Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/superword.cpp @ 6182:765ee2d1674b
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Reviewed-by: jrose, kvn
author | twisti |
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date | Mon, 18 Jun 2012 15:17:30 -0700 |
parents | 8c92982cbbc4 |
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0 | 1 /* |
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2 * Copyright (c) 2007, 2012, 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 | |
146 construct_bb(); | |
147 | |
148 dependence_graph(); | |
149 | |
150 compute_max_depth(); | |
151 | |
152 compute_vector_element_type(); | |
153 | |
154 // Attempt vectorization | |
155 | |
156 find_adjacent_refs(); | |
157 | |
158 extend_packlist(); | |
159 | |
160 combine_packs(); | |
161 | |
162 construct_my_pack_map(); | |
163 | |
164 filter_packs(); | |
165 | |
166 schedule(); | |
167 | |
168 output(); | |
169 } | |
170 | |
171 //------------------------------find_adjacent_refs--------------------------- | |
172 // Find the adjacent memory references and create pack pairs for them. | |
173 // This is the initial set of packs that will then be extended by | |
174 // following use->def and def->use links. The align positions are | |
175 // assigned relative to the reference "align_to_ref" | |
176 void SuperWord::find_adjacent_refs() { | |
177 // Get list of memory operations | |
178 Node_List memops; | |
179 for (int i = 0; i < _block.length(); i++) { | |
180 Node* n = _block.at(i); | |
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181 if (n->is_Mem() && !n->is_LoadStore() && in_bb(n) && |
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182 is_java_primitive(n->as_Mem()->memory_type())) { |
0 | 183 int align = memory_alignment(n->as_Mem(), 0); |
184 if (align != bottom_align) { | |
185 memops.push(n); | |
186 } | |
187 } | |
188 } | |
189 | |
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190 Node_List align_to_refs; |
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191 int best_iv_adjustment = 0; |
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192 MemNode* best_align_to_mem_ref = NULL; |
0 | 193 |
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194 while (memops.size() != 0) { |
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195 // Find a memory reference to align to. |
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196 MemNode* mem_ref = find_align_to_ref(memops); |
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197 if (mem_ref == NULL) break; |
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198 align_to_refs.push(mem_ref); |
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199 int iv_adjustment = get_iv_adjustment(mem_ref); |
0 | 200 |
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201 if (best_align_to_mem_ref == NULL) { |
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202 // Set memory reference which is the best from all memory operations |
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203 // to be used for alignment. The pre-loop trip count is modified to align |
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204 // this reference to a vector-aligned address. |
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205 best_align_to_mem_ref = mem_ref; |
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206 best_iv_adjustment = iv_adjustment; |
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207 } |
0 | 208 |
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209 SWPointer align_to_ref_p(mem_ref, this); |
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210 // Set alignment relative to "align_to_ref" for all related memory operations. |
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211 for (int i = memops.size() - 1; i >= 0; i--) { |
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212 MemNode* s = memops.at(i)->as_Mem(); |
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213 if (isomorphic(s, mem_ref)) { |
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214 SWPointer p2(s, this); |
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215 if (p2.comparable(align_to_ref_p)) { |
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216 int align = memory_alignment(s, iv_adjustment); |
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217 set_alignment(s, align); |
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218 } |
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219 } |
0 | 220 } |
221 | |
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222 // Create initial pack pairs of memory operations for which |
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223 // alignment is set and vectors will be aligned. |
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224 bool create_pack = true; |
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225 if (memory_alignment(mem_ref, best_iv_adjustment) != 0) { |
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226 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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227 // Can't allow vectorization of unaligned memory accesses with the |
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228 // same type since it could be overlapped accesses to the same array. |
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229 create_pack = false; |
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230 } else { |
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231 // Allow independent (different type) unaligned memory operations |
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232 // if HW supports them. |
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233 if (!Matcher::misaligned_vectors_ok()) { |
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234 create_pack = false; |
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235 } else { |
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236 // Check if packs of the same memory type but |
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237 // with a different alignment were created before. |
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238 for (uint i = 0; i < align_to_refs.size(); i++) { |
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239 MemNode* mr = align_to_refs.at(i)->as_Mem(); |
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240 if (same_velt_type(mr, mem_ref) && |
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241 memory_alignment(mr, iv_adjustment) != 0) |
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242 create_pack = false; |
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243 } |
0 | 244 } |
245 } | |
246 } | |
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247 if (create_pack) { |
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248 for (uint i = 0; i < memops.size(); i++) { |
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249 Node* s1 = memops.at(i); |
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250 int align = alignment(s1); |
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251 if (align == top_align) continue; |
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252 for (uint j = 0; j < memops.size(); j++) { |
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253 Node* s2 = memops.at(j); |
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254 if (alignment(s2) == top_align) continue; |
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255 if (s1 != s2 && are_adjacent_refs(s1, s2)) { |
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256 if (stmts_can_pack(s1, s2, align)) { |
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257 Node_List* pair = new Node_List(); |
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258 pair->push(s1); |
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259 pair->push(s2); |
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260 _packset.append(pair); |
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261 } |
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262 } |
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263 } |
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264 } |
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265 } else { // Don't create unaligned pack |
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266 // First, remove remaining memory ops of the same type from the list. |
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267 for (int i = memops.size() - 1; i >= 0; i--) { |
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268 MemNode* s = memops.at(i)->as_Mem(); |
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269 if (same_velt_type(s, mem_ref)) { |
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270 memops.remove(i); |
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271 } |
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272 } |
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273 |
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274 // Second, remove already constructed packs of the same type. |
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275 for (int i = _packset.length() - 1; i >= 0; i--) { |
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276 Node_List* p = _packset.at(i); |
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277 MemNode* s = p->at(0)->as_Mem(); |
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278 if (same_velt_type(s, mem_ref)) { |
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279 remove_pack_at(i); |
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280 } |
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281 } |
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282 |
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283 // If needed find the best memory reference for loop alignment again. |
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284 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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285 // Put memory ops from remaining packs back on memops list for |
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286 // the best alignment search. |
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287 uint orig_msize = memops.size(); |
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288 for (int i = 0; i < _packset.length(); i++) { |
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289 Node_List* p = _packset.at(i); |
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290 MemNode* s = p->at(0)->as_Mem(); |
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291 assert(!same_velt_type(s, mem_ref), "sanity"); |
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292 memops.push(s); |
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293 } |
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294 MemNode* best_align_to_mem_ref = find_align_to_ref(memops); |
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295 if (best_align_to_mem_ref == NULL) break; |
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296 best_iv_adjustment = get_iv_adjustment(best_align_to_mem_ref); |
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297 // Restore list. |
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298 while (memops.size() > orig_msize) |
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299 (void)memops.pop(); |
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300 } |
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301 } // unaligned memory accesses |
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302 |
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303 // Remove used mem nodes. |
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304 for (int i = memops.size() - 1; i >= 0; i--) { |
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305 MemNode* m = memops.at(i)->as_Mem(); |
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306 if (alignment(m) != top_align) { |
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307 memops.remove(i); |
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308 } |
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309 } |
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310 |
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311 } // while (memops.size() != 0 |
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312 set_align_to_ref(best_align_to_mem_ref); |
0 | 313 |
314 #ifndef PRODUCT | |
315 if (TraceSuperWord) { | |
316 tty->print_cr("\nAfter find_adjacent_refs"); | |
317 print_packset(); | |
318 } | |
319 #endif | |
320 } | |
321 | |
322 //------------------------------find_align_to_ref--------------------------- | |
323 // Find a memory reference to align the loop induction variable to. | |
324 // Looks first at stores then at loads, looking for a memory reference | |
325 // with the largest number of references similar to it. | |
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326 MemNode* SuperWord::find_align_to_ref(Node_List &memops) { |
0 | 327 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); |
328 | |
329 // Count number of comparable memory ops | |
330 for (uint i = 0; i < memops.size(); i++) { | |
331 MemNode* s1 = memops.at(i)->as_Mem(); | |
332 SWPointer p1(s1, this); | |
333 // Discard if pre loop can't align this reference | |
334 if (!ref_is_alignable(p1)) { | |
335 *cmp_ct.adr_at(i) = 0; | |
336 continue; | |
337 } | |
338 for (uint j = i+1; j < memops.size(); j++) { | |
339 MemNode* s2 = memops.at(j)->as_Mem(); | |
340 if (isomorphic(s1, s2)) { | |
341 SWPointer p2(s2, this); | |
342 if (p1.comparable(p2)) { | |
343 (*cmp_ct.adr_at(i))++; | |
344 (*cmp_ct.adr_at(j))++; | |
345 } | |
346 } | |
347 } | |
348 } | |
349 | |
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350 // Find Store (or Load) with the greatest number of "comparable" references, |
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351 // biggest vector size, smallest data size and smallest iv offset. |
0 | 352 int max_ct = 0; |
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353 int max_vw = 0; |
0 | 354 int max_idx = -1; |
355 int min_size = max_jint; | |
356 int min_iv_offset = max_jint; | |
357 for (uint j = 0; j < memops.size(); j++) { | |
358 MemNode* s = memops.at(j)->as_Mem(); | |
359 if (s->is_Store()) { | |
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360 int vw = vector_width_in_bytes(velt_basic_type(s)); |
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361 assert(vw > 1, "sanity"); |
0 | 362 SWPointer p(s, this); |
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363 if (cmp_ct.at(j) > max_ct || |
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364 cmp_ct.at(j) == max_ct && |
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365 (vw > max_vw || |
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366 vw == max_vw && |
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367 (data_size(s) < min_size || |
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368 data_size(s) == min_size && |
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369 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 370 max_ct = cmp_ct.at(j); |
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371 max_vw = vw; |
0 | 372 max_idx = j; |
373 min_size = data_size(s); | |
374 min_iv_offset = p.offset_in_bytes(); | |
375 } | |
376 } | |
377 } | |
378 // If no stores, look at loads | |
379 if (max_ct == 0) { | |
380 for (uint j = 0; j < memops.size(); j++) { | |
381 MemNode* s = memops.at(j)->as_Mem(); | |
382 if (s->is_Load()) { | |
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383 int vw = vector_width_in_bytes(velt_basic_type(s)); |
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384 assert(vw > 1, "sanity"); |
0 | 385 SWPointer p(s, this); |
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386 if (cmp_ct.at(j) > max_ct || |
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387 cmp_ct.at(j) == max_ct && |
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388 (vw > max_vw || |
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389 vw == max_vw && |
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390 (data_size(s) < min_size || |
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391 data_size(s) == min_size && |
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392 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 393 max_ct = cmp_ct.at(j); |
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394 max_vw = vw; |
0 | 395 max_idx = j; |
396 min_size = data_size(s); | |
397 min_iv_offset = p.offset_in_bytes(); | |
398 } | |
399 } | |
400 } | |
401 } | |
402 | |
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403 #ifdef ASSERT |
0 | 404 if (TraceSuperWord && Verbose) { |
405 tty->print_cr("\nVector memops after find_align_to_refs"); | |
406 for (uint i = 0; i < memops.size(); i++) { | |
407 MemNode* s = memops.at(i)->as_Mem(); | |
408 s->dump(); | |
409 } | |
410 } | |
411 #endif | |
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412 |
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413 if (max_ct > 0) { |
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414 #ifdef ASSERT |
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415 if (TraceSuperWord) { |
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416 tty->print("\nVector align to node: "); |
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417 memops.at(max_idx)->as_Mem()->dump(); |
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418 } |
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419 #endif |
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420 return memops.at(max_idx)->as_Mem(); |
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421 } |
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422 return NULL; |
0 | 423 } |
424 | |
425 //------------------------------ref_is_alignable--------------------------- | |
426 // Can the preloop align the reference to position zero in the vector? | |
427 bool SuperWord::ref_is_alignable(SWPointer& p) { | |
428 if (!p.has_iv()) { | |
429 return true; // no induction variable | |
430 } | |
431 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); | |
432 assert(pre_end->stride_is_con(), "pre loop stride is constant"); | |
433 int preloop_stride = pre_end->stride_con(); | |
434 | |
435 int span = preloop_stride * p.scale_in_bytes(); | |
436 | |
437 // Stride one accesses are alignable. | |
438 if (ABS(span) == p.memory_size()) | |
439 return true; | |
440 | |
441 // If initial offset from start of object is computable, | |
442 // compute alignment within the vector. | |
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443 BasicType bt = velt_basic_type(p.mem()); |
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444 int vw = vector_width_in_bytes(bt); |
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445 assert(vw > 1, "sanity"); |
0 | 446 if (vw % span == 0) { |
447 Node* init_nd = pre_end->init_trip(); | |
448 if (init_nd->is_Con() && p.invar() == NULL) { | |
449 int init = init_nd->bottom_type()->is_int()->get_con(); | |
450 | |
451 int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes(); | |
452 assert(init_offset >= 0, "positive offset from object start"); | |
453 | |
454 if (span > 0) { | |
455 return (vw - (init_offset % vw)) % span == 0; | |
456 } else { | |
457 assert(span < 0, "nonzero stride * scale"); | |
458 return (init_offset % vw) % -span == 0; | |
459 } | |
460 } | |
461 } | |
462 return false; | |
463 } | |
464 | |
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465 //---------------------------get_iv_adjustment--------------------------- |
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466 // Calculate loop's iv adjustment for this memory ops. |
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467 int SuperWord::get_iv_adjustment(MemNode* mem_ref) { |
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468 SWPointer align_to_ref_p(mem_ref, this); |
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469 int offset = align_to_ref_p.offset_in_bytes(); |
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470 int scale = align_to_ref_p.scale_in_bytes(); |
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471 BasicType bt = velt_basic_type(mem_ref); |
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472 int vw = vector_width_in_bytes(bt); |
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473 assert(vw > 1, "sanity"); |
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474 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; |
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475 int iv_adjustment = (stride_sign * vw - (offset % vw)) % vw; |
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476 |
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477 #ifndef PRODUCT |
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478 if (TraceSuperWord) |
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479 tty->print_cr("\noffset = %d iv_adjust = %d elt_size = %d scale = %d iv_stride = %d vect_size %d", |
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480 offset, iv_adjustment, align_to_ref_p.memory_size(), scale, iv_stride(), vw); |
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481 #endif |
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482 return iv_adjustment; |
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483 } |
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484 |
0 | 485 //---------------------------dependence_graph--------------------------- |
486 // Construct dependency graph. | |
487 // Add dependence edges to load/store nodes for memory dependence | |
488 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) | |
489 void SuperWord::dependence_graph() { | |
490 // First, assign a dependence node to each memory node | |
491 for (int i = 0; i < _block.length(); i++ ) { | |
492 Node *n = _block.at(i); | |
493 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { | |
494 _dg.make_node(n); | |
495 } | |
496 } | |
497 | |
498 // For each memory slice, create the dependences | |
499 for (int i = 0; i < _mem_slice_head.length(); i++) { | |
500 Node* n = _mem_slice_head.at(i); | |
501 Node* n_tail = _mem_slice_tail.at(i); | |
502 | |
503 // Get slice in predecessor order (last is first) | |
504 mem_slice_preds(n_tail, n, _nlist); | |
505 | |
506 // Make the slice dependent on the root | |
507 DepMem* slice = _dg.dep(n); | |
508 _dg.make_edge(_dg.root(), slice); | |
509 | |
510 // Create a sink for the slice | |
511 DepMem* slice_sink = _dg.make_node(NULL); | |
512 _dg.make_edge(slice_sink, _dg.tail()); | |
513 | |
514 // Now visit each pair of memory ops, creating the edges | |
515 for (int j = _nlist.length() - 1; j >= 0 ; j--) { | |
516 Node* s1 = _nlist.at(j); | |
517 | |
518 // If no dependency yet, use slice | |
519 if (_dg.dep(s1)->in_cnt() == 0) { | |
520 _dg.make_edge(slice, s1); | |
521 } | |
522 SWPointer p1(s1->as_Mem(), this); | |
523 bool sink_dependent = true; | |
524 for (int k = j - 1; k >= 0; k--) { | |
525 Node* s2 = _nlist.at(k); | |
526 if (s1->is_Load() && s2->is_Load()) | |
527 continue; | |
528 SWPointer p2(s2->as_Mem(), this); | |
529 | |
530 int cmp = p1.cmp(p2); | |
531 if (SuperWordRTDepCheck && | |
532 p1.base() != p2.base() && p1.valid() && p2.valid()) { | |
533 // Create a runtime check to disambiguate | |
534 OrderedPair pp(p1.base(), p2.base()); | |
535 _disjoint_ptrs.append_if_missing(pp); | |
536 } else if (!SWPointer::not_equal(cmp)) { | |
537 // Possibly same address | |
538 _dg.make_edge(s1, s2); | |
539 sink_dependent = false; | |
540 } | |
541 } | |
542 if (sink_dependent) { | |
543 _dg.make_edge(s1, slice_sink); | |
544 } | |
545 } | |
546 #ifndef PRODUCT | |
547 if (TraceSuperWord) { | |
548 tty->print_cr("\nDependence graph for slice: %d", n->_idx); | |
549 for (int q = 0; q < _nlist.length(); q++) { | |
550 _dg.print(_nlist.at(q)); | |
551 } | |
552 tty->cr(); | |
553 } | |
554 #endif | |
555 _nlist.clear(); | |
556 } | |
557 | |
558 #ifndef PRODUCT | |
559 if (TraceSuperWord) { | |
560 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); | |
561 for (int r = 0; r < _disjoint_ptrs.length(); r++) { | |
562 _disjoint_ptrs.at(r).print(); | |
563 tty->cr(); | |
564 } | |
565 tty->cr(); | |
566 } | |
567 #endif | |
568 } | |
569 | |
570 //---------------------------mem_slice_preds--------------------------- | |
571 // Return a memory slice (node list) in predecessor order starting at "start" | |
572 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { | |
573 assert(preds.length() == 0, "start empty"); | |
574 Node* n = start; | |
575 Node* prev = NULL; | |
576 while (true) { | |
577 assert(in_bb(n), "must be in block"); | |
578 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
579 Node* out = n->fast_out(i); | |
580 if (out->is_Load()) { | |
581 if (in_bb(out)) { | |
582 preds.push(out); | |
583 } | |
584 } else { | |
585 // FIXME | |
586 if (out->is_MergeMem() && !in_bb(out)) { | |
587 // Either unrolling is causing a memory edge not to disappear, | |
588 // or need to run igvn.optimize() again before SLP | |
589 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { | |
590 // Ditto. Not sure what else to check further. | |
667 | 591 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { |
0 | 592 // StoreCM has an input edge used as a precedence edge. |
593 // Maybe an issue when oop stores are vectorized. | |
594 } else { | |
595 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
596 } | |
597 } | |
598 } | |
599 if (n == stop) break; | |
600 preds.push(n); | |
601 prev = n; | |
602 n = n->in(MemNode::Memory); | |
603 } | |
604 } | |
605 | |
606 //------------------------------stmts_can_pack--------------------------- | |
605 | 607 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and |
0 | 608 // s1 aligned at "align" |
609 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
987
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610 |
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611 // Do not use superword for non-primitives |
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612 BasicType bt1 = velt_basic_type(s1); |
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613 BasicType bt2 = velt_basic_type(s2); |
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614 if(!is_java_primitive(bt1) || !is_java_primitive(bt2)) |
987
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615 return false; |
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616 if (Matcher::max_vector_size(bt1) < 2) { |
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617 return false; // No vectors for this type |
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618 } |
987
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619 |
0 | 620 if (isomorphic(s1, s2)) { |
621 if (independent(s1, s2)) { | |
622 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
623 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
624 int s1_align = alignment(s1); | |
625 int s2_align = alignment(s2); | |
626 if (s1_align == top_align || s1_align == align) { | |
627 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
628 return true; | |
629 } | |
630 } | |
631 } | |
632 } | |
633 } | |
634 } | |
635 return false; | |
636 } | |
637 | |
638 //------------------------------exists_at--------------------------- | |
639 // Does s exist in a pack at position pos? | |
640 bool SuperWord::exists_at(Node* s, uint pos) { | |
641 for (int i = 0; i < _packset.length(); i++) { | |
642 Node_List* p = _packset.at(i); | |
643 if (p->at(pos) == s) { | |
644 return true; | |
645 } | |
646 } | |
647 return false; | |
648 } | |
649 | |
650 //------------------------------are_adjacent_refs--------------------------- | |
651 // Is s1 immediately before s2 in memory? | |
652 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
653 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
654 if (!in_bb(s1) || !in_bb(s2)) return false; | |
1585 | 655 |
656 // Do not use superword for non-primitives | |
657 if (!is_java_primitive(s1->as_Mem()->memory_type()) || | |
658 !is_java_primitive(s2->as_Mem()->memory_type())) { | |
659 return false; | |
660 } | |
661 | |
0 | 662 // FIXME - co_locate_pack fails on Stores in different mem-slices, so |
663 // only pack memops that are in the same alias set until that's fixed. | |
664 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
665 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
666 return false; | |
667 SWPointer p1(s1->as_Mem(), this); | |
668 SWPointer p2(s2->as_Mem(), this); | |
669 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
670 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
671 return diff == data_size(s1); | |
672 } | |
673 | |
674 //------------------------------isomorphic--------------------------- | |
675 // Are s1 and s2 similar? | |
676 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
677 if (s1->Opcode() != s2->Opcode()) return false; | |
678 if (s1->req() != s2->req()) return false; | |
679 if (s1->in(0) != s2->in(0)) return false; | |
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680 if (!same_velt_type(s1, s2)) return false; |
0 | 681 return true; |
682 } | |
683 | |
684 //------------------------------independent--------------------------- | |
685 // Is there no data path from s1 to s2 or s2 to s1? | |
686 bool SuperWord::independent(Node* s1, Node* s2) { | |
687 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
688 int d1 = depth(s1); | |
689 int d2 = depth(s2); | |
690 if (d1 == d2) return s1 != s2; | |
691 Node* deep = d1 > d2 ? s1 : s2; | |
692 Node* shallow = d1 > d2 ? s2 : s1; | |
693 | |
694 visited_clear(); | |
695 | |
696 return independent_path(shallow, deep); | |
697 } | |
698 | |
699 //------------------------------independent_path------------------------------ | |
700 // Helper for independent | |
701 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
702 if (dp >= 1000) return false; // stop deep recursion | |
703 visited_set(deep); | |
704 int shal_depth = depth(shallow); | |
705 assert(shal_depth <= depth(deep), "must be"); | |
706 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
707 Node* pred = preds.current(); | |
708 if (in_bb(pred) && !visited_test(pred)) { | |
709 if (shallow == pred) { | |
710 return false; | |
711 } | |
712 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
713 return false; | |
714 } | |
715 } | |
716 } | |
717 return true; | |
718 } | |
719 | |
720 //------------------------------set_alignment--------------------------- | |
721 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
722 set_alignment(s1, align); | |
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723 if (align == top_align || align == bottom_align) { |
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724 set_alignment(s2, align); |
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725 } else { |
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726 set_alignment(s2, align + data_size(s1)); |
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727 } |
0 | 728 } |
729 | |
730 //------------------------------data_size--------------------------- | |
731 int SuperWord::data_size(Node* s) { | |
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732 int bsize = type2aelembytes(velt_basic_type(s)); |
0 | 733 assert(bsize != 0, "valid size"); |
734 return bsize; | |
735 } | |
736 | |
737 //------------------------------extend_packlist--------------------------- | |
738 // Extend packset by following use->def and def->use links from pack members. | |
739 void SuperWord::extend_packlist() { | |
740 bool changed; | |
741 do { | |
742 changed = false; | |
743 for (int i = 0; i < _packset.length(); i++) { | |
744 Node_List* p = _packset.at(i); | |
745 changed |= follow_use_defs(p); | |
746 changed |= follow_def_uses(p); | |
747 } | |
748 } while (changed); | |
749 | |
750 #ifndef PRODUCT | |
751 if (TraceSuperWord) { | |
752 tty->print_cr("\nAfter extend_packlist"); | |
753 print_packset(); | |
754 } | |
755 #endif | |
756 } | |
757 | |
758 //------------------------------follow_use_defs--------------------------- | |
759 // Extend the packset by visiting operand definitions of nodes in pack p | |
760 bool SuperWord::follow_use_defs(Node_List* p) { | |
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761 assert(p->size() == 2, "just checking"); |
0 | 762 Node* s1 = p->at(0); |
763 Node* s2 = p->at(1); | |
764 assert(s1->req() == s2->req(), "just checking"); | |
765 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
766 | |
767 if (s1->is_Load()) return false; | |
768 | |
769 int align = alignment(s1); | |
770 bool changed = false; | |
771 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
772 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
773 for (int j = start; j < end; j++) { | |
774 Node* t1 = s1->in(j); | |
775 Node* t2 = s2->in(j); | |
776 if (!in_bb(t1) || !in_bb(t2)) | |
777 continue; | |
778 if (stmts_can_pack(t1, t2, align)) { | |
779 if (est_savings(t1, t2) >= 0) { | |
780 Node_List* pair = new Node_List(); | |
781 pair->push(t1); | |
782 pair->push(t2); | |
783 _packset.append(pair); | |
784 set_alignment(t1, t2, align); | |
785 changed = true; | |
786 } | |
787 } | |
788 } | |
789 return changed; | |
790 } | |
791 | |
792 //------------------------------follow_def_uses--------------------------- | |
793 // Extend the packset by visiting uses of nodes in pack p | |
794 bool SuperWord::follow_def_uses(Node_List* p) { | |
795 bool changed = false; | |
796 Node* s1 = p->at(0); | |
797 Node* s2 = p->at(1); | |
798 assert(p->size() == 2, "just checking"); | |
799 assert(s1->req() == s2->req(), "just checking"); | |
800 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
801 | |
802 if (s1->is_Store()) return false; | |
803 | |
804 int align = alignment(s1); | |
805 int savings = -1; | |
806 Node* u1 = NULL; | |
807 Node* u2 = NULL; | |
808 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
809 Node* t1 = s1->fast_out(i); | |
810 if (!in_bb(t1)) continue; | |
811 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
812 Node* t2 = s2->fast_out(j); | |
813 if (!in_bb(t2)) continue; | |
814 if (!opnd_positions_match(s1, t1, s2, t2)) | |
815 continue; | |
816 if (stmts_can_pack(t1, t2, align)) { | |
817 int my_savings = est_savings(t1, t2); | |
818 if (my_savings > savings) { | |
819 savings = my_savings; | |
820 u1 = t1; | |
821 u2 = t2; | |
822 } | |
823 } | |
824 } | |
825 } | |
826 if (savings >= 0) { | |
827 Node_List* pair = new Node_List(); | |
828 pair->push(u1); | |
829 pair->push(u2); | |
830 _packset.append(pair); | |
831 set_alignment(u1, u2, align); | |
832 changed = true; | |
833 } | |
834 return changed; | |
835 } | |
836 | |
837 //---------------------------opnd_positions_match------------------------- | |
838 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
839 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
840 uint ct = u1->req(); | |
841 if (ct != u2->req()) return false; | |
842 uint i1 = 0; | |
843 uint i2 = 0; | |
844 do { | |
845 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
846 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
847 if (i1 != i2) { | |
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848 if ((i1 == (3-i2)) && (u2->is_Add() || u2->is_Mul())) { |
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849 // Further analysis relies on operands position matching. |
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850 u2->swap_edges(i1, i2); |
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851 } else { |
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852 return false; |
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853 } |
0 | 854 } |
855 } while (i1 < ct); | |
856 return true; | |
857 } | |
858 | |
859 //------------------------------est_savings--------------------------- | |
860 // Estimate the savings from executing s1 and s2 as a pack | |
861 int SuperWord::est_savings(Node* s1, Node* s2) { | |
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862 int save_in = 2 - 1; // 2 operations per instruction in packed form |
0 | 863 |
864 // inputs | |
865 for (uint i = 1; i < s1->req(); i++) { | |
866 Node* x1 = s1->in(i); | |
867 Node* x2 = s2->in(i); | |
868 if (x1 != x2) { | |
869 if (are_adjacent_refs(x1, x2)) { | |
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870 save_in += adjacent_profit(x1, x2); |
0 | 871 } else if (!in_packset(x1, x2)) { |
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872 save_in -= pack_cost(2); |
0 | 873 } else { |
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874 save_in += unpack_cost(2); |
0 | 875 } |
876 } | |
877 } | |
878 | |
879 // uses of result | |
880 uint ct = 0; | |
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881 int save_use = 0; |
0 | 882 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { |
883 Node* s1_use = s1->fast_out(i); | |
884 for (int j = 0; j < _packset.length(); j++) { | |
885 Node_List* p = _packset.at(j); | |
886 if (p->at(0) == s1_use) { | |
887 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
888 Node* s2_use = s2->fast_out(k); | |
889 if (p->at(p->size()-1) == s2_use) { | |
890 ct++; | |
891 if (are_adjacent_refs(s1_use, s2_use)) { | |
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892 save_use += adjacent_profit(s1_use, s2_use); |
0 | 893 } |
894 } | |
895 } | |
896 } | |
897 } | |
898 } | |
899 | |
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900 if (ct < s1->outcnt()) save_use += unpack_cost(1); |
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901 if (ct < s2->outcnt()) save_use += unpack_cost(1); |
0 | 902 |
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903 return MAX2(save_in, save_use); |
0 | 904 } |
905 | |
906 //------------------------------costs--------------------------- | |
907 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
908 int SuperWord::pack_cost(int ct) { return ct; } | |
909 int SuperWord::unpack_cost(int ct) { return ct; } | |
910 | |
911 //------------------------------combine_packs--------------------------- | |
912 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
913 void SuperWord::combine_packs() { | |
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914 bool changed = true; |
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915 // Combine packs regardless max vector size. |
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916 while (changed) { |
0 | 917 changed = false; |
918 for (int i = 0; i < _packset.length(); i++) { | |
919 Node_List* p1 = _packset.at(i); | |
920 if (p1 == NULL) continue; | |
921 for (int j = 0; j < _packset.length(); j++) { | |
922 Node_List* p2 = _packset.at(j); | |
923 if (p2 == NULL) continue; | |
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924 if (i == j) continue; |
0 | 925 if (p1->at(p1->size()-1) == p2->at(0)) { |
926 for (uint k = 1; k < p2->size(); k++) { | |
927 p1->push(p2->at(k)); | |
928 } | |
929 _packset.at_put(j, NULL); | |
930 changed = true; | |
931 } | |
932 } | |
933 } | |
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934 } |
0 | 935 |
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936 // Split packs which have size greater then max vector size. |
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937 for (int i = 0; i < _packset.length(); i++) { |
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938 Node_List* p1 = _packset.at(i); |
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939 if (p1 != NULL) { |
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940 BasicType bt = velt_basic_type(p1->at(0)); |
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941 uint max_vlen = Matcher::max_vector_size(bt); // Max elements in vector |
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942 assert(is_power_of_2(max_vlen), "sanity"); |
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943 uint psize = p1->size(); |
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944 if (!is_power_of_2(psize)) { |
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945 // Skip pack which can't be vector. |
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946 // case1: for(...) { a[i] = i; } elements values are different (i+x) |
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947 // case2: for(...) { a[i] = b[i+1]; } can't align both, load and store |
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948 _packset.at_put(i, NULL); |
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949 continue; |
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950 } |
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951 if (psize > max_vlen) { |
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952 Node_List* pack = new Node_List(); |
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953 for (uint j = 0; j < psize; j++) { |
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954 pack->push(p1->at(j)); |
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955 if (pack->size() >= max_vlen) { |
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956 assert(is_power_of_2(pack->size()), "sanity"); |
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957 _packset.append(pack); |
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958 pack = new Node_List(); |
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959 } |
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960 } |
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961 _packset.at_put(i, NULL); |
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962 } |
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963 } |
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964 } |
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965 |
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966 // Compress list. |
0 | 967 for (int i = _packset.length() - 1; i >= 0; i--) { |
968 Node_List* p1 = _packset.at(i); | |
969 if (p1 == NULL) { | |
970 _packset.remove_at(i); | |
971 } | |
972 } | |
973 | |
974 #ifndef PRODUCT | |
975 if (TraceSuperWord) { | |
976 tty->print_cr("\nAfter combine_packs"); | |
977 print_packset(); | |
978 } | |
979 #endif | |
980 } | |
981 | |
982 //-----------------------------construct_my_pack_map-------------------------- | |
983 // Construct the map from nodes to packs. Only valid after the | |
984 // point where a node is only in one pack (after combine_packs). | |
985 void SuperWord::construct_my_pack_map() { | |
986 Node_List* rslt = NULL; | |
987 for (int i = 0; i < _packset.length(); i++) { | |
988 Node_List* p = _packset.at(i); | |
989 for (uint j = 0; j < p->size(); j++) { | |
990 Node* s = p->at(j); | |
991 assert(my_pack(s) == NULL, "only in one pack"); | |
992 set_my_pack(s, p); | |
993 } | |
994 } | |
995 } | |
996 | |
997 //------------------------------filter_packs--------------------------- | |
998 // Remove packs that are not implemented or not profitable. | |
999 void SuperWord::filter_packs() { | |
1000 | |
1001 // Remove packs that are not implemented | |
1002 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1003 Node_List* pk = _packset.at(i); | |
1004 bool impl = implemented(pk); | |
1005 if (!impl) { | |
1006 #ifndef PRODUCT | |
1007 if (TraceSuperWord && Verbose) { | |
1008 tty->print_cr("Unimplemented"); | |
1009 pk->at(0)->dump(); | |
1010 } | |
1011 #endif | |
1012 remove_pack_at(i); | |
1013 } | |
1014 } | |
1015 | |
1016 // Remove packs that are not profitable | |
1017 bool changed; | |
1018 do { | |
1019 changed = false; | |
1020 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1021 Node_List* pk = _packset.at(i); | |
1022 bool prof = profitable(pk); | |
1023 if (!prof) { | |
1024 #ifndef PRODUCT | |
1025 if (TraceSuperWord && Verbose) { | |
1026 tty->print_cr("Unprofitable"); | |
1027 pk->at(0)->dump(); | |
1028 } | |
1029 #endif | |
1030 remove_pack_at(i); | |
1031 changed = true; | |
1032 } | |
1033 } | |
1034 } while (changed); | |
1035 | |
1036 #ifndef PRODUCT | |
1037 if (TraceSuperWord) { | |
1038 tty->print_cr("\nAfter filter_packs"); | |
1039 print_packset(); | |
1040 tty->cr(); | |
1041 } | |
1042 #endif | |
1043 } | |
1044 | |
1045 //------------------------------implemented--------------------------- | |
1046 // Can code be generated for pack p? | |
1047 bool SuperWord::implemented(Node_List* p) { | |
1048 Node* p0 = p->at(0); | |
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1049 return VectorNode::implemented(p0->Opcode(), p->size(), velt_basic_type(p0)); |
0 | 1050 } |
1051 | |
1052 //------------------------------profitable--------------------------- | |
1053 // For pack p, are all operands and all uses (with in the block) vector? | |
1054 bool SuperWord::profitable(Node_List* p) { | |
1055 Node* p0 = p->at(0); | |
1056 uint start, end; | |
1057 vector_opd_range(p0, &start, &end); | |
1058 | |
1059 // Return false if some input is not vector and inside block | |
1060 for (uint i = start; i < end; i++) { | |
1061 if (!is_vector_use(p0, i)) { | |
1062 // For now, return false if not scalar promotion case (inputs are the same.) | |
605 | 1063 // Later, implement PackNode and allow differing, non-vector inputs |
0 | 1064 // (maybe just the ones from outside the block.) |
1065 Node* p0_def = p0->in(i); | |
1066 for (uint j = 1; j < p->size(); j++) { | |
1067 Node* use = p->at(j); | |
1068 Node* def = use->in(i); | |
1069 if (p0_def != def) | |
1070 return false; | |
1071 } | |
1072 } | |
1073 } | |
1074 if (!p0->is_Store()) { | |
1075 // For now, return false if not all uses are vector. | |
1076 // Later, implement ExtractNode and allow non-vector uses (maybe | |
1077 // just the ones outside the block.) | |
1078 for (uint i = 0; i < p->size(); i++) { | |
1079 Node* def = p->at(i); | |
1080 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1081 Node* use = def->fast_out(j); | |
1082 for (uint k = 0; k < use->req(); k++) { | |
1083 Node* n = use->in(k); | |
1084 if (def == n) { | |
1085 if (!is_vector_use(use, k)) { | |
1086 return false; | |
1087 } | |
1088 } | |
1089 } | |
1090 } | |
1091 } | |
1092 } | |
1093 return true; | |
1094 } | |
1095 | |
1096 //------------------------------schedule--------------------------- | |
1097 // Adjust the memory graph for the packed operations | |
1098 void SuperWord::schedule() { | |
1099 | |
1100 // Co-locate in the memory graph the members of each memory pack | |
1101 for (int i = 0; i < _packset.length(); i++) { | |
1102 co_locate_pack(_packset.at(i)); | |
1103 } | |
1104 } | |
1105 | |
667 | 1106 //-------------------------------remove_and_insert------------------- |
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1107 // Remove "current" from its current position in the memory graph and insert |
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1108 // it after the appropriate insertion point (lip or uip). |
667 | 1109 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, |
1110 Node *uip, Unique_Node_List &sched_before) { | |
1111 Node* my_mem = current->in(MemNode::Memory); | |
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1112 bool sched_up = sched_before.member(current); |
667 | 1113 |
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1114 // remove current_store from its current position in the memmory graph |
667 | 1115 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1116 Node* use = current->out(i); | |
1117 if (use->is_Mem()) { | |
1118 assert(use->in(MemNode::Memory) == current, "must be"); | |
1119 if (use == prev) { // connect prev to my_mem | |
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1120 _igvn.replace_input_of(use, MemNode::Memory, my_mem); |
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1121 --i; //deleted this edge; rescan position |
667 | 1122 } else if (sched_before.member(use)) { |
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1123 if (!sched_up) { // Will be moved together with current |
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1124 _igvn.replace_input_of(use, MemNode::Memory, uip); |
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1125 --i; //deleted this edge; rescan position |
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1126 } |
667 | 1127 } else { |
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1128 if (sched_up) { // Will be moved together with current |
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1129 _igvn.replace_input_of(use, MemNode::Memory, lip); |
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1130 --i; //deleted this edge; rescan position |
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1131 } |
667 | 1132 } |
1133 } | |
1134 } | |
1135 | |
1136 Node *insert_pt = sched_up ? uip : lip; | |
1137 | |
1138 // all uses of insert_pt's memory state should use current's instead | |
1139 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { | |
1140 Node* use = insert_pt->out(i); | |
1141 if (use->is_Mem()) { | |
1142 assert(use->in(MemNode::Memory) == insert_pt, "must be"); | |
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1143 _igvn.replace_input_of(use, MemNode::Memory, current); |
667 | 1144 --i; //deleted this edge; rescan position |
1145 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { | |
1146 uint pos; //lip (lower insert point) must be the last one in the memory slice | |
1147 for (pos=1; pos < use->req(); pos++) { | |
1148 if (use->in(pos) == insert_pt) break; | |
1149 } | |
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1150 _igvn.replace_input_of(use, pos, current); |
667 | 1151 --i; |
1152 } | |
1153 } | |
1154 | |
1155 //connect current to insert_pt | |
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1156 _igvn.replace_input_of(current, MemNode::Memory, insert_pt); |
667 | 1157 } |
1158 | |
1159 //------------------------------co_locate_pack---------------------------------- | |
1160 // To schedule a store pack, we need to move any sandwiched memory ops either before | |
1161 // or after the pack, based upon dependence information: | |
1162 // (1) If any store in the pack depends on the sandwiched memory op, the | |
1163 // sandwiched memory op must be scheduled BEFORE the pack; | |
1164 // (2) If a sandwiched memory op depends on any store in the pack, the | |
1165 // sandwiched memory op must be scheduled AFTER the pack; | |
1166 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched | |
1167 // memory op (say memB), memB must be scheduled before memA. So, if memA is | |
1168 // scheduled before the pack, memB must also be scheduled before the pack; | |
1169 // (4) If there is no dependence restriction for a sandwiched memory op, we simply | |
1170 // schedule this store AFTER the pack | |
1171 // (5) We know there is no dependence cycle, so there in no other case; | |
1172 // (6) Finally, all memory ops in another single pack should be moved in the same direction. | |
1173 // | |
952 | 1174 // To schedule a load pack, we use the memory state of either the first or the last load in |
1175 // the pack, based on the dependence constraint. | |
0 | 1176 void SuperWord::co_locate_pack(Node_List* pk) { |
1177 if (pk->at(0)->is_Store()) { | |
1178 MemNode* first = executed_first(pk)->as_Mem(); | |
1179 MemNode* last = executed_last(pk)->as_Mem(); | |
667 | 1180 Unique_Node_List schedule_before_pack; |
1181 Unique_Node_List memops; | |
1182 | |
0 | 1183 MemNode* current = last->in(MemNode::Memory)->as_Mem(); |
667 | 1184 MemNode* previous = last; |
0 | 1185 while (true) { |
1186 assert(in_bb(current), "stay in block"); | |
667 | 1187 memops.push(previous); |
1188 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1189 Node* use = current->out(i); | |
1190 if (use->is_Mem() && use != previous) | |
1191 memops.push(use); | |
1192 } | |
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1193 if (current == first) break; |
667 | 1194 previous = current; |
1195 current = current->in(MemNode::Memory)->as_Mem(); | |
1196 } | |
1197 | |
1198 // determine which memory operations should be scheduled before the pack | |
1199 for (uint i = 1; i < memops.size(); i++) { | |
1200 Node *s1 = memops.at(i); | |
1201 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { | |
1202 for (uint j = 0; j< i; j++) { | |
1203 Node *s2 = memops.at(j); | |
1204 if (!independent(s1, s2)) { | |
1205 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { | |
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1206 schedule_before_pack.push(s1); // s1 must be scheduled before |
667 | 1207 Node_List* mem_pk = my_pack(s1); |
1208 if (mem_pk != NULL) { | |
1209 for (uint ii = 0; ii < mem_pk->size(); ii++) { | |
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1210 Node* s = mem_pk->at(ii); // follow partner |
667 | 1211 if (memops.member(s) && !schedule_before_pack.member(s)) |
1212 schedule_before_pack.push(s); | |
1213 } | |
1214 } | |
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1215 break; |
667 | 1216 } |
1217 } | |
1218 } | |
1219 } | |
1220 } | |
1221 | |
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1222 Node* upper_insert_pt = first->in(MemNode::Memory); |
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1223 // Following code moves loads connected to upper_insert_pt below aliased stores. |
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1224 // Collect such loads here and reconnect them back to upper_insert_pt later. |
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1225 memops.clear(); |
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1226 for (DUIterator i = upper_insert_pt->outs(); upper_insert_pt->has_out(i); i++) { |
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1227 Node* use = upper_insert_pt->out(i); |
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1228 if (!use->is_Store()) |
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1229 memops.push(use); |
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1230 } |
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1231 |
667 | 1232 MemNode* lower_insert_pt = last; |
1233 previous = last; //previous store in pk | |
1234 current = last->in(MemNode::Memory)->as_Mem(); | |
1235 | |
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1236 // start scheduling from "last" to "first" |
667 | 1237 while (true) { |
1238 assert(in_bb(current), "stay in block"); | |
1239 assert(in_pack(previous, pk), "previous stays in pack"); | |
0 | 1240 Node* my_mem = current->in(MemNode::Memory); |
667 | 1241 |
0 | 1242 if (in_pack(current, pk)) { |
667 | 1243 // Forward users of my memory state (except "previous) to my input memory state |
0 | 1244 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1245 Node* use = current->out(i); | |
667 | 1246 if (use->is_Mem() && use != previous) { |
0 | 1247 assert(use->in(MemNode::Memory) == current, "must be"); |
667 | 1248 if (schedule_before_pack.member(use)) { |
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1249 _igvn.replace_input_of(use, MemNode::Memory, upper_insert_pt); |
667 | 1250 } else { |
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1251 _igvn.replace_input_of(use, MemNode::Memory, lower_insert_pt); |
667 | 1252 } |
0 | 1253 --i; // deleted this edge; rescan position |
1254 } | |
1255 } | |
667 | 1256 previous = current; |
1257 } else { // !in_pack(current, pk) ==> a sandwiched store | |
1258 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); | |
0 | 1259 } |
667 | 1260 |
0 | 1261 if (current == first) break; |
1262 current = my_mem->as_Mem(); | |
667 | 1263 } // end while |
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1264 |
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1265 // Reconnect loads back to upper_insert_pt. |
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1266 for (uint i = 0; i < memops.size(); i++) { |
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1267 Node *ld = memops.at(i); |
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1268 if (ld->in(MemNode::Memory) != upper_insert_pt) { |
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1269 _igvn.replace_input_of(ld, MemNode::Memory, upper_insert_pt); |
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1270 } |
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1271 } |
667 | 1272 } else if (pk->at(0)->is_Load()) { //load |
952 | 1273 // all loads in the pack should have the same memory state. By default, |
1274 // we use the memory state of the last load. However, if any load could | |
1275 // not be moved down due to the dependence constraint, we use the memory | |
1276 // state of the first load. | |
1277 Node* last_mem = executed_last(pk)->in(MemNode::Memory); | |
1278 Node* first_mem = executed_first(pk)->in(MemNode::Memory); | |
1279 bool schedule_last = true; | |
1280 for (uint i = 0; i < pk->size(); i++) { | |
1281 Node* ld = pk->at(i); | |
1282 for (Node* current = last_mem; current != ld->in(MemNode::Memory); | |
1283 current=current->in(MemNode::Memory)) { | |
1284 assert(current != first_mem, "corrupted memory graph"); | |
1285 if(current->is_Mem() && !independent(current, ld)){ | |
1286 schedule_last = false; // a later store depends on this load | |
1287 break; | |
1288 } | |
1289 } | |
1290 } | |
1291 | |
1292 Node* mem_input = schedule_last ? last_mem : first_mem; | |
1293 _igvn.hash_delete(mem_input); | |
1294 // Give each load the same memory state | |
0 | 1295 for (uint i = 0; i < pk->size(); i++) { |
1296 LoadNode* ld = pk->at(i)->as_Load(); | |
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1297 _igvn.replace_input_of(ld, MemNode::Memory, mem_input); |
0 | 1298 } |
1299 } | |
1300 } | |
1301 | |
1302 //------------------------------output--------------------------- | |
1303 // Convert packs into vector node operations | |
1304 void SuperWord::output() { | |
1305 if (_packset.length() == 0) return; | |
1306 | |
2445 | 1307 #ifndef PRODUCT |
1308 if (TraceLoopOpts) { | |
1309 tty->print("SuperWord "); | |
1310 lpt()->dump_head(); | |
1311 } | |
1312 #endif | |
1313 | |
0 | 1314 // MUST ENSURE main loop's initial value is properly aligned: |
1315 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
1316 | |
1317 align_initial_loop_index(align_to_ref()); | |
1318 | |
1319 // Insert extract (unpack) operations for scalar uses | |
1320 for (int i = 0; i < _packset.length(); i++) { | |
1321 insert_extracts(_packset.at(i)); | |
1322 } | |
1323 | |
1324 for (int i = 0; i < _block.length(); i++) { | |
1325 Node* n = _block.at(i); | |
1326 Node_List* p = my_pack(n); | |
1327 if (p && n == executed_last(p)) { | |
1328 uint vlen = p->size(); | |
1329 Node* vn = NULL; | |
1330 Node* low_adr = p->at(0); | |
1331 Node* first = executed_first(p); | |
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1332 int opc = n->Opcode(); |
0 | 1333 if (n->is_Load()) { |
1334 Node* ctl = n->in(MemNode::Control); | |
1335 Node* mem = first->in(MemNode::Memory); | |
1336 Node* adr = low_adr->in(MemNode::Address); | |
1337 const TypePtr* atyp = n->adr_type(); | |
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1338 vn = LoadVectorNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen, velt_basic_type(n)); |
0 | 1339 } else if (n->is_Store()) { |
1340 // Promote value to be stored to vector | |
3842 | 1341 Node* val = vector_opd(p, MemNode::ValueIn); |
0 | 1342 Node* ctl = n->in(MemNode::Control); |
1343 Node* mem = first->in(MemNode::Memory); | |
1344 Node* adr = low_adr->in(MemNode::Address); | |
1345 const TypePtr* atyp = n->adr_type(); | |
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1346 vn = StoreVectorNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); |
0 | 1347 } else if (n->req() == 3) { |
1348 // Promote operands to vector | |
1349 Node* in1 = vector_opd(p, 1); | |
1350 Node* in2 = vector_opd(p, 2); | |
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1351 vn = VectorNode::make(_phase->C, opc, in1, in2, vlen, velt_basic_type(n)); |
0 | 1352 } else { |
1353 ShouldNotReachHere(); | |
1354 } | |
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1355 assert(vn != NULL, "sanity"); |
0 | 1356 _phase->_igvn.register_new_node_with_optimizer(vn); |
1357 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); | |
1358 for (uint j = 0; j < p->size(); j++) { | |
1359 Node* pm = p->at(j); | |
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1360 _igvn.replace_node(pm, vn); |
0 | 1361 } |
1362 _igvn._worklist.push(vn); | |
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1363 #ifdef ASSERT |
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1364 if (TraceSuperWord) { |
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1365 tty->print("new Vector node: "); |
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1366 vn->dump(); |
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1367 } |
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1368 #endif |
0 | 1369 } |
1370 } | |
1371 } | |
1372 | |
1373 //------------------------------vector_opd--------------------------- | |
1374 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
3842 | 1375 Node* SuperWord::vector_opd(Node_List* p, int opd_idx) { |
0 | 1376 Node* p0 = p->at(0); |
1377 uint vlen = p->size(); | |
1378 Node* opd = p0->in(opd_idx); | |
1379 | |
1380 bool same_opd = true; | |
1381 for (uint i = 1; i < vlen; i++) { | |
1382 Node* pi = p->at(i); | |
1383 Node* in = pi->in(opd_idx); | |
1384 if (opd != in) { | |
1385 same_opd = false; | |
1386 break; | |
1387 } | |
1388 } | |
1389 | |
1390 if (same_opd) { | |
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1391 if (opd->is_Vector() || opd->is_LoadVector()) { |
3842 | 1392 return opd; // input is matching vector |
0 | 1393 } |
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1394 assert(!opd->is_StoreVector(), "such vector is not expected here"); |
6045 | 1395 // Convert scalar input to vector with the same number of elements as |
1396 // p0's vector. Use p0's type because size of operand's container in | |
1397 // vector should match p0's size regardless operand's size. | |
1398 const Type* p0_t = velt_type(p0); | |
1399 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, p0_t); | |
0 | 1400 |
1401 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1402 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); | |
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1403 #ifdef ASSERT |
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1404 if (TraceSuperWord) { |
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1405 tty->print("new Vector node: "); |
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1406 vn->dump(); |
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1407 } |
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1408 #endif |
0 | 1409 return vn; |
1410 } | |
1411 | |
1412 // Insert pack operation | |
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1413 BasicType bt = velt_basic_type(p0); |
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1414 PackNode* pk = PackNode::make(_phase->C, opd, vlen, bt); |
6045 | 1415 DEBUG_ONLY( const BasicType opd_bt = opd->bottom_type()->basic_type(); ) |
0 | 1416 |
1417 for (uint i = 1; i < vlen; i++) { | |
1418 Node* pi = p->at(i); | |
1419 Node* in = pi->in(opd_idx); | |
1420 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
6045 | 1421 assert(opd_bt == in->bottom_type()->basic_type(), "all same type"); |
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1422 pk->add_opd(i, in); |
0 | 1423 } |
1424 _phase->_igvn.register_new_node_with_optimizer(pk); | |
1425 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); | |
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1426 #ifdef ASSERT |
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1427 if (TraceSuperWord) { |
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1428 tty->print("new Pack node: "); |
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1429 pk->dump(); |
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1430 } |
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1431 #endif |
0 | 1432 return pk; |
1433 } | |
1434 | |
1435 //------------------------------insert_extracts--------------------------- | |
1436 // If a use of pack p is not a vector use, then replace the | |
1437 // use with an extract operation. | |
1438 void SuperWord::insert_extracts(Node_List* p) { | |
1439 if (p->at(0)->is_Store()) return; | |
1440 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1441 | |
1442 // Inspect each use of each pack member. For each use that is | |
1443 // not a vector use, replace the use with an extract operation. | |
1444 | |
1445 for (uint i = 0; i < p->size(); i++) { | |
1446 Node* def = p->at(i); | |
1447 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1448 Node* use = def->fast_out(j); | |
1449 for (uint k = 0; k < use->req(); k++) { | |
1450 Node* n = use->in(k); | |
1451 if (def == n) { | |
1452 if (!is_vector_use(use, k)) { | |
1453 _n_idx_list.push(use, k); | |
1454 } | |
1455 } | |
1456 } | |
1457 } | |
1458 } | |
1459 | |
1460 while (_n_idx_list.is_nonempty()) { | |
1461 Node* use = _n_idx_list.node(); | |
1462 int idx = _n_idx_list.index(); | |
1463 _n_idx_list.pop(); | |
1464 Node* def = use->in(idx); | |
1465 | |
1466 // Insert extract operation | |
1467 _igvn.hash_delete(def); | |
1468 int def_pos = alignment(def) / data_size(def); | |
1469 | |
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1470 Node* ex = ExtractNode::make(_phase->C, def, def_pos, velt_basic_type(def)); |
0 | 1471 _phase->_igvn.register_new_node_with_optimizer(ex); |
1472 _phase->set_ctrl(ex, _phase->get_ctrl(def)); | |
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1473 _igvn.replace_input_of(use, idx, ex); |
0 | 1474 _igvn._worklist.push(def); |
1475 | |
1476 bb_insert_after(ex, bb_idx(def)); | |
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1477 set_velt_type(ex, velt_type(def)); |
0 | 1478 } |
1479 } | |
1480 | |
1481 //------------------------------is_vector_use--------------------------- | |
1482 // Is use->in(u_idx) a vector use? | |
1483 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1484 Node_List* u_pk = my_pack(use); | |
1485 if (u_pk == NULL) return false; | |
1486 Node* def = use->in(u_idx); | |
1487 Node_List* d_pk = my_pack(def); | |
1488 if (d_pk == NULL) { | |
1489 // check for scalar promotion | |
1490 Node* n = u_pk->at(0)->in(u_idx); | |
1491 for (uint i = 1; i < u_pk->size(); i++) { | |
1492 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1493 } | |
1494 return true; | |
1495 } | |
1496 if (u_pk->size() != d_pk->size()) | |
1497 return false; | |
1498 for (uint i = 0; i < u_pk->size(); i++) { | |
1499 Node* ui = u_pk->at(i); | |
1500 Node* di = d_pk->at(i); | |
1501 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1502 return false; | |
1503 } | |
1504 return true; | |
1505 } | |
1506 | |
1507 //------------------------------construct_bb--------------------------- | |
1508 // Construct reverse postorder list of block members | |
1509 void SuperWord::construct_bb() { | |
1510 Node* entry = bb(); | |
1511 | |
1512 assert(_stk.length() == 0, "stk is empty"); | |
1513 assert(_block.length() == 0, "block is empty"); | |
1514 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1515 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1516 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1517 | |
1518 // Find non-control nodes with no inputs from within block, | |
1519 // create a temporary map from node _idx to bb_idx for use | |
1520 // by the visited and post_visited sets, | |
1521 // and count number of nodes in block. | |
1522 int bb_ct = 0; | |
1523 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1524 Node *n = lpt()->_body.at(i); | |
1525 set_bb_idx(n, i); // Create a temporary map | |
1526 if (in_bb(n)) { | |
1527 bb_ct++; | |
1528 if (!n->is_CFG()) { | |
1529 bool found = false; | |
1530 for (uint j = 0; j < n->req(); j++) { | |
1531 Node* def = n->in(j); | |
1532 if (def && in_bb(def)) { | |
1533 found = true; | |
1534 break; | |
1535 } | |
1536 } | |
1537 if (!found) { | |
1538 assert(n != entry, "can't be entry"); | |
1539 _data_entry.push(n); | |
1540 } | |
1541 } | |
1542 } | |
1543 } | |
1544 | |
1545 // Find memory slices (head and tail) | |
1546 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1547 Node *n = lp()->fast_out(i); | |
1548 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1549 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
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1550 if (n_tail != n->in(LoopNode::EntryControl)) { |
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1551 _mem_slice_head.push(n); |
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1552 _mem_slice_tail.push(n_tail); |
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1553 } |
0 | 1554 } |
1555 } | |
1556 | |
1557 // Create an RPO list of nodes in block | |
1558 | |
1559 visited_clear(); | |
1560 post_visited_clear(); | |
1561 | |
1562 // Push all non-control nodes with no inputs from within block, then control entry | |
1563 for (int j = 0; j < _data_entry.length(); j++) { | |
1564 Node* n = _data_entry.at(j); | |
1565 visited_set(n); | |
1566 _stk.push(n); | |
1567 } | |
1568 visited_set(entry); | |
1569 _stk.push(entry); | |
1570 | |
1571 // Do a depth first walk over out edges | |
1572 int rpo_idx = bb_ct - 1; | |
1573 int size; | |
1574 while ((size = _stk.length()) > 0) { | |
1575 Node* n = _stk.top(); // Leave node on stack | |
1576 if (!visited_test_set(n)) { | |
1577 // forward arc in graph | |
1578 } else if (!post_visited_test(n)) { | |
1579 // cross or back arc | |
1580 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1581 Node *use = n->fast_out(i); | |
1582 if (in_bb(use) && !visited_test(use) && | |
1583 // Don't go around backedge | |
1584 (!use->is_Phi() || n == entry)) { | |
1585 _stk.push(use); | |
1586 } | |
1587 } | |
1588 if (_stk.length() == size) { | |
1589 // There were no additional uses, post visit node now | |
1590 _stk.pop(); // Remove node from stack | |
1591 assert(rpo_idx >= 0, ""); | |
1592 _block.at_put_grow(rpo_idx, n); | |
1593 rpo_idx--; | |
1594 post_visited_set(n); | |
1595 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1596 } | |
1597 } else { | |
1598 _stk.pop(); // Remove post-visited node from stack | |
1599 } | |
1600 } | |
1601 | |
1602 // Create real map of block indices for nodes | |
1603 for (int j = 0; j < _block.length(); j++) { | |
1604 Node* n = _block.at(j); | |
1605 set_bb_idx(n, j); | |
1606 } | |
1607 | |
1608 initialize_bb(); // Ensure extra info is allocated. | |
1609 | |
1610 #ifndef PRODUCT | |
1611 if (TraceSuperWord) { | |
1612 print_bb(); | |
1613 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1614 for (int m = 0; m < _data_entry.length(); m++) { | |
1615 tty->print("%3d ", m); | |
1616 _data_entry.at(m)->dump(); | |
1617 } | |
1618 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1619 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1620 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1621 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1622 } | |
1623 } | |
1624 #endif | |
1625 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
1626 } | |
1627 | |
1628 //------------------------------initialize_bb--------------------------- | |
1629 // Initialize per node info | |
1630 void SuperWord::initialize_bb() { | |
1631 Node* last = _block.at(_block.length() - 1); | |
1632 grow_node_info(bb_idx(last)); | |
1633 } | |
1634 | |
1635 //------------------------------bb_insert_after--------------------------- | |
1636 // Insert n into block after pos | |
1637 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1638 int n_pos = pos + 1; | |
1639 // Make room | |
1640 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1641 _block.at_put_grow(i+1, _block.at(i)); | |
1642 } | |
1643 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1644 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1645 } | |
1646 // Set value | |
1647 _block.at_put_grow(n_pos, n); | |
1648 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1649 // Adjust map from node->_idx to _block index | |
1650 for (int i = n_pos; i < _block.length(); i++) { | |
1651 set_bb_idx(_block.at(i), i); | |
1652 } | |
1653 } | |
1654 | |
1655 //------------------------------compute_max_depth--------------------------- | |
1656 // Compute max depth for expressions from beginning of block | |
1657 // Use to prune search paths during test for independence. | |
1658 void SuperWord::compute_max_depth() { | |
1659 int ct = 0; | |
1660 bool again; | |
1661 do { | |
1662 again = false; | |
1663 for (int i = 0; i < _block.length(); i++) { | |
1664 Node* n = _block.at(i); | |
1665 if (!n->is_Phi()) { | |
1666 int d_orig = depth(n); | |
1667 int d_in = 0; | |
1668 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1669 Node* pred = preds.current(); | |
1670 if (in_bb(pred)) { | |
1671 d_in = MAX2(d_in, depth(pred)); | |
1672 } | |
1673 } | |
1674 if (d_in + 1 != d_orig) { | |
1675 set_depth(n, d_in + 1); | |
1676 again = true; | |
1677 } | |
1678 } | |
1679 } | |
1680 ct++; | |
1681 } while (again); | |
1682 #ifndef PRODUCT | |
1683 if (TraceSuperWord && Verbose) | |
1684 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1685 #endif | |
1686 } | |
1687 | |
1688 //-------------------------compute_vector_element_type----------------------- | |
1689 // Compute necessary vector element type for expressions | |
1690 // This propagates backwards a narrower integer type when the | |
1691 // upper bits of the value are not needed. | |
1692 // Example: char a,b,c; a = b + c; | |
1693 // Normally the type of the add is integer, but for packed character | |
1694 // operations the type of the add needs to be char. | |
1695 void SuperWord::compute_vector_element_type() { | |
1696 #ifndef PRODUCT | |
1697 if (TraceSuperWord && Verbose) | |
1698 tty->print_cr("\ncompute_velt_type:"); | |
1699 #endif | |
1700 | |
1701 // Initial type | |
1702 for (int i = 0; i < _block.length(); i++) { | |
1703 Node* n = _block.at(i); | |
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1704 set_velt_type(n, container_type(n)); |
0 | 1705 } |
1706 | |
1707 // Propagate narrowed type backwards through operations | |
1708 // that don't depend on higher order bits | |
1709 for (int i = _block.length() - 1; i >= 0; i--) { | |
1710 Node* n = _block.at(i); | |
1711 // Only integer types need be examined | |
1712 if (n->bottom_type()->isa_int()) { | |
1713 uint start, end; | |
1714 vector_opd_range(n, &start, &end); | |
1715 const Type* vt = velt_type(n); | |
1716 | |
1717 for (uint j = start; j < end; j++) { | |
1718 Node* in = n->in(j); | |
1719 // Don't propagate through a type conversion | |
1720 if (n->bottom_type() != in->bottom_type()) | |
1721 continue; | |
1722 switch(in->Opcode()) { | |
1723 case Op_AddI: case Op_AddL: | |
1724 case Op_SubI: case Op_SubL: | |
1725 case Op_MulI: case Op_MulL: | |
1726 case Op_AndI: case Op_AndL: | |
1727 case Op_OrI: case Op_OrL: | |
1728 case Op_XorI: case Op_XorL: | |
1729 case Op_LShiftI: case Op_LShiftL: | |
1730 case Op_CMoveI: case Op_CMoveL: | |
1731 if (in_bb(in)) { | |
1732 bool same_type = true; | |
1733 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { | |
1734 Node *use = in->fast_out(k); | |
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1735 if (!in_bb(use) || !same_velt_type(use, n)) { |
0 | 1736 same_type = false; |
1737 break; | |
1738 } | |
1739 } | |
1740 if (same_type) { | |
1741 set_velt_type(in, vt); | |
1742 } | |
1743 } | |
1744 } | |
1745 } | |
1746 } | |
1747 } | |
1748 #ifndef PRODUCT | |
1749 if (TraceSuperWord && Verbose) { | |
1750 for (int i = 0; i < _block.length(); i++) { | |
1751 Node* n = _block.at(i); | |
1752 velt_type(n)->dump(); | |
1753 tty->print("\t"); | |
1754 n->dump(); | |
1755 } | |
1756 } | |
1757 #endif | |
1758 } | |
1759 | |
1760 //------------------------------memory_alignment--------------------------- | |
1761 // Alignment within a vector memory reference | |
1762 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { | |
1763 SWPointer p(s, this); | |
1764 if (!p.valid()) { | |
1765 return bottom_align; | |
1766 } | |
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1767 int vw = vector_width_in_bytes(velt_basic_type(s)); |
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1768 if (vw < 2) { |
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1769 return bottom_align; // No vectors for this type |
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1770 } |
0 | 1771 int offset = p.offset_in_bytes(); |
1772 offset += iv_adjust_in_bytes; | |
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1773 int off_rem = offset % vw; |
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1774 int off_mod = off_rem >= 0 ? off_rem : off_rem + vw; |
0 | 1775 return off_mod; |
1776 } | |
1777 | |
1778 //---------------------------container_type--------------------------- | |
1779 // Smallest type containing range of values | |
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1780 const Type* SuperWord::container_type(Node* n) { |
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1781 if (n->is_Mem()) { |
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1782 return Type::get_const_basic_type(n->as_Mem()->memory_type()); |
0 | 1783 } |
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1784 const Type* t = _igvn.type(n); |
0 | 1785 if (t->basic_type() == T_INT) { |
1786 if (t->higher_equal(TypeInt::BOOL)) return TypeInt::BOOL; | |
1787 if (t->higher_equal(TypeInt::BYTE)) return TypeInt::BYTE; | |
1788 if (t->higher_equal(TypeInt::CHAR)) return TypeInt::CHAR; | |
1789 if (t->higher_equal(TypeInt::SHORT)) return TypeInt::SHORT; | |
1790 return TypeInt::INT; | |
1791 } | |
1792 return t; | |
1793 } | |
1794 | |
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1795 bool SuperWord::same_velt_type(Node* n1, Node* n2) { |
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1796 const Type* vt1 = velt_type(n1); |
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1797 const Type* vt2 = velt_type(n1); |
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1798 if (vt1->basic_type() == T_INT && vt2->basic_type() == T_INT) { |
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1799 // Compare vectors element sizes for integer types. |
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1800 return data_size(n1) == data_size(n2); |
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1801 } |
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1802 return vt1 == vt2; |
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1803 } |
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1804 |
0 | 1805 //-------------------------vector_opd_range----------------------- |
1806 // (Start, end] half-open range defining which operands are vector | |
1807 void SuperWord::vector_opd_range(Node* n, uint* start, uint* end) { | |
1808 switch (n->Opcode()) { | |
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1809 case Op_LoadB: case Op_LoadUB: |
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1810 case Op_LoadS: case Op_LoadUS: |
0 | 1811 case Op_LoadI: case Op_LoadL: |
1812 case Op_LoadF: case Op_LoadD: | |
1813 case Op_LoadP: | |
1814 *start = 0; | |
1815 *end = 0; | |
1816 return; | |
1817 case Op_StoreB: case Op_StoreC: | |
1818 case Op_StoreI: case Op_StoreL: | |
1819 case Op_StoreF: case Op_StoreD: | |
1820 case Op_StoreP: | |
1821 *start = MemNode::ValueIn; | |
1822 *end = *start + 1; | |
1823 return; | |
1824 case Op_LShiftI: case Op_LShiftL: | |
1825 *start = 1; | |
1826 *end = 2; | |
1827 return; | |
1828 case Op_CMoveI: case Op_CMoveL: case Op_CMoveF: case Op_CMoveD: | |
1829 *start = 2; | |
1830 *end = n->req(); | |
1831 return; | |
1832 } | |
1833 *start = 1; | |
1834 *end = n->req(); // default is all operands | |
1835 } | |
1836 | |
1837 //------------------------------in_packset--------------------------- | |
1838 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1839 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1840 for (int i = 0; i < _packset.length(); i++) { | |
1841 Node_List* p = _packset.at(i); | |
1842 assert(p->size() == 2, "must be"); | |
1843 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1844 return true; | |
1845 } | |
1846 } | |
1847 return false; | |
1848 } | |
1849 | |
1850 //------------------------------in_pack--------------------------- | |
1851 // Is s in pack p? | |
1852 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1853 for (uint i = 0; i < p->size(); i++) { | |
1854 if (p->at(i) == s) { | |
1855 return p; | |
1856 } | |
1857 } | |
1858 return NULL; | |
1859 } | |
1860 | |
1861 //------------------------------remove_pack_at--------------------------- | |
1862 // Remove the pack at position pos in the packset | |
1863 void SuperWord::remove_pack_at(int pos) { | |
1864 Node_List* p = _packset.at(pos); | |
1865 for (uint i = 0; i < p->size(); i++) { | |
1866 Node* s = p->at(i); | |
1867 set_my_pack(s, NULL); | |
1868 } | |
1869 _packset.remove_at(pos); | |
1870 } | |
1871 | |
1872 //------------------------------executed_first--------------------------- | |
1873 // Return the node executed first in pack p. Uses the RPO block list | |
1874 // to determine order. | |
1875 Node* SuperWord::executed_first(Node_List* p) { | |
1876 Node* n = p->at(0); | |
1877 int n_rpo = bb_idx(n); | |
1878 for (uint i = 1; i < p->size(); i++) { | |
1879 Node* s = p->at(i); | |
1880 int s_rpo = bb_idx(s); | |
1881 if (s_rpo < n_rpo) { | |
1882 n = s; | |
1883 n_rpo = s_rpo; | |
1884 } | |
1885 } | |
1886 return n; | |
1887 } | |
1888 | |
1889 //------------------------------executed_last--------------------------- | |
1890 // Return the node executed last in pack p. | |
1891 Node* SuperWord::executed_last(Node_List* p) { | |
1892 Node* n = p->at(0); | |
1893 int n_rpo = bb_idx(n); | |
1894 for (uint i = 1; i < p->size(); i++) { | |
1895 Node* s = p->at(i); | |
1896 int s_rpo = bb_idx(s); | |
1897 if (s_rpo > n_rpo) { | |
1898 n = s; | |
1899 n_rpo = s_rpo; | |
1900 } | |
1901 } | |
1902 return n; | |
1903 } | |
1904 | |
1905 //----------------------------align_initial_loop_index--------------------------- | |
1906 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1907 // to align_to_ref will be a position zero in the vector. | |
1908 // (iv + k) mod vector_align == 0 | |
1909 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1910 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1911 assert(main_head->is_main_loop(), ""); | |
1912 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
1913 assert(pre_end != NULL, ""); | |
1914 Node *pre_opaq1 = pre_end->limit(); | |
1915 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
1916 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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1917 Node *lim0 = pre_opaq->in(1); |
0 | 1918 |
1919 // Where we put new limit calculations | |
1920 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
1921 | |
1922 // Ensure the original loop limit is available from the | |
1923 // pre-loop Opaque1 node. | |
1924 Node *orig_limit = pre_opaq->original_loop_limit(); | |
1925 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
1926 | |
1927 SWPointer align_to_ref_p(align_to_ref, this); | |
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1928 assert(align_to_ref_p.valid(), "sanity"); |
0 | 1929 |
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1930 // Given: |
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1931 // lim0 == original pre loop limit |
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1932 // V == v_align (power of 2) |
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1933 // invar == extra invariant piece of the address expression |
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1934 // e == k [ +/- invar ] |
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1935 // |
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1936 // When reassociating expressions involving '%' the basic rules are: |
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1937 // (a - b) % k == 0 => a % k == b % k |
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1938 // and: |
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1939 // (a + b) % k == 0 => a % k == (k - b) % k |
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1940 // |
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1941 // For stride > 0 && scale > 0, |
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1942 // Derive the new pre-loop limit "lim" such that the two constraints: |
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1943 // (1) lim = lim0 + N (where N is some positive integer < V) |
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1944 // (2) (e + lim) % V == 0 |
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1945 // are true. |
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1946 // |
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1947 // Substituting (1) into (2), |
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1948 // (e + lim0 + N) % V == 0 |
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1949 // solve for N: |
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1950 // N = (V - (e + lim0)) % V |
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1951 // substitute back into (1), so that new limit |
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1952 // lim = lim0 + (V - (e + lim0)) % V |
0 | 1953 // |
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1954 // For stride > 0 && scale < 0 |
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1955 // Constraints: |
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1956 // lim = lim0 + N |
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1957 // (e - lim) % V == 0 |
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1958 // Solving for lim: |
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1959 // (e - lim0 - N) % V == 0 |
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1960 // N = (e - lim0) % V |
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1961 // lim = lim0 + (e - lim0) % V |
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1962 // |
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1963 // For stride < 0 && scale > 0 |
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1964 // Constraints: |
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1965 // lim = lim0 - N |
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1966 // (e + lim) % V == 0 |
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1967 // Solving for lim: |
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1968 // (e + lim0 - N) % V == 0 |
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1969 // N = (e + lim0) % V |
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1970 // lim = lim0 - (e + lim0) % V |
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1971 // |
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1972 // For stride < 0 && scale < 0 |
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1973 // Constraints: |
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1974 // lim = lim0 - N |
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1975 // (e - lim) % V == 0 |
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1976 // Solving for lim: |
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1977 // (e - lim0 + N) % V == 0 |
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1978 // N = (V - (e - lim0)) % V |
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1979 // lim = lim0 - (V - (e - lim0)) % V |
0 | 1980 |
6179
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1981 int vw = vector_width_in_bytes(velt_basic_type(align_to_ref)); |
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1982 assert(vw > 1, "sanity"); |
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1983 int stride = iv_stride(); |
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1984 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 1985 int elt_size = align_to_ref_p.memory_size(); |
6179
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1986 int v_align = vw / elt_size; |
0 | 1987 int k = align_to_ref_p.offset_in_bytes() / elt_size; |
1988 | |
1989 Node *kn = _igvn.intcon(k); | |
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1990 |
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1991 Node *e = kn; |
0 | 1992 if (align_to_ref_p.invar() != NULL) { |
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1993 // incorporate any extra invariant piece producing k +/- invar >>> log2(elt) |
0 | 1994 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
1995 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); | |
1996 _phase->_igvn.register_new_node_with_optimizer(aref); | |
1997 _phase->set_ctrl(aref, pre_ctrl); | |
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1998 if (align_to_ref_p.negate_invar()) { |
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1999 e = new (_phase->C, 3) SubINode(e, aref); |
0 | 2000 } else { |
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2001 e = new (_phase->C, 3) AddINode(e, aref); |
0 | 2002 } |
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2003 _phase->_igvn.register_new_node_with_optimizer(e); |
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2004 _phase->set_ctrl(e, pre_ctrl); |
0 | 2005 } |
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2006 if (vw > ObjectAlignmentInBytes) { |
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2007 // incorporate base e +/- base && Mask >>> log2(elt) |
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2008 Node* mask = _igvn.MakeConX(~(-1 << exact_log2(vw))); |
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2009 Node* xbase = new(_phase->C, 2) CastP2XNode(NULL, align_to_ref_p.base()); |
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2010 _phase->_igvn.register_new_node_with_optimizer(xbase); |
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2011 Node* masked_xbase = new (_phase->C, 3) AndXNode(xbase, mask); |
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2012 _phase->_igvn.register_new_node_with_optimizer(masked_xbase); |
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2013 #ifdef _LP64 |
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2014 masked_xbase = new (_phase->C, 2) ConvL2INode(masked_xbase); |
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2015 _phase->_igvn.register_new_node_with_optimizer(masked_xbase); |
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2016 #endif |
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2017 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
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2018 Node* bref = new (_phase->C, 3) URShiftINode(masked_xbase, log2_elt); |
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2019 _phase->_igvn.register_new_node_with_optimizer(bref); |
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2020 _phase->set_ctrl(bref, pre_ctrl); |
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2021 e = new (_phase->C, 3) AddINode(e, bref); |
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2022 _phase->_igvn.register_new_node_with_optimizer(e); |
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2023 _phase->set_ctrl(e, pre_ctrl); |
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2024 } |
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2025 |
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2026 // compute e +/- lim0 |
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2027 if (scale < 0) { |
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2028 e = new (_phase->C, 3) SubINode(e, lim0); |
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2029 } else { |
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2030 e = new (_phase->C, 3) AddINode(e, lim0); |
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2031 } |
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2032 _phase->_igvn.register_new_node_with_optimizer(e); |
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2033 _phase->set_ctrl(e, pre_ctrl); |
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2034 |
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2035 if (stride * scale > 0) { |
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2036 // compute V - (e +/- lim0) |
0 | 2037 Node* va = _igvn.intcon(v_align); |
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2038 e = new (_phase->C, 3) SubINode(va, e); |
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2039 _phase->_igvn.register_new_node_with_optimizer(e); |
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2040 _phase->set_ctrl(e, pre_ctrl); |
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2041 } |
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2042 // compute N = (exp) % V |
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2043 Node* va_msk = _igvn.intcon(v_align - 1); |
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2044 Node* N = new (_phase->C, 3) AndINode(e, va_msk); |
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2045 _phase->_igvn.register_new_node_with_optimizer(N); |
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2046 _phase->set_ctrl(N, pre_ctrl); |
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2047 |
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2048 // substitute back into (1), so that new limit |
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2049 // lim = lim0 + N |
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2050 Node* lim; |
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2051 if (stride < 0) { |
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2052 lim = new (_phase->C, 3) SubINode(lim0, N); |
0 | 2053 } else { |
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2054 lim = new (_phase->C, 3) AddINode(lim0, N); |
0 | 2055 } |
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2056 _phase->_igvn.register_new_node_with_optimizer(lim); |
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2057 _phase->set_ctrl(lim, pre_ctrl); |
0 | 2058 Node* constrained = |
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2059 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) |
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2060 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); |
0 | 2061 _phase->_igvn.register_new_node_with_optimizer(constrained); |
2062 _phase->set_ctrl(constrained, pre_ctrl); | |
2063 _igvn.hash_delete(pre_opaq); | |
2064 pre_opaq->set_req(1, constrained); | |
2065 } | |
2066 | |
2067 //----------------------------get_pre_loop_end--------------------------- | |
2068 // Find pre loop end from main loop. Returns null if none. | |
2069 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
2070 Node *ctrl = cl->in(LoopNode::EntryControl); | |
2071 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
2072 Node *iffm = ctrl->in(0); | |
2073 if (!iffm->is_If()) return NULL; | |
2074 Node *p_f = iffm->in(0); | |
2075 if (!p_f->is_IfFalse()) return NULL; | |
2076 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
2077 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
2078 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
2079 return pre_end; | |
2080 } | |
2081 | |
2082 | |
2083 //------------------------------init--------------------------- | |
2084 void SuperWord::init() { | |
2085 _dg.init(); | |
2086 _packset.clear(); | |
2087 _disjoint_ptrs.clear(); | |
2088 _block.clear(); | |
2089 _data_entry.clear(); | |
2090 _mem_slice_head.clear(); | |
2091 _mem_slice_tail.clear(); | |
2092 _node_info.clear(); | |
2093 _align_to_ref = NULL; | |
2094 _lpt = NULL; | |
2095 _lp = NULL; | |
2096 _bb = NULL; | |
2097 _iv = NULL; | |
2098 } | |
2099 | |
2100 //------------------------------print_packset--------------------------- | |
2101 void SuperWord::print_packset() { | |
2102 #ifndef PRODUCT | |
2103 tty->print_cr("packset"); | |
2104 for (int i = 0; i < _packset.length(); i++) { | |
2105 tty->print_cr("Pack: %d", i); | |
2106 Node_List* p = _packset.at(i); | |
2107 print_pack(p); | |
2108 } | |
2109 #endif | |
2110 } | |
2111 | |
2112 //------------------------------print_pack--------------------------- | |
2113 void SuperWord::print_pack(Node_List* p) { | |
2114 for (uint i = 0; i < p->size(); i++) { | |
2115 print_stmt(p->at(i)); | |
2116 } | |
2117 } | |
2118 | |
2119 //------------------------------print_bb--------------------------- | |
2120 void SuperWord::print_bb() { | |
2121 #ifndef PRODUCT | |
2122 tty->print_cr("\nBlock"); | |
2123 for (int i = 0; i < _block.length(); i++) { | |
2124 Node* n = _block.at(i); | |
2125 tty->print("%d ", i); | |
2126 if (n) { | |
2127 n->dump(); | |
2128 } | |
2129 } | |
2130 #endif | |
2131 } | |
2132 | |
2133 //------------------------------print_stmt--------------------------- | |
2134 void SuperWord::print_stmt(Node* s) { | |
2135 #ifndef PRODUCT | |
2136 tty->print(" align: %d \t", alignment(s)); | |
2137 s->dump(); | |
2138 #endif | |
2139 } | |
2140 | |
2141 //------------------------------blank--------------------------- | |
2142 char* SuperWord::blank(uint depth) { | |
2143 static char blanks[101]; | |
2144 assert(depth < 101, "too deep"); | |
2145 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
2146 blanks[depth] = '\0'; | |
2147 return blanks; | |
2148 } | |
2149 | |
2150 | |
2151 //==============================SWPointer=========================== | |
2152 | |
2153 //----------------------------SWPointer------------------------ | |
2154 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
2155 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
2156 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
2157 | |
2158 Node* adr = mem->in(MemNode::Address); | |
2159 if (!adr->is_AddP()) { | |
2160 assert(!valid(), "too complex"); | |
2161 return; | |
2162 } | |
2163 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
2164 Node* base = adr->in(AddPNode::Base); | |
1058
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2165 //unsafe reference could not be aligned appropriately without runtime checking |
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2166 if (base == NULL || base->bottom_type() == Type::TOP) { |
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2167 assert(!valid(), "unsafe access"); |
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2168 return; |
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2169 } |
0 | 2170 for (int i = 0; i < 3; i++) { |
2171 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
2172 assert(!valid(), "too complex"); | |
2173 return; | |
2174 } | |
2175 adr = adr->in(AddPNode::Address); | |
2176 if (base == adr || !adr->is_AddP()) { | |
2177 break; // stop looking at addp's | |
2178 } | |
2179 } | |
2180 _base = base; | |
2181 _adr = adr; | |
2182 assert(valid(), "Usable"); | |
2183 } | |
2184 | |
2185 // Following is used to create a temporary object during | |
2186 // the pattern match of an address expression. | |
2187 SWPointer::SWPointer(SWPointer* p) : | |
2188 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
2189 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
2190 | |
2191 //------------------------scaled_iv_plus_offset-------------------- | |
2192 // Match: k*iv + offset | |
2193 // where: k is a constant that maybe zero, and | |
2194 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
2195 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
2196 if (scaled_iv(n)) { | |
2197 return true; | |
2198 } | |
2199 if (offset_plus_k(n)) { | |
2200 return true; | |
2201 } | |
2202 int opc = n->Opcode(); | |
2203 if (opc == Op_AddI) { | |
2204 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
2205 return true; | |
2206 } | |
2207 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2208 return true; | |
2209 } | |
2210 } else if (opc == Op_SubI) { | |
2211 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
2212 return true; | |
2213 } | |
2214 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2215 _scale *= -1; | |
2216 return true; | |
2217 } | |
2218 } | |
2219 return false; | |
2220 } | |
2221 | |
2222 //----------------------------scaled_iv------------------------ | |
2223 // Match: k*iv where k is a constant that's not zero | |
2224 bool SWPointer::scaled_iv(Node* n) { | |
2225 if (_scale != 0) { | |
2226 return false; // already found a scale | |
2227 } | |
2228 if (n == iv()) { | |
2229 _scale = 1; | |
2230 return true; | |
2231 } | |
2232 int opc = n->Opcode(); | |
2233 if (opc == Op_MulI) { | |
2234 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2235 _scale = n->in(2)->get_int(); | |
2236 return true; | |
2237 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
2238 _scale = n->in(1)->get_int(); | |
2239 return true; | |
2240 } | |
2241 } else if (opc == Op_LShiftI) { | |
2242 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2243 _scale = 1 << n->in(2)->get_int(); | |
2244 return true; | |
2245 } | |
2246 } else if (opc == Op_ConvI2L) { | |
2247 if (scaled_iv_plus_offset(n->in(1))) { | |
2248 return true; | |
2249 } | |
2250 } else if (opc == Op_LShiftL) { | |
2251 if (!has_iv() && _invar == NULL) { | |
2252 // Need to preserve the current _offset value, so | |
2253 // create a temporary object for this expression subtree. | |
2254 // Hacky, so should re-engineer the address pattern match. | |
2255 SWPointer tmp(this); | |
2256 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
2257 if (tmp._invar == NULL) { | |
2258 int mult = 1 << n->in(2)->get_int(); | |
2259 _scale = tmp._scale * mult; | |
2260 _offset += tmp._offset * mult; | |
2261 return true; | |
2262 } | |
2263 } | |
2264 } | |
2265 } | |
2266 return false; | |
2267 } | |
2268 | |
2269 //----------------------------offset_plus_k------------------------ | |
2270 // Match: offset is (k [+/- invariant]) | |
2271 // where k maybe zero and invariant is optional, but not both. | |
2272 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
2273 int opc = n->Opcode(); | |
2274 if (opc == Op_ConI) { | |
2275 _offset += negate ? -(n->get_int()) : n->get_int(); | |
2276 return true; | |
2277 } else if (opc == Op_ConL) { | |
2278 // Okay if value fits into an int | |
2279 const TypeLong* t = n->find_long_type(); | |
2280 if (t->higher_equal(TypeLong::INT)) { | |
2281 jlong loff = n->get_long(); | |
2282 jint off = (jint)loff; | |
2283 _offset += negate ? -off : loff; | |
2284 return true; | |
2285 } | |
2286 return false; | |
2287 } | |
2288 if (_invar != NULL) return false; // already have an invariant | |
2289 if (opc == Op_AddI) { | |
2290 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2291 _negate_invar = negate; | |
2292 _invar = n->in(1); | |
2293 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2294 return true; | |
2295 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2296 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2297 _negate_invar = negate; | |
2298 _invar = n->in(2); | |
2299 return true; | |
2300 } | |
2301 } | |
2302 if (opc == Op_SubI) { | |
2303 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2304 _negate_invar = negate; | |
2305 _invar = n->in(1); | |
2306 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2307 return true; | |
2308 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2309 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2310 _negate_invar = !negate; | |
2311 _invar = n->in(2); | |
2312 return true; | |
2313 } | |
2314 } | |
2315 if (invariant(n)) { | |
2316 _negate_invar = negate; | |
2317 _invar = n; | |
2318 return true; | |
2319 } | |
2320 return false; | |
2321 } | |
2322 | |
2323 //----------------------------print------------------------ | |
2324 void SWPointer::print() { | |
2325 #ifndef PRODUCT | |
2326 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
2327 _base != NULL ? _base->_idx : 0, | |
2328 _adr != NULL ? _adr->_idx : 0, | |
2329 _scale, _offset, | |
2330 _negate_invar?'-':'+', | |
2331 _invar != NULL ? _invar->_idx : 0); | |
2332 #endif | |
2333 } | |
2334 | |
2335 // ========================= OrderedPair ===================== | |
2336 | |
2337 const OrderedPair OrderedPair::initial; | |
2338 | |
2339 // ========================= SWNodeInfo ===================== | |
2340 | |
2341 const SWNodeInfo SWNodeInfo::initial; | |
2342 | |
2343 | |
2344 // ============================ DepGraph =========================== | |
2345 | |
2346 //------------------------------make_node--------------------------- | |
2347 // Make a new dependence graph node for an ideal node. | |
2348 DepMem* DepGraph::make_node(Node* node) { | |
2349 DepMem* m = new (_arena) DepMem(node); | |
2350 if (node != NULL) { | |
2351 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
2352 _map.at_put_grow(node->_idx, m); | |
2353 } | |
2354 return m; | |
2355 } | |
2356 | |
2357 //------------------------------make_edge--------------------------- | |
2358 // Make a new dependence graph edge from dpred -> dsucc | |
2359 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
2360 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
2361 dpred->set_out_head(e); | |
2362 dsucc->set_in_head(e); | |
2363 return e; | |
2364 } | |
2365 | |
2366 // ========================== DepMem ======================== | |
2367 | |
2368 //------------------------------in_cnt--------------------------- | |
2369 int DepMem::in_cnt() { | |
2370 int ct = 0; | |
2371 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
2372 return ct; | |
2373 } | |
2374 | |
2375 //------------------------------out_cnt--------------------------- | |
2376 int DepMem::out_cnt() { | |
2377 int ct = 0; | |
2378 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
2379 return ct; | |
2380 } | |
2381 | |
2382 //------------------------------print----------------------------- | |
2383 void DepMem::print() { | |
2384 #ifndef PRODUCT | |
2385 tty->print(" DepNode %d (", _node->_idx); | |
2386 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
2387 Node* pred = p->pred()->node(); | |
2388 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
2389 } | |
2390 tty->print(") ["); | |
2391 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
2392 Node* succ = s->succ()->node(); | |
2393 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
2394 } | |
2395 tty->print_cr(" ]"); | |
2396 #endif | |
2397 } | |
2398 | |
2399 // =========================== DepEdge ========================= | |
2400 | |
2401 //------------------------------DepPreds--------------------------- | |
2402 void DepEdge::print() { | |
2403 #ifndef PRODUCT | |
2404 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2405 #endif | |
2406 } | |
2407 | |
2408 // =========================== DepPreds ========================= | |
2409 // Iterator over predecessor edges in the dependence graph. | |
2410 | |
2411 //------------------------------DepPreds--------------------------- | |
2412 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2413 _n = n; | |
2414 _done = false; | |
2415 if (_n->is_Store() || _n->is_Load()) { | |
2416 _next_idx = MemNode::Address; | |
2417 _end_idx = n->req(); | |
2418 _dep_next = dg.dep(_n)->in_head(); | |
2419 } else if (_n->is_Mem()) { | |
2420 _next_idx = 0; | |
2421 _end_idx = 0; | |
2422 _dep_next = dg.dep(_n)->in_head(); | |
2423 } else { | |
2424 _next_idx = 1; | |
2425 _end_idx = _n->req(); | |
2426 _dep_next = NULL; | |
2427 } | |
2428 next(); | |
2429 } | |
2430 | |
2431 //------------------------------next--------------------------- | |
2432 void DepPreds::next() { | |
2433 if (_dep_next != NULL) { | |
2434 _current = _dep_next->pred()->node(); | |
2435 _dep_next = _dep_next->next_in(); | |
2436 } else if (_next_idx < _end_idx) { | |
2437 _current = _n->in(_next_idx++); | |
2438 } else { | |
2439 _done = true; | |
2440 } | |
2441 } | |
2442 | |
2443 // =========================== DepSuccs ========================= | |
2444 // Iterator over successor edges in the dependence graph. | |
2445 | |
2446 //------------------------------DepSuccs--------------------------- | |
2447 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2448 _n = n; | |
2449 _done = false; | |
2450 if (_n->is_Load()) { | |
2451 _next_idx = 0; | |
2452 _end_idx = _n->outcnt(); | |
2453 _dep_next = dg.dep(_n)->out_head(); | |
2454 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2455 _next_idx = 0; | |
2456 _end_idx = 0; | |
2457 _dep_next = dg.dep(_n)->out_head(); | |
2458 } else { | |
2459 _next_idx = 0; | |
2460 _end_idx = _n->outcnt(); | |
2461 _dep_next = NULL; | |
2462 } | |
2463 next(); | |
2464 } | |
2465 | |
2466 //-------------------------------next--------------------------- | |
2467 void DepSuccs::next() { | |
2468 if (_dep_next != NULL) { | |
2469 _current = _dep_next->succ()->node(); | |
2470 _dep_next = _dep_next->next_out(); | |
2471 } else if (_next_idx < _end_idx) { | |
2472 _current = _n->raw_out(_next_idx++); | |
2473 } else { | |
2474 _done = true; | |
2475 } | |
2476 } |