Mercurial > hg > truffle
annotate src/share/vm/opto/chaitin.hpp @ 14714:b602356a9cfc
additional canonicalizers for accesses and value nodes (improves number of implicit null checks)
author | Lukas Stadler <lukas.stadler@oracle.com> |
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date | Thu, 20 Mar 2014 17:15:36 +0100 |
parents | 04e7587c97dc |
children | 4ca6dc0799b6 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_CHAITIN_HPP |
26 #define SHARE_VM_OPTO_CHAITIN_HPP | |
27 | |
28 #include "code/vmreg.hpp" | |
29 #include "libadt/port.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "opto/connode.hpp" | |
32 #include "opto/live.hpp" | |
33 #include "opto/matcher.hpp" | |
34 #include "opto/phase.hpp" | |
35 #include "opto/regalloc.hpp" | |
36 #include "opto/regmask.hpp" | |
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37 #include "opto/machnode.hpp" |
1972 | 38 |
0 | 39 class LoopTree; |
40 class Matcher; | |
41 class PhaseCFG; | |
42 class PhaseLive; | |
43 class PhaseRegAlloc; | |
44 class PhaseChaitin; | |
45 | |
46 #define OPTO_DEBUG_SPLIT_FREQ BLOCK_FREQUENCY(0.001) | |
47 #define OPTO_LRG_HIGH_FREQ BLOCK_FREQUENCY(0.25) | |
48 | |
49 //------------------------------LRG-------------------------------------------- | |
50 // Live-RanGe structure. | |
51 class LRG : public ResourceObj { | |
3939 | 52 friend class VMStructs; |
0 | 53 public: |
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54 static const uint AllStack_size = 0xFFFFF; // This mask size is used to tell that the mask of this LRG supports stack positions |
0 | 55 enum { SPILL_REG=29999 }; // Register number of a spilled LRG |
56 | |
57 double _cost; // 2 for loads/1 for stores times block freq | |
58 double _area; // Sum of all simultaneously live values | |
59 double score() const; // Compute score from cost and area | |
60 double _maxfreq; // Maximum frequency of any def or use | |
61 | |
62 Node *_def; // Check for multi-def live ranges | |
63 #ifndef PRODUCT | |
64 GrowableArray<Node*>* _defs; | |
65 #endif | |
66 | |
67 uint _risk_bias; // Index of LRG which we want to avoid color | |
68 uint _copy_bias; // Index of LRG which we want to share color | |
69 | |
70 uint _next; // Index of next LRG in linked list | |
71 uint _prev; // Index of prev LRG in linked list | |
72 private: | |
73 uint _reg; // Chosen register; undefined if mask is plural | |
74 public: | |
75 // Return chosen register for this LRG. Error if the LRG is not bound to | |
76 // a single register. | |
77 OptoReg::Name reg() const { return OptoReg::Name(_reg); } | |
78 void set_reg( OptoReg::Name r ) { _reg = r; } | |
79 | |
80 private: | |
81 uint _eff_degree; // Effective degree: Sum of neighbors _num_regs | |
82 public: | |
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83 int degree() const { assert( _degree_valid , "" ); return _eff_degree; } |
0 | 84 // Degree starts not valid and any change to the IFG neighbor |
85 // set makes it not valid. | |
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86 void set_degree( uint degree ) { |
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87 _eff_degree = degree; |
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88 debug_only(_degree_valid = 1;) |
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89 assert(!_mask.is_AllStack() || (_mask.is_AllStack() && lo_degree()), "_eff_degree can't be bigger than AllStack_size - _num_regs if the mask supports stack registers"); |
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90 } |
0 | 91 // Made a change that hammered degree |
92 void invalid_degree() { debug_only(_degree_valid=0;) } | |
93 // Incrementally modify degree. If it was correct, it should remain correct | |
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94 void inc_degree( uint mod ) { |
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95 _eff_degree += mod; |
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96 assert(!_mask.is_AllStack() || (_mask.is_AllStack() && lo_degree()), "_eff_degree can't be bigger than AllStack_size - _num_regs if the mask supports stack registers"); |
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97 } |
0 | 98 // Compute the degree between 2 live ranges |
99 int compute_degree( LRG &l ) const; | |
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100 bool mask_is_nonempty_and_up() const { |
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101 return mask().is_UP() && mask_size(); |
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102 } |
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103 bool is_float_or_vector() const { |
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104 return _is_float || _is_vector; |
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105 } |
0 | 106 |
107 private: | |
108 RegMask _mask; // Allowed registers for this LRG | |
109 uint _mask_size; // cache of _mask.Size(); | |
110 public: | |
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111 int compute_mask_size() const { return _mask.is_AllStack() ? AllStack_size : _mask.Size(); } |
0 | 112 void set_mask_size( int size ) { |
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113 assert((size == (int)AllStack_size) || (size == (int)_mask.Size()), ""); |
0 | 114 _mask_size = size; |
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115 #ifdef ASSERT |
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116 _msize_valid=1; |
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117 if (_is_vector) { |
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118 assert(!_fat_proj, "sanity"); |
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119 _mask.verify_sets(_num_regs); |
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120 } else if (_num_regs == 2 && !_fat_proj) { |
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121 _mask.verify_pairs(); |
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122 } |
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123 #endif |
0 | 124 } |
125 void compute_set_mask_size() { set_mask_size(compute_mask_size()); } | |
126 int mask_size() const { assert( _msize_valid, "mask size not valid" ); | |
127 return _mask_size; } | |
128 // Get the last mask size computed, even if it does not match the | |
129 // count of bits in the current mask. | |
130 int get_invalid_mask_size() const { return _mask_size; } | |
131 const RegMask &mask() const { return _mask; } | |
132 void set_mask( const RegMask &rm ) { _mask = rm; debug_only(_msize_valid=0;)} | |
133 void AND( const RegMask &rm ) { _mask.AND(rm); debug_only(_msize_valid=0;)} | |
134 void SUBTRACT( const RegMask &rm ) { _mask.SUBTRACT(rm); debug_only(_msize_valid=0;)} | |
135 void Clear() { _mask.Clear() ; debug_only(_msize_valid=1); _mask_size = 0; } | |
136 void Set_All() { _mask.Set_All(); debug_only(_msize_valid=1); _mask_size = RegMask::CHUNK_SIZE; } | |
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137 |
0 | 138 void Insert( OptoReg::Name reg ) { _mask.Insert(reg); debug_only(_msize_valid=0;) } |
139 void Remove( OptoReg::Name reg ) { _mask.Remove(reg); debug_only(_msize_valid=0;) } | |
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140 void clear_to_pairs() { _mask.clear_to_pairs(); debug_only(_msize_valid=0;) } |
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141 void clear_to_sets() { _mask.clear_to_sets(_num_regs); debug_only(_msize_valid=0;) } |
0 | 142 |
143 // Number of registers this live range uses when it colors | |
144 private: | |
145 uint8 _num_regs; // 2 for Longs and Doubles, 1 for all else | |
146 // except _num_regs is kill count for fat_proj | |
147 public: | |
148 int num_regs() const { return _num_regs; } | |
149 void set_num_regs( int reg ) { assert( _num_regs == reg || !_num_regs, "" ); _num_regs = reg; } | |
150 | |
151 private: | |
152 // Number of physical registers this live range uses when it colors | |
153 // Architecture and register-set dependent | |
154 uint8 _reg_pressure; | |
155 public: | |
156 void set_reg_pressure(int i) { _reg_pressure = i; } | |
157 int reg_pressure() const { return _reg_pressure; } | |
158 | |
159 // How much 'wiggle room' does this live range have? | |
160 // How many color choices can it make (scaled by _num_regs)? | |
161 int degrees_of_freedom() const { return mask_size() - _num_regs; } | |
162 // Bound LRGs have ZERO degrees of freedom. We also count | |
163 // must_spill as bound. | |
164 bool is_bound () const { return _is_bound; } | |
165 // Negative degrees-of-freedom; even with no neighbors this | |
166 // live range must spill. | |
167 bool not_free() const { return degrees_of_freedom() < 0; } | |
168 // Is this live range of "low-degree"? Trivially colorable? | |
169 bool lo_degree () const { return degree() <= degrees_of_freedom(); } | |
170 // Is this live range just barely "low-degree"? Trivially colorable? | |
171 bool just_lo_degree () const { return degree() == degrees_of_freedom(); } | |
172 | |
173 uint _is_oop:1, // Live-range holds an oop | |
174 _is_float:1, // True if in float registers | |
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175 _is_vector:1, // True if in vector registers |
0 | 176 _was_spilled1:1, // True if prior spilling on def |
177 _was_spilled2:1, // True if twice prior spilling on def | |
178 _is_bound:1, // live range starts life with no | |
179 // degrees of freedom. | |
180 _direct_conflict:1, // True if def and use registers in conflict | |
181 _must_spill:1, // live range has lost all degrees of freedom | |
182 // If _fat_proj is set, live range does NOT require aligned, adjacent | |
183 // registers and has NO interferences. | |
184 // If _fat_proj is clear, live range requires num_regs() to be a power of | |
185 // 2, and it requires registers to form an aligned, adjacent set. | |
186 _fat_proj:1, // | |
187 _was_lo:1, // Was lo-degree prior to coalesce | |
188 _msize_valid:1, // _mask_size cache valid | |
189 _degree_valid:1, // _degree cache valid | |
190 _has_copy:1, // Adjacent to some copy instruction | |
191 _at_risk:1; // Simplify says this guy is at risk to spill | |
192 | |
193 | |
194 // Alive if non-zero, dead if zero | |
195 bool alive() const { return _def != NULL; } | |
295
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196 bool is_multidef() const { return _def == NodeSentinel; } |
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197 bool is_singledef() const { return _def != NodeSentinel; } |
0 | 198 |
199 #ifndef PRODUCT | |
200 void dump( ) const; | |
201 #endif | |
202 }; | |
203 | |
204 //------------------------------IFG-------------------------------------------- | |
205 // InterFerence Graph | |
206 // An undirected graph implementation. Created with a fixed number of | |
207 // vertices. Edges can be added & tested. Vertices can be removed, then | |
208 // added back later with all edges intact. Can add edges between one vertex | |
209 // and a list of other vertices. Can union vertices (and their edges) | |
210 // together. The IFG needs to be really really fast, and also fairly | |
211 // abstract! It needs abstraction so I can fiddle with the implementation to | |
212 // get even more speed. | |
213 class PhaseIFG : public Phase { | |
3939 | 214 friend class VMStructs; |
0 | 215 // Current implementation: a triangular adjacency list. |
216 | |
217 // Array of adjacency-lists, indexed by live-range number | |
218 IndexSet *_adjs; | |
219 | |
220 // Assertion bit for proper use of Squaring | |
221 bool _is_square; | |
222 | |
223 // Live range structure goes here | |
224 LRG *_lrgs; // Array of LRG structures | |
225 | |
226 public: | |
227 // Largest live-range number | |
228 uint _maxlrg; | |
229 | |
230 Arena *_arena; | |
231 | |
232 // Keep track of inserted and deleted Nodes | |
233 VectorSet *_yanked; | |
234 | |
235 PhaseIFG( Arena *arena ); | |
236 void init( uint maxlrg ); | |
237 | |
238 // Add edge between a and b. Returns true if actually addded. | |
239 int add_edge( uint a, uint b ); | |
240 | |
241 // Add edge between a and everything in the vector | |
242 void add_vector( uint a, IndexSet *vec ); | |
243 | |
244 // Test for edge existance | |
245 int test_edge( uint a, uint b ) const; | |
246 | |
247 // Square-up matrix for faster Union | |
248 void SquareUp(); | |
249 | |
250 // Return number of LRG neighbors | |
251 uint neighbor_cnt( uint a ) const { return _adjs[a].count(); } | |
252 // Union edges of b into a on Squared-up matrix | |
253 void Union( uint a, uint b ); | |
254 // Test for edge in Squared-up matrix | |
255 int test_edge_sq( uint a, uint b ) const; | |
256 // Yank a Node and all connected edges from the IFG. Be prepared to | |
257 // re-insert the yanked Node in reverse order of yanking. Return a | |
258 // list of neighbors (edges) yanked. | |
259 IndexSet *remove_node( uint a ); | |
260 // Reinsert a yanked Node | |
261 void re_insert( uint a ); | |
262 // Return set of neighbors | |
263 IndexSet *neighbors( uint a ) const { return &_adjs[a]; } | |
264 | |
265 #ifndef PRODUCT | |
266 // Dump the IFG | |
267 void dump() const; | |
268 void stats() const; | |
269 void verify( const PhaseChaitin * ) const; | |
270 #endif | |
271 | |
272 //--------------- Live Range Accessors | |
273 LRG &lrgs(uint idx) const { assert(idx < _maxlrg, "oob"); return _lrgs[idx]; } | |
274 | |
275 // Compute and set effective degree. Might be folded into SquareUp(). | |
276 void Compute_Effective_Degree(); | |
277 | |
278 // Compute effective degree as the sum of neighbors' _sizes. | |
279 int effective_degree( uint lidx ) const; | |
280 }; | |
281 | |
10111 | 282 // The LiveRangeMap class is responsible for storing node to live range id mapping. |
283 // Each node is mapped to a live range id (a virtual register). Nodes that are | |
284 // not considered for register allocation are given live range id 0. | |
285 class LiveRangeMap VALUE_OBJ_CLASS_SPEC { | |
286 | |
287 private: | |
288 | |
289 uint _max_lrg_id; | |
290 | |
291 // Union-find map. Declared as a short for speed. | |
292 // Indexed by live-range number, it returns the compacted live-range number | |
293 LRG_List _uf_map; | |
294 | |
295 // Map from Nodes to live ranges | |
296 LRG_List _names; | |
297 | |
298 // Straight out of Tarjan's union-find algorithm | |
299 uint find_compress(const Node *node) { | |
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300 uint lrg_id = find_compress(_names.at(node->_idx)); |
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301 _names.at_put(node->_idx, lrg_id); |
10111 | 302 return lrg_id; |
303 } | |
304 | |
305 uint find_compress(uint lrg); | |
306 | |
307 public: | |
308 | |
309 const LRG_List& names() { | |
310 return _names; | |
311 } | |
312 | |
313 uint max_lrg_id() const { | |
314 return _max_lrg_id; | |
315 } | |
316 | |
317 void set_max_lrg_id(uint max_lrg_id) { | |
318 _max_lrg_id = max_lrg_id; | |
319 } | |
320 | |
321 uint size() const { | |
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322 return _names.length(); |
10111 | 323 } |
324 | |
325 uint live_range_id(uint idx) const { | |
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326 return _names.at(idx); |
10111 | 327 } |
328 | |
329 uint live_range_id(const Node *node) const { | |
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330 return _names.at(node->_idx); |
10111 | 331 } |
332 | |
333 uint uf_live_range_id(uint lrg_id) const { | |
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334 return _uf_map.at(lrg_id); |
10111 | 335 } |
0 | 336 |
10111 | 337 void map(uint idx, uint lrg_id) { |
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338 _names.at_put(idx, lrg_id); |
10111 | 339 } |
340 | |
341 void uf_map(uint dst_lrg_id, uint src_lrg_id) { | |
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342 _uf_map.at_put(dst_lrg_id, src_lrg_id); |
10111 | 343 } |
344 | |
345 void extend(uint idx, uint lrg_id) { | |
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346 _names.at_put_grow(idx, lrg_id); |
10111 | 347 } |
348 | |
349 void uf_extend(uint dst_lrg_id, uint src_lrg_id) { | |
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350 _uf_map.at_put_grow(dst_lrg_id, src_lrg_id); |
10111 | 351 } |
352 | |
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353 LiveRangeMap(Arena* arena, uint unique) |
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354 : _names(arena, unique, unique, 0) |
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355 , _uf_map(arena, unique, unique, 0) |
10111 | 356 , _max_lrg_id(0) {} |
357 | |
358 uint find_id( const Node *n ) { | |
359 uint retval = live_range_id(n); | |
360 assert(retval == find(n),"Invalid node to lidx mapping"); | |
361 return retval; | |
362 } | |
363 | |
364 // Reset the Union-Find map to identity | |
365 void reset_uf_map(uint max_lrg_id); | |
366 | |
367 // Make all Nodes map directly to their final live range; no need for | |
368 // the Union-Find mapping after this call. | |
369 void compress_uf_map_for_nodes(); | |
370 | |
371 uint find(uint lidx) { | |
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372 uint uf_lidx = _uf_map.at(lidx); |
10111 | 373 return (uf_lidx == lidx) ? uf_lidx : find_compress(lidx); |
374 } | |
375 | |
376 // Convert a Node into a Live Range Index - a lidx | |
377 uint find(const Node *node) { | |
378 uint lidx = live_range_id(node); | |
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379 uint uf_lidx = _uf_map.at(lidx); |
10111 | 380 return (uf_lidx == lidx) ? uf_lidx : find_compress(node); |
381 } | |
382 | |
383 // Like Find above, but no path compress, so bad asymptotic behavior | |
384 uint find_const(uint lrg) const; | |
385 | |
386 // Like Find above, but no path compress, so bad asymptotic behavior | |
387 uint find_const(const Node *node) const { | |
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388 if(node->_idx >= (uint)_names.length()) { |
10111 | 389 return 0; // not mapped, usual for debug dump |
390 } | |
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391 return find_const(_names.at(node->_idx)); |
10111 | 392 } |
393 }; | |
0 | 394 |
395 //------------------------------Chaitin---------------------------------------- | |
396 // Briggs-Chaitin style allocation, mostly. | |
397 class PhaseChaitin : public PhaseRegAlloc { | |
3939 | 398 friend class VMStructs; |
0 | 399 |
400 int _trip_cnt; | |
401 int _alternate; | |
402 | |
403 LRG &lrgs(uint idx) const { return _ifg->lrgs(idx); } | |
404 PhaseLive *_live; // Liveness, used in the interference graph | |
405 PhaseIFG *_ifg; // Interference graph (for original chunk) | |
406 Node_List **_lrg_nodes; // Array of node; lists for lrgs which spill | |
407 VectorSet _spilled_once; // Nodes that have been spilled | |
408 VectorSet _spilled_twice; // Nodes that have been spilled twice | |
409 | |
410 // Combine the Live Range Indices for these 2 Nodes into a single live | |
411 // range. Future requests for any Node in either live range will | |
412 // return the live range index for the combined live range. | |
413 void Union( const Node *src, const Node *dst ); | |
414 | |
415 void new_lrg( const Node *x, uint lrg ); | |
416 | |
417 // Compact live ranges, removing unused ones. Return new maxlrg. | |
418 void compact(); | |
419 | |
420 uint _lo_degree; // Head of lo-degree LRGs list | |
421 uint _lo_stk_degree; // Head of lo-stk-degree LRGs list | |
422 uint _hi_degree; // Head of hi-degree LRGs list | |
423 uint _simplified; // Linked list head of simplified LRGs | |
424 | |
425 // Helper functions for Split() | |
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426 uint split_DEF(Node *def, Block *b, int loc, uint max, Node **Reachblock, Node **debug_defs, GrowableArray<uint> splits, int slidx ); |
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427 uint split_USE(MachSpillCopyNode::SpillType spill_type, Node *def, Block *b, Node *use, uint useidx, uint max, bool def_down, bool cisc_sp, GrowableArray<uint> splits, int slidx ); |
10111 | 428 |
429 //------------------------------clone_projs------------------------------------ | |
430 // After cloning some rematerialized instruction, clone any MachProj's that | |
431 // follow it. Example: Intel zero is XOR, kills flags. Sparc FP constants | |
432 // use G3 as an address temp. | |
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433 int clone_projs(Block* b, uint idx, Node* orig, Node* copy, uint& max_lrg_id); |
10111 | 434 |
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435 int clone_projs(Block* b, uint idx, Node* orig, Node* copy, LiveRangeMap& lrg_map) { |
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436 uint max_lrg_id = lrg_map.max_lrg_id(); |
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437 int found_projs = clone_projs(b, idx, orig, copy, max_lrg_id); |
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438 if (found_projs > 0) { |
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439 // max_lrg_id is updated during call above |
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440 lrg_map.set_max_lrg_id(max_lrg_id); |
10111 | 441 } |
442 return found_projs; | |
443 } | |
444 | |
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445 Node *split_Rematerialize(Node *def, Block *b, uint insidx, uint &maxlrg, GrowableArray<uint> splits, |
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446 int slidx, uint *lrg2reach, Node **Reachblock, bool walkThru); |
0 | 447 // True if lidx is used before any real register is def'd in the block |
448 bool prompt_use( Block *b, uint lidx ); | |
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449 Node *get_spillcopy_wide(MachSpillCopyNode::SpillType spill_type, Node *def, Node *use, uint uidx ); |
605 | 450 // Insert the spill at chosen location. Skip over any intervening Proj's or |
0 | 451 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block |
452 // instead. Update high-pressure indices. Create a new live range. | |
453 void insert_proj( Block *b, uint i, Node *spill, uint maxlrg ); | |
454 | |
455 bool is_high_pressure( Block *b, LRG *lrg, uint insidx ); | |
456 | |
457 uint _oldphi; // Node index which separates pre-allocation nodes | |
458 | |
459 Block **_blks; // Array of blocks sorted by frequency for coalescing | |
460 | |
673 | 461 float _high_frequency_lrg; // Frequency at which LRG will be spilled for debug info |
462 | |
0 | 463 #ifndef PRODUCT |
464 bool _trace_spilling; | |
465 #endif | |
466 | |
467 public: | |
468 PhaseChaitin( uint unique, PhaseCFG &cfg, Matcher &matcher ); | |
469 ~PhaseChaitin() {} | |
470 | |
10111 | 471 LiveRangeMap _lrg_map; |
0 | 472 |
473 // Do all the real work of allocate | |
474 void Register_Allocate(); | |
475 | |
673 | 476 float high_frequency_lrg() const { return _high_frequency_lrg; } |
477 | |
0 | 478 #ifndef PRODUCT |
479 bool trace_spilling() const { return _trace_spilling; } | |
480 #endif | |
481 | |
482 private: | |
483 // De-SSA the world. Assign registers to Nodes. Use the same register for | |
484 // all inputs to a PhiNode, effectively coalescing live ranges. Insert | |
485 // copies as needed. | |
486 void de_ssa(); | |
487 | |
488 // Add edge between reg and everything in the vector. | |
489 // Same as _ifg->add_vector(reg,live) EXCEPT use the RegMask | |
490 // information to trim the set of interferences. Return the | |
491 // count of edges added. | |
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492 void interfere_with_live(uint lid, IndexSet* liveout); |
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493 #ifdef ASSERT |
0 | 494 // Count register pressure for asserts |
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495 uint count_int_pressure(IndexSet* liveout); |
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496 uint count_float_pressure(IndexSet* liveout); |
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497 #endif |
0 | 498 |
499 // Build the interference graph using virtual registers only. | |
500 // Used for aggressive coalescing. | |
501 void build_ifg_virtual( ); | |
502 | |
14496 | 503 // used when computing the register pressure for each block in the CFG. This |
504 // is done during IFG creation. | |
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505 class Pressure { |
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506 // keeps track of the register pressure at the current |
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507 // instruction (used when stepping backwards in the block) |
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508 uint _current_pressure; |
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509 |
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510 // keeps track of the instruction index of the first low to high register pressure |
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511 // transition (starting from the top) in the block |
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512 // if high_pressure_index == 0 then the whole block is high pressure |
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513 // if high_pressure_index = b.end_idx() + 1 then the whole block is low pressure |
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514 uint _high_pressure_index; |
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515 |
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516 // stores the highest pressure we find |
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517 uint _final_pressure; |
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518 |
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519 // number of live ranges that constitute high register pressure |
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520 const uint _high_pressure_limit; |
14496 | 521 public: |
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522 |
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523 // lower the register pressure and look for a low to high pressure |
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524 // transition |
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525 void lower(LRG& lrg, uint& location) { |
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526 _current_pressure -= lrg.reg_pressure(); |
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527 if (_current_pressure == _high_pressure_limit) { |
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528 _high_pressure_index = location; |
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529 } |
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530 } |
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531 |
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532 // raise the pressure and store the pressure if it's the biggest |
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533 // pressure so far |
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534 void raise(LRG &lrg) { |
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535 _current_pressure += lrg.reg_pressure(); |
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536 if (_current_pressure > _final_pressure) { |
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537 _final_pressure = _current_pressure; |
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538 } |
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539 } |
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540 |
14496 | 541 uint high_pressure_index() const { |
542 return _high_pressure_index; | |
543 } | |
544 | |
545 uint final_pressure() const { | |
546 return _final_pressure; | |
547 } | |
548 | |
549 uint current_pressure() const { | |
550 return _current_pressure; | |
551 } | |
552 | |
553 uint high_pressure_limit() const { | |
554 return _high_pressure_limit; | |
555 } | |
556 | |
557 void lower_high_pressure_index() { | |
558 _high_pressure_index--; | |
559 } | |
560 | |
561 void set_high_pressure_index_to_block_start() { | |
562 _high_pressure_index = 0; | |
563 } | |
564 | |
565 void check_pressure_at_fatproj(uint fatproj_location, RegMask& fatproj_mask) { | |
566 // this pressure is only valid at this instruction, i.e. we don't need to lower | |
567 // the register pressure since the fat proj was never live before (going backwards) | |
568 uint new_pressure = current_pressure() + fatproj_mask.Size(); | |
569 if (new_pressure > final_pressure()) { | |
570 _final_pressure = new_pressure; | |
571 } | |
572 | |
573 // if we were at a low pressure and now and the fat proj is at high pressure, record the fat proj location | |
574 // as coming from a low to high (to low again) | |
575 if (current_pressure() <= high_pressure_limit() && new_pressure > high_pressure_limit()) { | |
576 _high_pressure_index = fatproj_location; | |
577 } | |
578 } | |
579 | |
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580 Pressure(uint high_pressure_index, uint high_pressure_limit) |
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581 : _current_pressure(0) |
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582 , _high_pressure_index(high_pressure_index) |
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583 , _high_pressure_limit(high_pressure_limit) |
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584 , _final_pressure(0) {} |
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585 }; |
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586 |
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587 void lower_pressure(Block* b, uint location, LRG& lrg, IndexSet* liveout, Pressure& int_pressure, Pressure& float_pressure); |
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588 void raise_pressure(Block* b, LRG& lrg, Pressure& int_pressure, Pressure& float_pressure); |
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589 void check_for_high_pressure_transition_at_fatproj(uint& block_reg_pressure, uint location, LRG& lrg, Pressure& pressure, const int op_regtype); |
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590 void add_input_to_liveout(Block* b, Node* n, IndexSet* liveout, double cost, Pressure& int_pressure, Pressure& float_pressure); |
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591 void compute_initial_block_pressure(Block* b, IndexSet* liveout, Pressure& int_pressure, Pressure& float_pressure, double cost); |
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592 bool remove_node_if_not_used(Block* b, uint location, Node* n, uint lid, IndexSet* liveout); |
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593 void assign_high_score_to_immediate_copies(Block* b, Node* n, LRG& lrg, uint next_inst, uint last_inst); |
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594 void remove_interference_from_copy(Block* b, uint location, uint lid_copy, IndexSet* liveout, double cost, Pressure& int_pressure, Pressure& float_pressure); |
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595 void remove_bound_register_from_interfering_live_ranges(LRG& lrg, IndexSet* liveout, uint& must_spill); |
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596 void check_for_high_pressure_block(Pressure& pressure); |
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597 void adjust_high_pressure_index(Block* b, uint& hrp_index, Pressure& pressure); |
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598 |
0 | 599 // Build the interference graph using physical registers when available. |
600 // That is, if 2 live ranges are simultaneously alive but in their | |
601 // acceptable register sets do not overlap, then they do not interfere. | |
602 uint build_ifg_physical( ResourceArea *a ); | |
603 | |
604 // Gather LiveRanGe information, including register masks and base pointer/ | |
605 // derived pointer relationships. | |
606 void gather_lrg_masks( bool mod_cisc_masks ); | |
607 | |
608 // Force the bases of derived pointers to be alive at GC points. | |
609 bool stretch_base_pointer_live_ranges( ResourceArea *a ); | |
610 // Helper to stretch above; recursively discover the base Node for | |
611 // a given derived Node. Easy for AddP-related machine nodes, but | |
612 // needs to be recursive for derived Phis. | |
613 Node *find_base_for_derived( Node **derived_base_map, Node *derived, uint &maxlrg ); | |
614 | |
615 // Set the was-lo-degree bit. Conservative coalescing should not change the | |
616 // colorability of the graph. If any live range was of low-degree before | |
617 // coalescing, it should Simplify. This call sets the was-lo-degree bit. | |
618 void set_was_low(); | |
619 | |
620 // Split live-ranges that must spill due to register conflicts (as opposed | |
621 // to capacity spills). Typically these are things def'd in a register | |
622 // and used on the stack or vice-versa. | |
623 void pre_spill(); | |
624 | |
625 // Init LRG caching of degree, numregs. Init lo_degree list. | |
626 void cache_lrg_info( ); | |
627 | |
628 // Simplify the IFG by removing LRGs of low degree with no copies | |
629 void Pre_Simplify(); | |
630 | |
631 // Simplify the IFG by removing LRGs of low degree | |
632 void Simplify(); | |
633 | |
634 // Select colors by re-inserting edges into the IFG. | |
605 | 635 // Return TRUE if any spills occurred. |
0 | 636 uint Select( ); |
637 // Helper function for select which allows biased coloring | |
638 OptoReg::Name choose_color( LRG &lrg, int chunk ); | |
639 // Helper function which implements biasing heuristic | |
640 OptoReg::Name bias_color( LRG &lrg, int chunk ); | |
641 | |
642 // Split uncolorable live ranges | |
643 // Return new number of live ranges | |
6632 | 644 uint Split(uint maxlrg, ResourceArea* split_arena); |
0 | 645 |
646 // Copy 'was_spilled'-edness from one Node to another. | |
647 void copy_was_spilled( Node *src, Node *dst ); | |
648 // Set the 'spilled_once' or 'spilled_twice' flag on a node. | |
649 void set_was_spilled( Node *n ); | |
650 | |
651 // Convert ideal spill-nodes into machine loads & stores | |
652 // Set C->failing when fixup spills could not complete, node limit exceeded. | |
653 void fixup_spills(); | |
654 | |
655 // Post-Allocation peephole copy removal | |
656 void post_allocate_copy_removal(); | |
657 Node *skip_copies( Node *c ); | |
923 | 658 // Replace the old node with the current live version of that value |
659 // and yank the old value if it's dead. | |
660 int replace_and_yank_if_dead( Node *old, OptoReg::Name nreg, | |
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661 Block *current_block, Node_List& value, Node_List& regnd ) { |
923 | 662 Node* v = regnd[nreg]; |
663 assert(v->outcnt() != 0, "no dead values"); | |
664 old->replace_by(v); | |
665 return yank_if_dead(old, current_block, &value, ®nd); | |
666 } | |
667 | |
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668 int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd ) { |
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669 return yank_if_dead_recurse(old, old, current_block, value, regnd); |
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670 } |
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671 int yank_if_dead_recurse(Node *old, Node *orig_old, Block *current_block, |
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672 Node_List *value, Node_List *regnd); |
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673 int yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); |
0 | 674 int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List ®nd, bool can_change_regs ); |
675 int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List ®nd ); | |
676 bool may_be_copy_of_callee( Node *def ) const; | |
677 | |
678 // If nreg already contains the same constant as val then eliminate it | |
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679 bool eliminate_copy_of_constant(Node* val, Node* n, |
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680 Block *current_block, Node_List& value, Node_List ®nd, |
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681 OptoReg::Name nreg, OptoReg::Name nreg2); |
0 | 682 // Extend the node to LRG mapping |
683 void add_reference( const Node *node, const Node *old_node); | |
684 | |
685 private: | |
686 | |
687 static int _final_loads, _final_stores, _final_copies, _final_memoves; | |
688 static double _final_load_cost, _final_store_cost, _final_copy_cost, _final_memove_cost; | |
689 static int _conserv_coalesce, _conserv_coalesce_pair; | |
690 static int _conserv_coalesce_trie, _conserv_coalesce_quad; | |
691 static int _post_alloc; | |
692 static int _lost_opp_pp_coalesce, _lost_opp_cflow_coalesce; | |
693 static int _used_cisc_instructions, _unused_cisc_instructions; | |
694 static int _allocator_attempts, _allocator_successes; | |
695 | |
696 #ifndef PRODUCT | |
697 static uint _high_pressure, _low_pressure; | |
698 | |
699 void dump() const; | |
700 void dump( const Node *n ) const; | |
701 void dump( const Block * b ) const; | |
702 void dump_degree_lists() const; | |
703 void dump_simplified() const; | |
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704 void dump_lrg( uint lidx, bool defs_only) const; |
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705 void dump_lrg( uint lidx) const { |
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706 // dump defs and uses by default |
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707 dump_lrg(lidx, false); |
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708 } |
0 | 709 void dump_bb( uint pre_order ) const; |
710 | |
711 // Verify that base pointers and derived pointers are still sane | |
712 void verify_base_ptrs( ResourceArea *a ) const; | |
713 | |
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714 void verify( ResourceArea *a, bool verify_ifg = false ) const; |
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715 |
0 | 716 void dump_for_spill_split_recycle() const; |
717 | |
718 public: | |
719 void dump_frame() const; | |
720 char *dump_register( const Node *n, char *buf ) const; | |
721 private: | |
722 static void print_chaitin_statistics(); | |
723 #endif | |
724 friend class PhaseCoalesce; | |
725 friend class PhaseAggressiveCoalesce; | |
726 friend class PhaseConservativeCoalesce; | |
727 }; | |
1972 | 728 |
729 #endif // SHARE_VM_OPTO_CHAITIN_HPP |