_order; |
0 | 903 |
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904 for (uint j = 0; j < nlen; j++) { |
0 | 905 Node *def = n->in(j); |
906 | |
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907 if (!def || def == n) { |
0 | 908 continue; |
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909 } |
0 | 910 |
911 // Walk backwards thru projections | |
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912 if (def->is_Proj()) { |
0 | 913 def = def->in(0); |
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914 } |
0 | 915 |
916 #ifndef PRODUCT | |
917 if (trace_opto_pipelining()) { | |
918 tty->print("# in(%2d): ", j); | |
919 def->dump(); | |
920 } | |
921 #endif | |
922 | |
923 // If the defining block is not known, assume it is ok | |
12023 | 924 Block *def_block = get_block_for_node(def); |
0 | 925 uint def_pre_order = def_block ? def_block->_pre_order : 0; |
926 | |
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927 if ((use_pre_order < def_pre_order) || (use_pre_order == def_pre_order && n->is_Phi())) { |
0 | 928 continue; |
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929 } |
0 | 930 |
931 uint delta_latency = n->latency(j); | |
932 uint current_latency = delta_latency + use_latency; | |
933 | |
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934 if (get_latency_for_node(def) < current_latency) { |
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935 set_latency_for_node(def, current_latency); |
0 | 936 } |
937 | |
938 #ifndef PRODUCT | |
939 if (trace_opto_pipelining()) { | |
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940 tty->print_cr("# %d + edge_latency(%d) == %d -> %d, node_latency[%d] = %d", use_latency, j, delta_latency, current_latency, def->_idx, get_latency_for_node(def)); |
0 | 941 } |
942 #endif | |
943 } | |
944 } | |
945 | |
946 //------------------------------latency_from_use------------------------------- | |
947 // Compute the latency of a specific use | |
948 int PhaseCFG::latency_from_use(Node *n, const Node *def, Node *use) { | |
949 // If self-reference, return no latency | |
12023 | 950 if (use == n || use->is_Root()) { |
0 | 951 return 0; |
12023 | 952 } |
0 | 953 |
12023 | 954 uint def_pre_order = get_block_for_node(def)->_pre_order; |
0 | 955 uint latency = 0; |
956 | |
957 // If the use is not a projection, then it is simple... | |
958 if (!use->is_Proj()) { | |
959 #ifndef PRODUCT | |
960 if (trace_opto_pipelining()) { | |
961 tty->print("# out(): "); | |
962 use->dump(); | |
963 } | |
964 #endif | |
965 | |
12023 | 966 uint use_pre_order = get_block_for_node(use)->_pre_order; |
0 | 967 |
968 if (use_pre_order < def_pre_order) | |
969 return 0; | |
970 | |
971 if (use_pre_order == def_pre_order && use->is_Phi()) | |
972 return 0; | |
973 | |
974 uint nlen = use->len(); | |
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975 uint nl = get_latency_for_node(use); |
0 | 976 |
977 for ( uint j=0; j<nlen; j++ ) { | |
978 if (use->in(j) == n) { | |
979 // Change this if we want local latencies | |
980 uint ul = use->latency(j); | |
981 uint l = ul + nl; | |
982 if (latency < l) latency = l; | |
983 #ifndef PRODUCT | |
984 if (trace_opto_pipelining()) { | |
985 tty->print_cr("# %d + edge_latency(%d) == %d -> %d, latency = %d", | |
986 nl, j, ul, l, latency); | |
987 } | |
988 #endif | |
989 } | |
990 } | |
991 } else { | |
992 // This is a projection, just grab the latency of the use(s) | |
993 for (DUIterator_Fast jmax, j = use->fast_outs(jmax); j < jmax; j++) { | |
994 uint l = latency_from_use(use, def, use->fast_out(j)); | |
995 if (latency < l) latency = l; | |
996 } | |
997 } | |
998 | |
999 return latency; | |
1000 } | |
1001 | |
1002 //------------------------------latency_from_uses------------------------------ | |
1003 // Compute the latency of this instruction relative to all of it's uses. | |
1004 // This computes a number that increases as we approach the beginning of the | |
1005 // routine. | |
1006 void PhaseCFG::latency_from_uses(Node *n) { | |
1007 // Set the latency for this instruction | |
1008 #ifndef PRODUCT | |
1009 if (trace_opto_pipelining()) { | |
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1010 tty->print("# latency_from_outputs: node_latency[%d] = %d for node", n->_idx, get_latency_for_node(n)); |
0 | 1011 dump(); |
1012 } | |
1013 #endif | |
1014 uint latency=0; | |
1015 const Node *def = n->is_Proj() ? n->in(0): n; | |
1016 | |
1017 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1018 uint l = latency_from_use(n, def, n->fast_out(i)); | |
1019 | |
1020 if (latency < l) latency = l; | |
1021 } | |
1022 | |
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1023 set_latency_for_node(n, latency); |
0 | 1024 } |
1025 | |
1026 //------------------------------hoist_to_cheaper_block------------------------- | |
1027 // Pick a block for node self, between early and LCA, that is a cheaper | |
1028 // alternative to LCA. | |
1029 Block* PhaseCFG::hoist_to_cheaper_block(Block* LCA, Block* early, Node* self) { | |
1030 const double delta = 1+PROB_UNLIKELY_MAG(4); | |
1031 Block* least = LCA; | |
1032 double least_freq = least->_freq; | |
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1033 uint target = get_latency_for_node(self); |
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1034 uint start_latency = get_latency_for_node(LCA->head()); |
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1035 uint end_latency = get_latency_for_node(LCA->get_node(LCA->end_idx())); |
0 | 1036 bool in_latency = (target <= start_latency); |
12023 | 1037 const Block* root_block = get_block_for_node(_root); |
0 | 1038 |
1039 // Turn off latency scheduling if scheduling is just plain off | |
1040 if (!C->do_scheduling()) | |
1041 in_latency = true; | |
1042 | |
1043 // Do not hoist (to cover latency) instructions which target a | |
1044 // single register. Hoisting stretches the live range of the | |
1045 // single register and may force spilling. | |
1046 MachNode* mach = self->is_Mach() ? self->as_Mach() : NULL; | |
1047 if (mach && mach->out_RegMask().is_bound1() && mach->out_RegMask().is_NotEmpty()) | |
1048 in_latency = true; | |
1049 | |
1050 #ifndef PRODUCT | |
1051 if (trace_opto_pipelining()) { | |
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1052 tty->print("# Find cheaper block for latency %d: ", get_latency_for_node(self)); |
0 | 1053 self->dump(); |
1054 tty->print_cr("# B%d: start latency for [%4d]=%d, end latency for [%4d]=%d, freq=%g", | |
1055 LCA->_pre_order, | |
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1056 LCA->head()->_idx, |
0 | 1057 start_latency, |
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1058 LCA->get_node(LCA->end_idx())->_idx, |
0 | 1059 end_latency, |
1060 least_freq); | |
1061 } | |
1062 #endif | |
1063 | |
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1064 int cand_cnt = 0; // number of candidates tried |
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1065 |
0 | 1066 // Walk up the dominator tree from LCA (Lowest common ancestor) to |
1067 // the earliest legal location. Capture the least execution frequency. | |
1068 while (LCA != early) { | |
1069 LCA = LCA->_idom; // Follow up the dominator tree | |
1070 | |
1071 if (LCA == NULL) { | |
1072 // Bailout without retry | |
1073 C->record_method_not_compilable("late schedule failed: LCA == NULL"); | |
1074 return least; | |
1075 } | |
1076 | |
1077 // Don't hoist machine instructions to the root basic block | |
1078 if (mach && LCA == root_block) | |
1079 break; | |
1080 | |
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1081 uint start_lat = get_latency_for_node(LCA->head()); |
0 | 1082 uint end_idx = LCA->end_idx(); |
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1083 uint end_lat = get_latency_for_node(LCA->get_node(end_idx)); |
0 | 1084 double LCA_freq = LCA->_freq; |
1085 #ifndef PRODUCT | |
1086 if (trace_opto_pipelining()) { | |
1087 tty->print_cr("# B%d: start latency for [%4d]=%d, end latency for [%4d]=%d, freq=%g", | |
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1088 LCA->_pre_order, LCA->head()->_idx, start_lat, end_idx, end_lat, LCA_freq); |
0 | 1089 } |
1090 #endif | |
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1091 cand_cnt++; |
0 | 1092 if (LCA_freq < least_freq || // Better Frequency |
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1093 (StressGCM && Compile::randomized_select(cand_cnt)) || // Should be randomly accepted in stress mode |
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1094 (!StressGCM && // Otherwise, choose with latency |
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1095 !in_latency && // No block containing latency |
0 | 1096 LCA_freq < least_freq * delta && // No worse frequency |
1097 target >= end_lat && // within latency range | |
1098 !self->is_iteratively_computed() ) // But don't hoist IV increments | |
1099 // because they may end up above other uses of their phi forcing | |
1100 // their result register to be different from their input. | |
1101 ) { | |
1102 least = LCA; // Found cheaper block | |
1103 least_freq = LCA_freq; | |
1104 start_latency = start_lat; | |
1105 end_latency = end_lat; | |
1106 if (target <= start_lat) | |
1107 in_latency = true; | |
1108 } | |
1109 } | |
1110 | |
1111 #ifndef PRODUCT | |
1112 if (trace_opto_pipelining()) { | |
1113 tty->print_cr("# Choose block B%d with start latency=%d and freq=%g", | |
1114 least->_pre_order, start_latency, least_freq); | |
1115 } | |
1116 #endif | |
1117 | |
1118 // See if the latency needs to be updated | |
1119 if (target < end_latency) { | |
1120 #ifndef PRODUCT | |
1121 if (trace_opto_pipelining()) { | |
1122 tty->print_cr("# Change latency for [%4d] from %d to %d", self->_idx, target, end_latency); | |
1123 } | |
1124 #endif | |
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1125 set_latency_for_node(self, end_latency); |
0 | 1126 partial_latency_of_defs(self); |
1127 } | |
1128 | |
1129 return least; | |
1130 } | |
1131 | |
1132 | |
1133 //------------------------------schedule_late----------------------------------- | |
1134 // Now schedule all codes as LATE as possible. This is the LCA in the | |
1135 // dominator tree of all USES of a value. Pick the block with the least | |
1136 // loop nesting depth that is lowest in the dominator tree. | |
1137 extern const char must_clone[]; | |
1138 void PhaseCFG::schedule_late(VectorSet &visited, Node_List &stack) { | |
1139 #ifndef PRODUCT | |
1140 if (trace_opto_pipelining()) | |
1141 tty->print("\n#---- schedule_late ----\n"); | |
1142 #endif | |
1143 | |
12023 | 1144 Node_Backward_Iterator iter((Node *)_root, visited, stack, *this); |
0 | 1145 Node *self; |
1146 | |
1147 // Walk over all the nodes from last to first | |
1148 while (self = iter.next()) { | |
12023 | 1149 Block* early = get_block_for_node(self); // Earliest legal placement |
0 | 1150 |
1151 if (self->is_top()) { | |
1152 // Top node goes in bb #2 with other constants. | |
1153 // It must be special-cased, because it has no out edges. | |
1154 early->add_inst(self); | |
1155 continue; | |
1156 } | |
1157 | |
1158 // No uses, just terminate | |
1159 if (self->outcnt() == 0) { | |
3842 | 1160 assert(self->is_MachProj(), "sanity"); |
0 | 1161 continue; // Must be a dead machine projection |
1162 } | |
1163 | |
1164 // If node is pinned in the block, then no scheduling can be done. | |
1165 if( self->pinned() ) // Pinned in block? | |
1166 continue; | |
1167 | |
1168 MachNode* mach = self->is_Mach() ? self->as_Mach() : NULL; | |
1169 if (mach) { | |
1170 switch (mach->ideal_Opcode()) { | |
1171 case Op_CreateEx: | |
1172 // Don't move exception creation | |
1173 early->add_inst(self); | |
1174 continue; | |
1175 break; | |
1176 case Op_CheckCastPP: | |
1177 // Don't move CheckCastPP nodes away from their input, if the input | |
1178 // is a rawptr (5071820). | |
1179 Node *def = self->in(1); | |
1180 if (def != NULL && def->bottom_type()->base() == Type::RawPtr) { | |
1181 early->add_inst(self); | |
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1182 #ifdef ASSERT |
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1183 _raw_oops.push(def); |
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1184 #endif |
0 | 1185 continue; |
1186 } | |
1187 break; | |
1188 } | |
1189 } | |
1190 | |
1191 // Gather LCA of all uses | |
1192 Block *LCA = NULL; | |
1193 { | |
1194 for (DUIterator_Fast imax, i = self->fast_outs(imax); i < imax; i++) { | |
1195 // For all uses, find LCA | |
1196 Node* use = self->fast_out(i); | |
12023 | 1197 LCA = raise_LCA_above_use(LCA, use, self, this); |
0 | 1198 } |
1199 } // (Hide defs of imax, i from rest of block.) | |
1200 | |
1201 // Place temps in the block of their use. This isn't a | |
1202 // requirement for correctness but it reduces useless | |
1203 // interference between temps and other nodes. | |
1204 if (mach != NULL && mach->is_MachTemp()) { | |
12023 | 1205 map_node_to_block(self, LCA); |
0 | 1206 LCA->add_inst(self); |
1207 continue; | |
1208 } | |
1209 | |
1210 // Check if 'self' could be anti-dependent on memory | |
1211 if (self->needs_anti_dependence_check()) { | |
1212 // Hoist LCA above possible-defs and insert anti-dependences to | |
1213 // defs in new LCA block. | |
1214 LCA = insert_anti_dependences(LCA, self); | |
1215 } | |
1216 | |
1217 if (early->_dom_depth > LCA->_dom_depth) { | |
1218 // Somehow the LCA has moved above the earliest legal point. | |
1219 // (One way this can happen is via memory_early_block.) | |
1220 if (C->subsume_loads() == true && !C->failing()) { | |
1221 // Retry with subsume_loads == false | |
1222 // If this is the first failure, the sentinel string will "stick" | |
1223 // to the Compile object, and the C2Compiler will see it and retry. | |
1224 C->record_failure(C2Compiler::retry_no_subsuming_loads()); | |
1225 } else { | |
1226 // Bailout without retry when (early->_dom_depth > LCA->_dom_depth) | |
1227 C->record_method_not_compilable("late schedule failed: incorrect graph"); | |
1228 } | |
1229 return; | |
1230 } | |
1231 | |
1232 // If there is no opportunity to hoist, then we're done. | |
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1233 // In stress mode, try to hoist even the single operations. |
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1234 bool try_to_hoist = StressGCM || (LCA != early); |
0 | 1235 |
1236 // Must clone guys stay next to use; no hoisting allowed. | |
1237 // Also cannot hoist guys that alter memory or are otherwise not | |
1238 // allocatable (hoisting can make a value live longer, leading to | |
1239 // anti and output dependency problems which are normally resolved | |
1240 // by the register allocator giving everyone a different register). | |
1241 if (mach != NULL && must_clone[mach->ideal_Opcode()]) | |
1242 try_to_hoist = false; | |
1243 | |
1244 Block* late = NULL; | |
1245 if (try_to_hoist) { | |
1246 // Now find the block with the least execution frequency. | |
1247 // Start at the latest schedule and work up to the earliest schedule | |
1248 // in the dominator tree. Thus the Node will dominate all its uses. | |
1249 late = hoist_to_cheaper_block(LCA, early, self); | |
1250 } else { | |
1251 // Just use the LCA of the uses. | |
1252 late = LCA; | |
1253 } | |
1254 | |
1255 // Put the node into target block | |
1256 schedule_node_into_block(self, late); | |
1257 | |
1258 #ifdef ASSERT | |
1259 if (self->needs_anti_dependence_check()) { | |
1260 // since precedence edges are only inserted when we're sure they | |
1261 // are needed make sure that after placement in a block we don't | |
1262 // need any new precedence edges. | |
1263 verify_anti_dependences(late, self); | |
1264 } | |
1265 #endif | |
1266 } // Loop until all nodes have been visited | |
1267 | |
1268 } // end ScheduleLate | |
1269 | |
1270 //------------------------------GlobalCodeMotion------------------------------- | |
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1271 void PhaseCFG::global_code_motion() { |
0 | 1272 ResourceMark rm; |
1273 | |
1274 #ifndef PRODUCT | |
1275 if (trace_opto_pipelining()) { | |
1276 tty->print("\n---- Start GlobalCodeMotion ----\n"); | |
1277 } | |
1278 #endif | |
1279 | |
12023 | 1280 // Initialize the node to block mapping for things on the proj_list |
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1281 for (uint i = 0; i < _matcher.number_of_projections(); i++) { |
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1282 unmap_node_from_block(_matcher.get_projection(i)); |
12023 | 1283 } |
0 | 1284 |
1285 // Set the basic block for Nodes pinned into blocks | |
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1286 Arena* arena = Thread::current()->resource_area(); |
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1287 VectorSet visited(arena); |
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1288 schedule_pinned_nodes(visited); |
0 | 1289 |
1290 // Find the earliest Block any instruction can be placed in. Some | |
1291 // instructions are pinned into Blocks. Unpinned instructions can | |
1292 // appear in last block in which all their inputs occur. | |
1293 visited.Clear(); | |
12071
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1294 Node_List stack(arena); |
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1295 // Pre-grow the list |
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1296 stack.map((C->unique() >> 1) + 16, NULL); |
0 | 1297 if (!schedule_early(visited, stack)) { |
1298 // Bailout without retry | |
1299 C->record_method_not_compilable("early schedule failed"); | |
1300 return; | |
1301 } | |
1302 | |
1303 // Build Def-Use edges. | |
1304 // Compute the latency information (via backwards walk) for all the | |
1305 // instructions in the graph | |
1685 | 1306 _node_latency = new GrowableArray<uint>(); // resource_area allocation |
0 | 1307 |
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1308 if (C->do_scheduling()) { |
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1309 compute_latencies_backwards(visited, stack); |
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1310 } |
0 | 1311 |
1312 // Now schedule all codes as LATE as possible. This is the LCA in the | |
1313 // dominator tree of all USES of a value. Pick the block with the least | |
1314 // loop nesting depth that is lowest in the dominator tree. | |
1315 // ( visited.Clear() called in schedule_late()->Node_Backward_Iterator() ) | |
1316 schedule_late(visited, stack); | |
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1317 if (C->failing()) { |
0 | 1318 // schedule_late fails only when graph is incorrect. |
1319 assert(!VerifyGraphEdges, "verification should have failed"); | |
1320 return; | |
1321 } | |
1322 | |
1323 #ifndef PRODUCT | |
1324 if (trace_opto_pipelining()) { | |
1325 tty->print("\n---- Detect implicit null checks ----\n"); | |
1326 } | |
1327 #endif | |
1328 | |
1329 // Detect implicit-null-check opportunities. Basically, find NULL checks | |
1330 // with suitable memory ops nearby. Use the memory op to do the NULL check. | |
1331 // I can generate a memory op if there is not one nearby. | |
1332 if (C->is_method_compilation()) { | |
1333 // By reversing the loop direction we get a very minor gain on mpegaudio. | |
1334 // Feel free to revert to a forward loop for clarity. | |
1335 // for( int i=0; i < (int)matcher._null_check_tests.size(); i+=2 ) { | |
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1336 for (int i = _matcher._null_check_tests.size() - 2; i >= 0; i -= 2) { |
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1337 Node* proj = _matcher._null_check_tests[i]; |
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1338 Node* val = _matcher._null_check_tests[i + 1]; |
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1339 Block* block = get_block_for_node(proj); |
14440
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1340 implicit_null_check(block, proj, val, C->allowed_deopt_reasons()); |
0 | 1341 // The implicit_null_check will only perform the transformation |
1342 // if the null branch is truly uncommon, *and* it leads to an | |
1343 // uncommon trap. Combined with the too_many_traps guards | |
1344 // above, this prevents SEGV storms reported in 6366351, | |
1345 // by recompiling offending methods without this optimization. | |
1346 } | |
1347 } | |
1348 | |
1349 #ifndef PRODUCT | |
1350 if (trace_opto_pipelining()) { | |
1351 tty->print("\n---- Start Local Scheduling ----\n"); | |
1352 } | |
1353 #endif | |
1354 | |
1355 // Schedule locally. Right now a simple topological sort. | |
1356 // Later, do a real latency aware scheduler. | |
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1357 GrowableArray<int> ready_cnt(C->unique(), C->unique(), -1); |
0 | 1358 visited.Clear(); |
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1359 for (uint i = 0; i < number_of_blocks(); i++) { |
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1360 Block* block = get_block(i); |
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1361 if (!schedule_local(block, ready_cnt, visited)) { |
0 | 1362 if (!C->failure_reason_is(C2Compiler::retry_no_subsuming_loads())) { |
1363 C->record_method_not_compilable("local schedule failed"); | |
1364 } | |
1365 return; | |
1366 } | |
1367 } | |
1368 | |
1369 // If we inserted any instructions between a Call and his CatchNode, | |
1370 // clone the instructions on all paths below the Catch. | |
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1371 for (uint i = 0; i < number_of_blocks(); i++) { |
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1372 Block* block = get_block(i); |
12171
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1373 call_catch_cleanup(block); |
12023 | 1374 } |
0 | 1375 |
1376 #ifndef PRODUCT | |
1377 if (trace_opto_pipelining()) { | |
1378 tty->print("\n---- After GlobalCodeMotion ----\n"); | |
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1379 for (uint i = 0; i < number_of_blocks(); i++) { |
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1380 Block* block = get_block(i); |
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1381 block->dump(); |
0 | 1382 } |
1383 } | |
1384 #endif | |
1685 | 1385 // Dead. |
1386 _node_latency = (GrowableArray<uint> *)0xdeadbeef; | |
0 | 1387 } |
1388 | |
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1389 bool PhaseCFG::do_global_code_motion() { |
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1390 |
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1391 build_dominator_tree(); |
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1392 if (C->failing()) { |
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1393 return false; |
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1394 } |
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1395 |
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1396 NOT_PRODUCT( C->verify_graph_edges(); ) |
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1397 |
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1398 estimate_block_frequency(); |
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1399 |
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1400 global_code_motion(); |
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1401 |
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1402 if (C->failing()) { |
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1403 return false; |
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1404 } |
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1405 |
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1406 return true; |
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1407 } |
0 | 1408 |
1409 //------------------------------Estimate_Block_Frequency----------------------- | |
1410 // Estimate block frequencies based on IfNode probabilities. | |
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1411 void PhaseCFG::estimate_block_frequency() { |
418 | 1412 |
1413 // Force conditional branches leading to uncommon traps to be unlikely, | |
1414 // not because we get to the uncommon_trap with less relative frequency, | |
1415 // but because an uncommon_trap typically causes a deopt, so we only get | |
1416 // there once. | |
1417 if (C->do_freq_based_layout()) { | |
1418 Block_List worklist; | |
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1419 Block* root_blk = get_block(0); |
418 | 1420 for (uint i = 1; i < root_blk->num_preds(); i++) { |
12023 | 1421 Block *pb = get_block_for_node(root_blk->pred(i)); |
418 | 1422 if (pb->has_uncommon_code()) { |
1423 worklist.push(pb); | |
1424 } | |
1425 } | |
1426 while (worklist.size() > 0) { | |
1427 Block* uct = worklist.pop(); | |
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1428 if (uct == get_root_block()) { |
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1429 continue; |
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|
1430 } |
418 | 1431 for (uint i = 1; i < uct->num_preds(); i++) { |
12023 | 1432 Block *pb = get_block_for_node(uct->pred(i)); |
418 | 1433 if (pb->_num_succs == 1) { |
1434 worklist.push(pb); | |
1435 } else if (pb->num_fall_throughs() == 2) { | |
1436 pb->update_uncommon_branch(uct); | |
1437 } | |
1438 } | |
1439 } | |
1440 } | |
0 | 1441 |
1442 // Create the loop tree and calculate loop depth. | |
1443 _root_loop = create_loop_tree(); | |
1444 _root_loop->compute_loop_depth(0); | |
1445 | |
1446 // Compute block frequency of each block, relative to a single loop entry. | |
1447 _root_loop->compute_freq(); | |
1448 | |
1449 // Adjust all frequencies to be relative to a single method entry | |
418 | 1450 _root_loop->_freq = 1.0; |
0 | 1451 _root_loop->scale_freq(); |
1452 | |
673 | 1453 // Save outmost loop frequency for LRG frequency threshold |
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1454 _outer_loop_frequency = _root_loop->outer_loop_freq(); |
673 | 1455 |
0 | 1456 // force paths ending at uncommon traps to be infrequent |
418 | 1457 if (!C->do_freq_based_layout()) { |
1458 Block_List worklist; | |
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1459 Block* root_blk = get_block(0); |
418 | 1460 for (uint i = 1; i < root_blk->num_preds(); i++) { |
12023 | 1461 Block *pb = get_block_for_node(root_blk->pred(i)); |
418 | 1462 if (pb->has_uncommon_code()) { |
1463 worklist.push(pb); | |
1464 } | |
0 | 1465 } |
418 | 1466 while (worklist.size() > 0) { |
1467 Block* uct = worklist.pop(); | |
1468 uct->_freq = PROB_MIN; | |
1469 for (uint i = 1; i < uct->num_preds(); i++) { | |
12023 | 1470 Block *pb = get_block_for_node(uct->pred(i)); |
418 | 1471 if (pb->_num_succs == 1 && pb->_freq > PROB_MIN) { |
1472 worklist.push(pb); | |
1473 } | |
0 | 1474 } |
1475 } | |
1476 } | |
1477 | |
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1478 #ifdef ASSERT |
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1479 for (uint i = 0; i < number_of_blocks(); i++) { |
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1480 Block* b = get_block(i); |
605 | 1481 assert(b->_freq >= MIN_BLOCK_FREQUENCY, "Register Allocator requires meaningful block frequency"); |
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1482 } |
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1483 #endif |
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1484 |
0 | 1485 #ifndef PRODUCT |
1486 if (PrintCFGBlockFreq) { | |
1487 tty->print_cr("CFG Block Frequencies"); | |
1488 _root_loop->dump_tree(); | |
1489 if (Verbose) { | |
1490 tty->print_cr("PhaseCFG dump"); | |
1491 dump(); | |
1492 tty->print_cr("Node dump"); | |
1493 _root->dump(99999); | |
1494 } | |
1495 } | |
1496 #endif | |
1497 } | |
1498 | |
1499 //----------------------------create_loop_tree-------------------------------- | |
1500 // Create a loop tree from the CFG | |
1501 CFGLoop* PhaseCFG::create_loop_tree() { | |
1502 | |
1503 #ifdef ASSERT | |
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1504 assert(get_block(0) == get_root_block(), "first block should be root block"); |
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1505 for (uint i = 0; i < number_of_blocks(); i++) { |
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1506 Block* block = get_block(i); |
0 | 1507 // Check that _loop field are clear...we could clear them if not. |
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1508 assert(block->_loop == NULL, "clear _loop expected"); |
0 | 1509 // Sanity check that the RPO numbering is reflected in the _blocks array. |
1510 // It doesn't have to be for the loop tree to be built, but if it is not, | |
1511 // then the blocks have been reordered since dom graph building...which | |
1512 // may question the RPO numbering | |
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1513 assert(block->_rpo == i, "unexpected reverse post order number"); |
0 | 1514 } |
1515 #endif | |
1516 | |
1517 int idct = 0; | |
1518 CFGLoop* root_loop = new CFGLoop(idct++); | |
1519 | |
1520 Block_List worklist; | |
1521 | |
1522 // Assign blocks to loops | |
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1523 for(uint i = number_of_blocks() - 1; i > 0; i-- ) { // skip Root block |
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1524 Block* block = get_block(i); |
0 | 1525 |
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1526 if (block->head()->is_Loop()) { |
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1527 Block* loop_head = block; |
0 | 1528 assert(loop_head->num_preds() - 1 == 2, "loop must have 2 predecessors"); |
1529 Node* tail_n = loop_head->pred(LoopNode::LoopBackControl); | |
12023 | 1530 Block* tail = get_block_for_node(tail_n); |
0 | 1531 |
1532 // Defensively filter out Loop nodes for non-single-entry loops. | |
1533 // For all reasonable loops, the head occurs before the tail in RPO. | |
1534 if (i <= tail->_rpo) { | |
1535 | |
1536 // The tail and (recursive) predecessors of the tail | |
1537 // are made members of a new loop. | |
1538 | |
1539 assert(worklist.size() == 0, "nonempty worklist"); | |
1540 CFGLoop* nloop = new CFGLoop(idct++); | |
1541 assert(loop_head->_loop == NULL, "just checking"); | |
1542 loop_head->_loop = nloop; | |
1543 // Add to nloop so push_pred() will skip over inner loops | |
1544 nloop->add_member(loop_head); | |
12023 | 1545 nloop->push_pred(loop_head, LoopNode::LoopBackControl, worklist, this); |
0 | 1546 |
1547 while (worklist.size() > 0) { | |
1548 Block* member = worklist.pop(); | |
1549 if (member != loop_head) { | |
1550 for (uint j = 1; j < member->num_preds(); j++) { | |
12023 | 1551 nloop->push_pred(member, j, worklist, this); |
0 | 1552 } |
1553 } | |
1554 } | |
1555 } | |
1556 } | |
1557 } | |
1558 | |
1559 // Create a member list for each loop consisting | |
1560 // of both blocks and (immediate child) loops. | |
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1561 for (uint i = 0; i < number_of_blocks(); i++) { |
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1562 Block* block = get_block(i); |
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1563 CFGLoop* lp = block->_loop; |
0 | 1564 if (lp == NULL) { |
1565 // Not assigned to a loop. Add it to the method's pseudo loop. | |
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1566 block->_loop = root_loop; |
0 | 1567 lp = root_loop; |
1568 } | |
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1569 if (lp == root_loop || block != lp->head()) { // loop heads are already members |
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1570 lp->add_member(block); |
0 | 1571 } |
1572 if (lp != root_loop) { | |
1573 if (lp->parent() == NULL) { | |
1574 // Not a nested loop. Make it a child of the method's pseudo loop. | |
1575 root_loop->add_nested_loop(lp); | |
1576 } | |
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1577 if (block == lp->head()) { |
0 | 1578 // Add nested loop to member list of parent loop. |
1579 lp->parent()->add_member(lp); | |
1580 } | |
1581 } | |
1582 } | |
1583 | |
1584 return root_loop; | |
1585 } | |
1586 | |
1587 //------------------------------push_pred-------------------------------------- | |
12023 | 1588 void CFGLoop::push_pred(Block* blk, int i, Block_List& worklist, PhaseCFG* cfg) { |
0 | 1589 Node* pred_n = blk->pred(i); |
12023 | 1590 Block* pred = cfg->get_block_for_node(pred_n); |
0 | 1591 CFGLoop *pred_loop = pred->_loop; |
1592 if (pred_loop == NULL) { | |
1593 // Filter out blocks for non-single-entry loops. | |
1594 // For all reasonable loops, the head occurs before the tail in RPO. | |
1595 if (pred->_rpo > head()->_rpo) { | |
1596 pred->_loop = this; | |
1597 worklist.push(pred); | |
1598 } | |
1599 } else if (pred_loop != this) { | |
1600 // Nested loop. | |
1601 while (pred_loop->_parent != NULL && pred_loop->_parent != this) { | |
1602 pred_loop = pred_loop->_parent; | |
1603 } | |
1604 // Make pred's loop be a child | |
1605 if (pred_loop->_parent == NULL) { | |
1606 add_nested_loop(pred_loop); | |
1607 // Continue with loop entry predecessor. | |
1608 Block* pred_head = pred_loop->head(); | |
1609 assert(pred_head->num_preds() - 1 == 2, "loop must have 2 predecessors"); | |
1610 assert(pred_head != head(), "loop head in only one loop"); | |
12023 | 1611 push_pred(pred_head, LoopNode::EntryControl, worklist, cfg); |
0 | 1612 } else { |
1613 assert(pred_loop->_parent == this && _parent == NULL, "just checking"); | |
1614 } | |
1615 } | |
1616 } | |
1617 | |
1618 //------------------------------add_nested_loop-------------------------------- | |
1619 // Make cl a child of the current loop in the loop tree. | |
1620 void CFGLoop::add_nested_loop(CFGLoop* cl) { | |
1621 assert(_parent == NULL, "no parent yet"); | |
1622 assert(cl != this, "not my own parent"); | |
1623 cl->_parent = this; | |
1624 CFGLoop* ch = _child; | |
1625 if (ch == NULL) { | |
1626 _child = cl; | |
1627 } else { | |
1628 while (ch->_sibling != NULL) { ch = ch->_sibling; } | |
1629 ch->_sibling = cl; | |
1630 } | |
1631 } | |
1632 | |
1633 //------------------------------compute_loop_depth----------------------------- | |
1634 // Store the loop depth in each CFGLoop object. | |
1635 // Recursively walk the children to do the same for them. | |
1636 void CFGLoop::compute_loop_depth(int depth) { | |
1637 _depth = depth; | |
1638 CFGLoop* ch = _child; | |
1639 while (ch != NULL) { | |
1640 ch->compute_loop_depth(depth + 1); | |
1641 ch = ch->_sibling; | |
1642 } | |
1643 } | |
1644 | |
1645 //------------------------------compute_freq----------------------------------- | |
1646 // Compute the frequency of each block and loop, relative to a single entry | |
1647 // into the dominating loop head. | |
1648 void CFGLoop::compute_freq() { | |
1649 // Bottom up traversal of loop tree (visit inner loops first.) | |
1650 // Set loop head frequency to 1.0, then transitively | |
1651 // compute frequency for all successors in the loop, | |
1652 // as well as for each exit edge. Inner loops are | |
1653 // treated as single blocks with loop exit targets | |
1654 // as the successor blocks. | |
1655 | |
1656 // Nested loops first | |
1657 CFGLoop* ch = _child; | |
1658 while (ch != NULL) { | |
1659 ch->compute_freq(); | |
1660 ch = ch->_sibling; | |
1661 } | |
1662 assert (_members.length() > 0, "no empty loops"); | |
1663 Block* hd = head(); | |
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1664 hd->_freq = 1.0; |
0 | 1665 for (int i = 0; i < _members.length(); i++) { |
1666 CFGElement* s = _members.at(i); | |
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1667 double freq = s->_freq; |
0 | 1668 if (s->is_block()) { |
1669 Block* b = s->as_Block(); | |
1670 for (uint j = 0; j < b->_num_succs; j++) { | |
1671 Block* sb = b->_succs[j]; | |
1672 update_succ_freq(sb, freq * b->succ_prob(j)); | |
1673 } | |
1674 } else { | |
1675 CFGLoop* lp = s->as_CFGLoop(); | |
1676 assert(lp->_parent == this, "immediate child"); | |
1677 for (int k = 0; k < lp->_exits.length(); k++) { | |
1678 Block* eb = lp->_exits.at(k).get_target(); | |
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1679 double prob = lp->_exits.at(k).get_prob(); |
0 | 1680 update_succ_freq(eb, freq * prob); |
1681 } | |
1682 } | |
1683 } | |
1684 | |
1685 // For all loops other than the outer, "method" loop, | |
1686 // sum and normalize the exit probability. The "method" loop | |
1687 // should keep the initial exit probability of 1, so that | |
1688 // inner blocks do not get erroneously scaled. | |
1689 if (_depth != 0) { | |
1690 // Total the exit probabilities for this loop. | |
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1691 double exits_sum = 0.0f; |
0 | 1692 for (int i = 0; i < _exits.length(); i++) { |
1693 exits_sum += _exits.at(i).get_prob(); | |
1694 } | |
1695 | |
1696 // Normalize the exit probabilities. Until now, the | |
1697 // probabilities estimate the possibility of exit per | |
1698 // a single loop iteration; afterward, they estimate | |
1699 // the probability of exit per loop entry. | |
1700 for (int i = 0; i < _exits.length(); i++) { | |
1701 Block* et = _exits.at(i).get_target(); | |
418 | 1702 float new_prob = 0.0f; |
1703 if (_exits.at(i).get_prob() > 0.0f) { | |
1704 new_prob = _exits.at(i).get_prob() / exits_sum; | |
1705 } | |
0 | 1706 BlockProbPair bpp(et, new_prob); |
1707 _exits.at_put(i, bpp); | |
1708 } | |
1709 | |
418 | 1710 // Save the total, but guard against unreasonable probability, |
0 | 1711 // as the value is used to estimate the loop trip count. |
1712 // An infinite trip count would blur relative block | |
1713 // frequencies. | |
1714 if (exits_sum > 1.0f) exits_sum = 1.0; | |
1715 if (exits_sum < PROB_MIN) exits_sum = PROB_MIN; | |
1716 _exit_prob = exits_sum; | |
1717 } | |
1718 } | |
1719 | |
1720 //------------------------------succ_prob------------------------------------- | |
1721 // Determine the probability of reaching successor 'i' from the receiver block. | |
1722 float Block::succ_prob(uint i) { | |
1723 int eidx = end_idx(); | |
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1724 Node *n = get_node(eidx); // Get ending Node |
308 | 1725 |
1726 int op = n->Opcode(); | |
1727 if (n->is_Mach()) { | |
1728 if (n->is_MachNullCheck()) { | |
1729 // Can only reach here if called after lcm. The original Op_If is gone, | |
1730 // so we attempt to infer the probability from one or both of the | |
1731 // successor blocks. | |
1732 assert(_num_succs == 2, "expecting 2 successors of a null check"); | |
1733 // If either successor has only one predecessor, then the | |
605 | 1734 // probability estimate can be derived using the |
308 | 1735 // relative frequency of the successor and this block. |
1736 if (_succs[i]->num_preds() == 2) { | |
1737 return _succs[i]->_freq / _freq; | |
1738 } else if (_succs[1-i]->num_preds() == 2) { | |
1739 return 1 - (_succs[1-i]->_freq / _freq); | |
1740 } else { | |
1741 // Estimate using both successor frequencies | |
1742 float freq = _succs[i]->_freq; | |
1743 return freq / (freq + _succs[1-i]->_freq); | |
1744 } | |
1745 } | |
1746 op = n->as_Mach()->ideal_Opcode(); | |
1747 } | |
1748 | |
0 | 1749 |
1750 // Switch on branch type | |
1751 switch( op ) { | |
1752 case Op_CountedLoopEnd: | |
1753 case Op_If: { | |
1754 assert (i < 2, "just checking"); | |
1755 // Conditionals pass on only part of their frequency | |
1756 float prob = n->as_MachIf()->_prob; | |
1757 assert(prob >= 0.0 && prob <= 1.0, "out of range probability"); | |
1758 // If succ[i] is the FALSE branch, invert path info | |
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1759 if( get_node(i + eidx + 1)->Opcode() == Op_IfFalse ) { |
0 | 1760 return 1.0f - prob; // not taken |
1761 } else { | |
1762 return prob; // taken | |
1763 } | |
1764 } | |
1765 | |
1766 case Op_Jump: | |
1767 // Divide the frequency between all successors evenly | |
1768 return 1.0f/_num_succs; | |
1769 | |
1770 case Op_Catch: { | |
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1771 const CatchProjNode *ci = get_node(i + eidx + 1)->as_CatchProj(); |
0 | 1772 if (ci->_con == CatchProjNode::fall_through_index) { |
1773 // Fall-thru path gets the lion's share. | |
1774 return 1.0f - PROB_UNLIKELY_MAG(5)*_num_succs; | |
1775 } else { | |
1776 // Presume exceptional paths are equally unlikely | |
1777 return PROB_UNLIKELY_MAG(5); | |
1778 } | |
1779 } | |
1780 | |
1781 case Op_Root: | |
1782 case Op_Goto: | |
1783 // Pass frequency straight thru to target | |
1784 return 1.0f; | |
1785 | |
1786 case Op_NeverBranch: | |
1787 return 0.0f; | |
1788 | |
1789 case Op_TailCall: | |
1790 case Op_TailJump: | |
1791 case Op_Return: | |
1792 case Op_Halt: | |
1793 case Op_Rethrow: | |
1794 // Do not push out freq to root block | |
1795 return 0.0f; | |
1796 | |
1797 default: | |
1798 ShouldNotReachHere(); | |
1799 } | |
1800 | |
1801 return 0.0f; | |
1802 } | |
1803 | |
418 | 1804 //------------------------------num_fall_throughs----------------------------- |
1805 // Return the number of fall-through candidates for a block | |
1806 int Block::num_fall_throughs() { | |
1807 int eidx = end_idx(); | |
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1808 Node *n = get_node(eidx); // Get ending Node |
418 | 1809 |
1810 int op = n->Opcode(); | |
1811 if (n->is_Mach()) { | |
1812 if (n->is_MachNullCheck()) { | |
1813 // In theory, either side can fall-thru, for simplicity sake, | |
1814 // let's say only the false branch can now. | |
1815 return 1; | |
1816 } | |
1817 op = n->as_Mach()->ideal_Opcode(); | |
1818 } | |
1819 | |
1820 // Switch on branch type | |
1821 switch( op ) { | |
1822 case Op_CountedLoopEnd: | |
1823 case Op_If: | |
1824 return 2; | |
1825 | |
1826 case Op_Root: | |
1827 case Op_Goto: | |
1828 return 1; | |
1829 | |
1830 case Op_Catch: { | |
1831 for (uint i = 0; i < _num_succs; i++) { | |
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1832 const CatchProjNode *ci = get_node(i + eidx + 1)->as_CatchProj(); |
418 | 1833 if (ci->_con == CatchProjNode::fall_through_index) { |
1834 return 1; | |
1835 } | |
1836 } | |
1837 return 0; | |
1838 } | |
1839 | |
1840 case Op_Jump: | |
1841 case Op_NeverBranch: | |
1842 case Op_TailCall: | |
1843 case Op_TailJump: | |
1844 case Op_Return: | |
1845 case Op_Halt: | |
1846 case Op_Rethrow: | |
1847 return 0; | |
1848 | |
1849 default: | |
1850 ShouldNotReachHere(); | |
1851 } | |
1852 | |
1853 return 0; | |
1854 } | |
1855 | |
1856 //------------------------------succ_fall_through----------------------------- | |
1857 // Return true if a specific successor could be fall-through target. | |
1858 bool Block::succ_fall_through(uint i) { | |
1859 int eidx = end_idx(); | |
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1860 Node *n = get_node(eidx); // Get ending Node |
418 | 1861 |
1862 int op = n->Opcode(); | |
1863 if (n->is_Mach()) { | |
1864 if (n->is_MachNullCheck()) { | |
1865 // In theory, either side can fall-thru, for simplicity sake, | |
1866 // let's say only the false branch can now. | |
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1867 return get_node(i + eidx + 1)->Opcode() == Op_IfFalse; |
418 | 1868 } |
1869 op = n->as_Mach()->ideal_Opcode(); | |
1870 } | |
1871 | |
1872 // Switch on branch type | |
1873 switch( op ) { | |
1874 case Op_CountedLoopEnd: | |
1875 case Op_If: | |
1876 case Op_Root: | |
1877 case Op_Goto: | |
1878 return true; | |
1879 | |
1880 case Op_Catch: { | |
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1881 const CatchProjNode *ci = get_node(i + eidx + 1)->as_CatchProj(); |
418 | 1882 return ci->_con == CatchProjNode::fall_through_index; |
1883 } | |
1884 | |
1885 case Op_Jump: | |
1886 case Op_NeverBranch: | |
1887 case Op_TailCall: | |
1888 case Op_TailJump: | |
1889 case Op_Return: | |
1890 case Op_Halt: | |
1891 case Op_Rethrow: | |
1892 return false; | |
1893 | |
1894 default: | |
1895 ShouldNotReachHere(); | |
1896 } | |
1897 | |
1898 return false; | |
1899 } | |
1900 | |
1901 //------------------------------update_uncommon_branch------------------------ | |
1902 // Update the probability of a two-branch to be uncommon | |
1903 void Block::update_uncommon_branch(Block* ub) { | |
1904 int eidx = end_idx(); | |
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1905 Node *n = get_node(eidx); // Get ending Node |
418 | 1906 |
1907 int op = n->as_Mach()->ideal_Opcode(); | |
1908 | |
1909 assert(op == Op_CountedLoopEnd || op == Op_If, "must be a If"); | |
1910 assert(num_fall_throughs() == 2, "must be a two way branch block"); | |
1911 | |
1912 // Which successor is ub? | |
1913 uint s; | |
1914 for (s = 0; s <_num_succs; s++) { | |
1915 if (_succs[s] == ub) break; | |
1916 } | |
1917 assert(s < 2, "uncommon successor must be found"); | |
1918 | |
1919 // If ub is the true path, make the proability small, else | |
1920 // ub is the false path, and make the probability large | |
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1921 bool invert = (get_node(s + eidx + 1)->Opcode() == Op_IfFalse); |
418 | 1922 |
1923 // Get existing probability | |
1924 float p = n->as_MachIf()->_prob; | |
1925 | |
1926 if (invert) p = 1.0 - p; | |
1927 if (p > PROB_MIN) { | |
1928 p = PROB_MIN; | |
1929 } | |
1930 if (invert) p = 1.0 - p; | |
1931 | |
1932 n->as_MachIf()->_prob = p; | |
1933 } | |
1934 | |
0 | 1935 //------------------------------update_succ_freq------------------------------- |
605 | 1936 // Update the appropriate frequency associated with block 'b', a successor of |
0 | 1937 // a block in this loop. |
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1938 void CFGLoop::update_succ_freq(Block* b, double freq) { |
0 | 1939 if (b->_loop == this) { |
1940 if (b == head()) { | |
1941 // back branch within the loop | |
1942 // Do nothing now, the loop carried frequency will be | |
1943 // adjust later in scale_freq(). | |
1944 } else { | |
1945 // simple branch within the loop | |
1946 b->_freq += freq; | |
1947 } | |
1948 } else if (!in_loop_nest(b)) { | |
1949 // branch is exit from this loop | |
1950 BlockProbPair bpp(b, freq); | |
1951 _exits.append(bpp); | |
1952 } else { | |
1953 // branch into nested loop | |
1954 CFGLoop* ch = b->_loop; | |
1955 ch->_freq += freq; | |
1956 } | |
1957 } | |
1958 | |
1959 //------------------------------in_loop_nest----------------------------------- | |
1960 // Determine if block b is in the receiver's loop nest. | |
1961 bool CFGLoop::in_loop_nest(Block* b) { | |
1962 int depth = _depth; | |
1963 CFGLoop* b_loop = b->_loop; | |
1964 int b_depth = b_loop->_depth; | |
1965 if (depth == b_depth) { | |
1966 return true; | |
1967 } | |
1968 while (b_depth > depth) { | |
1969 b_loop = b_loop->_parent; | |
1970 b_depth = b_loop->_depth; | |
1971 } | |
1972 return b_loop == this; | |
1973 } | |
1974 | |
1975 //------------------------------scale_freq------------------------------------- | |
1976 // Scale frequency of loops and blocks by trip counts from outer loops | |
1977 // Do a top down traversal of loop tree (visit outer loops first.) | |
1978 void CFGLoop::scale_freq() { | |
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1979 double loop_freq = _freq * trip_count(); |
673 | 1980 _freq = loop_freq; |
0 | 1981 for (int i = 0; i < _members.length(); i++) { |
1982 CFGElement* s = _members.at(i); | |
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1983 double block_freq = s->_freq * loop_freq; |
621 | 1984 if (g_isnan(block_freq) || block_freq < MIN_BLOCK_FREQUENCY) |
1985 block_freq = MIN_BLOCK_FREQUENCY; | |
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1986 s->_freq = block_freq; |
0 | 1987 } |
1988 CFGLoop* ch = _child; | |
1989 while (ch != NULL) { | |
1990 ch->scale_freq(); | |
1991 ch = ch->_sibling; | |
1992 } | |
1993 } | |
1994 | |
673 | 1995 // Frequency of outer loop |
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1996 double CFGLoop::outer_loop_freq() const { |
673 | 1997 if (_child != NULL) { |
1998 return _child->_freq; | |
1999 } | |
2000 return _freq; | |
2001 } | |
2002 | |
0 | 2003 #ifndef PRODUCT |
2004 //------------------------------dump_tree-------------------------------------- | |
2005 void CFGLoop::dump_tree() const { | |
2006 dump(); | |
2007 if (_child != NULL) _child->dump_tree(); | |
2008 if (_sibling != NULL) _sibling->dump_tree(); | |
2009 } | |
2010 | |
2011 //------------------------------dump------------------------------------------- | |
2012 void CFGLoop::dump() const { | |
2013 for (int i = 0; i < _depth; i++) tty->print(" "); | |
2014 tty->print("%s: %d trip_count: %6.0f freq: %6.0f\n", | |
2015 _depth == 0 ? "Method" : "Loop", _id, trip_count(), _freq); | |
2016 for (int i = 0; i < _depth; i++) tty->print(" "); | |
2017 tty->print(" members:", _id); | |
2018 int k = 0; | |
2019 for (int i = 0; i < _members.length(); i++) { | |
2020 if (k++ >= 6) { | |
2021 tty->print("\n "); | |
2022 for (int j = 0; j < _depth+1; j++) tty->print(" "); | |
2023 k = 0; | |
2024 } | |
2025 CFGElement *s = _members.at(i); | |
2026 if (s->is_block()) { | |
2027 Block *b = s->as_Block(); | |
2028 tty->print(" B%d(%6.3f)", b->_pre_order, b->_freq); | |
2029 } else { | |
2030 CFGLoop* lp = s->as_CFGLoop(); | |
2031 tty->print(" L%d(%6.3f)", lp->_id, lp->_freq); | |
2032 } | |
2033 } | |
2034 tty->print("\n"); | |
2035 for (int i = 0; i < _depth; i++) tty->print(" "); | |
2036 tty->print(" exits: "); | |
2037 k = 0; | |
2038 for (int i = 0; i < _exits.length(); i++) { | |
2039 if (k++ >= 7) { | |
2040 tty->print("\n "); | |
2041 for (int j = 0; j < _depth+1; j++) tty->print(" "); | |
2042 k = 0; | |
2043 } | |
2044 Block *blk = _exits.at(i).get_target(); | |
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2045 double prob = _exits.at(i).get_prob(); |
0 | 2046 tty->print(" ->%d@%d%%", blk->_pre_order, (int)(prob*100)); |
2047 } | |
2048 tty->print("\n"); | |
2049 } | |
2050 #endif |