Mercurial > hg > graal-compiler
annotate src/share/vm/opto/superword.cpp @ 6636:0acd345fd810
7160161: Missed safepoint in non-Counted loop
Summary: Do not remove safepoints during peeling optimization.
Reviewed-by: twisti
author | kvn |
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date | Wed, 29 Aug 2012 13:02:40 -0700 |
parents | 5af51c882207 |
children | 137868b7aa6f |
rev | line source |
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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 (!Matcher::misaligned_vectors_ok()) { |
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227 int vw = vector_width(mem_ref); |
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228 int vw_best = vector_width(best_align_to_mem_ref); |
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229 if (vw > vw_best) { |
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230 // Do not vectorize a memory access with more elements per vector |
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231 // if unaligned memory access is not allowed because number of |
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232 // iterations in pre-loop will be not enough to align it. |
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233 create_pack = false; |
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234 } |
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235 } |
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236 } else { |
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237 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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238 // Can't allow vectorization of unaligned memory accesses with the |
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239 // same type since it could be overlapped accesses to the same array. |
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240 create_pack = false; |
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241 } else { |
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242 // Allow independent (different type) unaligned memory operations |
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243 // if HW supports them. |
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244 if (!Matcher::misaligned_vectors_ok()) { |
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245 create_pack = false; |
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246 } else { |
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247 // Check if packs of the same memory type but |
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248 // with a different alignment were created before. |
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249 for (uint i = 0; i < align_to_refs.size(); i++) { |
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250 MemNode* mr = align_to_refs.at(i)->as_Mem(); |
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251 if (same_velt_type(mr, mem_ref) && |
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252 memory_alignment(mr, iv_adjustment) != 0) |
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253 create_pack = false; |
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254 } |
0 | 255 } |
256 } | |
257 } | |
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258 if (create_pack) { |
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259 for (uint i = 0; i < memops.size(); i++) { |
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260 Node* s1 = memops.at(i); |
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261 int align = alignment(s1); |
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262 if (align == top_align) continue; |
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263 for (uint j = 0; j < memops.size(); j++) { |
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264 Node* s2 = memops.at(j); |
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265 if (alignment(s2) == top_align) continue; |
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266 if (s1 != s2 && are_adjacent_refs(s1, s2)) { |
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267 if (stmts_can_pack(s1, s2, align)) { |
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268 Node_List* pair = new Node_List(); |
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269 pair->push(s1); |
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270 pair->push(s2); |
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271 _packset.append(pair); |
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272 } |
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273 } |
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274 } |
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275 } |
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276 } else { // Don't create unaligned pack |
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277 // First, remove remaining memory ops of the same type from the list. |
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278 for (int i = memops.size() - 1; i >= 0; i--) { |
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279 MemNode* s = memops.at(i)->as_Mem(); |
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280 if (same_velt_type(s, mem_ref)) { |
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281 memops.remove(i); |
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282 } |
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283 } |
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284 |
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285 // Second, remove already constructed packs of the same type. |
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286 for (int i = _packset.length() - 1; i >= 0; i--) { |
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287 Node_List* p = _packset.at(i); |
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288 MemNode* s = p->at(0)->as_Mem(); |
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289 if (same_velt_type(s, mem_ref)) { |
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290 remove_pack_at(i); |
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291 } |
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292 } |
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293 |
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294 // If needed find the best memory reference for loop alignment again. |
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295 if (same_velt_type(mem_ref, best_align_to_mem_ref)) { |
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296 // Put memory ops from remaining packs back on memops list for |
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297 // the best alignment search. |
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298 uint orig_msize = memops.size(); |
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299 for (int i = 0; i < _packset.length(); i++) { |
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300 Node_List* p = _packset.at(i); |
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301 MemNode* s = p->at(0)->as_Mem(); |
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302 assert(!same_velt_type(s, mem_ref), "sanity"); |
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303 memops.push(s); |
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304 } |
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305 MemNode* best_align_to_mem_ref = find_align_to_ref(memops); |
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306 if (best_align_to_mem_ref == NULL) break; |
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307 best_iv_adjustment = get_iv_adjustment(best_align_to_mem_ref); |
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308 // Restore list. |
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309 while (memops.size() > orig_msize) |
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310 (void)memops.pop(); |
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311 } |
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312 } // unaligned memory accesses |
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313 |
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314 // Remove used mem nodes. |
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315 for (int i = memops.size() - 1; i >= 0; i--) { |
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316 MemNode* m = memops.at(i)->as_Mem(); |
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317 if (alignment(m) != top_align) { |
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318 memops.remove(i); |
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319 } |
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320 } |
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321 |
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322 } // while (memops.size() != 0 |
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323 set_align_to_ref(best_align_to_mem_ref); |
0 | 324 |
325 #ifndef PRODUCT | |
326 if (TraceSuperWord) { | |
327 tty->print_cr("\nAfter find_adjacent_refs"); | |
328 print_packset(); | |
329 } | |
330 #endif | |
331 } | |
332 | |
333 //------------------------------find_align_to_ref--------------------------- | |
334 // Find a memory reference to align the loop induction variable to. | |
335 // Looks first at stores then at loads, looking for a memory reference | |
336 // with the largest number of references similar to it. | |
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337 MemNode* SuperWord::find_align_to_ref(Node_List &memops) { |
0 | 338 GrowableArray<int> cmp_ct(arena(), memops.size(), memops.size(), 0); |
339 | |
340 // Count number of comparable memory ops | |
341 for (uint i = 0; i < memops.size(); i++) { | |
342 MemNode* s1 = memops.at(i)->as_Mem(); | |
343 SWPointer p1(s1, this); | |
344 // Discard if pre loop can't align this reference | |
345 if (!ref_is_alignable(p1)) { | |
346 *cmp_ct.adr_at(i) = 0; | |
347 continue; | |
348 } | |
349 for (uint j = i+1; j < memops.size(); j++) { | |
350 MemNode* s2 = memops.at(j)->as_Mem(); | |
351 if (isomorphic(s1, s2)) { | |
352 SWPointer p2(s2, this); | |
353 if (p1.comparable(p2)) { | |
354 (*cmp_ct.adr_at(i))++; | |
355 (*cmp_ct.adr_at(j))++; | |
356 } | |
357 } | |
358 } | |
359 } | |
360 | |
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361 // Find Store (or Load) with the greatest number of "comparable" references, |
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362 // biggest vector size, smallest data size and smallest iv offset. |
0 | 363 int max_ct = 0; |
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364 int max_vw = 0; |
0 | 365 int max_idx = -1; |
366 int min_size = max_jint; | |
367 int min_iv_offset = max_jint; | |
368 for (uint j = 0; j < memops.size(); j++) { | |
369 MemNode* s = memops.at(j)->as_Mem(); | |
370 if (s->is_Store()) { | |
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371 int vw = vector_width_in_bytes(s); |
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372 assert(vw > 1, "sanity"); |
0 | 373 SWPointer p(s, this); |
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374 if (cmp_ct.at(j) > max_ct || |
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375 cmp_ct.at(j) == max_ct && |
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376 (vw > max_vw || |
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377 vw == max_vw && |
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378 (data_size(s) < min_size || |
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379 data_size(s) == min_size && |
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380 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 381 max_ct = cmp_ct.at(j); |
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382 max_vw = vw; |
0 | 383 max_idx = j; |
384 min_size = data_size(s); | |
385 min_iv_offset = p.offset_in_bytes(); | |
386 } | |
387 } | |
388 } | |
389 // If no stores, look at loads | |
390 if (max_ct == 0) { | |
391 for (uint j = 0; j < memops.size(); j++) { | |
392 MemNode* s = memops.at(j)->as_Mem(); | |
393 if (s->is_Load()) { | |
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394 int vw = vector_width_in_bytes(s); |
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395 assert(vw > 1, "sanity"); |
0 | 396 SWPointer p(s, this); |
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397 if (cmp_ct.at(j) > max_ct || |
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398 cmp_ct.at(j) == max_ct && |
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399 (vw > max_vw || |
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400 vw == max_vw && |
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401 (data_size(s) < min_size || |
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402 data_size(s) == min_size && |
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403 (p.offset_in_bytes() < min_iv_offset)))) { |
0 | 404 max_ct = cmp_ct.at(j); |
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405 max_vw = vw; |
0 | 406 max_idx = j; |
407 min_size = data_size(s); | |
408 min_iv_offset = p.offset_in_bytes(); | |
409 } | |
410 } | |
411 } | |
412 } | |
413 | |
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414 #ifdef ASSERT |
0 | 415 if (TraceSuperWord && Verbose) { |
416 tty->print_cr("\nVector memops after find_align_to_refs"); | |
417 for (uint i = 0; i < memops.size(); i++) { | |
418 MemNode* s = memops.at(i)->as_Mem(); | |
419 s->dump(); | |
420 } | |
421 } | |
422 #endif | |
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423 |
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424 if (max_ct > 0) { |
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425 #ifdef ASSERT |
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426 if (TraceSuperWord) { |
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427 tty->print("\nVector align to node: "); |
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428 memops.at(max_idx)->as_Mem()->dump(); |
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429 } |
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430 #endif |
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431 return memops.at(max_idx)->as_Mem(); |
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432 } |
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433 return NULL; |
0 | 434 } |
435 | |
436 //------------------------------ref_is_alignable--------------------------- | |
437 // Can the preloop align the reference to position zero in the vector? | |
438 bool SuperWord::ref_is_alignable(SWPointer& p) { | |
439 if (!p.has_iv()) { | |
440 return true; // no induction variable | |
441 } | |
442 CountedLoopEndNode* pre_end = get_pre_loop_end(lp()->as_CountedLoop()); | |
443 assert(pre_end->stride_is_con(), "pre loop stride is constant"); | |
444 int preloop_stride = pre_end->stride_con(); | |
445 | |
446 int span = preloop_stride * p.scale_in_bytes(); | |
447 | |
448 // Stride one accesses are alignable. | |
449 if (ABS(span) == p.memory_size()) | |
450 return true; | |
451 | |
452 // If initial offset from start of object is computable, | |
453 // compute alignment within the vector. | |
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454 int vw = vector_width_in_bytes(p.mem()); |
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455 assert(vw > 1, "sanity"); |
0 | 456 if (vw % span == 0) { |
457 Node* init_nd = pre_end->init_trip(); | |
458 if (init_nd->is_Con() && p.invar() == NULL) { | |
459 int init = init_nd->bottom_type()->is_int()->get_con(); | |
460 | |
461 int init_offset = init * p.scale_in_bytes() + p.offset_in_bytes(); | |
462 assert(init_offset >= 0, "positive offset from object start"); | |
463 | |
464 if (span > 0) { | |
465 return (vw - (init_offset % vw)) % span == 0; | |
466 } else { | |
467 assert(span < 0, "nonzero stride * scale"); | |
468 return (init_offset % vw) % -span == 0; | |
469 } | |
470 } | |
471 } | |
472 return false; | |
473 } | |
474 | |
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475 //---------------------------get_iv_adjustment--------------------------- |
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476 // Calculate loop's iv adjustment for this memory ops. |
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477 int SuperWord::get_iv_adjustment(MemNode* mem_ref) { |
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478 SWPointer align_to_ref_p(mem_ref, this); |
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479 int offset = align_to_ref_p.offset_in_bytes(); |
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480 int scale = align_to_ref_p.scale_in_bytes(); |
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481 int vw = vector_width_in_bytes(mem_ref); |
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482 assert(vw > 1, "sanity"); |
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483 int stride_sign = (scale * iv_stride()) > 0 ? 1 : -1; |
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484 int iv_adjustment = (stride_sign * vw - (offset % vw)) % vw; |
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485 |
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486 #ifndef PRODUCT |
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487 if (TraceSuperWord) |
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488 tty->print_cr("\noffset = %d iv_adjust = %d elt_size = %d scale = %d iv_stride = %d vect_size %d", |
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489 offset, iv_adjustment, align_to_ref_p.memory_size(), scale, iv_stride(), vw); |
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490 #endif |
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491 return iv_adjustment; |
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492 } |
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493 |
0 | 494 //---------------------------dependence_graph--------------------------- |
495 // Construct dependency graph. | |
496 // Add dependence edges to load/store nodes for memory dependence | |
497 // A.out()->DependNode.in(1) and DependNode.out()->B.prec(x) | |
498 void SuperWord::dependence_graph() { | |
499 // First, assign a dependence node to each memory node | |
500 for (int i = 0; i < _block.length(); i++ ) { | |
501 Node *n = _block.at(i); | |
502 if (n->is_Mem() || n->is_Phi() && n->bottom_type() == Type::MEMORY) { | |
503 _dg.make_node(n); | |
504 } | |
505 } | |
506 | |
507 // For each memory slice, create the dependences | |
508 for (int i = 0; i < _mem_slice_head.length(); i++) { | |
509 Node* n = _mem_slice_head.at(i); | |
510 Node* n_tail = _mem_slice_tail.at(i); | |
511 | |
512 // Get slice in predecessor order (last is first) | |
513 mem_slice_preds(n_tail, n, _nlist); | |
514 | |
515 // Make the slice dependent on the root | |
516 DepMem* slice = _dg.dep(n); | |
517 _dg.make_edge(_dg.root(), slice); | |
518 | |
519 // Create a sink for the slice | |
520 DepMem* slice_sink = _dg.make_node(NULL); | |
521 _dg.make_edge(slice_sink, _dg.tail()); | |
522 | |
523 // Now visit each pair of memory ops, creating the edges | |
524 for (int j = _nlist.length() - 1; j >= 0 ; j--) { | |
525 Node* s1 = _nlist.at(j); | |
526 | |
527 // If no dependency yet, use slice | |
528 if (_dg.dep(s1)->in_cnt() == 0) { | |
529 _dg.make_edge(slice, s1); | |
530 } | |
531 SWPointer p1(s1->as_Mem(), this); | |
532 bool sink_dependent = true; | |
533 for (int k = j - 1; k >= 0; k--) { | |
534 Node* s2 = _nlist.at(k); | |
535 if (s1->is_Load() && s2->is_Load()) | |
536 continue; | |
537 SWPointer p2(s2->as_Mem(), this); | |
538 | |
539 int cmp = p1.cmp(p2); | |
540 if (SuperWordRTDepCheck && | |
541 p1.base() != p2.base() && p1.valid() && p2.valid()) { | |
542 // Create a runtime check to disambiguate | |
543 OrderedPair pp(p1.base(), p2.base()); | |
544 _disjoint_ptrs.append_if_missing(pp); | |
545 } else if (!SWPointer::not_equal(cmp)) { | |
546 // Possibly same address | |
547 _dg.make_edge(s1, s2); | |
548 sink_dependent = false; | |
549 } | |
550 } | |
551 if (sink_dependent) { | |
552 _dg.make_edge(s1, slice_sink); | |
553 } | |
554 } | |
555 #ifndef PRODUCT | |
556 if (TraceSuperWord) { | |
557 tty->print_cr("\nDependence graph for slice: %d", n->_idx); | |
558 for (int q = 0; q < _nlist.length(); q++) { | |
559 _dg.print(_nlist.at(q)); | |
560 } | |
561 tty->cr(); | |
562 } | |
563 #endif | |
564 _nlist.clear(); | |
565 } | |
566 | |
567 #ifndef PRODUCT | |
568 if (TraceSuperWord) { | |
569 tty->print_cr("\ndisjoint_ptrs: %s", _disjoint_ptrs.length() > 0 ? "" : "NONE"); | |
570 for (int r = 0; r < _disjoint_ptrs.length(); r++) { | |
571 _disjoint_ptrs.at(r).print(); | |
572 tty->cr(); | |
573 } | |
574 tty->cr(); | |
575 } | |
576 #endif | |
577 } | |
578 | |
579 //---------------------------mem_slice_preds--------------------------- | |
580 // Return a memory slice (node list) in predecessor order starting at "start" | |
581 void SuperWord::mem_slice_preds(Node* start, Node* stop, GrowableArray<Node*> &preds) { | |
582 assert(preds.length() == 0, "start empty"); | |
583 Node* n = start; | |
584 Node* prev = NULL; | |
585 while (true) { | |
586 assert(in_bb(n), "must be in block"); | |
587 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
588 Node* out = n->fast_out(i); | |
589 if (out->is_Load()) { | |
590 if (in_bb(out)) { | |
591 preds.push(out); | |
592 } | |
593 } else { | |
594 // FIXME | |
595 if (out->is_MergeMem() && !in_bb(out)) { | |
596 // Either unrolling is causing a memory edge not to disappear, | |
597 // or need to run igvn.optimize() again before SLP | |
598 } else if (out->is_Phi() && out->bottom_type() == Type::MEMORY && !in_bb(out)) { | |
599 // Ditto. Not sure what else to check further. | |
667 | 600 } else if (out->Opcode() == Op_StoreCM && out->in(MemNode::OopStore) == n) { |
0 | 601 // StoreCM has an input edge used as a precedence edge. |
602 // Maybe an issue when oop stores are vectorized. | |
603 } else { | |
604 assert(out == prev || prev == NULL, "no branches off of store slice"); | |
605 } | |
606 } | |
607 } | |
608 if (n == stop) break; | |
609 preds.push(n); | |
610 prev = n; | |
611 n = n->in(MemNode::Memory); | |
612 } | |
613 } | |
614 | |
615 //------------------------------stmts_can_pack--------------------------- | |
605 | 616 // Can s1 and s2 be in a pack with s1 immediately preceding s2 and |
0 | 617 // s1 aligned at "align" |
618 bool SuperWord::stmts_can_pack(Node* s1, Node* s2, int align) { | |
987
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619 |
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620 // Do not use superword for non-primitives |
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621 BasicType bt1 = velt_basic_type(s1); |
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622 BasicType bt2 = velt_basic_type(s2); |
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623 if(!is_java_primitive(bt1) || !is_java_primitive(bt2)) |
987
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624 return false; |
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625 if (Matcher::max_vector_size(bt1) < 2) { |
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626 return false; // No vectors for this type |
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627 } |
987
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628 |
0 | 629 if (isomorphic(s1, s2)) { |
630 if (independent(s1, s2)) { | |
631 if (!exists_at(s1, 0) && !exists_at(s2, 1)) { | |
632 if (!s1->is_Mem() || are_adjacent_refs(s1, s2)) { | |
633 int s1_align = alignment(s1); | |
634 int s2_align = alignment(s2); | |
635 if (s1_align == top_align || s1_align == align) { | |
636 if (s2_align == top_align || s2_align == align + data_size(s1)) { | |
637 return true; | |
638 } | |
639 } | |
640 } | |
641 } | |
642 } | |
643 } | |
644 return false; | |
645 } | |
646 | |
647 //------------------------------exists_at--------------------------- | |
648 // Does s exist in a pack at position pos? | |
649 bool SuperWord::exists_at(Node* s, uint pos) { | |
650 for (int i = 0; i < _packset.length(); i++) { | |
651 Node_List* p = _packset.at(i); | |
652 if (p->at(pos) == s) { | |
653 return true; | |
654 } | |
655 } | |
656 return false; | |
657 } | |
658 | |
659 //------------------------------are_adjacent_refs--------------------------- | |
660 // Is s1 immediately before s2 in memory? | |
661 bool SuperWord::are_adjacent_refs(Node* s1, Node* s2) { | |
662 if (!s1->is_Mem() || !s2->is_Mem()) return false; | |
663 if (!in_bb(s1) || !in_bb(s2)) return false; | |
1585 | 664 |
665 // Do not use superword for non-primitives | |
666 if (!is_java_primitive(s1->as_Mem()->memory_type()) || | |
667 !is_java_primitive(s2->as_Mem()->memory_type())) { | |
668 return false; | |
669 } | |
670 | |
0 | 671 // FIXME - co_locate_pack fails on Stores in different mem-slices, so |
672 // only pack memops that are in the same alias set until that's fixed. | |
673 if (_phase->C->get_alias_index(s1->as_Mem()->adr_type()) != | |
674 _phase->C->get_alias_index(s2->as_Mem()->adr_type())) | |
675 return false; | |
676 SWPointer p1(s1->as_Mem(), this); | |
677 SWPointer p2(s2->as_Mem(), this); | |
678 if (p1.base() != p2.base() || !p1.comparable(p2)) return false; | |
679 int diff = p2.offset_in_bytes() - p1.offset_in_bytes(); | |
680 return diff == data_size(s1); | |
681 } | |
682 | |
683 //------------------------------isomorphic--------------------------- | |
684 // Are s1 and s2 similar? | |
685 bool SuperWord::isomorphic(Node* s1, Node* s2) { | |
686 if (s1->Opcode() != s2->Opcode()) return false; | |
687 if (s1->req() != s2->req()) return false; | |
688 if (s1->in(0) != s2->in(0)) return false; | |
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689 if (!same_velt_type(s1, s2)) return false; |
0 | 690 return true; |
691 } | |
692 | |
693 //------------------------------independent--------------------------- | |
694 // Is there no data path from s1 to s2 or s2 to s1? | |
695 bool SuperWord::independent(Node* s1, Node* s2) { | |
696 // assert(s1->Opcode() == s2->Opcode(), "check isomorphic first"); | |
697 int d1 = depth(s1); | |
698 int d2 = depth(s2); | |
699 if (d1 == d2) return s1 != s2; | |
700 Node* deep = d1 > d2 ? s1 : s2; | |
701 Node* shallow = d1 > d2 ? s2 : s1; | |
702 | |
703 visited_clear(); | |
704 | |
705 return independent_path(shallow, deep); | |
706 } | |
707 | |
708 //------------------------------independent_path------------------------------ | |
709 // Helper for independent | |
710 bool SuperWord::independent_path(Node* shallow, Node* deep, uint dp) { | |
711 if (dp >= 1000) return false; // stop deep recursion | |
712 visited_set(deep); | |
713 int shal_depth = depth(shallow); | |
714 assert(shal_depth <= depth(deep), "must be"); | |
715 for (DepPreds preds(deep, _dg); !preds.done(); preds.next()) { | |
716 Node* pred = preds.current(); | |
717 if (in_bb(pred) && !visited_test(pred)) { | |
718 if (shallow == pred) { | |
719 return false; | |
720 } | |
721 if (shal_depth < depth(pred) && !independent_path(shallow, pred, dp+1)) { | |
722 return false; | |
723 } | |
724 } | |
725 } | |
726 return true; | |
727 } | |
728 | |
729 //------------------------------set_alignment--------------------------- | |
730 void SuperWord::set_alignment(Node* s1, Node* s2, int align) { | |
731 set_alignment(s1, align); | |
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732 if (align == top_align || align == bottom_align) { |
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733 set_alignment(s2, align); |
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734 } else { |
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735 set_alignment(s2, align + data_size(s1)); |
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736 } |
0 | 737 } |
738 | |
739 //------------------------------data_size--------------------------- | |
740 int SuperWord::data_size(Node* s) { | |
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741 int bsize = type2aelembytes(velt_basic_type(s)); |
0 | 742 assert(bsize != 0, "valid size"); |
743 return bsize; | |
744 } | |
745 | |
746 //------------------------------extend_packlist--------------------------- | |
747 // Extend packset by following use->def and def->use links from pack members. | |
748 void SuperWord::extend_packlist() { | |
749 bool changed; | |
750 do { | |
751 changed = false; | |
752 for (int i = 0; i < _packset.length(); i++) { | |
753 Node_List* p = _packset.at(i); | |
754 changed |= follow_use_defs(p); | |
755 changed |= follow_def_uses(p); | |
756 } | |
757 } while (changed); | |
758 | |
759 #ifndef PRODUCT | |
760 if (TraceSuperWord) { | |
761 tty->print_cr("\nAfter extend_packlist"); | |
762 print_packset(); | |
763 } | |
764 #endif | |
765 } | |
766 | |
767 //------------------------------follow_use_defs--------------------------- | |
768 // Extend the packset by visiting operand definitions of nodes in pack p | |
769 bool SuperWord::follow_use_defs(Node_List* p) { | |
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770 assert(p->size() == 2, "just checking"); |
0 | 771 Node* s1 = p->at(0); |
772 Node* s2 = p->at(1); | |
773 assert(s1->req() == s2->req(), "just checking"); | |
774 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
775 | |
776 if (s1->is_Load()) return false; | |
777 | |
778 int align = alignment(s1); | |
779 bool changed = false; | |
780 int start = s1->is_Store() ? MemNode::ValueIn : 1; | |
781 int end = s1->is_Store() ? MemNode::ValueIn+1 : s1->req(); | |
782 for (int j = start; j < end; j++) { | |
783 Node* t1 = s1->in(j); | |
784 Node* t2 = s2->in(j); | |
785 if (!in_bb(t1) || !in_bb(t2)) | |
786 continue; | |
787 if (stmts_can_pack(t1, t2, align)) { | |
788 if (est_savings(t1, t2) >= 0) { | |
789 Node_List* pair = new Node_List(); | |
790 pair->push(t1); | |
791 pair->push(t2); | |
792 _packset.append(pair); | |
793 set_alignment(t1, t2, align); | |
794 changed = true; | |
795 } | |
796 } | |
797 } | |
798 return changed; | |
799 } | |
800 | |
801 //------------------------------follow_def_uses--------------------------- | |
802 // Extend the packset by visiting uses of nodes in pack p | |
803 bool SuperWord::follow_def_uses(Node_List* p) { | |
804 bool changed = false; | |
805 Node* s1 = p->at(0); | |
806 Node* s2 = p->at(1); | |
807 assert(p->size() == 2, "just checking"); | |
808 assert(s1->req() == s2->req(), "just checking"); | |
809 assert(alignment(s1) + data_size(s1) == alignment(s2), "just checking"); | |
810 | |
811 if (s1->is_Store()) return false; | |
812 | |
813 int align = alignment(s1); | |
814 int savings = -1; | |
815 Node* u1 = NULL; | |
816 Node* u2 = NULL; | |
817 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { | |
818 Node* t1 = s1->fast_out(i); | |
819 if (!in_bb(t1)) continue; | |
820 for (DUIterator_Fast jmax, j = s2->fast_outs(jmax); j < jmax; j++) { | |
821 Node* t2 = s2->fast_out(j); | |
822 if (!in_bb(t2)) continue; | |
823 if (!opnd_positions_match(s1, t1, s2, t2)) | |
824 continue; | |
825 if (stmts_can_pack(t1, t2, align)) { | |
826 int my_savings = est_savings(t1, t2); | |
827 if (my_savings > savings) { | |
828 savings = my_savings; | |
829 u1 = t1; | |
830 u2 = t2; | |
831 } | |
832 } | |
833 } | |
834 } | |
835 if (savings >= 0) { | |
836 Node_List* pair = new Node_List(); | |
837 pair->push(u1); | |
838 pair->push(u2); | |
839 _packset.append(pair); | |
840 set_alignment(u1, u2, align); | |
841 changed = true; | |
842 } | |
843 return changed; | |
844 } | |
845 | |
846 //---------------------------opnd_positions_match------------------------- | |
847 // Is the use of d1 in u1 at the same operand position as d2 in u2? | |
848 bool SuperWord::opnd_positions_match(Node* d1, Node* u1, Node* d2, Node* u2) { | |
849 uint ct = u1->req(); | |
850 if (ct != u2->req()) return false; | |
851 uint i1 = 0; | |
852 uint i2 = 0; | |
853 do { | |
854 for (i1++; i1 < ct; i1++) if (u1->in(i1) == d1) break; | |
855 for (i2++; i2 < ct; i2++) if (u2->in(i2) == d2) break; | |
856 if (i1 != i2) { | |
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857 if ((i1 == (3-i2)) && (u2->is_Add() || u2->is_Mul())) { |
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858 // Further analysis relies on operands position matching. |
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859 u2->swap_edges(i1, i2); |
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860 } else { |
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861 return false; |
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862 } |
0 | 863 } |
864 } while (i1 < ct); | |
865 return true; | |
866 } | |
867 | |
868 //------------------------------est_savings--------------------------- | |
869 // Estimate the savings from executing s1 and s2 as a pack | |
870 int SuperWord::est_savings(Node* s1, Node* s2) { | |
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871 int save_in = 2 - 1; // 2 operations per instruction in packed form |
0 | 872 |
873 // inputs | |
874 for (uint i = 1; i < s1->req(); i++) { | |
875 Node* x1 = s1->in(i); | |
876 Node* x2 = s2->in(i); | |
877 if (x1 != x2) { | |
878 if (are_adjacent_refs(x1, x2)) { | |
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879 save_in += adjacent_profit(x1, x2); |
0 | 880 } else if (!in_packset(x1, x2)) { |
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881 save_in -= pack_cost(2); |
0 | 882 } else { |
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883 save_in += unpack_cost(2); |
0 | 884 } |
885 } | |
886 } | |
887 | |
888 // uses of result | |
889 uint ct = 0; | |
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890 int save_use = 0; |
0 | 891 for (DUIterator_Fast imax, i = s1->fast_outs(imax); i < imax; i++) { |
892 Node* s1_use = s1->fast_out(i); | |
893 for (int j = 0; j < _packset.length(); j++) { | |
894 Node_List* p = _packset.at(j); | |
895 if (p->at(0) == s1_use) { | |
896 for (DUIterator_Fast kmax, k = s2->fast_outs(kmax); k < kmax; k++) { | |
897 Node* s2_use = s2->fast_out(k); | |
898 if (p->at(p->size()-1) == s2_use) { | |
899 ct++; | |
900 if (are_adjacent_refs(s1_use, s2_use)) { | |
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901 save_use += adjacent_profit(s1_use, s2_use); |
0 | 902 } |
903 } | |
904 } | |
905 } | |
906 } | |
907 } | |
908 | |
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909 if (ct < s1->outcnt()) save_use += unpack_cost(1); |
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910 if (ct < s2->outcnt()) save_use += unpack_cost(1); |
0 | 911 |
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912 return MAX2(save_in, save_use); |
0 | 913 } |
914 | |
915 //------------------------------costs--------------------------- | |
916 int SuperWord::adjacent_profit(Node* s1, Node* s2) { return 2; } | |
917 int SuperWord::pack_cost(int ct) { return ct; } | |
918 int SuperWord::unpack_cost(int ct) { return ct; } | |
919 | |
920 //------------------------------combine_packs--------------------------- | |
921 // Combine packs A and B with A.last == B.first into A.first..,A.last,B.second,..B.last | |
922 void SuperWord::combine_packs() { | |
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923 bool changed = true; |
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924 // Combine packs regardless max vector size. |
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925 while (changed) { |
0 | 926 changed = false; |
927 for (int i = 0; i < _packset.length(); i++) { | |
928 Node_List* p1 = _packset.at(i); | |
929 if (p1 == NULL) continue; | |
930 for (int j = 0; j < _packset.length(); j++) { | |
931 Node_List* p2 = _packset.at(j); | |
932 if (p2 == NULL) continue; | |
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933 if (i == j) continue; |
0 | 934 if (p1->at(p1->size()-1) == p2->at(0)) { |
935 for (uint k = 1; k < p2->size(); k++) { | |
936 p1->push(p2->at(k)); | |
937 } | |
938 _packset.at_put(j, NULL); | |
939 changed = true; | |
940 } | |
941 } | |
942 } | |
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943 } |
0 | 944 |
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945 // Split packs which have size greater then max vector size. |
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946 for (int i = 0; i < _packset.length(); i++) { |
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947 Node_List* p1 = _packset.at(i); |
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948 if (p1 != NULL) { |
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949 BasicType bt = velt_basic_type(p1->at(0)); |
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950 uint max_vlen = Matcher::max_vector_size(bt); // Max elements in vector |
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951 assert(is_power_of_2(max_vlen), "sanity"); |
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952 uint psize = p1->size(); |
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953 if (!is_power_of_2(psize)) { |
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954 // Skip pack which can't be vector. |
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955 // case1: for(...) { a[i] = i; } elements values are different (i+x) |
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956 // case2: for(...) { a[i] = b[i+1]; } can't align both, load and store |
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957 _packset.at_put(i, NULL); |
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958 continue; |
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959 } |
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960 if (psize > max_vlen) { |
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961 Node_List* pack = new Node_List(); |
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962 for (uint j = 0; j < psize; j++) { |
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963 pack->push(p1->at(j)); |
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964 if (pack->size() >= max_vlen) { |
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965 assert(is_power_of_2(pack->size()), "sanity"); |
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966 _packset.append(pack); |
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967 pack = new Node_List(); |
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968 } |
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969 } |
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970 _packset.at_put(i, NULL); |
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971 } |
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972 } |
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973 } |
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974 |
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975 // Compress list. |
0 | 976 for (int i = _packset.length() - 1; i >= 0; i--) { |
977 Node_List* p1 = _packset.at(i); | |
978 if (p1 == NULL) { | |
979 _packset.remove_at(i); | |
980 } | |
981 } | |
982 | |
983 #ifndef PRODUCT | |
984 if (TraceSuperWord) { | |
985 tty->print_cr("\nAfter combine_packs"); | |
986 print_packset(); | |
987 } | |
988 #endif | |
989 } | |
990 | |
991 //-----------------------------construct_my_pack_map-------------------------- | |
992 // Construct the map from nodes to packs. Only valid after the | |
993 // point where a node is only in one pack (after combine_packs). | |
994 void SuperWord::construct_my_pack_map() { | |
995 Node_List* rslt = NULL; | |
996 for (int i = 0; i < _packset.length(); i++) { | |
997 Node_List* p = _packset.at(i); | |
998 for (uint j = 0; j < p->size(); j++) { | |
999 Node* s = p->at(j); | |
1000 assert(my_pack(s) == NULL, "only in one pack"); | |
1001 set_my_pack(s, p); | |
1002 } | |
1003 } | |
1004 } | |
1005 | |
1006 //------------------------------filter_packs--------------------------- | |
1007 // Remove packs that are not implemented or not profitable. | |
1008 void SuperWord::filter_packs() { | |
1009 | |
1010 // Remove packs that are not implemented | |
1011 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1012 Node_List* pk = _packset.at(i); | |
1013 bool impl = implemented(pk); | |
1014 if (!impl) { | |
1015 #ifndef PRODUCT | |
1016 if (TraceSuperWord && Verbose) { | |
1017 tty->print_cr("Unimplemented"); | |
1018 pk->at(0)->dump(); | |
1019 } | |
1020 #endif | |
1021 remove_pack_at(i); | |
1022 } | |
1023 } | |
1024 | |
1025 // Remove packs that are not profitable | |
1026 bool changed; | |
1027 do { | |
1028 changed = false; | |
1029 for (int i = _packset.length() - 1; i >= 0; i--) { | |
1030 Node_List* pk = _packset.at(i); | |
1031 bool prof = profitable(pk); | |
1032 if (!prof) { | |
1033 #ifndef PRODUCT | |
1034 if (TraceSuperWord && Verbose) { | |
1035 tty->print_cr("Unprofitable"); | |
1036 pk->at(0)->dump(); | |
1037 } | |
1038 #endif | |
1039 remove_pack_at(i); | |
1040 changed = true; | |
1041 } | |
1042 } | |
1043 } while (changed); | |
1044 | |
1045 #ifndef PRODUCT | |
1046 if (TraceSuperWord) { | |
1047 tty->print_cr("\nAfter filter_packs"); | |
1048 print_packset(); | |
1049 tty->cr(); | |
1050 } | |
1051 #endif | |
1052 } | |
1053 | |
1054 //------------------------------implemented--------------------------- | |
1055 // Can code be generated for pack p? | |
1056 bool SuperWord::implemented(Node_List* p) { | |
1057 Node* p0 = p->at(0); | |
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1058 return VectorNode::implemented(p0->Opcode(), p->size(), velt_basic_type(p0)); |
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1059 } |
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1060 |
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1061 //------------------------------same_inputs-------------------------- |
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1062 // For pack p, are all idx operands the same? |
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1063 static bool same_inputs(Node_List* p, int idx) { |
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1064 Node* p0 = p->at(0); |
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1065 uint vlen = p->size(); |
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1066 Node* p0_def = p0->in(idx); |
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1067 for (uint i = 1; i < vlen; i++) { |
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1068 Node* pi = p->at(i); |
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1069 Node* pi_def = pi->in(idx); |
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1070 if (p0_def != pi_def) |
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1071 return false; |
6617 | 1072 } |
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1073 return true; |
0 | 1074 } |
1075 | |
1076 //------------------------------profitable--------------------------- | |
1077 // For pack p, are all operands and all uses (with in the block) vector? | |
1078 bool SuperWord::profitable(Node_List* p) { | |
1079 Node* p0 = p->at(0); | |
1080 uint start, end; | |
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1081 VectorNode::vector_operands(p0, &start, &end); |
0 | 1082 |
1083 // Return false if some input is not vector and inside block | |
1084 for (uint i = start; i < end; i++) { | |
1085 if (!is_vector_use(p0, i)) { | |
1086 // For now, return false if not scalar promotion case (inputs are the same.) | |
605 | 1087 // Later, implement PackNode and allow differing, non-vector inputs |
0 | 1088 // (maybe just the ones from outside the block.) |
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1089 if (!same_inputs(p, i)) { |
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1090 return false; |
0 | 1091 } |
1092 } | |
1093 } | |
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1094 if (VectorNode::is_shift(p0)) { |
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1095 // For now, return false if shift count is vector because |
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1096 // hw does not support it. |
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1097 if (is_vector_use(p0, 2)) |
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1098 return false; |
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1099 // For the same reason return false if different shift counts. |
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1100 if (!same_inputs(p, 2)) |
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1101 return false; |
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1102 } |
0 | 1103 if (!p0->is_Store()) { |
1104 // For now, return false if not all uses are vector. | |
1105 // Later, implement ExtractNode and allow non-vector uses (maybe | |
1106 // just the ones outside the block.) | |
1107 for (uint i = 0; i < p->size(); i++) { | |
1108 Node* def = p->at(i); | |
1109 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1110 Node* use = def->fast_out(j); | |
1111 for (uint k = 0; k < use->req(); k++) { | |
1112 Node* n = use->in(k); | |
1113 if (def == n) { | |
1114 if (!is_vector_use(use, k)) { | |
1115 return false; | |
1116 } | |
1117 } | |
1118 } | |
1119 } | |
1120 } | |
1121 } | |
1122 return true; | |
1123 } | |
1124 | |
1125 //------------------------------schedule--------------------------- | |
1126 // Adjust the memory graph for the packed operations | |
1127 void SuperWord::schedule() { | |
1128 | |
1129 // Co-locate in the memory graph the members of each memory pack | |
1130 for (int i = 0; i < _packset.length(); i++) { | |
1131 co_locate_pack(_packset.at(i)); | |
1132 } | |
1133 } | |
1134 | |
667 | 1135 //-------------------------------remove_and_insert------------------- |
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1136 // Remove "current" from its current position in the memory graph and insert |
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1137 // it after the appropriate insertion point (lip or uip). |
667 | 1138 void SuperWord::remove_and_insert(MemNode *current, MemNode *prev, MemNode *lip, |
1139 Node *uip, Unique_Node_List &sched_before) { | |
1140 Node* my_mem = current->in(MemNode::Memory); | |
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1141 bool sched_up = sched_before.member(current); |
667 | 1142 |
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1143 // remove current_store from its current position in the memmory graph |
667 | 1144 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1145 Node* use = current->out(i); | |
1146 if (use->is_Mem()) { | |
1147 assert(use->in(MemNode::Memory) == current, "must be"); | |
1148 if (use == prev) { // connect prev to my_mem | |
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1149 _igvn.replace_input_of(use, MemNode::Memory, my_mem); |
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1150 --i; //deleted this edge; rescan position |
667 | 1151 } else if (sched_before.member(use)) { |
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1152 if (!sched_up) { // Will be moved together with current |
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1153 _igvn.replace_input_of(use, MemNode::Memory, uip); |
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1154 --i; //deleted this edge; rescan position |
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1155 } |
667 | 1156 } else { |
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1157 if (sched_up) { // Will be moved together with current |
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1158 _igvn.replace_input_of(use, MemNode::Memory, lip); |
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1159 --i; //deleted this edge; rescan position |
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1160 } |
667 | 1161 } |
1162 } | |
1163 } | |
1164 | |
1165 Node *insert_pt = sched_up ? uip : lip; | |
1166 | |
1167 // all uses of insert_pt's memory state should use current's instead | |
1168 for (DUIterator i = insert_pt->outs(); insert_pt->has_out(i); i++) { | |
1169 Node* use = insert_pt->out(i); | |
1170 if (use->is_Mem()) { | |
1171 assert(use->in(MemNode::Memory) == insert_pt, "must be"); | |
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1172 _igvn.replace_input_of(use, MemNode::Memory, current); |
667 | 1173 --i; //deleted this edge; rescan position |
1174 } else if (!sched_up && use->is_Phi() && use->bottom_type() == Type::MEMORY) { | |
1175 uint pos; //lip (lower insert point) must be the last one in the memory slice | |
1176 for (pos=1; pos < use->req(); pos++) { | |
1177 if (use->in(pos) == insert_pt) break; | |
1178 } | |
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1179 _igvn.replace_input_of(use, pos, current); |
667 | 1180 --i; |
1181 } | |
1182 } | |
1183 | |
1184 //connect current to insert_pt | |
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1185 _igvn.replace_input_of(current, MemNode::Memory, insert_pt); |
667 | 1186 } |
1187 | |
1188 //------------------------------co_locate_pack---------------------------------- | |
1189 // To schedule a store pack, we need to move any sandwiched memory ops either before | |
1190 // or after the pack, based upon dependence information: | |
1191 // (1) If any store in the pack depends on the sandwiched memory op, the | |
1192 // sandwiched memory op must be scheduled BEFORE the pack; | |
1193 // (2) If a sandwiched memory op depends on any store in the pack, the | |
1194 // sandwiched memory op must be scheduled AFTER the pack; | |
1195 // (3) If a sandwiched memory op (say, memA) depends on another sandwiched | |
1196 // memory op (say memB), memB must be scheduled before memA. So, if memA is | |
1197 // scheduled before the pack, memB must also be scheduled before the pack; | |
1198 // (4) If there is no dependence restriction for a sandwiched memory op, we simply | |
1199 // schedule this store AFTER the pack | |
1200 // (5) We know there is no dependence cycle, so there in no other case; | |
1201 // (6) Finally, all memory ops in another single pack should be moved in the same direction. | |
1202 // | |
952 | 1203 // To schedule a load pack, we use the memory state of either the first or the last load in |
1204 // the pack, based on the dependence constraint. | |
0 | 1205 void SuperWord::co_locate_pack(Node_List* pk) { |
1206 if (pk->at(0)->is_Store()) { | |
1207 MemNode* first = executed_first(pk)->as_Mem(); | |
1208 MemNode* last = executed_last(pk)->as_Mem(); | |
667 | 1209 Unique_Node_List schedule_before_pack; |
1210 Unique_Node_List memops; | |
1211 | |
0 | 1212 MemNode* current = last->in(MemNode::Memory)->as_Mem(); |
667 | 1213 MemNode* previous = last; |
0 | 1214 while (true) { |
1215 assert(in_bb(current), "stay in block"); | |
667 | 1216 memops.push(previous); |
1217 for (DUIterator i = current->outs(); current->has_out(i); i++) { | |
1218 Node* use = current->out(i); | |
1219 if (use->is_Mem() && use != previous) | |
1220 memops.push(use); | |
1221 } | |
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1222 if (current == first) break; |
667 | 1223 previous = current; |
1224 current = current->in(MemNode::Memory)->as_Mem(); | |
1225 } | |
1226 | |
1227 // determine which memory operations should be scheduled before the pack | |
1228 for (uint i = 1; i < memops.size(); i++) { | |
1229 Node *s1 = memops.at(i); | |
1230 if (!in_pack(s1, pk) && !schedule_before_pack.member(s1)) { | |
1231 for (uint j = 0; j< i; j++) { | |
1232 Node *s2 = memops.at(j); | |
1233 if (!independent(s1, s2)) { | |
1234 if (in_pack(s2, pk) || schedule_before_pack.member(s2)) { | |
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1235 schedule_before_pack.push(s1); // s1 must be scheduled before |
667 | 1236 Node_List* mem_pk = my_pack(s1); |
1237 if (mem_pk != NULL) { | |
1238 for (uint ii = 0; ii < mem_pk->size(); ii++) { | |
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1239 Node* s = mem_pk->at(ii); // follow partner |
667 | 1240 if (memops.member(s) && !schedule_before_pack.member(s)) |
1241 schedule_before_pack.push(s); | |
1242 } | |
1243 } | |
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1244 break; |
667 | 1245 } |
1246 } | |
1247 } | |
1248 } | |
1249 } | |
1250 | |
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1251 Node* upper_insert_pt = first->in(MemNode::Memory); |
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1252 // Following code moves loads connected to upper_insert_pt below aliased stores. |
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1253 // Collect such loads here and reconnect them back to upper_insert_pt later. |
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1254 memops.clear(); |
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1255 for (DUIterator i = upper_insert_pt->outs(); upper_insert_pt->has_out(i); i++) { |
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1256 Node* use = upper_insert_pt->out(i); |
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1257 if (!use->is_Store()) |
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1258 memops.push(use); |
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1259 } |
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1260 |
667 | 1261 MemNode* lower_insert_pt = last; |
1262 previous = last; //previous store in pk | |
1263 current = last->in(MemNode::Memory)->as_Mem(); | |
1264 | |
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1265 // start scheduling from "last" to "first" |
667 | 1266 while (true) { |
1267 assert(in_bb(current), "stay in block"); | |
1268 assert(in_pack(previous, pk), "previous stays in pack"); | |
0 | 1269 Node* my_mem = current->in(MemNode::Memory); |
667 | 1270 |
0 | 1271 if (in_pack(current, pk)) { |
667 | 1272 // Forward users of my memory state (except "previous) to my input memory state |
0 | 1273 for (DUIterator i = current->outs(); current->has_out(i); i++) { |
1274 Node* use = current->out(i); | |
667 | 1275 if (use->is_Mem() && use != previous) { |
0 | 1276 assert(use->in(MemNode::Memory) == current, "must be"); |
667 | 1277 if (schedule_before_pack.member(use)) { |
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1278 _igvn.replace_input_of(use, MemNode::Memory, upper_insert_pt); |
667 | 1279 } else { |
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1280 _igvn.replace_input_of(use, MemNode::Memory, lower_insert_pt); |
667 | 1281 } |
0 | 1282 --i; // deleted this edge; rescan position |
1283 } | |
1284 } | |
667 | 1285 previous = current; |
1286 } else { // !in_pack(current, pk) ==> a sandwiched store | |
1287 remove_and_insert(current, previous, lower_insert_pt, upper_insert_pt, schedule_before_pack); | |
0 | 1288 } |
667 | 1289 |
0 | 1290 if (current == first) break; |
1291 current = my_mem->as_Mem(); | |
667 | 1292 } // end while |
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1293 |
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1294 // Reconnect loads back to upper_insert_pt. |
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1295 for (uint i = 0; i < memops.size(); i++) { |
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1296 Node *ld = memops.at(i); |
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1297 if (ld->in(MemNode::Memory) != upper_insert_pt) { |
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1298 _igvn.replace_input_of(ld, MemNode::Memory, upper_insert_pt); |
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1299 } |
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1300 } |
667 | 1301 } else if (pk->at(0)->is_Load()) { //load |
952 | 1302 // all loads in the pack should have the same memory state. By default, |
1303 // we use the memory state of the last load. However, if any load could | |
1304 // not be moved down due to the dependence constraint, we use the memory | |
1305 // state of the first load. | |
1306 Node* last_mem = executed_last(pk)->in(MemNode::Memory); | |
1307 Node* first_mem = executed_first(pk)->in(MemNode::Memory); | |
1308 bool schedule_last = true; | |
1309 for (uint i = 0; i < pk->size(); i++) { | |
1310 Node* ld = pk->at(i); | |
1311 for (Node* current = last_mem; current != ld->in(MemNode::Memory); | |
1312 current=current->in(MemNode::Memory)) { | |
1313 assert(current != first_mem, "corrupted memory graph"); | |
1314 if(current->is_Mem() && !independent(current, ld)){ | |
1315 schedule_last = false; // a later store depends on this load | |
1316 break; | |
1317 } | |
1318 } | |
1319 } | |
1320 | |
1321 Node* mem_input = schedule_last ? last_mem : first_mem; | |
1322 _igvn.hash_delete(mem_input); | |
1323 // Give each load the same memory state | |
0 | 1324 for (uint i = 0; i < pk->size(); i++) { |
1325 LoadNode* ld = pk->at(i)->as_Load(); | |
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1326 _igvn.replace_input_of(ld, MemNode::Memory, mem_input); |
0 | 1327 } |
1328 } | |
1329 } | |
1330 | |
1331 //------------------------------output--------------------------- | |
1332 // Convert packs into vector node operations | |
1333 void SuperWord::output() { | |
1334 if (_packset.length() == 0) return; | |
1335 | |
2445 | 1336 #ifndef PRODUCT |
1337 if (TraceLoopOpts) { | |
1338 tty->print("SuperWord "); | |
1339 lpt()->dump_head(); | |
1340 } | |
1341 #endif | |
1342 | |
0 | 1343 // MUST ENSURE main loop's initial value is properly aligned: |
1344 // (iv_initial_value + min_iv_offset) % vector_width_in_bytes() == 0 | |
1345 | |
1346 align_initial_loop_index(align_to_ref()); | |
1347 | |
1348 // Insert extract (unpack) operations for scalar uses | |
1349 for (int i = 0; i < _packset.length(); i++) { | |
1350 insert_extracts(_packset.at(i)); | |
1351 } | |
1352 | |
1353 for (int i = 0; i < _block.length(); i++) { | |
1354 Node* n = _block.at(i); | |
1355 Node_List* p = my_pack(n); | |
1356 if (p && n == executed_last(p)) { | |
1357 uint vlen = p->size(); | |
1358 Node* vn = NULL; | |
1359 Node* low_adr = p->at(0); | |
1360 Node* first = executed_first(p); | |
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1361 int opc = n->Opcode(); |
0 | 1362 if (n->is_Load()) { |
1363 Node* ctl = n->in(MemNode::Control); | |
1364 Node* mem = first->in(MemNode::Memory); | |
1365 Node* adr = low_adr->in(MemNode::Address); | |
1366 const TypePtr* atyp = n->adr_type(); | |
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1367 vn = LoadVectorNode::make(_phase->C, opc, ctl, mem, adr, atyp, vlen, velt_basic_type(n)); |
0 | 1368 } else if (n->is_Store()) { |
1369 // Promote value to be stored to vector | |
3842 | 1370 Node* val = vector_opd(p, MemNode::ValueIn); |
0 | 1371 Node* ctl = n->in(MemNode::Control); |
1372 Node* mem = first->in(MemNode::Memory); | |
1373 Node* adr = low_adr->in(MemNode::Address); | |
1374 const TypePtr* atyp = n->adr_type(); | |
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1375 vn = StoreVectorNode::make(_phase->C, opc, ctl, mem, adr, atyp, val, vlen); |
0 | 1376 } else if (n->req() == 3) { |
1377 // Promote operands to vector | |
1378 Node* in1 = vector_opd(p, 1); | |
1379 Node* in2 = vector_opd(p, 2); | |
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1380 if (VectorNode::is_invariant_vector(in1) && (n->is_Add() || n->is_Mul())) { |
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1381 // Move invariant vector input into second position to avoid register spilling. |
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1382 Node* tmp = in1; |
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1383 in1 = in2; |
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1384 in2 = tmp; |
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1385 } |
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1386 vn = VectorNode::make(_phase->C, opc, in1, in2, vlen, velt_basic_type(n)); |
0 | 1387 } else { |
1388 ShouldNotReachHere(); | |
1389 } | |
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1390 assert(vn != NULL, "sanity"); |
0 | 1391 _phase->_igvn.register_new_node_with_optimizer(vn); |
1392 _phase->set_ctrl(vn, _phase->get_ctrl(p->at(0))); | |
1393 for (uint j = 0; j < p->size(); j++) { | |
1394 Node* pm = p->at(j); | |
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1395 _igvn.replace_node(pm, vn); |
0 | 1396 } |
1397 _igvn._worklist.push(vn); | |
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1398 #ifdef ASSERT |
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1399 if (TraceNewVectors) { |
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1400 tty->print("new Vector node: "); |
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1401 vn->dump(); |
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1402 } |
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1403 #endif |
0 | 1404 } |
1405 } | |
1406 } | |
1407 | |
1408 //------------------------------vector_opd--------------------------- | |
1409 // Create a vector operand for the nodes in pack p for operand: in(opd_idx) | |
3842 | 1410 Node* SuperWord::vector_opd(Node_List* p, int opd_idx) { |
0 | 1411 Node* p0 = p->at(0); |
1412 uint vlen = p->size(); | |
1413 Node* opd = p0->in(opd_idx); | |
1414 | |
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1415 if (same_inputs(p, opd_idx)) { |
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1416 if (opd->is_Vector() || opd->is_LoadVector()) { |
6617 | 1417 assert(((opd_idx != 2) || !VectorNode::is_shift(p0)), "shift's count can't be vector"); |
3842 | 1418 return opd; // input is matching vector |
0 | 1419 } |
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1420 if ((opd_idx == 2) && VectorNode::is_shift(p0)) { |
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1421 // No vector is needed for shift count. |
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1422 // Vector instructions do not mask shift count, do it here. |
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1423 Compile* C = _phase->C; |
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1424 Node* cnt = opd; |
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1425 juint mask = (p0->bottom_type() == TypeInt::INT) ? (BitsPerInt - 1) : (BitsPerLong - 1); |
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1426 const TypeInt* t = opd->find_int_type(); |
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1427 if (t != NULL && t->is_con()) { |
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1428 juint shift = t->get_con(); |
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1429 if (shift > mask) { // Unsigned cmp |
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1430 cnt = ConNode::make(C, TypeInt::make(shift & mask)); |
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1431 } |
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1432 } else { |
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1433 if (t == NULL || t->_lo < 0 || t->_hi > (int)mask) { |
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1434 cnt = ConNode::make(C, TypeInt::make(mask)); |
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1435 _phase->_igvn.register_new_node_with_optimizer(cnt); |
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1436 cnt = new (C, 3) AndINode(opd, cnt); |
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1437 _phase->_igvn.register_new_node_with_optimizer(cnt); |
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1438 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); |
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1439 } |
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1440 assert(opd->bottom_type()->isa_int(), "int type only"); |
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1441 // Move non constant shift count into XMM register. |
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1442 cnt = new (_phase->C, 2) MoveI2FNode(cnt); |
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1443 } |
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1444 if (cnt != opd) { |
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1445 _phase->_igvn.register_new_node_with_optimizer(cnt); |
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1446 _phase->set_ctrl(cnt, _phase->get_ctrl(opd)); |
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1447 } |
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1448 return cnt; |
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1449 } |
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1450 assert(!opd->is_StoreVector(), "such vector is not expected here"); |
6045 | 1451 // Convert scalar input to vector with the same number of elements as |
1452 // p0's vector. Use p0's type because size of operand's container in | |
1453 // vector should match p0's size regardless operand's size. | |
1454 const Type* p0_t = velt_type(p0); | |
1455 VectorNode* vn = VectorNode::scalar2vector(_phase->C, opd, vlen, p0_t); | |
0 | 1456 |
1457 _phase->_igvn.register_new_node_with_optimizer(vn); | |
1458 _phase->set_ctrl(vn, _phase->get_ctrl(opd)); | |
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1459 #ifdef ASSERT |
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1460 if (TraceNewVectors) { |
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1461 tty->print("new Vector node: "); |
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1462 vn->dump(); |
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1463 } |
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1464 #endif |
0 | 1465 return vn; |
1466 } | |
1467 | |
1468 // Insert pack operation | |
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1469 BasicType bt = velt_basic_type(p0); |
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1470 PackNode* pk = PackNode::make(_phase->C, opd, vlen, bt); |
6045 | 1471 DEBUG_ONLY( const BasicType opd_bt = opd->bottom_type()->basic_type(); ) |
0 | 1472 |
1473 for (uint i = 1; i < vlen; i++) { | |
1474 Node* pi = p->at(i); | |
1475 Node* in = pi->in(opd_idx); | |
1476 assert(my_pack(in) == NULL, "Should already have been unpacked"); | |
6045 | 1477 assert(opd_bt == in->bottom_type()->basic_type(), "all same type"); |
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1478 pk->add_opd(in); |
0 | 1479 } |
1480 _phase->_igvn.register_new_node_with_optimizer(pk); | |
1481 _phase->set_ctrl(pk, _phase->get_ctrl(opd)); | |
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1482 #ifdef ASSERT |
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1483 if (TraceNewVectors) { |
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1484 tty->print("new Vector node: "); |
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1485 pk->dump(); |
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1486 } |
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1487 #endif |
0 | 1488 return pk; |
1489 } | |
1490 | |
1491 //------------------------------insert_extracts--------------------------- | |
1492 // If a use of pack p is not a vector use, then replace the | |
1493 // use with an extract operation. | |
1494 void SuperWord::insert_extracts(Node_List* p) { | |
1495 if (p->at(0)->is_Store()) return; | |
1496 assert(_n_idx_list.is_empty(), "empty (node,index) list"); | |
1497 | |
1498 // Inspect each use of each pack member. For each use that is | |
1499 // not a vector use, replace the use with an extract operation. | |
1500 | |
1501 for (uint i = 0; i < p->size(); i++) { | |
1502 Node* def = p->at(i); | |
1503 for (DUIterator_Fast jmax, j = def->fast_outs(jmax); j < jmax; j++) { | |
1504 Node* use = def->fast_out(j); | |
1505 for (uint k = 0; k < use->req(); k++) { | |
1506 Node* n = use->in(k); | |
1507 if (def == n) { | |
1508 if (!is_vector_use(use, k)) { | |
1509 _n_idx_list.push(use, k); | |
1510 } | |
1511 } | |
1512 } | |
1513 } | |
1514 } | |
1515 | |
1516 while (_n_idx_list.is_nonempty()) { | |
1517 Node* use = _n_idx_list.node(); | |
1518 int idx = _n_idx_list.index(); | |
1519 _n_idx_list.pop(); | |
1520 Node* def = use->in(idx); | |
1521 | |
1522 // Insert extract operation | |
1523 _igvn.hash_delete(def); | |
1524 int def_pos = alignment(def) / data_size(def); | |
1525 | |
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1526 Node* ex = ExtractNode::make(_phase->C, def, def_pos, velt_basic_type(def)); |
0 | 1527 _phase->_igvn.register_new_node_with_optimizer(ex); |
1528 _phase->set_ctrl(ex, _phase->get_ctrl(def)); | |
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1529 _igvn.replace_input_of(use, idx, ex); |
0 | 1530 _igvn._worklist.push(def); |
1531 | |
1532 bb_insert_after(ex, bb_idx(def)); | |
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1533 set_velt_type(ex, velt_type(def)); |
0 | 1534 } |
1535 } | |
1536 | |
1537 //------------------------------is_vector_use--------------------------- | |
1538 // Is use->in(u_idx) a vector use? | |
1539 bool SuperWord::is_vector_use(Node* use, int u_idx) { | |
1540 Node_List* u_pk = my_pack(use); | |
1541 if (u_pk == NULL) return false; | |
1542 Node* def = use->in(u_idx); | |
1543 Node_List* d_pk = my_pack(def); | |
1544 if (d_pk == NULL) { | |
1545 // check for scalar promotion | |
1546 Node* n = u_pk->at(0)->in(u_idx); | |
1547 for (uint i = 1; i < u_pk->size(); i++) { | |
1548 if (u_pk->at(i)->in(u_idx) != n) return false; | |
1549 } | |
1550 return true; | |
1551 } | |
1552 if (u_pk->size() != d_pk->size()) | |
1553 return false; | |
1554 for (uint i = 0; i < u_pk->size(); i++) { | |
1555 Node* ui = u_pk->at(i); | |
1556 Node* di = d_pk->at(i); | |
1557 if (ui->in(u_idx) != di || alignment(ui) != alignment(di)) | |
1558 return false; | |
1559 } | |
1560 return true; | |
1561 } | |
1562 | |
1563 //------------------------------construct_bb--------------------------- | |
1564 // Construct reverse postorder list of block members | |
1565 void SuperWord::construct_bb() { | |
1566 Node* entry = bb(); | |
1567 | |
1568 assert(_stk.length() == 0, "stk is empty"); | |
1569 assert(_block.length() == 0, "block is empty"); | |
1570 assert(_data_entry.length() == 0, "data_entry is empty"); | |
1571 assert(_mem_slice_head.length() == 0, "mem_slice_head is empty"); | |
1572 assert(_mem_slice_tail.length() == 0, "mem_slice_tail is empty"); | |
1573 | |
1574 // Find non-control nodes with no inputs from within block, | |
1575 // create a temporary map from node _idx to bb_idx for use | |
1576 // by the visited and post_visited sets, | |
1577 // and count number of nodes in block. | |
1578 int bb_ct = 0; | |
1579 for (uint i = 0; i < lpt()->_body.size(); i++ ) { | |
1580 Node *n = lpt()->_body.at(i); | |
1581 set_bb_idx(n, i); // Create a temporary map | |
1582 if (in_bb(n)) { | |
1583 bb_ct++; | |
1584 if (!n->is_CFG()) { | |
1585 bool found = false; | |
1586 for (uint j = 0; j < n->req(); j++) { | |
1587 Node* def = n->in(j); | |
1588 if (def && in_bb(def)) { | |
1589 found = true; | |
1590 break; | |
1591 } | |
1592 } | |
1593 if (!found) { | |
1594 assert(n != entry, "can't be entry"); | |
1595 _data_entry.push(n); | |
1596 } | |
1597 } | |
1598 } | |
1599 } | |
1600 | |
1601 // Find memory slices (head and tail) | |
1602 for (DUIterator_Fast imax, i = lp()->fast_outs(imax); i < imax; i++) { | |
1603 Node *n = lp()->fast_out(i); | |
1604 if (in_bb(n) && (n->is_Phi() && n->bottom_type() == Type::MEMORY)) { | |
1605 Node* n_tail = n->in(LoopNode::LoopBackControl); | |
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1606 if (n_tail != n->in(LoopNode::EntryControl)) { |
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1607 _mem_slice_head.push(n); |
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1608 _mem_slice_tail.push(n_tail); |
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1609 } |
0 | 1610 } |
1611 } | |
1612 | |
1613 // Create an RPO list of nodes in block | |
1614 | |
1615 visited_clear(); | |
1616 post_visited_clear(); | |
1617 | |
1618 // Push all non-control nodes with no inputs from within block, then control entry | |
1619 for (int j = 0; j < _data_entry.length(); j++) { | |
1620 Node* n = _data_entry.at(j); | |
1621 visited_set(n); | |
1622 _stk.push(n); | |
1623 } | |
1624 visited_set(entry); | |
1625 _stk.push(entry); | |
1626 | |
1627 // Do a depth first walk over out edges | |
1628 int rpo_idx = bb_ct - 1; | |
1629 int size; | |
1630 while ((size = _stk.length()) > 0) { | |
1631 Node* n = _stk.top(); // Leave node on stack | |
1632 if (!visited_test_set(n)) { | |
1633 // forward arc in graph | |
1634 } else if (!post_visited_test(n)) { | |
1635 // cross or back arc | |
1636 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { | |
1637 Node *use = n->fast_out(i); | |
1638 if (in_bb(use) && !visited_test(use) && | |
1639 // Don't go around backedge | |
1640 (!use->is_Phi() || n == entry)) { | |
1641 _stk.push(use); | |
1642 } | |
1643 } | |
1644 if (_stk.length() == size) { | |
1645 // There were no additional uses, post visit node now | |
1646 _stk.pop(); // Remove node from stack | |
1647 assert(rpo_idx >= 0, ""); | |
1648 _block.at_put_grow(rpo_idx, n); | |
1649 rpo_idx--; | |
1650 post_visited_set(n); | |
1651 assert(rpo_idx >= 0 || _stk.is_empty(), ""); | |
1652 } | |
1653 } else { | |
1654 _stk.pop(); // Remove post-visited node from stack | |
1655 } | |
1656 } | |
1657 | |
1658 // Create real map of block indices for nodes | |
1659 for (int j = 0; j < _block.length(); j++) { | |
1660 Node* n = _block.at(j); | |
1661 set_bb_idx(n, j); | |
1662 } | |
1663 | |
1664 initialize_bb(); // Ensure extra info is allocated. | |
1665 | |
1666 #ifndef PRODUCT | |
1667 if (TraceSuperWord) { | |
1668 print_bb(); | |
1669 tty->print_cr("\ndata entry nodes: %s", _data_entry.length() > 0 ? "" : "NONE"); | |
1670 for (int m = 0; m < _data_entry.length(); m++) { | |
1671 tty->print("%3d ", m); | |
1672 _data_entry.at(m)->dump(); | |
1673 } | |
1674 tty->print_cr("\nmemory slices: %s", _mem_slice_head.length() > 0 ? "" : "NONE"); | |
1675 for (int m = 0; m < _mem_slice_head.length(); m++) { | |
1676 tty->print("%3d ", m); _mem_slice_head.at(m)->dump(); | |
1677 tty->print(" "); _mem_slice_tail.at(m)->dump(); | |
1678 } | |
1679 } | |
1680 #endif | |
1681 assert(rpo_idx == -1 && bb_ct == _block.length(), "all block members found"); | |
1682 } | |
1683 | |
1684 //------------------------------initialize_bb--------------------------- | |
1685 // Initialize per node info | |
1686 void SuperWord::initialize_bb() { | |
1687 Node* last = _block.at(_block.length() - 1); | |
1688 grow_node_info(bb_idx(last)); | |
1689 } | |
1690 | |
1691 //------------------------------bb_insert_after--------------------------- | |
1692 // Insert n into block after pos | |
1693 void SuperWord::bb_insert_after(Node* n, int pos) { | |
1694 int n_pos = pos + 1; | |
1695 // Make room | |
1696 for (int i = _block.length() - 1; i >= n_pos; i--) { | |
1697 _block.at_put_grow(i+1, _block.at(i)); | |
1698 } | |
1699 for (int j = _node_info.length() - 1; j >= n_pos; j--) { | |
1700 _node_info.at_put_grow(j+1, _node_info.at(j)); | |
1701 } | |
1702 // Set value | |
1703 _block.at_put_grow(n_pos, n); | |
1704 _node_info.at_put_grow(n_pos, SWNodeInfo::initial); | |
1705 // Adjust map from node->_idx to _block index | |
1706 for (int i = n_pos; i < _block.length(); i++) { | |
1707 set_bb_idx(_block.at(i), i); | |
1708 } | |
1709 } | |
1710 | |
1711 //------------------------------compute_max_depth--------------------------- | |
1712 // Compute max depth for expressions from beginning of block | |
1713 // Use to prune search paths during test for independence. | |
1714 void SuperWord::compute_max_depth() { | |
1715 int ct = 0; | |
1716 bool again; | |
1717 do { | |
1718 again = false; | |
1719 for (int i = 0; i < _block.length(); i++) { | |
1720 Node* n = _block.at(i); | |
1721 if (!n->is_Phi()) { | |
1722 int d_orig = depth(n); | |
1723 int d_in = 0; | |
1724 for (DepPreds preds(n, _dg); !preds.done(); preds.next()) { | |
1725 Node* pred = preds.current(); | |
1726 if (in_bb(pred)) { | |
1727 d_in = MAX2(d_in, depth(pred)); | |
1728 } | |
1729 } | |
1730 if (d_in + 1 != d_orig) { | |
1731 set_depth(n, d_in + 1); | |
1732 again = true; | |
1733 } | |
1734 } | |
1735 } | |
1736 ct++; | |
1737 } while (again); | |
1738 #ifndef PRODUCT | |
1739 if (TraceSuperWord && Verbose) | |
1740 tty->print_cr("compute_max_depth iterated: %d times", ct); | |
1741 #endif | |
1742 } | |
1743 | |
1744 //-------------------------compute_vector_element_type----------------------- | |
1745 // Compute necessary vector element type for expressions | |
1746 // This propagates backwards a narrower integer type when the | |
1747 // upper bits of the value are not needed. | |
1748 // Example: char a,b,c; a = b + c; | |
1749 // Normally the type of the add is integer, but for packed character | |
1750 // operations the type of the add needs to be char. | |
1751 void SuperWord::compute_vector_element_type() { | |
1752 #ifndef PRODUCT | |
1753 if (TraceSuperWord && Verbose) | |
1754 tty->print_cr("\ncompute_velt_type:"); | |
1755 #endif | |
1756 | |
1757 // Initial type | |
1758 for (int i = 0; i < _block.length(); i++) { | |
1759 Node* n = _block.at(i); | |
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1760 set_velt_type(n, container_type(n)); |
0 | 1761 } |
1762 | |
1763 // Propagate narrowed type backwards through operations | |
1764 // that don't depend on higher order bits | |
1765 for (int i = _block.length() - 1; i >= 0; i--) { | |
1766 Node* n = _block.at(i); | |
1767 // Only integer types need be examined | |
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1768 const Type* vt = velt_type(n); |
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1769 if (vt->basic_type() == T_INT) { |
0 | 1770 uint start, end; |
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1771 VectorNode::vector_operands(n, &start, &end); |
0 | 1772 const Type* vt = velt_type(n); |
1773 | |
1774 for (uint j = start; j < end; j++) { | |
1775 Node* in = n->in(j); | |
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1776 // Don't propagate through a memory |
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1777 if (!in->is_Mem() && in_bb(in) && velt_type(in)->basic_type() == T_INT && |
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1778 data_size(n) < data_size(in)) { |
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1779 bool same_type = true; |
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1780 for (DUIterator_Fast kmax, k = in->fast_outs(kmax); k < kmax; k++) { |
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1781 Node *use = in->fast_out(k); |
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1782 if (!in_bb(use) || !same_velt_type(use, n)) { |
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1783 same_type = false; |
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1784 break; |
0 | 1785 } |
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1786 } |
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1787 if (same_type) { |
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1788 set_velt_type(in, vt); |
0 | 1789 } |
1790 } | |
1791 } | |
1792 } | |
1793 } | |
1794 #ifndef PRODUCT | |
1795 if (TraceSuperWord && Verbose) { | |
1796 for (int i = 0; i < _block.length(); i++) { | |
1797 Node* n = _block.at(i); | |
1798 velt_type(n)->dump(); | |
1799 tty->print("\t"); | |
1800 n->dump(); | |
1801 } | |
1802 } | |
1803 #endif | |
1804 } | |
1805 | |
1806 //------------------------------memory_alignment--------------------------- | |
1807 // Alignment within a vector memory reference | |
1808 int SuperWord::memory_alignment(MemNode* s, int iv_adjust_in_bytes) { | |
1809 SWPointer p(s, this); | |
1810 if (!p.valid()) { | |
1811 return bottom_align; | |
1812 } | |
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1813 int vw = vector_width_in_bytes(s); |
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1814 if (vw < 2) { |
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1815 return bottom_align; // No vectors for this type |
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1816 } |
0 | 1817 int offset = p.offset_in_bytes(); |
1818 offset += iv_adjust_in_bytes; | |
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1819 int off_rem = offset % vw; |
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1820 int off_mod = off_rem >= 0 ? off_rem : off_rem + vw; |
0 | 1821 return off_mod; |
1822 } | |
1823 | |
1824 //---------------------------container_type--------------------------- | |
1825 // Smallest type containing range of values | |
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1826 const Type* SuperWord::container_type(Node* n) { |
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1827 if (n->is_Mem()) { |
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1828 return Type::get_const_basic_type(n->as_Mem()->memory_type()); |
0 | 1829 } |
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1830 const Type* t = _igvn.type(n); |
0 | 1831 if (t->basic_type() == T_INT) { |
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1832 // A narrow type of arithmetic operations will be determined by |
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1833 // propagating the type of memory operations. |
0 | 1834 return TypeInt::INT; |
1835 } | |
1836 return t; | |
1837 } | |
1838 | |
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1839 bool SuperWord::same_velt_type(Node* n1, Node* n2) { |
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1840 const Type* vt1 = velt_type(n1); |
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1841 const Type* vt2 = velt_type(n1); |
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1842 if (vt1->basic_type() == T_INT && vt2->basic_type() == T_INT) { |
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1843 // Compare vectors element sizes for integer types. |
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1844 return data_size(n1) == data_size(n2); |
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1845 } |
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1846 return vt1 == vt2; |
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1847 } |
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1848 |
0 | 1849 //------------------------------in_packset--------------------------- |
1850 // Are s1 and s2 in a pack pair and ordered as s1,s2? | |
1851 bool SuperWord::in_packset(Node* s1, Node* s2) { | |
1852 for (int i = 0; i < _packset.length(); i++) { | |
1853 Node_List* p = _packset.at(i); | |
1854 assert(p->size() == 2, "must be"); | |
1855 if (p->at(0) == s1 && p->at(p->size()-1) == s2) { | |
1856 return true; | |
1857 } | |
1858 } | |
1859 return false; | |
1860 } | |
1861 | |
1862 //------------------------------in_pack--------------------------- | |
1863 // Is s in pack p? | |
1864 Node_List* SuperWord::in_pack(Node* s, Node_List* p) { | |
1865 for (uint i = 0; i < p->size(); i++) { | |
1866 if (p->at(i) == s) { | |
1867 return p; | |
1868 } | |
1869 } | |
1870 return NULL; | |
1871 } | |
1872 | |
1873 //------------------------------remove_pack_at--------------------------- | |
1874 // Remove the pack at position pos in the packset | |
1875 void SuperWord::remove_pack_at(int pos) { | |
1876 Node_List* p = _packset.at(pos); | |
1877 for (uint i = 0; i < p->size(); i++) { | |
1878 Node* s = p->at(i); | |
1879 set_my_pack(s, NULL); | |
1880 } | |
1881 _packset.remove_at(pos); | |
1882 } | |
1883 | |
1884 //------------------------------executed_first--------------------------- | |
1885 // Return the node executed first in pack p. Uses the RPO block list | |
1886 // to determine order. | |
1887 Node* SuperWord::executed_first(Node_List* p) { | |
1888 Node* n = p->at(0); | |
1889 int n_rpo = bb_idx(n); | |
1890 for (uint i = 1; i < p->size(); i++) { | |
1891 Node* s = p->at(i); | |
1892 int s_rpo = bb_idx(s); | |
1893 if (s_rpo < n_rpo) { | |
1894 n = s; | |
1895 n_rpo = s_rpo; | |
1896 } | |
1897 } | |
1898 return n; | |
1899 } | |
1900 | |
1901 //------------------------------executed_last--------------------------- | |
1902 // Return the node executed last in pack p. | |
1903 Node* SuperWord::executed_last(Node_List* p) { | |
1904 Node* n = p->at(0); | |
1905 int n_rpo = bb_idx(n); | |
1906 for (uint i = 1; i < p->size(); i++) { | |
1907 Node* s = p->at(i); | |
1908 int s_rpo = bb_idx(s); | |
1909 if (s_rpo > n_rpo) { | |
1910 n = s; | |
1911 n_rpo = s_rpo; | |
1912 } | |
1913 } | |
1914 return n; | |
1915 } | |
1916 | |
1917 //----------------------------align_initial_loop_index--------------------------- | |
1918 // Adjust pre-loop limit so that in main loop, a load/store reference | |
1919 // to align_to_ref will be a position zero in the vector. | |
1920 // (iv + k) mod vector_align == 0 | |
1921 void SuperWord::align_initial_loop_index(MemNode* align_to_ref) { | |
1922 CountedLoopNode *main_head = lp()->as_CountedLoop(); | |
1923 assert(main_head->is_main_loop(), ""); | |
1924 CountedLoopEndNode* pre_end = get_pre_loop_end(main_head); | |
1925 assert(pre_end != NULL, ""); | |
1926 Node *pre_opaq1 = pre_end->limit(); | |
1927 assert(pre_opaq1->Opcode() == Op_Opaque1, ""); | |
1928 Opaque1Node *pre_opaq = (Opaque1Node*)pre_opaq1; | |
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1929 Node *lim0 = pre_opaq->in(1); |
0 | 1930 |
1931 // Where we put new limit calculations | |
1932 Node *pre_ctrl = pre_end->loopnode()->in(LoopNode::EntryControl); | |
1933 | |
1934 // Ensure the original loop limit is available from the | |
1935 // pre-loop Opaque1 node. | |
1936 Node *orig_limit = pre_opaq->original_loop_limit(); | |
1937 assert(orig_limit != NULL && _igvn.type(orig_limit) != Type::TOP, ""); | |
1938 | |
1939 SWPointer align_to_ref_p(align_to_ref, this); | |
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1940 assert(align_to_ref_p.valid(), "sanity"); |
0 | 1941 |
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1942 // Given: |
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1943 // lim0 == original pre loop limit |
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1944 // V == v_align (power of 2) |
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1945 // invar == extra invariant piece of the address expression |
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1946 // e == offset [ +/- invar ] |
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1947 // |
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1948 // When reassociating expressions involving '%' the basic rules are: |
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1949 // (a - b) % k == 0 => a % k == b % k |
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1950 // and: |
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1951 // (a + b) % k == 0 => a % k == (k - b) % k |
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1952 // |
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1953 // For stride > 0 && scale > 0, |
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1954 // Derive the new pre-loop limit "lim" such that the two constraints: |
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1955 // (1) lim = lim0 + N (where N is some positive integer < V) |
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1956 // (2) (e + lim) % V == 0 |
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1957 // are true. |
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1958 // |
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1959 // Substituting (1) into (2), |
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1960 // (e + lim0 + N) % V == 0 |
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1961 // solve for N: |
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1962 // N = (V - (e + lim0)) % V |
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1963 // substitute back into (1), so that new limit |
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1964 // lim = lim0 + (V - (e + lim0)) % V |
0 | 1965 // |
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1966 // For stride > 0 && scale < 0 |
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1967 // Constraints: |
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1968 // lim = lim0 + N |
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1969 // (e - lim) % V == 0 |
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1970 // Solving for lim: |
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1971 // (e - lim0 - N) % V == 0 |
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1972 // N = (e - lim0) % V |
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1973 // lim = lim0 + (e - lim0) % V |
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1974 // |
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1975 // For stride < 0 && scale > 0 |
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1976 // Constraints: |
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1977 // lim = lim0 - N |
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1978 // (e + lim) % V == 0 |
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1979 // Solving for lim: |
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1980 // (e + lim0 - N) % V == 0 |
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1981 // N = (e + lim0) % V |
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1982 // lim = lim0 - (e + lim0) % V |
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1983 // |
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1984 // For stride < 0 && scale < 0 |
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1985 // Constraints: |
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1986 // lim = lim0 - N |
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1987 // (e - lim) % V == 0 |
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1988 // Solving for lim: |
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1989 // (e - lim0 + N) % V == 0 |
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1990 // N = (V - (e - lim0)) % V |
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1991 // lim = lim0 - (V - (e - lim0)) % V |
0 | 1992 |
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1993 int vw = vector_width_in_bytes(align_to_ref); |
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1994 int stride = iv_stride(); |
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1995 int scale = align_to_ref_p.scale_in_bytes(); |
0 | 1996 int elt_size = align_to_ref_p.memory_size(); |
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1997 int v_align = vw / elt_size; |
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1998 assert(v_align > 1, "sanity"); |
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1999 int offset = align_to_ref_p.offset_in_bytes() / elt_size; |
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2000 Node *offsn = _igvn.intcon(offset); |
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2001 |
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2002 Node *e = offsn; |
0 | 2003 if (align_to_ref_p.invar() != NULL) { |
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2004 // incorporate any extra invariant piece producing (offset +/- invar) >>> log2(elt) |
0 | 2005 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
2006 Node* aref = new (_phase->C, 3) URShiftINode(align_to_ref_p.invar(), log2_elt); | |
2007 _phase->_igvn.register_new_node_with_optimizer(aref); | |
2008 _phase->set_ctrl(aref, pre_ctrl); | |
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2009 if (align_to_ref_p.negate_invar()) { |
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2010 e = new (_phase->C, 3) SubINode(e, aref); |
0 | 2011 } else { |
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2012 e = new (_phase->C, 3) AddINode(e, aref); |
0 | 2013 } |
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2014 _phase->_igvn.register_new_node_with_optimizer(e); |
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2015 _phase->set_ctrl(e, pre_ctrl); |
0 | 2016 } |
6179
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2017 if (vw > ObjectAlignmentInBytes) { |
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2018 // incorporate base e +/- base && Mask >>> log2(elt) |
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2019 Node* xbase = new(_phase->C, 2) CastP2XNode(NULL, align_to_ref_p.base()); |
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2020 _phase->_igvn.register_new_node_with_optimizer(xbase); |
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2021 #ifdef _LP64 |
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2022 xbase = new (_phase->C, 2) ConvL2INode(xbase); |
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2023 _phase->_igvn.register_new_node_with_optimizer(xbase); |
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2024 #endif |
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2025 Node* mask = _igvn.intcon(vw-1); |
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2026 Node* masked_xbase = new (_phase->C, 3) AndINode(xbase, mask); |
6179
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2027 _phase->_igvn.register_new_node_with_optimizer(masked_xbase); |
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2028 Node* log2_elt = _igvn.intcon(exact_log2(elt_size)); |
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2029 Node* bref = new (_phase->C, 3) URShiftINode(masked_xbase, log2_elt); |
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2030 _phase->_igvn.register_new_node_with_optimizer(bref); |
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2031 _phase->set_ctrl(bref, pre_ctrl); |
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2032 e = new (_phase->C, 3) AddINode(e, bref); |
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2033 _phase->_igvn.register_new_node_with_optimizer(e); |
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2034 _phase->set_ctrl(e, pre_ctrl); |
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2035 } |
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2036 |
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2037 // compute e +/- lim0 |
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2038 if (scale < 0) { |
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2039 e = new (_phase->C, 3) SubINode(e, lim0); |
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2040 } else { |
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2041 e = new (_phase->C, 3) AddINode(e, lim0); |
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2042 } |
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2043 _phase->_igvn.register_new_node_with_optimizer(e); |
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2044 _phase->set_ctrl(e, pre_ctrl); |
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2045 |
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2046 if (stride * scale > 0) { |
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2047 // compute V - (e +/- lim0) |
0 | 2048 Node* va = _igvn.intcon(v_align); |
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2049 e = new (_phase->C, 3) SubINode(va, e); |
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2050 _phase->_igvn.register_new_node_with_optimizer(e); |
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2051 _phase->set_ctrl(e, pre_ctrl); |
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2052 } |
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2053 // compute N = (exp) % V |
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2054 Node* va_msk = _igvn.intcon(v_align - 1); |
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2055 Node* N = new (_phase->C, 3) AndINode(e, va_msk); |
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2056 _phase->_igvn.register_new_node_with_optimizer(N); |
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2057 _phase->set_ctrl(N, pre_ctrl); |
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2058 |
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2059 // substitute back into (1), so that new limit |
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2060 // lim = lim0 + N |
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2061 Node* lim; |
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2062 if (stride < 0) { |
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2063 lim = new (_phase->C, 3) SubINode(lim0, N); |
0 | 2064 } else { |
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2065 lim = new (_phase->C, 3) AddINode(lim0, N); |
0 | 2066 } |
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2067 _phase->_igvn.register_new_node_with_optimizer(lim); |
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2068 _phase->set_ctrl(lim, pre_ctrl); |
0 | 2069 Node* constrained = |
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2070 (stride > 0) ? (Node*) new (_phase->C,3) MinINode(lim, orig_limit) |
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2071 : (Node*) new (_phase->C,3) MaxINode(lim, orig_limit); |
0 | 2072 _phase->_igvn.register_new_node_with_optimizer(constrained); |
2073 _phase->set_ctrl(constrained, pre_ctrl); | |
2074 _igvn.hash_delete(pre_opaq); | |
2075 pre_opaq->set_req(1, constrained); | |
2076 } | |
2077 | |
2078 //----------------------------get_pre_loop_end--------------------------- | |
2079 // Find pre loop end from main loop. Returns null if none. | |
2080 CountedLoopEndNode* SuperWord::get_pre_loop_end(CountedLoopNode *cl) { | |
2081 Node *ctrl = cl->in(LoopNode::EntryControl); | |
2082 if (!ctrl->is_IfTrue() && !ctrl->is_IfFalse()) return NULL; | |
2083 Node *iffm = ctrl->in(0); | |
2084 if (!iffm->is_If()) return NULL; | |
2085 Node *p_f = iffm->in(0); | |
2086 if (!p_f->is_IfFalse()) return NULL; | |
2087 if (!p_f->in(0)->is_CountedLoopEnd()) return NULL; | |
2088 CountedLoopEndNode *pre_end = p_f->in(0)->as_CountedLoopEnd(); | |
2089 if (!pre_end->loopnode()->is_pre_loop()) return NULL; | |
2090 return pre_end; | |
2091 } | |
2092 | |
2093 | |
2094 //------------------------------init--------------------------- | |
2095 void SuperWord::init() { | |
2096 _dg.init(); | |
2097 _packset.clear(); | |
2098 _disjoint_ptrs.clear(); | |
2099 _block.clear(); | |
2100 _data_entry.clear(); | |
2101 _mem_slice_head.clear(); | |
2102 _mem_slice_tail.clear(); | |
2103 _node_info.clear(); | |
2104 _align_to_ref = NULL; | |
2105 _lpt = NULL; | |
2106 _lp = NULL; | |
2107 _bb = NULL; | |
2108 _iv = NULL; | |
2109 } | |
2110 | |
2111 //------------------------------print_packset--------------------------- | |
2112 void SuperWord::print_packset() { | |
2113 #ifndef PRODUCT | |
2114 tty->print_cr("packset"); | |
2115 for (int i = 0; i < _packset.length(); i++) { | |
2116 tty->print_cr("Pack: %d", i); | |
2117 Node_List* p = _packset.at(i); | |
2118 print_pack(p); | |
2119 } | |
2120 #endif | |
2121 } | |
2122 | |
2123 //------------------------------print_pack--------------------------- | |
2124 void SuperWord::print_pack(Node_List* p) { | |
2125 for (uint i = 0; i < p->size(); i++) { | |
2126 print_stmt(p->at(i)); | |
2127 } | |
2128 } | |
2129 | |
2130 //------------------------------print_bb--------------------------- | |
2131 void SuperWord::print_bb() { | |
2132 #ifndef PRODUCT | |
2133 tty->print_cr("\nBlock"); | |
2134 for (int i = 0; i < _block.length(); i++) { | |
2135 Node* n = _block.at(i); | |
2136 tty->print("%d ", i); | |
2137 if (n) { | |
2138 n->dump(); | |
2139 } | |
2140 } | |
2141 #endif | |
2142 } | |
2143 | |
2144 //------------------------------print_stmt--------------------------- | |
2145 void SuperWord::print_stmt(Node* s) { | |
2146 #ifndef PRODUCT | |
2147 tty->print(" align: %d \t", alignment(s)); | |
2148 s->dump(); | |
2149 #endif | |
2150 } | |
2151 | |
2152 //------------------------------blank--------------------------- | |
2153 char* SuperWord::blank(uint depth) { | |
2154 static char blanks[101]; | |
2155 assert(depth < 101, "too deep"); | |
2156 for (uint i = 0; i < depth; i++) blanks[i] = ' '; | |
2157 blanks[depth] = '\0'; | |
2158 return blanks; | |
2159 } | |
2160 | |
2161 | |
2162 //==============================SWPointer=========================== | |
2163 | |
2164 //----------------------------SWPointer------------------------ | |
2165 SWPointer::SWPointer(MemNode* mem, SuperWord* slp) : | |
2166 _mem(mem), _slp(slp), _base(NULL), _adr(NULL), | |
2167 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) { | |
2168 | |
2169 Node* adr = mem->in(MemNode::Address); | |
2170 if (!adr->is_AddP()) { | |
2171 assert(!valid(), "too complex"); | |
2172 return; | |
2173 } | |
2174 // Match AddP(base, AddP(ptr, k*iv [+ invariant]), constant) | |
2175 Node* base = adr->in(AddPNode::Base); | |
1058
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2176 //unsafe reference could not be aligned appropriately without runtime checking |
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2177 if (base == NULL || base->bottom_type() == Type::TOP) { |
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2178 assert(!valid(), "unsafe access"); |
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2179 return; |
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2180 } |
0 | 2181 for (int i = 0; i < 3; i++) { |
2182 if (!scaled_iv_plus_offset(adr->in(AddPNode::Offset))) { | |
2183 assert(!valid(), "too complex"); | |
2184 return; | |
2185 } | |
2186 adr = adr->in(AddPNode::Address); | |
2187 if (base == adr || !adr->is_AddP()) { | |
2188 break; // stop looking at addp's | |
2189 } | |
2190 } | |
2191 _base = base; | |
2192 _adr = adr; | |
2193 assert(valid(), "Usable"); | |
2194 } | |
2195 | |
2196 // Following is used to create a temporary object during | |
2197 // the pattern match of an address expression. | |
2198 SWPointer::SWPointer(SWPointer* p) : | |
2199 _mem(p->_mem), _slp(p->_slp), _base(NULL), _adr(NULL), | |
2200 _scale(0), _offset(0), _invar(NULL), _negate_invar(false) {} | |
2201 | |
2202 //------------------------scaled_iv_plus_offset-------------------- | |
2203 // Match: k*iv + offset | |
2204 // where: k is a constant that maybe zero, and | |
2205 // offset is (k2 [+/- invariant]) where k2 maybe zero and invariant is optional | |
2206 bool SWPointer::scaled_iv_plus_offset(Node* n) { | |
2207 if (scaled_iv(n)) { | |
2208 return true; | |
2209 } | |
2210 if (offset_plus_k(n)) { | |
2211 return true; | |
2212 } | |
2213 int opc = n->Opcode(); | |
2214 if (opc == Op_AddI) { | |
2215 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2))) { | |
2216 return true; | |
2217 } | |
2218 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2219 return true; | |
2220 } | |
2221 } else if (opc == Op_SubI) { | |
2222 if (scaled_iv(n->in(1)) && offset_plus_k(n->in(2), true)) { | |
2223 return true; | |
2224 } | |
2225 if (scaled_iv(n->in(2)) && offset_plus_k(n->in(1))) { | |
2226 _scale *= -1; | |
2227 return true; | |
2228 } | |
2229 } | |
2230 return false; | |
2231 } | |
2232 | |
2233 //----------------------------scaled_iv------------------------ | |
2234 // Match: k*iv where k is a constant that's not zero | |
2235 bool SWPointer::scaled_iv(Node* n) { | |
2236 if (_scale != 0) { | |
2237 return false; // already found a scale | |
2238 } | |
2239 if (n == iv()) { | |
2240 _scale = 1; | |
2241 return true; | |
2242 } | |
2243 int opc = n->Opcode(); | |
2244 if (opc == Op_MulI) { | |
2245 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2246 _scale = n->in(2)->get_int(); | |
2247 return true; | |
2248 } else if (n->in(2) == iv() && n->in(1)->is_Con()) { | |
2249 _scale = n->in(1)->get_int(); | |
2250 return true; | |
2251 } | |
2252 } else if (opc == Op_LShiftI) { | |
2253 if (n->in(1) == iv() && n->in(2)->is_Con()) { | |
2254 _scale = 1 << n->in(2)->get_int(); | |
2255 return true; | |
2256 } | |
2257 } else if (opc == Op_ConvI2L) { | |
2258 if (scaled_iv_plus_offset(n->in(1))) { | |
2259 return true; | |
2260 } | |
2261 } else if (opc == Op_LShiftL) { | |
2262 if (!has_iv() && _invar == NULL) { | |
2263 // Need to preserve the current _offset value, so | |
2264 // create a temporary object for this expression subtree. | |
2265 // Hacky, so should re-engineer the address pattern match. | |
2266 SWPointer tmp(this); | |
2267 if (tmp.scaled_iv_plus_offset(n->in(1))) { | |
2268 if (tmp._invar == NULL) { | |
2269 int mult = 1 << n->in(2)->get_int(); | |
2270 _scale = tmp._scale * mult; | |
2271 _offset += tmp._offset * mult; | |
2272 return true; | |
2273 } | |
2274 } | |
2275 } | |
2276 } | |
2277 return false; | |
2278 } | |
2279 | |
2280 //----------------------------offset_plus_k------------------------ | |
2281 // Match: offset is (k [+/- invariant]) | |
2282 // where k maybe zero and invariant is optional, but not both. | |
2283 bool SWPointer::offset_plus_k(Node* n, bool negate) { | |
2284 int opc = n->Opcode(); | |
2285 if (opc == Op_ConI) { | |
2286 _offset += negate ? -(n->get_int()) : n->get_int(); | |
2287 return true; | |
2288 } else if (opc == Op_ConL) { | |
2289 // Okay if value fits into an int | |
2290 const TypeLong* t = n->find_long_type(); | |
2291 if (t->higher_equal(TypeLong::INT)) { | |
2292 jlong loff = n->get_long(); | |
2293 jint off = (jint)loff; | |
2294 _offset += negate ? -off : loff; | |
2295 return true; | |
2296 } | |
2297 return false; | |
2298 } | |
2299 if (_invar != NULL) return false; // already have an invariant | |
2300 if (opc == Op_AddI) { | |
2301 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2302 _negate_invar = negate; | |
2303 _invar = n->in(1); | |
2304 _offset += negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2305 return true; | |
2306 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2307 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2308 _negate_invar = negate; | |
2309 _invar = n->in(2); | |
2310 return true; | |
2311 } | |
2312 } | |
2313 if (opc == Op_SubI) { | |
2314 if (n->in(2)->is_Con() && invariant(n->in(1))) { | |
2315 _negate_invar = negate; | |
2316 _invar = n->in(1); | |
2317 _offset += !negate ? -(n->in(2)->get_int()) : n->in(2)->get_int(); | |
2318 return true; | |
2319 } else if (n->in(1)->is_Con() && invariant(n->in(2))) { | |
2320 _offset += negate ? -(n->in(1)->get_int()) : n->in(1)->get_int(); | |
2321 _negate_invar = !negate; | |
2322 _invar = n->in(2); | |
2323 return true; | |
2324 } | |
2325 } | |
2326 if (invariant(n)) { | |
2327 _negate_invar = negate; | |
2328 _invar = n; | |
2329 return true; | |
2330 } | |
2331 return false; | |
2332 } | |
2333 | |
2334 //----------------------------print------------------------ | |
2335 void SWPointer::print() { | |
2336 #ifndef PRODUCT | |
2337 tty->print("base: %d adr: %d scale: %d offset: %d invar: %c%d\n", | |
2338 _base != NULL ? _base->_idx : 0, | |
2339 _adr != NULL ? _adr->_idx : 0, | |
2340 _scale, _offset, | |
2341 _negate_invar?'-':'+', | |
2342 _invar != NULL ? _invar->_idx : 0); | |
2343 #endif | |
2344 } | |
2345 | |
2346 // ========================= OrderedPair ===================== | |
2347 | |
2348 const OrderedPair OrderedPair::initial; | |
2349 | |
2350 // ========================= SWNodeInfo ===================== | |
2351 | |
2352 const SWNodeInfo SWNodeInfo::initial; | |
2353 | |
2354 | |
2355 // ============================ DepGraph =========================== | |
2356 | |
2357 //------------------------------make_node--------------------------- | |
2358 // Make a new dependence graph node for an ideal node. | |
2359 DepMem* DepGraph::make_node(Node* node) { | |
2360 DepMem* m = new (_arena) DepMem(node); | |
2361 if (node != NULL) { | |
2362 assert(_map.at_grow(node->_idx) == NULL, "one init only"); | |
2363 _map.at_put_grow(node->_idx, m); | |
2364 } | |
2365 return m; | |
2366 } | |
2367 | |
2368 //------------------------------make_edge--------------------------- | |
2369 // Make a new dependence graph edge from dpred -> dsucc | |
2370 DepEdge* DepGraph::make_edge(DepMem* dpred, DepMem* dsucc) { | |
2371 DepEdge* e = new (_arena) DepEdge(dpred, dsucc, dsucc->in_head(), dpred->out_head()); | |
2372 dpred->set_out_head(e); | |
2373 dsucc->set_in_head(e); | |
2374 return e; | |
2375 } | |
2376 | |
2377 // ========================== DepMem ======================== | |
2378 | |
2379 //------------------------------in_cnt--------------------------- | |
2380 int DepMem::in_cnt() { | |
2381 int ct = 0; | |
2382 for (DepEdge* e = _in_head; e != NULL; e = e->next_in()) ct++; | |
2383 return ct; | |
2384 } | |
2385 | |
2386 //------------------------------out_cnt--------------------------- | |
2387 int DepMem::out_cnt() { | |
2388 int ct = 0; | |
2389 for (DepEdge* e = _out_head; e != NULL; e = e->next_out()) ct++; | |
2390 return ct; | |
2391 } | |
2392 | |
2393 //------------------------------print----------------------------- | |
2394 void DepMem::print() { | |
2395 #ifndef PRODUCT | |
2396 tty->print(" DepNode %d (", _node->_idx); | |
2397 for (DepEdge* p = _in_head; p != NULL; p = p->next_in()) { | |
2398 Node* pred = p->pred()->node(); | |
2399 tty->print(" %d", pred != NULL ? pred->_idx : 0); | |
2400 } | |
2401 tty->print(") ["); | |
2402 for (DepEdge* s = _out_head; s != NULL; s = s->next_out()) { | |
2403 Node* succ = s->succ()->node(); | |
2404 tty->print(" %d", succ != NULL ? succ->_idx : 0); | |
2405 } | |
2406 tty->print_cr(" ]"); | |
2407 #endif | |
2408 } | |
2409 | |
2410 // =========================== DepEdge ========================= | |
2411 | |
2412 //------------------------------DepPreds--------------------------- | |
2413 void DepEdge::print() { | |
2414 #ifndef PRODUCT | |
2415 tty->print_cr("DepEdge: %d [ %d ]", _pred->node()->_idx, _succ->node()->_idx); | |
2416 #endif | |
2417 } | |
2418 | |
2419 // =========================== DepPreds ========================= | |
2420 // Iterator over predecessor edges in the dependence graph. | |
2421 | |
2422 //------------------------------DepPreds--------------------------- | |
2423 DepPreds::DepPreds(Node* n, DepGraph& dg) { | |
2424 _n = n; | |
2425 _done = false; | |
2426 if (_n->is_Store() || _n->is_Load()) { | |
2427 _next_idx = MemNode::Address; | |
2428 _end_idx = n->req(); | |
2429 _dep_next = dg.dep(_n)->in_head(); | |
2430 } else if (_n->is_Mem()) { | |
2431 _next_idx = 0; | |
2432 _end_idx = 0; | |
2433 _dep_next = dg.dep(_n)->in_head(); | |
2434 } else { | |
2435 _next_idx = 1; | |
2436 _end_idx = _n->req(); | |
2437 _dep_next = NULL; | |
2438 } | |
2439 next(); | |
2440 } | |
2441 | |
2442 //------------------------------next--------------------------- | |
2443 void DepPreds::next() { | |
2444 if (_dep_next != NULL) { | |
2445 _current = _dep_next->pred()->node(); | |
2446 _dep_next = _dep_next->next_in(); | |
2447 } else if (_next_idx < _end_idx) { | |
2448 _current = _n->in(_next_idx++); | |
2449 } else { | |
2450 _done = true; | |
2451 } | |
2452 } | |
2453 | |
2454 // =========================== DepSuccs ========================= | |
2455 // Iterator over successor edges in the dependence graph. | |
2456 | |
2457 //------------------------------DepSuccs--------------------------- | |
2458 DepSuccs::DepSuccs(Node* n, DepGraph& dg) { | |
2459 _n = n; | |
2460 _done = false; | |
2461 if (_n->is_Load()) { | |
2462 _next_idx = 0; | |
2463 _end_idx = _n->outcnt(); | |
2464 _dep_next = dg.dep(_n)->out_head(); | |
2465 } else if (_n->is_Mem() || _n->is_Phi() && _n->bottom_type() == Type::MEMORY) { | |
2466 _next_idx = 0; | |
2467 _end_idx = 0; | |
2468 _dep_next = dg.dep(_n)->out_head(); | |
2469 } else { | |
2470 _next_idx = 0; | |
2471 _end_idx = _n->outcnt(); | |
2472 _dep_next = NULL; | |
2473 } | |
2474 next(); | |
2475 } | |
2476 | |
2477 //-------------------------------next--------------------------- | |
2478 void DepSuccs::next() { | |
2479 if (_dep_next != NULL) { | |
2480 _current = _dep_next->succ()->node(); | |
2481 _dep_next = _dep_next->next_out(); | |
2482 } else if (_next_idx < _end_idx) { | |
2483 _current = _n->raw_out(_next_idx++); | |
2484 } else { | |
2485 _done = true; | |
2486 } | |
2487 } |