Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/superword.cpp @ 23014:84d55f179e24
8079343: Crash in PhaseIdealLoop with "assert(!had_error) failed: bad dominance"
Summary: C2 should not try to vectorize loops with loop variant vector base address.
Reviewed-by: kvn
author | thartmann |
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date | Mon, 11 May 2015 07:44:46 +0200 |
parents | a1b5fe34c604 |
children | 95dbbc0431d9 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2007, 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 | |
1972 | 24 #include "precompiled.hpp" |
25 #include "compiler/compileLog.hpp" | |
26 #include "libadt/vectset.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/addnode.hpp" | |
29 #include "opto/callnode.hpp" | |
30 #include "opto/divnode.hpp" | |
31 #include "opto/matcher.hpp" | |
32 #include "opto/memnode.hpp" | |
33 #include "opto/mulnode.hpp" | |
34 #include "opto/opcodes.hpp" | |
35 #include "opto/superword.hpp" | |
36 #include "opto/vectornode.hpp" | |
0 | 37 |
38 // | |
39 // S U P E R W O R D T R A N S F O R M | |
40 //============================================================================= | |
41 | |
42 //------------------------------SuperWord--------------------------- | |
43 SuperWord::SuperWord(PhaseIdealLoop* phase) : | |
44 _phase(phase), | |
45 _igvn(phase->_igvn), | |
46 _arena(phase->C->comp_arena()), | |
47 _packset(arena(), 8, 0, NULL), // packs for the current block | |
48 _bb_idx(arena(), (int)(1.10 * phase->C->unique()), 0, 0), // node idx to index in bb | |
49 _block(arena(), 8, 0, NULL), // nodes in current block | |
50 _data_entry(arena(), 8, 0, NULL), // nodes with all inputs from outside | |
51 _mem_slice_head(arena(), 8, 0, NULL), // memory slice heads | |
52 _mem_slice_tail(arena(), 8, 0, NULL), // memory slice tails | |
53 _node_info(arena(), 8, 0, SWNodeInfo::initial), // info needed per node | |
54 _align_to_ref(NULL), // memory reference to align vectors to | |
55 _disjoint_ptrs(arena(), 8, 0, OrderedPair::initial), // runtime disambiguated pointer pairs | |
56 _dg(_arena), // dependence graph | |
57 _visited(arena()), // visited node set | |
58 _post_visited(arena()), // post visited node set | |
59 _n_idx_list(arena(), 8), // scratch list of (node,index) pairs | |
60 _stk(arena(), 8, 0, NULL), // scratch stack of nodes | |
61 _nlist(arena(), 8, 0, NULL), // scratch list of nodes | |
62 _lpt(NULL), // loop tree node | |
63 _lp(NULL), // LoopNode | |
64 _bb(NULL), // basic block | |
65 _iv(NULL) // induction var | |
66 {} | |
67 | |
68 //------------------------------transform_loop--------------------------- | |
69 void SuperWord::transform_loop(IdealLoopTree* lpt) { | |
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70 assert(UseSuperWord, "should be"); |
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71 // Do vectors exist on this architecture? |
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72 if (Matcher::vector_width_in_bytes(T_BYTE) < 2) return; |
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73 |
0 | 74 assert(lpt->_head->is_CountedLoop(), "must be"); |
75 CountedLoopNode *cl = lpt->_head->as_CountedLoop(); | |
76 | |
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77 if (!cl->is_valid_counted_loop()) return; // skip malformed counted loop |
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78 |
0 | 79 if (!cl->is_main_loop() ) return; // skip normal, pre, and post loops |
80 | |
81 // Check for no control flow in body (other than exit) | |
82 Node *cl_exit = cl->loopexit(); | |
83 if (cl_exit->in(0) != lpt->_head) return; | |
84 | |
105
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85 // Make sure the are no extra control users of the loop backedge |
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86 if (cl->back_control()->outcnt() != 1) { |
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87 return; |
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88 } |
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89 |
0 | 90 // Check for pre-loop ending with CountedLoopEnd(Bool(Cmp(x,Opaque1(limit)))) |
91 CountedLoopEndNode* pre_end = get_pre_loop_end(cl); | |
92 if (pre_end == NULL) return; | |
93 Node *pre_opaq1 = pre_end->limit(); | |
94 if (pre_opaq1->Opcode() != Op_Opaque1) return; | |
95 | |
96 init(); // initialize data structures | |
97 | |
98 set_lpt(lpt); | |
99 set_lp(cl); | |
100 | |
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101 // For now, define one block which is the entire loop body |
0 | 102 set_bb(cl); |
103 | |
104 assert(_packset.length() == 0, "packset must be empty"); | |
105 SLP_extract(); | |
106 } | |
107 | |
108 //------------------------------SLP_extract--------------------------- | |
109 // Extract the superword level parallelism | |
110 // | |
111 // 1) A reverse post-order of nodes in the block is constructed. By scanning | |
112 // this list from first to last, all definitions are visited before their uses. | |
113 // | |
114 // 2) A point-to-point dependence graph is constructed between memory references. | |
115 // This simplies the upcoming "independence" checker. | |
116 // | |
117 // 3) The maximum depth in the node graph from the beginning of the block | |
118 // to each node is computed. This is used to prune the graph search | |
119 // in the independence checker. | |
120 // | |
121 // 4) For integer types, the necessary bit width is propagated backwards | |
122 // from stores to allow packed operations on byte, char, and short | |
123 // integers. This reverses the promotion to type "int" that javac | |
124 // did for operations like: char c1,c2,c3; c1 = c2 + c3. | |
125 // | |
126 // 5) One of the memory references is picked to be an aligned vector reference. | |
127 // The pre-loop trip count is adjusted to align this reference in the | |
128 // unrolled body. | |
129 // | |
130 // 6) The initial set of pack pairs is seeded with memory references. | |
131 // | |
132 // 7) The set of pack pairs is extended by following use->def and def->use links. | |
133 // | |
134 // 8) The pairs are combined into vector sized packs. | |
135 // | |
136 // 9) Reorder the memory slices to co-locate members of the memory packs. | |
137 // | |
138 // 10) Generate ideal vector nodes for the final set of packs and where necessary, | |
139 // inserting scalar promotion, vector creation from multiple scalars, and | |
140 // extraction of scalar values from vectors. | |
141 // | |
142 void SuperWord::SLP_extract() { | |
143 | |
144 // Ready the block | |
145 | |
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146 if (!construct_bb()) |
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147 return; // Exit if no interesting nodes or complex graph. |
0 | 148 |
149 dependence_graph(); | |
150 | |
151 compute_max_depth(); | |
152 | |
153 compute_vector_element_type(); | |
154 | |
155 // Attempt vectorization | |
156 | |
157 find_adjacent_refs(); | |
158 | |
159 extend_packlist(); | |
160 | |
161 combine_packs(); | |
162 | |
163 construct_my_pack_map(); | |
164 | |
165 filter_packs(); | |
166 | |
167 schedule(); | |
168 | |
169 output(); | |
170 } | |
171 | |
172 //------------------------------find_adjacent_refs--------------------------- | |
173 // Find the adjacent memory references and create pack pairs for them. | |
174 // This is the initial set of packs that will then be extended by | |
175 // following use->def and def->use links. The align positions are | |
176 // assigned relative to the reference "align_to_ref" | |
177 void SuperWord::find_adjacent_refs() { | |
178 // Get list of memory operations | |
179 Node_List memops; | |
180 for (int i = 0; i < _block.length(); i++) { | |
181 Node* n = _block.at(i); | |
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182 if (n->is_Mem() && !n->is_LoadStore() && in_bb(n) && |
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183 is_java_primitive(n->as_Mem()->memory_type())) { |
0 | 184 int align = memory_alignment(n->as_Mem(), 0); |
185 if (align != bottom_align) { | |
186 memops.push(n); | |
187 } | |
188 } | |
189 } | |
190 | |
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191 Node_List align_to_refs; |
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192 int best_iv_adjustment = 0; |
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193 MemNode* best_align_to_mem_ref = NULL; |
0 | 194 |
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195 while (memops.size() != 0) { |
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196 // Find a memory reference to align to. |
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197 MemNode* mem_ref = find_align_to_ref(memops); |
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198 if (mem_ref == NULL) break; |
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199 align_to_refs.push(mem_ref); |
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200 int iv_adjustment = get_iv_adjustment(mem_ref); |
0 | 201 |
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202 if (best_align_to_mem_ref == NULL) { |
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203 // Set memory reference which is the best from all memory operations |
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204 // to be used for alignment. The pre-loop trip count is modified to align |
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205 // this reference to a vector-aligned address. |
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206 best_align_to_mem_ref = mem_ref; |
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207 best_iv_adjustment = iv_adjustment; |
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208 } |
0 | 209 |
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210 SWPointer align_to_ref_p(mem_ref, this); |
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211 // Set alignment relative to "align_to_ref" for all related memory operations. |
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212 for (int i = memops.size() - 1; i >= 0; i--) { |
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213 MemNode* s = memops.at(i)->as_Mem(); |
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214 if (isomorphic(s, mem_ref)) { |
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215 SWPointer p2(s, this); |
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216 if (p2.comparable(align_to_ref_p)) { |
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217 int align = memory_alignment(s, iv_adjustment); |
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218 set_alignment(s, align); |
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219 } |
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220 } |
0 | 221 } |
222 | |
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223 // Create initial pack pairs of memory operations for which |
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224 // alignment is set and vectors will be aligned. |
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225 bool create_pack = true; |
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226 if (memory_alignment(mem_ref, best_iv_adjustment) == 0) { |
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227 if (!Matcher::misaligned_vectors_ok()) { |
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228 int vw = vector_width(mem_ref); |
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229 int vw_best = vector_width(best_align_to_mem_ref); |
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230 if (vw > vw_best) { |
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231 // Do not vectorize a memory access with more elements per vector |
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232 // if unaligned memory access is not allowed because number of |
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233 // iterations in pre-loop will be not enough to align it. |
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234 create_pack = false; |
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235 } |
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236 } |
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237 } else { |
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238 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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239 // Can't allow vectorization of unaligned memory accesses with the |
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240 // same type since it could be overlapped accesses to the same array. |
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241 create_pack = false; |
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242 } else { |
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243 // Allow independent (different type) unaligned memory operations |
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244 // if HW supports them. |
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245 if (!Matcher::misaligned_vectors_ok()) { |
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246 create_pack = false; |
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247 } else { |
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248 // Check if packs of the same memory type but |
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249 // with a different alignment were created before. |
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250 for (uint i = 0; i < align_to_refs.size(); i++) { |
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251 MemNode* mr = align_to_refs.at(i)->as_Mem(); |
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252 if (same_velt_type(mr, mem_ref) && |
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253 memory_alignment(mr, iv_adjustment) != 0) |
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254 create_pack = false; |
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255 } |
0 | 256 } |
257 } | |
258 } | |
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259 if (create_pack) { |
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260 for (uint i = 0; i < memops.size(); i++) { |
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261 Node* s1 = memops.at(i); |
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262 int align = alignment(s1); |
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263 if (align == top_align) continue; |
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264 for (uint j = 0; j < memops.size(); j++) { |
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265 Node* s2 = memops.at(j); |
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266 if (alignment(s2) == top_align) continue; |
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267 if (s1 != s2 && are_adjacent_refs(s1, s2)) { |
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268 if (stmts_can_pack(s1, s2, align)) { |
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269 Node_List* pair = new Node_List(); |
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270 pair->push(s1); |
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271 pair->push(s2); |
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272 _packset.append(pair); |
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273 } |
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274 } |
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275 } |
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276 } |
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277 } else { // Don't create unaligned pack |
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278 // First, remove remaining memory ops of the same type from the list. |
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279 for (int i = memops.size() - 1; i >= 0; i--) { |
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280 MemNode* s = memops.at(i)->as_Mem(); |
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281 if (same_velt_type(s, mem_ref)) { |
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282 memops.remove(i); |
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283 } |
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284 } |
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285 |
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286 // Second, remove already constructed packs of the same type. |
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287 for (int i = _packset.length() - 1; i >= 0; i--) { |
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288 Node_List* p = _packset.at(i); |
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289 MemNode* s = p->at(0)->as_Mem(); |
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290 if (same_velt_type(s, mem_ref)) { |
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291 remove_pack_at(i); |
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292 } |
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293 } |
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294 |
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295 // If needed find the best memory reference for loop alignment again. |
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296 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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297 // Put memory ops from remaining packs back on memops list for |
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298 // the best alignment search. |
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299 uint orig_msize = memops.size(); |
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300 for (int i = 0; i < _packset.length(); i++) { |
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301 Node_List* p = _packset.at(i); |
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302 MemNode* s = p->at(0)->as_Mem(); |
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303 assert(!same_velt_type(s, mem_ref), "sanity"); |
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304 memops.push(s); |
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305 } |
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306 MemNode* best_align_to_mem_ref = find_align_to_ref(memops); |
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307 if (best_align_to_mem_ref == NULL) break; |
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308 best_iv_adjustment = get_iv_adjustment(best_align_to_mem_ref); |
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309 // Restore list. |
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310 while (memops.size() > orig_msize) |
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311 (void)memops.pop(); |
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312 } |
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313 } // unaligned memory accesses |
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314 |
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315 // Remove used mem nodes. |
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316 for (int i = memops.size() - 1; i >= 0; i--) { |
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317 MemNode* m = memops.at(i)->as_Mem(); |
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318 if (alignment(m) != top_align) { |
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319 memops.remove(i); |
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320 } |
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321 } |
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322 |
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323 } // while (memops.size() != 0 |
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324 set_align_to_ref(best_align_to_mem_ref); |
0 | 325 |
326 #ifndef PRODUCT | |
327 if (TraceSuperWord) { | |
328 tty->print_cr("\nAfter find_adjacent_refs"); | |
329 print_packset(); | |
330 } | |
331 #endif | |
332 } | |
333 | |
334 //------------------------------find_align_to_ref--------------------------- | |
335 // Find a memory reference to align the loop induction variable to. | |
336 // Looks first at stores then at loads, looking for a memory reference | |
337 // with the largest number of references similar to it. | |
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338 MemNode* SuperWord::find_align_to_ref(Node_List &memops) { |
0 | 339 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); |
340 | |
341 // Count number of comparable memory ops | |
342 for (uint i = 0; i < memops.size(); i++) { | |
343 MemNode* s1 = memops.at(i)->as_Mem(); | |
344 SWPointer p1(s1, this); | |
345 // Discard if pre loop can't align this reference | |
346 if (!ref_is_alignable(p1)) { | |
347 *cmp_ct.adr_at(i) = 0; | |
348 continue; | |
349 } | |
350 for (uint j = i+1; j < memops.size(); j++) { | |
351 MemNode* s2 = memops.at(j)->as_Mem(); | |
352 if (isomorphic(s1, s2)) { | |
353 SWPointer p2(s2, this); | |
354 if (p1.comparable(p2)) { | |
355 (*cmp_ct.adr_at(i))++; | |
356 (*cmp_ct.adr_at(j))++; | |
357 } | |
358 } | |
359 } | |
360 } | |
361 | |
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362 // Find Store (or Load) with the greatest number of "comparable" references, |
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363 // biggest vector size, smallest data size and smallest iv offset. |
0 | 364 int max_ct = 0; |
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365 int max_vw = 0; |
0 | 366 int max_idx = -1; |
367 int min_size = max_jint; | |
368 int min_iv_offset = max_jint; | |
369 for (uint j = 0; j < memops.size(); j++) { | |
370 MemNode* s = memops.at(j)->as_Mem(); | |
371 if (s->is_Store()) { | |
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372 int vw = vector_width_in_bytes(s); |
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373 assert(vw > 1, "sanity"); |
0 | 374 SWPointer p(s, this); |
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375 if (cmp_ct.at(j) > max_ct || |
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376 cmp_ct.at(j) == max_ct && |
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377 (vw > max_vw || |
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378 vw == max_vw && |
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379 (data_size(s) < min_size || |
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380 data_size(s) == min_size && |
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381 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 382 max_ct = cmp_ct.at(j); |
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383 max_vw = vw; |
0 | 384 max_idx = j; |
385 min_size = data_size(s); | |
386 min_iv_offset = p.offset_in_bytes(); | |
387 } | |
388 } | |
389 } | |
390 // If no stores, look at loads | |
391 if (max_ct == 0) { | |
392 for (uint j = 0; j < memops.size(); j++) { | |
393 MemNode* s = memops.at(j)->as_Mem(); | |
394 if (s->is_Load()) { | |
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395 int vw = vector_width_in_bytes(s); |
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396 assert(vw > 1, "sanity"); |
0 | 397 SWPointer p(s, this); |
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398 if (cmp_ct.at(j) > max_ct || |
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399 cmp_ct.at(j) == max_ct && |
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400 (vw > max_vw || |
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401 vw == max_vw && |
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402 (data_size(s) < min_size || |
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403 data_size(s) == min_size && |
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404 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 405 max_ct = cmp_ct.at(j); |
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406 max_vw = vw; |
0 | 407 max_idx = j; |
408 min_size = data_size(s); | |
409 min_iv_offset = p.offset_in_bytes(); | |
410 } | |
411 } | |
412 } | |
413 } | |
414 | |
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415 #ifdef ASSERT |
0 | 416 if (TraceSuperWord && Verbose) { |
417 tty->print_cr("\nVector memops after find_align_to_refs"); | |
418 for (uint i = 0; i < memops.size(); i++) { | |
419 MemNode* s = memops.at(i)->as_Mem(); | |
420 s->dump(); | |
421 } | |
422 } | |
423 #endif | |
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424 |
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425 if (max_ct > 0) { |
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426 #ifdef ASSERT |
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427 if (TraceSuperWord) { |
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428 tty->print("\nVector align to node: "); |
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429 memops.at(max_idx)->as_Mem()->dump(); |
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430 } |
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431 #endif |
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432 return memops.at(max_idx)->as_Mem(); |
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433 } |
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434 return NULL; |
0 | 435 } |
436 | |
437 //------------------------------ref_is_alignable--------------------------- | |
438 // Can the preloop align the reference to position zero in the vector? | |
439 bool SuperWord::ref_is_alignable(SWPointer& p) { | |
440 if (!p.has_iv()) { | |
441 return true; // no induction variable | |
442 } | |
443 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); | |
444 assert(pre_end->stride_is_con(), "pre loop stride is constant"); | |
445 int preloop_stride = pre_end->stride_con(); | |
446 | |
447 int span = preloop_stride * p.scale_in_bytes(); | |
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448 int mem_size = p.memory_size(); |
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449 int offset = p.offset_in_bytes(); |
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450 // Stride one accesses are alignable if offset is aligned to memory operation size. |
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451 // Offset can be unaligned when UseUnalignedAccesses is used. |
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452 if (ABS(span) == mem_size && (ABS(offset) % mem_size) == 0) { |
0 | 453 return true; |
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454 } |
0 | 455 // If initial offset from start of object is computable, |
456 // compute alignment within the vector. | |
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457 int vw = vector_width_in_bytes(p.mem()); |
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458 assert(vw > 1, "sanity"); |
0 | 459 if (vw % span == 0) { |
460 Node* init_nd = pre_end->init_trip(); | |
461 if (init_nd->is_Con() && p.invar() == NULL) { | |
462 int init = init_nd->bottom_type()->is_int()->get_con(); | |
463 | |
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464 int init_offset = init * p.scale_in_bytes() + offset; |
0 | 465 assert(init_offset >= 0, "positive offset from object start"); |
466 | |
467 if (span > 0) { | |
468 return (vw - (init_offset % vw)) % span == 0; | |
469 } else { | |
470 assert(span < 0, "nonzero stride * scale"); | |
471 return (init_offset % vw) % -span == 0; | |
472 } | |
473 } | |
474 } | |
475 return false; | |
476 } | |
477 | |
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478 //---------------------------get_iv_adjustment--------------------------- |
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479 // Calculate loop's iv adjustment for this memory ops. |
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480 int SuperWord::get_iv_adjustment(MemNode* mem_ref) { |
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481 SWPointer align_to_ref_p(mem_ref, this); |
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482 int offset = align_to_ref_p.offset_in_bytes(); |
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483 int scale = align_to_ref_p.scale_in_bytes(); |
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484 int vw = vector_width_in_bytes(mem_ref); |
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485 assert(vw > 1, "sanity"); |
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486 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; |
6794 | 487 // At least one iteration is executed in pre-loop by default. As result |
488 // several iterations are needed to align memory operations in main-loop even | |
489 // if offset is 0. | |
490 int iv_adjustment_in_bytes = (stride_sign * vw - (offset % vw)); | |
491 int elt_size = align_to_ref_p.memory_size(); | |
492 assert(((ABS(iv_adjustment_in_bytes) % elt_size) == 0), | |
493 err_msg_res("(%d) should be divisible by (%d)", iv_adjustment_in_bytes, elt_size)); | |
494 int iv_adjustment = iv_adjustment_in_bytes/elt_size; | |
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495 |
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496 #ifndef PRODUCT |
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497 if (TraceSuperWord) |
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498 tty->print_cr("\noffset = %d iv_adjust = %d elt_size = %d scale = %d iv_stride = %d vect_size %d", |
6794 | 499 offset, iv_adjustment, elt_size, scale, iv_stride(), vw); |
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500 #endif |
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501 return iv_adjustment; |
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502 } |
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503 |
0 | 504 //---------------------------dependence_graph--------------------------- |
505 // Construct dependency graph. | |
506 // Add dependence edges to load/store nodes for memory dependence | |
507 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) | |
508 void SuperWord::dependence_graph() { | |
509 // First, assign a dependence node to each memory node | |
510 for (int i = 0; i < _block.length(); i++ ) { | |
511 Node *n = _block.at(i); | |
512 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { | |
513 _dg.make_node(n); | |
514 } | |
515 } | |
516 | |
517 // For each memory slice, create the dependences | |
518 for (int i = 0; i < _mem_slice_head.length(); i++) { | |
519 Node* n = _mem_slice_head.at(i); | |
520 Node* n_tail = _mem_slice_tail.at(i); | |
521 | |
522 // Get slice in predecessor order (last is first) | |
523 mem_slice_preds(n_tail, n, _nlist); | |
524 | |
525 // Make the slice dependent on the root | |
526 DepMem* slice = _dg.dep(n); | |
527 _dg.make_edge(_dg.root(), slice); | |
528 | |
529 // Create a sink for the slice | |
530 DepMem* slice_sink = _dg.make_node(NULL); | |
531 _dg.make_edge(slice_sink, _dg.tail()); | |
532 | |
533 // Now visit each pair of memory ops, creating the edges | |
534 for (int j = _nlist.length() - 1; j >= 0 ; j--) { | |
535 Node* s1 = _nlist.at(j); | |
536 | |
537 // If no dependency yet, use slice | |
538 if (_dg.dep(s1)->in_cnt() == 0) { | |
539 _dg.make_edge(slice, s1); | |
540 } | |
541 SWPointer p1(s1->as_Mem(), this); | |
542 bool sink_dependent = true; | |
543 for (int k = j - 1; k >= 0; k--) { | |
544 Node* s2 = _nlist.at(k); | |
545 if (s1->is_Load() && s2->is_Load()) | |
546 continue; | |
547 SWPointer p2(s2->as_Mem(), this); | |
548 | |
549 int cmp = p1.cmp(p2); | |
550 if (SuperWordRTDepCheck && | |
551 p1.base() != p2.base() && p1.valid() && p2.valid()) { | |
552 // Create a runtime check to disambiguate | |
553 OrderedPair pp(p1.base(), p2.base()); | |
554 _disjoint_ptrs.append_if_missing(pp); | |
555 } else if (!SWPointer::not_equal(cmp)) { | |
556 // Possibly same address | |
557 _dg.make_edge(s1, s2); | |
558 sink_dependent = false; | |
559 } | |
560 } | |
561 if (sink_dependent) { | |
562 _dg.make_edge(s1, slice_sink); | |
563 } | |
564 } | |
565 #ifndef PRODUCT | |
566 if (TraceSuperWord) { | |
567 tty->print_cr("\nDependence graph for slice: %d", n->_idx); | |
568 for (int q = 0; q < _nlist.length(); q++) { | |
569 _dg.print(_nlist.at(q)); | |
570 } | |
571 tty->cr(); | |
572 } | |
573 #endif | |
574 _nlist.clear(); | |
575 } | |
576 | |
577 #ifndef PRODUCT | |
578 if (TraceSuperWord) { | |
579 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); | |
580 for (int r = 0; r < _disjoint_ptrs.length(); r++) { | |
581 _disjoint_ptrs.at(r).print(); | |
582 tty->cr(); | |
583 } | |
584 tty->cr(); | |
585 } | |
586 #endif | |
587 } | |
588 | |
589 //---------------------------mem_slice_preds--------------------------- | |
590 // Return a memory slice (node list) in predecessor order starting at "start" | |
591 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { | |
592 assert(preds.length() == 0, "start empty"); | |
593 Node* n = start; | |
594 Node* prev = NULL; | |
595 while (true) { | |
596 assert(in_bb(n), "must be in block"); | |
597 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
598 Node* out = n->fast_out(i); | |
599 if (out->is_Load()) { | |
600 if (in_bb(out)) { | |
601 preds.push(out); | |
602 } | |
603 } else { | |
604 // FIXME | |
605 if (out->is_MergeMem() && !in_bb(out)) { | |
606 // Either unrolling is causing a memory edge not to disappear, | |
607 // or need to run igvn.optimize() again before SLP | |
608 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { | |
609 // Ditto. Not sure what else to check further. | |
667 | 610 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { |
0 | 611 // StoreCM has an input edge used as a precedence edge. |
612 // Maybe an issue when oop stores are vectorized. | |
613 } else { | |
614 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
615 } | |
616 } | |
617 } | |
618 if (n == stop) break; | |
619 preds.push(n); | |
620 prev = n; | |
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621 assert(n->is_Mem(), err_msg_res("unexpected node %s", n->Name())); |
0 | 622 n = n->in(MemNode::Memory); |
623 } | |
624 } | |
625 | |
626 //------------------------------stmts_can_pack--------------------------- | |
605 | 627 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and |
0 | 628 // s1 aligned at "align" |
629 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
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630 |
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631 // Do not use superword for non-primitives |
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632 BasicType bt1 = velt_basic_type(s1); |
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633 BasicType bt2 = velt_basic_type(s2); |
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634 if(!is_java_primitive(bt1) || !is_java_primitive(bt2)) |
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635 return false; |
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636 if (Matcher::max_vector_size(bt1) < 2) { |
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637 return false; // No vectors for this type |
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638 } |
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639 |
0 | 640 if (isomorphic(s1, s2)) { |
641 if (independent(s1, s2)) { | |
642 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
643 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
644 int s1_align = alignment(s1); | |
645 int s2_align = alignment(s2); | |
646 if (s1_align == top_align || s1_align == align) { | |
647 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
648 return true; | |
649 } | |
650 } | |
651 } | |
652 } | |
653 } | |
654 } | |
655 return false; | |
656 } | |
657 | |
658 //------------------------------exists_at--------------------------- | |
659 // Does s exist in a pack at position pos? | |
660 bool SuperWord::exists_at(Node* s, uint pos) { | |
661 for (int i = 0; i < _packset.length(); i++) { | |
662 Node_List* p = _packset.at(i); | |
663 if (p->at(pos) == s) { | |
664 return true; | |
665 } | |
666 } | |
667 return false; | |
668 } | |
669 | |
670 //------------------------------are_adjacent_refs--------------------------- | |
671 // Is s1 immediately before s2 in memory? | |
672 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
673 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
674 if (!in_bb(s1) || !in_bb(s2)) return false; | |
1585 | 675 |
676 // Do not use superword for non-primitives | |
677 if (!is_java_primitive(s1->as_Mem()->memory_type()) || | |
678 !is_java_primitive(s2->as_Mem()->memory_type())) { | |
679 return false; | |
680 } | |
681 | |
0 | 682 // FIXME - co_locate_pack fails on Stores in different mem-slices, so |
683 // only pack memops that are in the same alias set until that's fixed. | |
684 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
685 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
686 return false; | |
687 SWPointer p1(s1->as_Mem(), this); | |
688 SWPointer p2(s2->as_Mem(), this); | |
689 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
690 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
691 return diff == data_size(s1); | |
692 } | |
693 | |
694 //------------------------------isomorphic--------------------------- | |
695 // Are s1 and s2 similar? | |
696 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
697 if (s1->Opcode() != s2->Opcode()) return false; | |
698 if (s1->req() != s2->req()) return false; | |
699 if (s1->in(0) != s2->in(0)) return false; | |
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700 if (!same_velt_type(s1, s2)) return false; |
0 | 701 return true; |
702 } | |
703 | |
704 //------------------------------independent--------------------------- | |
705 // Is there no data path from s1 to s2 or s2 to s1? | |
706 bool SuperWord::independent(Node* s1, Node* s2) { | |
707 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
708 int d1 = depth(s1); | |
709 int d2 = depth(s2); | |
710 if (d1 == d2) return s1 != s2; | |
711 Node* deep = d1 > d2 ? s1 : s2; | |
712 Node* shallow = d1 > d2 ? s2 : s1; | |
713 | |
714 visited_clear(); | |
715 | |
716 return independent_path(shallow, deep); | |
717 } | |
718 | |
719 //------------------------------independent_path------------------------------ | |
720 // Helper for independent | |
721 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
722 if (dp >= 1000) return false; // stop deep recursion | |
723 visited_set(deep); | |
724 int shal_depth = depth(shallow); | |
725 assert(shal_depth <= depth(deep), "must be"); | |
726 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
727 Node* pred = preds.current(); | |
728 if (in_bb(pred) && !visited_test(pred)) { | |
729 if (shallow == pred) { | |
730 return false; | |
731 } | |
732 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
733 return false; | |
734 } | |
735 } | |
736 } | |
737 return true; | |
738 } | |
739 | |
740 //------------------------------set_alignment--------------------------- | |
741 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
742 set_alignment(s1, align); | |
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743 if (align == top_align || align == bottom_align) { |
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744 set_alignment(s2, align); |
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745 } else { |
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746 set_alignment(s2, align + data_size(s1)); |
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747 } |
0 | 748 } |
749 | |
750 //------------------------------data_size--------------------------- | |
751 int SuperWord::data_size(Node* s) { | |
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752 int bsize = type2aelembytes(velt_basic_type(s)); |
0 | 753 assert(bsize != 0, "valid size"); |
754 return bsize; | |
755 } | |
756 | |
757 //------------------------------extend_packlist--------------------------- | |
758 // Extend packset by following use->def and def->use links from pack members. | |
759 void SuperWord::extend_packlist() { | |
760 bool changed; | |
761 do { | |
762 changed = false; | |
763 for (int i = 0; i < _packset.length(); i++) { | |
764 Node_List* p = _packset.at(i); | |
765 changed |= follow_use_defs(p); | |
766 changed |= follow_def_uses(p); | |
767 } | |
768 } while (changed); | |
769 | |
770 #ifndef PRODUCT | |
771 if (TraceSuperWord) { | |
772 tty->print_cr("\nAfter extend_packlist"); | |
773 print_packset(); | |
774 } | |
775 #endif | |
776 } | |
777 | |
778 //------------------------------follow_use_defs--------------------------- | |
779 // Extend the packset by visiting operand definitions of nodes in pack p | |
780 bool SuperWord::follow_use_defs(Node_List* p) { | |
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781 assert(p->size() == 2, "just checking"); |
0 | 782 Node* s1 = p->at(0); |
783 Node* s2 = p->at(1); | |
784 assert(s1->req() == s2->req(), "just checking"); | |
785 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
786 | |
787 if (s1->is_Load()) return false; | |
788 | |
789 int align = alignment(s1); | |
790 bool changed = false; | |
791 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
792 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
793 for (int j = start; j < end; j++) { | |
794 Node* t1 = s1->in(j); | |
795 Node* t2 = s2->in(j); | |
796 if (!in_bb(t1) || !in_bb(t2)) | |
797 continue; | |
798 if (stmts_can_pack(t1, t2, align)) { | |
799 if (est_savings(t1, t2) >= 0) { | |
800 Node_List* pair = new Node_List(); | |
801 pair->push(t1); | |
802 pair->push(t2); | |
803 _packset.append(pair); | |
804 set_alignment(t1, t2, align); | |
805 changed = true; | |
806 } | |
807 } | |
808 } | |
809 return changed; | |
810 } | |
811 | |
812 //------------------------------follow_def_uses--------------------------- | |
813 // Extend the packset by visiting uses of nodes in pack p | |
814 bool SuperWord::follow_def_uses(Node_List* p) { | |
815 bool changed = false; | |
816 Node* s1 = p->at(0); | |
817 Node* s2 = p->at(1); | |
818 assert(p->size() == 2, "just checking"); | |
819 assert(s1->req() == s2->req(), "just checking"); | |
820 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
821 | |
822 if (s1->is_Store()) return false; | |
823 | |
824 int align = alignment(s1); | |
825 int savings = -1; | |
826 Node* u1 = NULL; | |
827 Node* u2 = NULL; | |
828 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
829 Node* t1 = s1->fast_out(i); | |
830 if (!in_bb(t1)) continue; | |
831 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
832 Node* t2 = s2->fast_out(j); | |
833 if (!in_bb(t2)) continue; | |
834 if (!opnd_positions_match(s1, t1, s2, t2)) | |
835 continue; | |
836 if (stmts_can_pack(t1, t2, align)) { | |
837 int my_savings = est_savings(t1, t2); | |
838 if (my_savings > savings) { | |
839 savings = my_savings; | |
840 u1 = t1; | |
841 u2 = t2; | |
842 } | |
843 } | |
844 } | |
845 } | |
846 if (savings >= 0) { | |
847 Node_List* pair = new Node_List(); | |
848 pair->push(u1); | |
849 pair->push(u2); | |
850 _packset.append(pair); | |
851 set_alignment(u1, u2, align); | |
852 changed = true; | |
853 } | |
854 return changed; | |
855 } | |
856 | |
857 //---------------------------opnd_positions_match------------------------- | |
858 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
859 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
860 uint ct = u1->req(); | |
861 if (ct != u2->req()) return false; | |
862 uint i1 = 0; | |
863 uint i2 = 0; | |
864 do { | |
865 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
866 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
867 if (i1 != i2) { | |
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868 if ((i1 == (3-i2)) && (u2->is_Add() || u2->is_Mul())) { |
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869 // Further analysis relies on operands position matching. |
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870 u2->swap_edges(i1, i2); |
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871 } else { |
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872 return false; |
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873 } |
0 | 874 } |
875 } while (i1 < ct); | |
876 return true; | |
877 } | |
878 | |
879 //------------------------------est_savings--------------------------- | |
880 // Estimate the savings from executing s1 and s2 as a pack | |
881 int SuperWord::est_savings(Node* s1, Node* s2) { | |
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882 int save_in = 2 - 1; // 2 operations per instruction in packed form |
0 | 883 |
884 // inputs | |
885 for (uint i = 1; i < s1->req(); i++) { | |
886 Node* x1 = s1->in(i); | |
887 Node* x2 = s2->in(i); | |
888 if (x1 != x2) { | |
889 if (are_adjacent_refs(x1, x2)) { | |
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890 save_in += adjacent_profit(x1, x2); |
0 | 891 } else if (!in_packset(x1, x2)) { |
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892 save_in -= pack_cost(2); |
0 | 893 } else { |
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894 save_in += unpack_cost(2); |
0 | 895 } |
896 } | |
897 } | |
898 | |
899 // uses of result | |
900 uint ct = 0; | |
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901 int save_use = 0; |
0 | 902 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { |
903 Node* s1_use = s1->fast_out(i); | |
904 for (int j = 0; j < _packset.length(); j++) { | |
905 Node_List* p = _packset.at(j); | |
906 if (p->at(0) == s1_use) { | |
907 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
908 Node* s2_use = s2->fast_out(k); | |
909 if (p->at(p->size()-1) == s2_use) { | |
910 ct++; | |
911 if (are_adjacent_refs(s1_use, s2_use)) { | |
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912 save_use += adjacent_profit(s1_use, s2_use); |
0 | 913 } |
914 } | |
915 } | |
916 } | |
917 } | |
918 } | |
919 | |
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920 if (ct < s1->outcnt()) save_use += unpack_cost(1); |
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921 if (ct < s2->outcnt()) save_use += unpack_cost(1); |
0 | 922 |
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923 return MAX2(save_in, save_use); |
0 | 924 } |
925 | |
926 //------------------------------costs--------------------------- | |
927 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
928 int SuperWord::pack_cost(int ct) { return ct; } | |
929 int SuperWord::unpack_cost(int ct) { return ct; } | |
930 | |
931 //------------------------------combine_packs--------------------------- | |
932 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
933 void SuperWord::combine_packs() { | |
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934 bool changed = true; |
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935 // Combine packs regardless max vector size. |
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936 while (changed) { |
0 | 937 changed = false; |
938 for (int i = 0; i < _packset.length(); i++) { | |
939 Node_List* p1 = _packset.at(i); | |
940 if (p1 == NULL) continue; | |
941 for (int j = 0; j < _packset.length(); j++) { | |
942 Node_List* p2 = _packset.at(j); | |
943 if (p2 == NULL) continue; | |
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944 if (i == j) continue; |
0 | 945 if (p1->at(p1->size()-1) == p2->at(0)) { |
946 for (uint k = 1; k < p2->size(); k++) { | |
947 p1->push(p2->at(k)); | |
948 } | |
949 _packset.at_put(j, NULL); | |
950 changed = true; | |
951 } | |
952 } | |
953 } | |
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954 } |
0 | 955 |
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956 // Split packs which have size greater then max vector size. |
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957 for (int i = 0; i < _packset.length(); i++) { |
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958 Node_List* p1 = _packset.at(i); |
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959 if (p1 != NULL) { |
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960 BasicType bt = velt_basic_type(p1->at(0)); |
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961 uint max_vlen = Matcher::max_vector_size(bt); // Max elements in vector |
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962 assert(is_power_of_2(max_vlen), "sanity"); |
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963 uint psize = p1->size(); |
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964 if (!is_power_of_2(psize)) { |
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965 // Skip pack which can't be vector. |
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966 // case1: for(...) { a[i] = i; } elements values are different (i+x) |
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967 // case2: for(...) { a[i] = b[i+1]; } can't align both, load and store |
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968 _packset.at_put(i, NULL); |
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969 continue; |
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970 } |
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971 if (psize > max_vlen) { |
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972 Node_List* pack = new Node_List(); |
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973 for (uint j = 0; j < psize; j++) { |
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974 pack->push(p1->at(j)); |
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975 if (pack->size() >= max_vlen) { |
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976 assert(is_power_of_2(pack->size()), "sanity"); |
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977 _packset.append(pack); |
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978 pack = new Node_List(); |
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979 } |
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980 } |
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981 _packset.at_put(i, NULL); |
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982 } |
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983 } |
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984 } |
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985 |
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986 // Compress list. |
0 | 987 for (int i = _packset.length() - 1; i >= 0; i--) { |
988 Node_List* p1 = _packset.at(i); | |
989 if (p1 == NULL) { | |
990 _packset.remove_at(i); | |
991 } | |
992 } | |
993 | |
994 #ifndef PRODUCT | |
995 if (TraceSuperWord) { | |
996 tty->print_cr("\nAfter combine_packs"); | |
997 print_packset(); | |
998 } | |
999 #endif | |
1000 } | |
1001 | |
1002 //-----------------------------construct_my_pack_map-------------------------- | |
1003 // Construct the map from nodes to packs. Only valid after the | |
1004 // point where a node is only in one pack (after combine_packs). | |
1005 void SuperWord::construct_my_pack_map() { | |
1006 Node_List* rslt = NULL; | |
1007 for (int i = 0; i < _packset.length(); i++) { | |
1008 Node_List* p = _packset.at(i); | |
1009 for (uint j = 0; j < p->size(); j++) { | |
1010 Node* s = p->at(j); | |
1011 assert(my_pack(s) == NULL, "only in one pack"); | |
1012 set_my_pack(s, p); | |
1013 } | |
1014 } | |
1015 } | |
1016 | |
1017 //------------------------------filter_packs--------------------------- | |
1018 // Remove packs that are not implemented or not profitable. | |
1019 void SuperWord::filter_packs() { | |
1020 | |
1021 // Remove packs that are not implemented | |
1022 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1023 Node_List* pk = _packset.at(i); | |
1024 bool impl = implemented(pk); | |
1025 if (!impl) { | |
1026 #ifndef PRODUCT | |
1027 if (TraceSuperWord && Verbose) { | |
1028 tty->print_cr("Unimplemented"); | |
1029 pk->at(0)->dump(); | |
1030 } | |
1031 #endif | |
1032 remove_pack_at(i); | |
1033 } | |
1034 } | |
1035 | |
1036 // Remove packs that are not profitable | |
1037 bool changed; | |
1038 do { | |
1039 changed = false; | |
1040 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1041 Node_List* pk = _packset.at(i); | |
1042 bool prof = profitable(pk); | |
1043 if (!prof) { | |
1044 #ifndef PRODUCT | |
1045 if (TraceSuperWord && Verbose) { | |
1046 tty->print_cr("Unprofitable"); | |
1047 pk->at(0)->dump(); | |
1048 } | |
1049 #endif | |
1050 remove_pack_at(i); | |
1051 changed = true; | |
1052 } | |
1053 } | |
1054 } while (changed); | |
1055 | |
1056 #ifndef PRODUCT | |
1057 if (TraceSuperWord) { | |
1058 tty->print_cr("\nAfter filter_packs"); | |
1059 print_packset(); | |
1060 tty->cr(); | |
1061 } | |
1062 #endif | |
1063 } | |
1064 | |
1065 //------------------------------implemented--------------------------- | |
1066 // Can code be generated for pack p? | |
1067 bool SuperWord::implemented(Node_List* p) { | |
1068 Node* p0 = p->at(0); | |
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1069 return VectorNode::implemented(p0->Opcode(), p->size(), velt_basic_type(p0)); |
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1070 } |
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1071 |
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1072 //------------------------------same_inputs-------------------------- |
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1073 // For pack p, are all idx operands the same? |
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1074 static bool same_inputs(Node_List* p, int idx) { |
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1075 Node* p0 = p->at(0); |
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1076 uint vlen = p->size(); |
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1077 Node* p0_def = p0->in(idx); |
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1078 for (uint i = 1; i < vlen; i++) { |
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1079 Node* pi = p->at(i); |
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1080 Node* pi_def = pi->in(idx); |
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1081 if (p0_def != pi_def) |
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1082 return false; |
6617 | 1083 } |
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1084 return true; |
0 | 1085 } |
1086 | |
1087 //------------------------------profitable--------------------------- | |
1088 // For pack p, are all operands and all uses (with in the block) vector? | |
1089 bool SuperWord::profitable(Node_List* p) { | |
1090 Node* p0 = p->at(0); | |
1091 uint start, end; | |
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1092 VectorNode::vector_operands(p0, &start, &end); |
0 | 1093 |
6803 | 1094 // Return false if some inputs are not vectors or vectors with different |
1095 // size or alignment. | |
1096 // Also, for now, return false if not scalar promotion case when inputs are | |
1097 // the same. Later, implement PackNode and allow differing, non-vector inputs | |
1098 // (maybe just the ones from outside the block.) | |
0 | 1099 for (uint i = start; i < end; i++) { |
6803 | 1100 if (!is_vector_use(p0, i)) |
1101 return false; | |
0 | 1102 } |
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1103 if (VectorNode::is_shift(p0)) { |
6803 | 1104 // For now, return false if shift count is vector or not scalar promotion |
1105 // case (different shift counts) because it is not supported yet. | |
1106 Node* cnt = p0->in(2); | |
1107 Node_List* cnt_pk = my_pack(cnt); | |
1108 if (cnt_pk != NULL) | |
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1109 return false; |
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1110 if (!same_inputs(p, 2)) |
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1111 return false; |
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1112 } |
0 | 1113 if (!p0->is_Store()) { |
1114 // For now, return false if not all uses are vector. | |
1115 // Later, implement ExtractNode and allow non-vector uses (maybe | |
1116 // just the ones outside the block.) | |
1117 for (uint i = 0; i < p->size(); i++) { | |
1118 Node* def = p->at(i); | |
1119 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1120 Node* use = def->fast_out(j); | |
1121 for (uint k = 0; k < use->req(); k++) { | |
1122 Node* n = use->in(k); | |
1123 if (def == n) { | |
1124 if (!is_vector_use(use, k)) { | |
1125 return false; | |
1126 } | |
1127 } | |
1128 } | |
1129 } | |
1130 } | |
1131 } | |
1132 return true; | |
1133 } | |
1134 | |
1135 //------------------------------schedule--------------------------- | |
1136 // Adjust the memory graph for the packed operations | |
1137 void SuperWord::schedule() { | |
1138 | |
1139 // Co-locate in the memory graph the members of each memory pack | |
1140 for (int i = 0; i < _packset.length(); i++) { | |
1141 co_locate_pack(_packset.at(i)); | |
1142 } | |
1143 } | |
1144 | |
667 | 1145 //-------------------------------remove_and_insert------------------- |
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1146 // Remove "current" from its current position in the memory graph and insert |
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1147 // it after the appropriate insertion point (lip or uip). |
667 | 1148 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, |
1149 Node *uip, Unique_Node_List &sched_before) { | |
1150 Node* my_mem = current->in(MemNode::Memory); | |
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1151 bool sched_up = sched_before.member(current); |
667 | 1152 |
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1153 // remove current_store from its current position in the memmory graph |
667 | 1154 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1155 Node* use = current->out(i); | |
1156 if (use->is_Mem()) { | |
1157 assert(use->in(MemNode::Memory) == current, "must be"); | |
1158 if (use == prev) { // connect prev to my_mem | |
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1159 _igvn.replace_input_of(use, MemNode::Memory, my_mem); |
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1160 --i; //deleted this edge; rescan position |
667 | 1161 } else if (sched_before.member(use)) { |
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1162 if (!sched_up) { // Will be moved together with current |
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1163 _igvn.replace_input_of(use, MemNode::Memory, uip); |
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1164 --i; //deleted this edge; rescan position |
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1165 } |
667 | 1166 } else { |
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1167 if (sched_up) { // Will be moved together with current |
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1168 _igvn.replace_input_of(use, MemNode::Memory, lip); |
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1169 --i; //deleted this edge; rescan position |
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1170 } |
667 | 1171 } |
1172 } | |
1173 } | |
1174 | |
1175 Node *insert_pt = sched_up ? uip : lip; | |
1176 | |
1177 // all uses of insert_pt's memory state should use current's instead | |
1178 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { | |
1179 Node* use = insert_pt->out(i); | |
1180 if (use->is_Mem()) { | |
1181 assert(use->in(MemNode::Memory) == insert_pt, "must be"); | |
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1182 _igvn.replace_input_of(use, MemNode::Memory, current); |
667 | 1183 --i; //deleted this edge; rescan position |
1184 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { | |
1185 uint pos; //lip (lower insert point) must be the last one in the memory slice | |
1186 for (pos=1; pos < use->req(); pos++) { | |
1187 if (use->in(pos) == insert_pt) break; | |
1188 } | |
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1189 _igvn.replace_input_of(use, pos, current); |
667 | 1190 --i; |
1191 } | |
1192 } | |
1193 | |
1194 //connect current to insert_pt | |
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1195 _igvn.replace_input_of(current, MemNode::Memory, insert_pt); |
667 | 1196 } |
1197 | |
1198 //------------------------------co_locate_pack---------------------------------- | |
1199 // To schedule a store pack, we need to move any sandwiched memory ops either before | |
1200 // or after the pack, based upon dependence information: | |
1201 // (1) If any store in the pack depends on the sandwiched memory op, the | |
1202 // sandwiched memory op must be scheduled BEFORE the pack; | |
1203 // (2) If a sandwiched memory op depends on any store in the pack, the | |
1204 // sandwiched memory op must be scheduled AFTER the pack; | |
1205 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched | |
1206 // memory op (say memB), memB must be scheduled before memA. So, if memA is | |
1207 // scheduled before the pack, memB must also be scheduled before the pack; | |
1208 // (4) If there is no dependence restriction for a sandwiched memory op, we simply | |
1209 // schedule this store AFTER the pack | |
1210 // (5) We know there is no dependence cycle, so there in no other case; | |
1211 // (6) Finally, all memory ops in another single pack should be moved in the same direction. | |
1212 // | |
952 | 1213 // To schedule a load pack, we use the memory state of either the first or the last load in |
1214 // the pack, based on the dependence constraint. | |
0 | 1215 void SuperWord::co_locate_pack(Node_List* pk) { |
1216 if (pk->at(0)->is_Store()) { | |
1217 MemNode* first = executed_first(pk)->as_Mem(); | |
1218 MemNode* last = executed_last(pk)->as_Mem(); | |
667 | 1219 Unique_Node_List schedule_before_pack; |
1220 Unique_Node_List memops; | |
1221 | |
0 | 1222 MemNode* current = last->in(MemNode::Memory)->as_Mem(); |
667 | 1223 MemNode* previous = last; |
0 | 1224 while (true) { |
1225 assert(in_bb(current), "stay in block"); | |
667 | 1226 memops.push(previous); |
1227 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1228 Node* use = current->out(i); | |
1229 if (use->is_Mem() && use != previous) | |
1230 memops.push(use); | |
1231 } | |
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1232 if (current == first) break; |
667 | 1233 previous = current; |
1234 current = current->in(MemNode::Memory)->as_Mem(); | |
1235 } | |
1236 | |
1237 // determine which memory operations should be scheduled before the pack | |
1238 for (uint i = 1; i < memops.size(); i++) { | |
1239 Node *s1 = memops.at(i); | |
1240 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { | |
1241 for (uint j = 0; j< i; j++) { | |
1242 Node *s2 = memops.at(j); | |
1243 if (!independent(s1, s2)) { | |
1244 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { | |
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1245 schedule_before_pack.push(s1); // s1 must be scheduled before |
667 | 1246 Node_List* mem_pk = my_pack(s1); |
1247 if (mem_pk != NULL) { | |
1248 for (uint ii = 0; ii < mem_pk->size(); ii++) { | |
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1249 Node* s = mem_pk->at(ii); // follow partner |
667 | 1250 if (memops.member(s) && !schedule_before_pack.member(s)) |
1251 schedule_before_pack.push(s); | |
1252 } | |
1253 } | |
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1254 break; |
667 | 1255 } |
1256 } | |
1257 } | |
1258 } | |
1259 } | |
1260 | |
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1261 Node* upper_insert_pt = first->in(MemNode::Memory); |
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1262 // Following code moves loads connected to upper_insert_pt below aliased stores. |
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1263 // Collect such loads here and reconnect them back to upper_insert_pt later. |
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1264 memops.clear(); |
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1265 for (DUIterator i = upper_insert_pt->outs(); upper_insert_pt->has_out(i); i++) { |
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1266 Node* use = upper_insert_pt->out(i); |
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1267 if (use->is_Mem() && !use->is_Store()) { |
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1268 memops.push(use); |
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1269 } |
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1270 } |
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1271 |
667 | 1272 MemNode* lower_insert_pt = last; |
1273 previous = last; //previous store in pk | |
1274 current = last->in(MemNode::Memory)->as_Mem(); | |
1275 | |
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1276 // start scheduling from "last" to "first" |
667 | 1277 while (true) { |
1278 assert(in_bb(current), "stay in block"); | |
1279 assert(in_pack(previous, pk), "previous stays in pack"); | |
0 | 1280 Node* my_mem = current->in(MemNode::Memory); |
667 | 1281 |
0 | 1282 if (in_pack(current, pk)) { |
667 | 1283 // Forward users of my memory state (except "previous) to my input memory state |
0 | 1284 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1285 Node* use = current->out(i); | |
667 | 1286 if (use->is_Mem() && use != previous) { |
0 | 1287 assert(use->in(MemNode::Memory) == current, "must be"); |
667 | 1288 if (schedule_before_pack.member(use)) { |
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1289 _igvn.replace_input_of(use, MemNode::Memory, upper_insert_pt); |
667 | 1290 } else { |
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1291 _igvn.replace_input_of(use, MemNode::Memory, lower_insert_pt); |
667 | 1292 } |
0 | 1293 --i; // deleted this edge; rescan position |
1294 } | |
1295 } | |
667 | 1296 previous = current; |
1297 } else { // !in_pack(current, pk) ==> a sandwiched store | |
1298 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); | |
0 | 1299 } |
667 | 1300 |
0 | 1301 if (current == first) break; |
1302 current = my_mem->as_Mem(); | |
667 | 1303 } // end while |
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1304 |
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1305 // Reconnect loads back to upper_insert_pt. |
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1306 for (uint i = 0; i < memops.size(); i++) { |
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1307 Node *ld = memops.at(i); |
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1308 if (ld->in(MemNode::Memory) != upper_insert_pt) { |
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1309 _igvn.replace_input_of(ld, MemNode::Memory, upper_insert_pt); |
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1310 } |
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1311 } |
667 | 1312 } else if (pk->at(0)->is_Load()) { //load |
952 | 1313 // all loads in the pack should have the same memory state. By default, |
1314 // we use the memory state of the last load. However, if any load could | |
1315 // not be moved down due to the dependence constraint, we use the memory | |
1316 // state of the first load. | |
1317 Node* last_mem = executed_last(pk)->in(MemNode::Memory); | |
1318 Node* first_mem = executed_first(pk)->in(MemNode::Memory); | |
1319 bool schedule_last = true; | |
1320 for (uint i = 0; i < pk->size(); i++) { | |
1321 Node* ld = pk->at(i); | |
1322 for (Node* current = last_mem; current != ld->in(MemNode::Memory); | |
1323 current=current->in(MemNode::Memory)) { | |
1324 assert(current != first_mem, "corrupted memory graph"); | |
1325 if(current->is_Mem() && !independent(current, ld)){ | |
1326 schedule_last = false; // a later store depends on this load | |
1327 break; | |
1328 } | |
1329 } | |
1330 } | |
1331 | |
1332 Node* mem_input = schedule_last ? last_mem : first_mem; | |
1333 _igvn.hash_delete(mem_input); | |
1334 // Give each load the same memory state | |
0 | 1335 for (uint i = 0; i < pk->size(); i++) { |
1336 LoadNode* ld = pk->at(i)->as_Load(); | |
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1337 _igvn.replace_input_of(ld, MemNode::Memory, mem_input); |
0 | 1338 } |
1339 } | |
1340 } | |
1341 | |
1342 //------------------------------output--------------------------- | |
1343 // Convert packs into vector node operations | |
1344 void SuperWord::output() { | |
1345 if (_packset.length() == 0) return; | |
1346 | |
2445 | 1347 #ifndef PRODUCT |
1348 if (TraceLoopOpts) { | |
1349 tty->print("SuperWord "); | |
1350 lpt()->dump_head(); | |
1351 } | |
1352 #endif | |
1353 | |
0 | 1354 // MUST ENSURE main loop's initial value is properly aligned: |
1355 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
1356 | |
1357 align_initial_loop_index(align_to_ref()); | |
1358 | |
1359 // Insert extract (unpack) operations for scalar uses | |
1360 for (int i = 0; i < _packset.length(); i++) { | |
1361 insert_extracts(_packset.at(i)); | |
1362 } | |
1363 | |
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1364 Compile* C = _phase->C; |
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1365 uint max_vlen_in_bytes = 0; |
0 | 1366 for (int i = 0; i < _block.length(); i++) { |
1367 Node* n = _block.at(i); | |
1368 Node_List* p = my_pack(n); | |
1369 if (p && n == executed_last(p)) { | |
1370 uint vlen = p->size(); | |
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1371 uint vlen_in_bytes = 0; |
0 | 1372 Node* vn = NULL; |
1373 Node* low_adr = p->at(0); | |
1374 Node* first = executed_first(p); | |
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1375 int opc = n->Opcode(); |
0 | 1376 if (n->is_Load()) { |
1377 Node* ctl = n->in(MemNode::Control); | |
1378 Node* mem = first->in(MemNode::Memory); | |
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1379 SWPointer p1(n->as_Mem(), this); |
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1380 // Identify the memory dependency for the new loadVector node by |
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1381 // walking up through memory chain. |
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1382 // This is done to give flexibility to the new loadVector node so that |
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1383 // it can move above independent storeVector nodes. |
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1384 while (mem->is_StoreVector()) { |
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1385 SWPointer p2(mem->as_Mem(), this); |
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1386 int cmp = p1.cmp(p2); |
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1387 if (SWPointer::not_equal(cmp) || !SWPointer::comparable(cmp)) { |
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1388 mem = mem->in(MemNode::Memory); |
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1389 } else { |
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1390 break; // dependent memory |
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1391 } |
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1392 } |
0 | 1393 Node* adr = low_adr->in(MemNode::Address); |
1394 const TypePtr* atyp = n->adr_type(); | |
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1395 vn = LoadVectorNode::make(C, opc, ctl, mem, adr, atyp, vlen, velt_basic_type(n)); |
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1396 vlen_in_bytes = vn->as_LoadVector()->memory_size(); |
0 | 1397 } else if (n->is_Store()) { |
1398 // Promote value to be stored to vector | |
3842 | 1399 Node* val = vector_opd(p, MemNode::ValueIn); |
0 | 1400 Node* ctl = n->in(MemNode::Control); |
1401 Node* mem = first->in(MemNode::Memory); | |
1402 Node* adr = low_adr->in(MemNode::Address); | |
1403 const TypePtr* atyp = n->adr_type(); | |
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1404 vn = StoreVectorNode::make(C, opc, ctl, mem, adr, atyp, val, vlen); |
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1405 vlen_in_bytes = vn->as_StoreVector()->memory_size(); |
0 | 1406 } else if (n->req() == 3) { |
1407 // Promote operands to vector | |
1408 Node* in1 = vector_opd(p, 1); | |
1409 Node* in2 = vector_opd(p, 2); | |
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1410 if (VectorNode::is_invariant_vector(in1) && (n->is_Add() || n->is_Mul())) { |
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1411 // Move invariant vector input into second position to avoid register spilling. |
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1412 Node* tmp = in1; |
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1413 in1 = in2; |
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1414 in2 = tmp; |
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1415 } |
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1416 vn = VectorNode::make(C, opc, in1, in2, vlen, velt_basic_type(n)); |
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1417 vlen_in_bytes = vn->as_Vector()->length_in_bytes(); |
0 | 1418 } else { |
1419 ShouldNotReachHere(); | |
1420 } | |
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1421 assert(vn != NULL, "sanity"); |
6803 | 1422 _igvn.register_new_node_with_optimizer(vn); |
0 | 1423 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); |
1424 for (uint j = 0; j < p->size(); j++) { | |
1425 Node* pm = p->at(j); | |
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1426 _igvn.replace_node(pm, vn); |
0 | 1427 } |
1428 _igvn._worklist.push(vn); | |
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1429 |
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1430 if (vlen_in_bytes > max_vlen_in_bytes) { |
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1431 max_vlen_in_bytes = vlen_in_bytes; |
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1432 } |
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1433 #ifdef ASSERT |
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1434 if (TraceNewVectors) { |
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1435 tty->print("new Vector node: "); |
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1436 vn->dump(); |
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1437 } |
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1438 #endif |
0 | 1439 } |
1440 } | |
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1441 C->set_max_vector_size(max_vlen_in_bytes); |
0 | 1442 } |
1443 | |
1444 //------------------------------vector_opd--------------------------- | |
1445 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
3842 | 1446 Node* SuperWord::vector_opd(Node_List* p, int opd_idx) { |
0 | 1447 Node* p0 = p->at(0); |
1448 uint vlen = p->size(); | |
1449 Node* opd = p0->in(opd_idx); | |
1450 | |
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1451 if (same_inputs(p, opd_idx)) { |
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1452 if (opd->is_Vector() || opd->is_LoadVector()) { |
6617 | 1453 assert(((opd_idx != 2) || !VectorNode::is_shift(p0)), "shift's count can't be vector"); |
3842 | 1454 return opd; // input is matching vector |
0 | 1455 } |
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1456 if ((opd_idx == 2) && VectorNode::is_shift(p0)) { |
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1457 Compile* C = _phase->C; |
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1458 Node* cnt = opd; |
6823 | 1459 // Vector instructions do not mask shift count, do it here. |
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1460 juint mask = (p0->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1); |
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1461 const TypeInt* t = opd->find_int_type(); |
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1462 if (t != NULL && t->is_con()) { |
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1463 juint shift = t->get_con(); |
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1464 if (shift > mask) { // Unsigned cmp |
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1465 cnt = ConNode::make(C, TypeInt::make(shift & mask)); |
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1466 } |
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1467 } else { |
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1468 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) { |
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1469 cnt = ConNode::make(C, TypeInt::make(mask)); |
6803 | 1470 _igvn.register_new_node_with_optimizer(cnt); |
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1471 cnt = new (C) AndINode(opd, cnt); |
6803 | 1472 _igvn.register_new_node_with_optimizer(cnt); |
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1473 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); |
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1474 } |
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1475 assert(opd->bottom_type()->isa_int(), "int type only"); |
6823 | 1476 // Move non constant shift count into vector register. |
1477 cnt = VectorNode::shift_count(C, p0, cnt, vlen, velt_basic_type(p0)); | |
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1478 } |
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1479 if (cnt != opd) { |
6803 | 1480 _igvn.register_new_node_with_optimizer(cnt); |
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1481 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); |
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1482 } |
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1483 return cnt; |
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1484 } |
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1485 assert(!opd->is_StoreVector(), "such vector is not expected here"); |
6045 | 1486 // Convert scalar input to vector with the same number of elements as |
1487 // p0's vector. Use p0's type because size of operand's container in | |
1488 // vector should match p0's size regardless operand's size. | |
1489 const Type* p0_t = velt_type(p0); | |
1490 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, p0_t); | |
0 | 1491 |
6803 | 1492 _igvn.register_new_node_with_optimizer(vn); |
0 | 1493 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); |
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1494 #ifdef ASSERT |
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1495 if (TraceNewVectors) { |
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1496 tty->print("new Vector node: "); |
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1497 vn->dump(); |
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1498 } |
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1499 #endif |
0 | 1500 return vn; |
1501 } | |
1502 | |
1503 // Insert pack operation | |
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1504 BasicType bt = velt_basic_type(p0); |
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1505 PackNode* pk = PackNode::make(_phase->C, opd, vlen, bt); |
6045 | 1506 DEBUG_ONLY( const BasicType opd_bt = opd->bottom_type()->basic_type(); ) |
0 | 1507 |
1508 for (uint i = 1; i < vlen; i++) { | |
1509 Node* pi = p->at(i); | |
1510 Node* in = pi->in(opd_idx); | |
1511 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
6045 | 1512 assert(opd_bt == in->bottom_type()->basic_type(), "all same type"); |
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1513 pk->add_opd(in); |
0 | 1514 } |
6803 | 1515 _igvn.register_new_node_with_optimizer(pk); |
0 | 1516 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); |
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1517 #ifdef ASSERT |
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1518 if (TraceNewVectors) { |
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1519 tty->print("new Vector node: "); |
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1520 pk->dump(); |
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1521 } |
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1522 #endif |
0 | 1523 return pk; |
1524 } | |
1525 | |
1526 //------------------------------insert_extracts--------------------------- | |
1527 // If a use of pack p is not a vector use, then replace the | |
1528 // use with an extract operation. | |
1529 void SuperWord::insert_extracts(Node_List* p) { | |
1530 if (p->at(0)->is_Store()) return; | |
1531 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1532 | |
1533 // Inspect each use of each pack member. For each use that is | |
1534 // not a vector use, replace the use with an extract operation. | |
1535 | |
1536 for (uint i = 0; i < p->size(); i++) { | |
1537 Node* def = p->at(i); | |
1538 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1539 Node* use = def->fast_out(j); | |
1540 for (uint k = 0; k < use->req(); k++) { | |
1541 Node* n = use->in(k); | |
1542 if (def == n) { | |
1543 if (!is_vector_use(use, k)) { | |
1544 _n_idx_list.push(use, k); | |
1545 } | |
1546 } | |
1547 } | |
1548 } | |
1549 } | |
1550 | |
1551 while (_n_idx_list.is_nonempty()) { | |
1552 Node* use = _n_idx_list.node(); | |
1553 int idx = _n_idx_list.index(); | |
1554 _n_idx_list.pop(); | |
1555 Node* def = use->in(idx); | |
1556 | |
1557 // Insert extract operation | |
1558 _igvn.hash_delete(def); | |
1559 int def_pos = alignment(def) / data_size(def); | |
1560 | |
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1561 Node* ex = ExtractNode::make(_phase->C, def, def_pos, velt_basic_type(def)); |
6803 | 1562 _igvn.register_new_node_with_optimizer(ex); |
0 | 1563 _phase->set_ctrl(ex, _phase->get_ctrl(def)); |
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1564 _igvn.replace_input_of(use, idx, ex); |
0 | 1565 _igvn._worklist.push(def); |
1566 | |
1567 bb_insert_after(ex, bb_idx(def)); | |
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1568 set_velt_type(ex, velt_type(def)); |
0 | 1569 } |
1570 } | |
1571 | |
1572 //------------------------------is_vector_use--------------------------- | |
1573 // Is use->in(u_idx) a vector use? | |
1574 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1575 Node_List* u_pk = my_pack(use); | |
1576 if (u_pk == NULL) return false; | |
1577 Node* def = use->in(u_idx); | |
1578 Node_List* d_pk = my_pack(def); | |
1579 if (d_pk == NULL) { | |
1580 // check for scalar promotion | |
1581 Node* n = u_pk->at(0)->in(u_idx); | |
1582 for (uint i = 1; i < u_pk->size(); i++) { | |
1583 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1584 } | |
1585 return true; | |
1586 } | |
1587 if (u_pk->size() != d_pk->size()) | |
1588 return false; | |
1589 for (uint i = 0; i < u_pk->size(); i++) { | |
1590 Node* ui = u_pk->at(i); | |
1591 Node* di = d_pk->at(i); | |
1592 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1593 return false; | |
1594 } | |
1595 return true; | |
1596 } | |
1597 | |
1598 //------------------------------construct_bb--------------------------- | |
1599 // Construct reverse postorder list of block members | |
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1600 bool SuperWord::construct_bb() { |
0 | 1601 Node* entry = bb(); |
1602 | |
1603 assert(_stk.length() == 0, "stk is empty"); | |
1604 assert(_block.length() == 0, "block is empty"); | |
1605 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1606 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1607 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1608 | |
1609 // Find non-control nodes with no inputs from within block, | |
1610 // create a temporary map from node _idx to bb_idx for use | |
1611 // by the visited and post_visited sets, | |
1612 // and count number of nodes in block. | |
1613 int bb_ct = 0; | |
1614 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1615 Node *n = lpt()->_body.at(i); | |
1616 set_bb_idx(n, i); // Create a temporary map | |
1617 if (in_bb(n)) { | |
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1618 if (n->is_LoadStore() || n->is_MergeMem() || |
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1619 (n->is_Proj() && !n->as_Proj()->is_CFG())) { |
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1620 // Bailout if the loop has LoadStore, MergeMem or data Proj |
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1621 // nodes. Superword optimization does not work with them. |
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1622 return false; |
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1623 } |
0 | 1624 bb_ct++; |
1625 if (!n->is_CFG()) { | |
1626 bool found = false; | |
1627 for (uint j = 0; j < n->req(); j++) { | |
1628 Node* def = n->in(j); | |
1629 if (def && in_bb(def)) { | |
1630 found = true; | |
1631 break; | |
1632 } | |
1633 } | |
1634 if (!found) { | |
1635 assert(n != entry, "can't be entry"); | |
1636 _data_entry.push(n); | |
1637 } | |
1638 } | |
1639 } | |
1640 } | |
1641 | |
1642 // Find memory slices (head and tail) | |
1643 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1644 Node *n = lp()->fast_out(i); | |
1645 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1646 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
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1647 if (n_tail != n->in(LoopNode::EntryControl)) { |
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1648 if (!n_tail->is_Mem()) { |
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1649 assert(n_tail->is_Mem(), err_msg_res("unexpected node for memory slice: %s", n_tail->Name())); |
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1650 return false; // Bailout |
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1651 } |
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1652 _mem_slice_head.push(n); |
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1653 _mem_slice_tail.push(n_tail); |
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1654 } |
0 | 1655 } |
1656 } | |
1657 | |
1658 // Create an RPO list of nodes in block | |
1659 | |
1660 visited_clear(); | |
1661 post_visited_clear(); | |
1662 | |
1663 // Push all non-control nodes with no inputs from within block, then control entry | |
1664 for (int j = 0; j < _data_entry.length(); j++) { | |
1665 Node* n = _data_entry.at(j); | |
1666 visited_set(n); | |
1667 _stk.push(n); | |
1668 } | |
1669 visited_set(entry); | |
1670 _stk.push(entry); | |
1671 | |
1672 // Do a depth first walk over out edges | |
1673 int rpo_idx = bb_ct - 1; | |
1674 int size; | |
1675 while ((size = _stk.length()) > 0) { | |
1676 Node* n = _stk.top(); // Leave node on stack | |
1677 if (!visited_test_set(n)) { | |
1678 // forward arc in graph | |
1679 } else if (!post_visited_test(n)) { | |
1680 // cross or back arc | |
1681 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1682 Node *use = n->fast_out(i); | |
1683 if (in_bb(use) && !visited_test(use) && | |
1684 // Don't go around backedge | |
1685 (!use->is_Phi() || n == entry)) { | |
1686 _stk.push(use); | |
1687 } | |
1688 } | |
1689 if (_stk.length() == size) { | |
1690 // There were no additional uses, post visit node now | |
1691 _stk.pop(); // Remove node from stack | |
1692 assert(rpo_idx >= 0, ""); | |
1693 _block.at_put_grow(rpo_idx, n); | |
1694 rpo_idx--; | |
1695 post_visited_set(n); | |
1696 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1697 } | |
1698 } else { | |
1699 _stk.pop(); // Remove post-visited node from stack | |
1700 } | |
1701 } | |
1702 | |
1703 // Create real map of block indices for nodes | |
1704 for (int j = 0; j < _block.length(); j++) { | |
1705 Node* n = _block.at(j); | |
1706 set_bb_idx(n, j); | |
1707 } | |
1708 | |
1709 initialize_bb(); // Ensure extra info is allocated. | |
1710 | |
1711 #ifndef PRODUCT | |
1712 if (TraceSuperWord) { | |
1713 print_bb(); | |
1714 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1715 for (int m = 0; m < _data_entry.length(); m++) { | |
1716 tty->print("%3d ", m); | |
1717 _data_entry.at(m)->dump(); | |
1718 } | |
1719 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1720 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1721 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1722 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1723 } | |
1724 } | |
1725 #endif | |
1726 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
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1727 return (_mem_slice_head.length() > 0) || (_data_entry.length() > 0); |
0 | 1728 } |
1729 | |
1730 //------------------------------initialize_bb--------------------------- | |
1731 // Initialize per node info | |
1732 void SuperWord::initialize_bb() { | |
1733 Node* last = _block.at(_block.length() - 1); | |
1734 grow_node_info(bb_idx(last)); | |
1735 } | |
1736 | |
1737 //------------------------------bb_insert_after--------------------------- | |
1738 // Insert n into block after pos | |
1739 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1740 int n_pos = pos + 1; | |
1741 // Make room | |
1742 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1743 _block.at_put_grow(i+1, _block.at(i)); | |
1744 } | |
1745 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1746 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1747 } | |
1748 // Set value | |
1749 _block.at_put_grow(n_pos, n); | |
1750 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1751 // Adjust map from node->_idx to _block index | |
1752 for (int i = n_pos; i < _block.length(); i++) { | |
1753 set_bb_idx(_block.at(i), i); | |
1754 } | |
1755 } | |
1756 | |
1757 //------------------------------compute_max_depth--------------------------- | |
1758 // Compute max depth for expressions from beginning of block | |
1759 // Use to prune search paths during test for independence. | |
1760 void SuperWord::compute_max_depth() { | |
1761 int ct = 0; | |
1762 bool again; | |
1763 do { | |
1764 again = false; | |
1765 for (int i = 0; i < _block.length(); i++) { | |
1766 Node* n = _block.at(i); | |
1767 if (!n->is_Phi()) { | |
1768 int d_orig = depth(n); | |
1769 int d_in = 0; | |
1770 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1771 Node* pred = preds.current(); | |
1772 if (in_bb(pred)) { | |
1773 d_in = MAX2(d_in, depth(pred)); | |
1774 } | |
1775 } | |
1776 if (d_in + 1 != d_orig) { | |
1777 set_depth(n, d_in + 1); | |
1778 again = true; | |
1779 } | |
1780 } | |
1781 } | |
1782 ct++; | |
1783 } while (again); | |
1784 #ifndef PRODUCT | |
1785 if (TraceSuperWord && Verbose) | |
1786 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1787 #endif | |
1788 } | |
1789 | |
1790 //-------------------------compute_vector_element_type----------------------- | |
1791 // Compute necessary vector element type for expressions | |
1792 // This propagates backwards a narrower integer type when the | |
1793 // upper bits of the value are not needed. | |
1794 // Example: char a,b,c; a = b + c; | |
1795 // Normally the type of the add is integer, but for packed character | |
1796 // operations the type of the add needs to be char. | |
1797 void SuperWord::compute_vector_element_type() { | |
1798 #ifndef PRODUCT | |
1799 if (TraceSuperWord && Verbose) | |
1800 tty->print_cr("\ncompute_velt_type:"); | |
1801 #endif | |
1802 | |
1803 // Initial type | |
1804 for (int i = 0; i < _block.length(); i++) { | |
1805 Node* n = _block.at(i); | |
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1806 set_velt_type(n, container_type(n)); |
0 | 1807 } |
1808 | |
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1809 // Propagate integer narrowed type backwards through operations |
0 | 1810 // that don't depend on higher order bits |
1811 for (int i = _block.length() - 1; i >= 0; i--) { | |
1812 Node* n = _block.at(i); | |
1813 // Only integer types need be examined | |
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1814 const Type* vtn = velt_type(n); |
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1815 if (vtn->basic_type() == T_INT) { |
0 | 1816 uint start, end; |
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1817 VectorNode::vector_operands(n, &start, &end); |
0 | 1818 |
1819 for (uint j = start; j < end; j++) { | |
1820 Node* in = n->in(j); | |
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1821 // Don't propagate through a memory |
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1822 if (!in->is_Mem() && in_bb(in) && velt_type(in)->basic_type() == T_INT && |
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1823 data_size(n) < data_size(in)) { |
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1824 bool same_type = true; |
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1825 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { |
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1826 Node *use = in->fast_out(k); |
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1827 if (!in_bb(use) || !same_velt_type(use, n)) { |
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1828 same_type = false; |
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1829 break; |
0 | 1830 } |
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1831 } |
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1832 if (same_type) { |
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1833 // For right shifts of small integer types (bool, byte, char, short) |
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1834 // we need precise information about sign-ness. Only Load nodes have |
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1835 // this information because Store nodes are the same for signed and |
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1836 // unsigned values. And any arithmetic operation after a load may |
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1837 // expand a value to signed Int so such right shifts can't be used |
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1838 // because vector elements do not have upper bits of Int. |
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1839 const Type* vt = vtn; |
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1840 if (VectorNode::is_shift(in)) { |
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1841 Node* load = in->in(1); |
6896 | 1842 if (load->is_Load() && in_bb(load) && (velt_type(load)->basic_type() == T_INT)) { |
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1843 vt = velt_type(load); |
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1844 } else if (in->Opcode() != Op_LShiftI) { |
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1845 // Widen type to Int to avoid creation of right shift vector |
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1846 // (align + data_size(s1) check in stmts_can_pack() will fail). |
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1847 // Note, left shifts work regardless type. |
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1848 vt = TypeInt::INT; |
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1849 } |
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1850 } |
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1851 set_velt_type(in, vt); |
0 | 1852 } |
1853 } | |
1854 } | |
1855 } | |
1856 } | |
1857 #ifndef PRODUCT | |
1858 if (TraceSuperWord && Verbose) { | |
1859 for (int i = 0; i < _block.length(); i++) { | |
1860 Node* n = _block.at(i); | |
1861 velt_type(n)->dump(); | |
1862 tty->print("\t"); | |
1863 n->dump(); | |
1864 } | |
1865 } | |
1866 #endif | |
1867 } | |
1868 | |
1869 //------------------------------memory_alignment--------------------------- | |
1870 // Alignment within a vector memory reference | |
6794 | 1871 int SuperWord::memory_alignment(MemNode* s, int iv_adjust) { |
0 | 1872 SWPointer p(s, this); |
1873 if (!p.valid()) { | |
1874 return bottom_align; | |
1875 } | |
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1876 int vw = vector_width_in_bytes(s); |
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1877 if (vw < 2) { |
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1878 return bottom_align; // No vectors for this type |
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1879 } |
0 | 1880 int offset = p.offset_in_bytes(); |
6794 | 1881 offset += iv_adjust*p.memory_size(); |
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1882 int off_rem = offset % vw; |
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1883 int off_mod = off_rem >= 0 ? off_rem : off_rem + vw; |
0 | 1884 return off_mod; |
1885 } | |
1886 | |
1887 //---------------------------container_type--------------------------- | |
1888 // Smallest type containing range of values | |
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1889 const Type* SuperWord::container_type(Node* n) { |
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1890 if (n->is_Mem()) { |
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1891 BasicType bt = n->as_Mem()->memory_type(); |
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1892 if (n->is_Store() && (bt == T_CHAR)) { |
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1893 // Use T_SHORT type instead of T_CHAR for stored values because any |
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1894 // preceding arithmetic operation extends values to signed Int. |
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1895 bt = T_SHORT; |
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1896 } |
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1897 if (n->Opcode() == Op_LoadUB) { |
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1898 // Adjust type for unsigned byte loads, it is important for right shifts. |
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1899 // T_BOOLEAN is used because there is no basic type representing type |
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1900 // TypeInt::UBYTE. Use of T_BOOLEAN for vectors is fine because only |
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1901 // size (one byte) and sign is important. |
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1902 bt = T_BOOLEAN; |
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1903 } |
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1904 return Type::get_const_basic_type(bt); |
0 | 1905 } |
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1906 const Type* t = _igvn.type(n); |
0 | 1907 if (t->basic_type() == T_INT) { |
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1908 // A narrow type of arithmetic operations will be determined by |
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1909 // propagating the type of memory operations. |
0 | 1910 return TypeInt::INT; |
1911 } | |
1912 return t; | |
1913 } | |
1914 | |
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1915 bool SuperWord::same_velt_type(Node* n1, Node* n2) { |
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1916 const Type* vt1 = velt_type(n1); |
6794 | 1917 const Type* vt2 = velt_type(n2); |
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1918 if (vt1->basic_type() == T_INT && vt2->basic_type() == T_INT) { |
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1919 // Compare vectors element sizes for integer types. |
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1920 return data_size(n1) == data_size(n2); |
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1921 } |
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1922 return vt1 == vt2; |
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1923 } |
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1924 |
0 | 1925 //------------------------------in_packset--------------------------- |
1926 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1927 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1928 for (int i = 0; i < _packset.length(); i++) { | |
1929 Node_List* p = _packset.at(i); | |
1930 assert(p->size() == 2, "must be"); | |
1931 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1932 return true; | |
1933 } | |
1934 } | |
1935 return false; | |
1936 } | |
1937 | |
1938 //------------------------------in_pack--------------------------- | |
1939 // Is s in pack p? | |
1940 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1941 for (uint i = 0; i < p->size(); i++) { | |
1942 if (p->at(i) == s) { | |
1943 return p; | |
1944 } | |
1945 } | |
1946 return NULL; | |
1947 } | |
1948 | |
1949 //------------------------------remove_pack_at--------------------------- | |
1950 // Remove the pack at position pos in the packset | |
1951 void SuperWord::remove_pack_at(int pos) { | |
1952 Node_List* p = _packset.at(pos); | |
1953 for (uint i = 0; i < p->size(); i++) { | |
1954 Node* s = p->at(i); | |
1955 set_my_pack(s, NULL); | |
1956 } | |
1957 _packset.remove_at(pos); | |
1958 } | |
1959 | |
1960 //------------------------------executed_first--------------------------- | |
1961 // Return the node executed first in pack p. Uses the RPO block list | |
1962 // to determine order. | |
1963 Node* SuperWord::executed_first(Node_List* p) { | |
1964 Node* n = p->at(0); | |
1965 int n_rpo = bb_idx(n); | |
1966 for (uint i = 1; i < p->size(); i++) { | |
1967 Node* s = p->at(i); | |
1968 int s_rpo = bb_idx(s); | |
1969 if (s_rpo < n_rpo) { | |
1970 n = s; | |
1971 n_rpo = s_rpo; | |
1972 } | |
1973 } | |
1974 return n; | |
1975 } | |
1976 | |
1977 //------------------------------executed_last--------------------------- | |
1978 // Return the node executed last in pack p. | |
1979 Node* SuperWord::executed_last(Node_List* p) { | |
1980 Node* n = p->at(0); | |
1981 int n_rpo = bb_idx(n); | |
1982 for (uint i = 1; i < p->size(); i++) { | |
1983 Node* s = p->at(i); | |
1984 int s_rpo = bb_idx(s); | |
1985 if (s_rpo > n_rpo) { | |
1986 n = s; | |
1987 n_rpo = s_rpo; | |
1988 } | |
1989 } | |
1990 return n; | |
1991 } | |
1992 | |
1993 //----------------------------align_initial_loop_index--------------------------- | |
1994 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1995 // to align_to_ref will be a position zero in the vector. | |
1996 // (iv + k) mod vector_align == 0 | |
1997 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1998 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1999 assert(main_head->is_main_loop(), ""); | |
2000 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
2001 assert(pre_end != NULL, ""); | |
2002 Node *pre_opaq1 = pre_end->limit(); | |
2003 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
2004 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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2005 Node *lim0 = pre_opaq->in(1); |
0 | 2006 |
2007 // Where we put new limit calculations | |
2008 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
2009 | |
2010 // Ensure the original loop limit is available from the | |
2011 // pre-loop Opaque1 node. | |
2012 Node *orig_limit = pre_opaq->original_loop_limit(); | |
2013 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
2014 | |
2015 SWPointer align_to_ref_p(align_to_ref, this); | |
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2016 assert(align_to_ref_p.valid(), "sanity"); |
0 | 2017 |
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2018 // Given: |
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2019 // lim0 == original pre loop limit |
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2020 // V == v_align (power of 2) |
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2021 // invar == extra invariant piece of the address expression |
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2022 // e == offset [ +/- invar ] |
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2023 // |
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2024 // When reassociating expressions involving '%' the basic rules are: |
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2025 // (a - b) % k == 0 => a % k == b % k |
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2026 // and: |
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2027 // (a + b) % k == 0 => a % k == (k - b) % k |
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2028 // |
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2029 // For stride > 0 && scale > 0, |
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2030 // Derive the new pre-loop limit "lim" such that the two constraints: |
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2031 // (1) lim = lim0 + N (where N is some positive integer < V) |
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2032 // (2) (e + lim) % V == 0 |
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2033 // are true. |
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2034 // |
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2035 // Substituting (1) into (2), |
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2036 // (e + lim0 + N) % V == 0 |
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2037 // solve for N: |
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2038 // N = (V - (e + lim0)) % V |
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2039 // substitute back into (1), so that new limit |
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2040 // lim = lim0 + (V - (e + lim0)) % V |
0 | 2041 // |
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2042 // For stride > 0 && scale < 0 |
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2043 // Constraints: |
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2044 // lim = lim0 + N |
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2045 // (e - lim) % V == 0 |
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2046 // Solving for lim: |
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2047 // (e - lim0 - N) % V == 0 |
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2048 // N = (e - lim0) % V |
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2049 // lim = lim0 + (e - lim0) % V |
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2050 // |
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2051 // For stride < 0 && scale > 0 |
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2052 // Constraints: |
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2053 // lim = lim0 - N |
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2054 // (e + lim) % V == 0 |
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2055 // Solving for lim: |
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2056 // (e + lim0 - N) % V == 0 |
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2057 // N = (e + lim0) % V |
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2058 // lim = lim0 - (e + lim0) % V |
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2059 // |
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2060 // For stride < 0 && scale < 0 |
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2061 // Constraints: |
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2062 // lim = lim0 - N |
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2063 // (e - lim) % V == 0 |
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2064 // Solving for lim: |
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2065 // (e - lim0 + N) % V == 0 |
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2066 // N = (V - (e - lim0)) % V |
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2067 // lim = lim0 - (V - (e - lim0)) % V |
0 | 2068 |
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2069 int vw = vector_width_in_bytes(align_to_ref); |
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2070 int stride = iv_stride(); |
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2071 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 2072 int elt_size = align_to_ref_p.memory_size(); |
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2073 int v_align = vw / elt_size; |
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2074 assert(v_align > 1, "sanity"); |
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2075 int offset = align_to_ref_p.offset_in_bytes() / elt_size; |
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2076 Node *offsn = _igvn.intcon(offset); |
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2077 |
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2078 Node *e = offsn; |
0 | 2079 if (align_to_ref_p.invar() != NULL) { |
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2080 // incorporate any extra invariant piece producing (offset +/- invar) >>> log2(elt) |
0 | 2081 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
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2082 Node* aref = new (_phase->C) URShiftINode(align_to_ref_p.invar(), log2_elt); |
6803 | 2083 _igvn.register_new_node_with_optimizer(aref); |
0 | 2084 _phase->set_ctrl(aref, pre_ctrl); |
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2085 if (align_to_ref_p.negate_invar()) { |
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2086 e = new (_phase->C) SubINode(e, aref); |
0 | 2087 } else { |
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2088 e = new (_phase->C) AddINode(e, aref); |
0 | 2089 } |
6803 | 2090 _igvn.register_new_node_with_optimizer(e); |
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2091 _phase->set_ctrl(e, pre_ctrl); |
0 | 2092 } |
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2093 if (vw > ObjectAlignmentInBytes) { |
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2094 // incorporate base e +/- base && Mask >>> log2(elt) |
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2095 Node* xbase = new(_phase->C) CastP2XNode(NULL, align_to_ref_p.base()); |
6803 | 2096 _igvn.register_new_node_with_optimizer(xbase); |
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2097 #ifdef _LP64 |
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2098 xbase = new (_phase->C) ConvL2INode(xbase); |
6803 | 2099 _igvn.register_new_node_with_optimizer(xbase); |
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2100 #endif |
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2101 Node* mask = _igvn.intcon(vw-1); |
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2102 Node* masked_xbase = new (_phase->C) AndINode(xbase, mask); |
6803 | 2103 _igvn.register_new_node_with_optimizer(masked_xbase); |
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2104 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
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2105 Node* bref = new (_phase->C) URShiftINode(masked_xbase, log2_elt); |
6803 | 2106 _igvn.register_new_node_with_optimizer(bref); |
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2107 _phase->set_ctrl(bref, pre_ctrl); |
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2108 e = new (_phase->C) AddINode(e, bref); |
6803 | 2109 _igvn.register_new_node_with_optimizer(e); |
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2110 _phase->set_ctrl(e, pre_ctrl); |
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2111 } |
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2112 |
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2113 // compute e +/- lim0 |
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2114 if (scale < 0) { |
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2115 e = new (_phase->C) SubINode(e, lim0); |
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2116 } else { |
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2117 e = new (_phase->C) AddINode(e, lim0); |
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2118 } |
6803 | 2119 _igvn.register_new_node_with_optimizer(e); |
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2120 _phase->set_ctrl(e, pre_ctrl); |
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2121 |
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2122 if (stride * scale > 0) { |
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2123 // compute V - (e +/- lim0) |
0 | 2124 Node* va = _igvn.intcon(v_align); |
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2125 e = new (_phase->C) SubINode(va, e); |
6803 | 2126 _igvn.register_new_node_with_optimizer(e); |
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2127 _phase->set_ctrl(e, pre_ctrl); |
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2128 } |
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2129 // compute N = (exp) % V |
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2130 Node* va_msk = _igvn.intcon(v_align - 1); |
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2131 Node* N = new (_phase->C) AndINode(e, va_msk); |
6803 | 2132 _igvn.register_new_node_with_optimizer(N); |
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2133 _phase->set_ctrl(N, pre_ctrl); |
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2134 |
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2135 // substitute back into (1), so that new limit |
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2136 // lim = lim0 + N |
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2137 Node* lim; |
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2138 if (stride < 0) { |
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2139 lim = new (_phase->C) SubINode(lim0, N); |
0 | 2140 } else { |
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2141 lim = new (_phase->C) AddINode(lim0, N); |
0 | 2142 } |
6803 | 2143 _igvn.register_new_node_with_optimizer(lim); |
72
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2144 _phase->set_ctrl(lim, pre_ctrl); |
0 | 2145 Node* constrained = |
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2146 (stride > 0) ? (Node*) new (_phase->C) MinINode(lim, orig_limit) |
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2147 : (Node*) new (_phase->C) MaxINode(lim, orig_limit); |
6803 | 2148 _igvn.register_new_node_with_optimizer(constrained); |
0 | 2149 _phase->set_ctrl(constrained, pre_ctrl); |
2150 _igvn.hash_delete(pre_opaq); | |
2151 pre_opaq->set_req(1, constrained); | |
2152 } | |
2153 | |
2154 //----------------------------get_pre_loop_end--------------------------- | |
2155 // Find pre loop end from main loop. Returns null if none. | |
2156 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
2157 Node *ctrl = cl->in(LoopNode::EntryControl); | |
2158 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
2159 Node *iffm = ctrl->in(0); | |
2160 if (!iffm->is_If()) return NULL; | |
2161 Node *p_f = iffm->in(0); | |
2162 if (!p_f->is_IfFalse()) return NULL; | |
2163 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
2164 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
2165 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
2166 return pre_end; | |
2167 } | |
2168 | |
2169 | |
2170 //------------------------------init--------------------------- | |
2171 void SuperWord::init() { | |
2172 _dg.init(); | |
2173 _packset.clear(); | |
2174 _disjoint_ptrs.clear(); | |
2175 _block.clear(); | |
2176 _data_entry.clear(); | |
2177 _mem_slice_head.clear(); | |
2178 _mem_slice_tail.clear(); | |
2179 _node_info.clear(); | |
2180 _align_to_ref = NULL; | |
2181 _lpt = NULL; | |
2182 _lp = NULL; | |
2183 _bb = NULL; | |
2184 _iv = NULL; | |
2185 } | |
2186 | |
2187 //------------------------------print_packset--------------------------- | |
2188 void SuperWord::print_packset() { | |
2189 #ifndef PRODUCT | |
2190 tty->print_cr("packset"); | |
2191 for (int i = 0; i < _packset.length(); i++) { | |
2192 tty->print_cr("Pack: %d", i); | |
2193 Node_List* p = _packset.at(i); | |
2194 print_pack(p); | |
2195 } | |
2196 #endif | |
2197 } | |
2198 | |
2199 //------------------------------print_pack--------------------------- | |
2200 void SuperWord::print_pack(Node_List* p) { | |
2201 for (uint i = 0; i < p->size(); i++) { | |
2202 print_stmt(p->at(i)); | |
2203 } | |
2204 } | |
2205 | |
2206 //------------------------------print_bb--------------------------- | |
2207 void SuperWord::print_bb() { | |
2208 #ifndef PRODUCT | |
2209 tty->print_cr("\nBlock"); | |
2210 for (int i = 0; i < _block.length(); i++) { | |
2211 Node* n = _block.at(i); | |
2212 tty->print("%d ", i); | |
2213 if (n) { | |
2214 n->dump(); | |
2215 } | |
2216 } | |
2217 #endif | |
2218 } | |
2219 | |
2220 //------------------------------print_stmt--------------------------- | |
2221 void SuperWord::print_stmt(Node* s) { | |
2222 #ifndef PRODUCT | |
2223 tty->print(" align: %d \t", alignment(s)); | |
2224 s->dump(); | |
2225 #endif | |
2226 } | |
2227 | |
2228 //------------------------------blank--------------------------- | |
2229 char* SuperWord::blank(uint depth) { | |
2230 static char blanks[101]; | |
2231 assert(depth < 101, "too deep"); | |
2232 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
2233 blanks[depth] = '\0'; | |
2234 return blanks; | |
2235 } | |
2236 | |
2237 | |
2238 //==============================SWPointer=========================== | |
2239 | |
2240 //----------------------------SWPointer------------------------ | |
2241 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
2242 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
2243 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
2244 | |
2245 Node* adr = mem->in(MemNode::Address); | |
2246 if (!adr->is_AddP()) { | |
2247 assert(!valid(), "too complex"); | |
2248 return; | |
2249 } | |
2250 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
2251 Node* base = adr->in(AddPNode::Base); | |
23014
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2252 // The base address should be loop invariant |
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2253 if (!invariant(base)) { |
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2254 assert(!valid(), "base address is loop variant"); |
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2255 return; |
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2256 } |
1058
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2257 //unsafe reference could not be aligned appropriately without runtime checking |
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2258 if (base == NULL || base->bottom_type() == Type::TOP) { |
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2259 assert(!valid(), "unsafe access"); |
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2260 return; |
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2261 } |
0 | 2262 for (int i = 0; i < 3; i++) { |
2263 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
2264 assert(!valid(), "too complex"); | |
2265 return; | |
2266 } | |
2267 adr = adr->in(AddPNode::Address); | |
2268 if (base == adr || !adr->is_AddP()) { | |
2269 break; // stop looking at addp's | |
2270 } | |
2271 } | |
2272 _base = base; | |
2273 _adr = adr; | |
2274 assert(valid(), "Usable"); | |
2275 } | |
2276 | |
2277 // Following is used to create a temporary object during | |
2278 // the pattern match of an address expression. | |
2279 SWPointer::SWPointer(SWPointer* p) : | |
2280 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
2281 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
2282 | |
2283 //------------------------scaled_iv_plus_offset-------------------- | |
2284 // Match: k*iv + offset | |
2285 // where: k is a constant that maybe zero, and | |
2286 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
2287 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
2288 if (scaled_iv(n)) { | |
2289 return true; | |
2290 } | |
2291 if (offset_plus_k(n)) { | |
2292 return true; | |
2293 } | |
2294 int opc = n->Opcode(); | |
2295 if (opc == Op_AddI) { | |
2296 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
2297 return true; | |
2298 } | |
2299 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2300 return true; | |
2301 } | |
2302 } else if (opc == Op_SubI) { | |
2303 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
2304 return true; | |
2305 } | |
2306 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2307 _scale *= -1; | |
2308 return true; | |
2309 } | |
2310 } | |
2311 return false; | |
2312 } | |
2313 | |
2314 //----------------------------scaled_iv------------------------ | |
2315 // Match: k*iv where k is a constant that's not zero | |
2316 bool SWPointer::scaled_iv(Node* n) { | |
2317 if (_scale != 0) { | |
2318 return false; // already found a scale | |
2319 } | |
2320 if (n == iv()) { | |
2321 _scale = 1; | |
2322 return true; | |
2323 } | |
2324 int opc = n->Opcode(); | |
2325 if (opc == Op_MulI) { | |
2326 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2327 _scale = n->in(2)->get_int(); | |
2328 return true; | |
2329 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
2330 _scale = n->in(1)->get_int(); | |
2331 return true; | |
2332 } | |
2333 } else if (opc == Op_LShiftI) { | |
2334 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2335 _scale = 1 << n->in(2)->get_int(); | |
2336 return true; | |
2337 } | |
2338 } else if (opc == Op_ConvI2L) { | |
2339 if (scaled_iv_plus_offset(n->in(1))) { | |
2340 return true; | |
2341 } | |
2342 } else if (opc == Op_LShiftL) { | |
2343 if (!has_iv() && _invar == NULL) { | |
2344 // Need to preserve the current _offset value, so | |
2345 // create a temporary object for this expression subtree. | |
2346 // Hacky, so should re-engineer the address pattern match. | |
2347 SWPointer tmp(this); | |
2348 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
2349 if (tmp._invar == NULL) { | |
2350 int mult = 1 << n->in(2)->get_int(); | |
2351 _scale = tmp._scale * mult; | |
2352 _offset += tmp._offset * mult; | |
2353 return true; | |
2354 } | |
2355 } | |
2356 } | |
2357 } | |
2358 return false; | |
2359 } | |
2360 | |
2361 //----------------------------offset_plus_k------------------------ | |
2362 // Match: offset is (k [+/- invariant]) | |
2363 // where k maybe zero and invariant is optional, but not both. | |
2364 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
2365 int opc = n->Opcode(); | |
2366 if (opc == Op_ConI) { | |
2367 _offset += negate ? -(n->get_int()) : n->get_int(); | |
2368 return true; | |
2369 } else if (opc == Op_ConL) { | |
2370 // Okay if value fits into an int | |
2371 const TypeLong* t = n->find_long_type(); | |
2372 if (t->higher_equal(TypeLong::INT)) { | |
2373 jlong loff = n->get_long(); | |
2374 jint off = (jint)loff; | |
2375 _offset += negate ? -off : loff; | |
2376 return true; | |
2377 } | |
2378 return false; | |
2379 } | |
2380 if (_invar != NULL) return false; // already have an invariant | |
2381 if (opc == Op_AddI) { | |
2382 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2383 _negate_invar = negate; | |
2384 _invar = n->in(1); | |
2385 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2386 return true; | |
2387 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2388 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2389 _negate_invar = negate; | |
2390 _invar = n->in(2); | |
2391 return true; | |
2392 } | |
2393 } | |
2394 if (opc == Op_SubI) { | |
2395 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2396 _negate_invar = negate; | |
2397 _invar = n->in(1); | |
2398 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2399 return true; | |
2400 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2401 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2402 _negate_invar = !negate; | |
2403 _invar = n->in(2); | |
2404 return true; | |
2405 } | |
2406 } | |
2407 if (invariant(n)) { | |
2408 _negate_invar = negate; | |
2409 _invar = n; | |
2410 return true; | |
2411 } | |
2412 return false; | |
2413 } | |
2414 | |
2415 //----------------------------print------------------------ | |
2416 void SWPointer::print() { | |
2417 #ifndef PRODUCT | |
2418 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
2419 _base != NULL ? _base->_idx : 0, | |
2420 _adr != NULL ? _adr->_idx : 0, | |
2421 _scale, _offset, | |
2422 _negate_invar?'-':'+', | |
2423 _invar != NULL ? _invar->_idx : 0); | |
2424 #endif | |
2425 } | |
2426 | |
2427 // ========================= OrderedPair ===================== | |
2428 | |
2429 const OrderedPair OrderedPair::initial; | |
2430 | |
2431 // ========================= SWNodeInfo ===================== | |
2432 | |
2433 const SWNodeInfo SWNodeInfo::initial; | |
2434 | |
2435 | |
2436 // ============================ DepGraph =========================== | |
2437 | |
2438 //------------------------------make_node--------------------------- | |
2439 // Make a new dependence graph node for an ideal node. | |
2440 DepMem* DepGraph::make_node(Node* node) { | |
2441 DepMem* m = new (_arena) DepMem(node); | |
2442 if (node != NULL) { | |
2443 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
2444 _map.at_put_grow(node->_idx, m); | |
2445 } | |
2446 return m; | |
2447 } | |
2448 | |
2449 //------------------------------make_edge--------------------------- | |
2450 // Make a new dependence graph edge from dpred -> dsucc | |
2451 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
2452 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
2453 dpred->set_out_head(e); | |
2454 dsucc->set_in_head(e); | |
2455 return e; | |
2456 } | |
2457 | |
2458 // ========================== DepMem ======================== | |
2459 | |
2460 //------------------------------in_cnt--------------------------- | |
2461 int DepMem::in_cnt() { | |
2462 int ct = 0; | |
2463 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
2464 return ct; | |
2465 } | |
2466 | |
2467 //------------------------------out_cnt--------------------------- | |
2468 int DepMem::out_cnt() { | |
2469 int ct = 0; | |
2470 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
2471 return ct; | |
2472 } | |
2473 | |
2474 //------------------------------print----------------------------- | |
2475 void DepMem::print() { | |
2476 #ifndef PRODUCT | |
2477 tty->print(" DepNode %d (", _node->_idx); | |
2478 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
2479 Node* pred = p->pred()->node(); | |
2480 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
2481 } | |
2482 tty->print(") ["); | |
2483 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
2484 Node* succ = s->succ()->node(); | |
2485 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
2486 } | |
2487 tty->print_cr(" ]"); | |
2488 #endif | |
2489 } | |
2490 | |
2491 // =========================== DepEdge ========================= | |
2492 | |
2493 //------------------------------DepPreds--------------------------- | |
2494 void DepEdge::print() { | |
2495 #ifndef PRODUCT | |
2496 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2497 #endif | |
2498 } | |
2499 | |
2500 // =========================== DepPreds ========================= | |
2501 // Iterator over predecessor edges in the dependence graph. | |
2502 | |
2503 //------------------------------DepPreds--------------------------- | |
2504 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2505 _n = n; | |
2506 _done = false; | |
2507 if (_n->is_Store() || _n->is_Load()) { | |
2508 _next_idx = MemNode::Address; | |
2509 _end_idx = n->req(); | |
2510 _dep_next = dg.dep(_n)->in_head(); | |
2511 } else if (_n->is_Mem()) { | |
2512 _next_idx = 0; | |
2513 _end_idx = 0; | |
2514 _dep_next = dg.dep(_n)->in_head(); | |
2515 } else { | |
2516 _next_idx = 1; | |
2517 _end_idx = _n->req(); | |
2518 _dep_next = NULL; | |
2519 } | |
2520 next(); | |
2521 } | |
2522 | |
2523 //------------------------------next--------------------------- | |
2524 void DepPreds::next() { | |
2525 if (_dep_next != NULL) { | |
2526 _current = _dep_next->pred()->node(); | |
2527 _dep_next = _dep_next->next_in(); | |
2528 } else if (_next_idx < _end_idx) { | |
2529 _current = _n->in(_next_idx++); | |
2530 } else { | |
2531 _done = true; | |
2532 } | |
2533 } | |
2534 | |
2535 // =========================== DepSuccs ========================= | |
2536 // Iterator over successor edges in the dependence graph. | |
2537 | |
2538 //------------------------------DepSuccs--------------------------- | |
2539 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2540 _n = n; | |
2541 _done = false; | |
2542 if (_n->is_Load()) { | |
2543 _next_idx = 0; | |
2544 _end_idx = _n->outcnt(); | |
2545 _dep_next = dg.dep(_n)->out_head(); | |
2546 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2547 _next_idx = 0; | |
2548 _end_idx = 0; | |
2549 _dep_next = dg.dep(_n)->out_head(); | |
2550 } else { | |
2551 _next_idx = 0; | |
2552 _end_idx = _n->outcnt(); | |
2553 _dep_next = NULL; | |
2554 } | |
2555 next(); | |
2556 } | |
2557 | |
2558 //-------------------------------next--------------------------- | |
2559 void DepSuccs::next() { | |
2560 if (_dep_next != NULL) { | |
2561 _current = _dep_next->succ()->node(); | |
2562 _dep_next = _dep_next->next_out(); | |
2563 } else if (_next_idx < _end_idx) { | |
2564 _current = _n->raw_out(_next_idx++); | |
2565 } else { | |
2566 _done = true; | |
2567 } | |
2568 } |