Mercurial > hg > graal-compiler
annotate src/share/vm/opto/chaitin.hpp @ 14388:c84312468f5c
8031498: Cleanup and re-factorize PhaseChaitin::build_ifg_physical
Summary: Created sub-functions, added data structures, improved naming and removed unnecessary code
Reviewed-by: kvn, roland, rbackman
author | adlertz |
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date | Fri, 24 Jan 2014 13:06:52 +0100 |
parents | de6a9e811145 |
children | 99fc8c086679 |
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" | |
37 | |
0 | 38 class LoopTree; |
39 class MachCallNode; | |
40 class MachSafePointNode; | |
41 class Matcher; | |
42 class PhaseCFG; | |
43 class PhaseLive; | |
44 class PhaseRegAlloc; | |
45 class PhaseChaitin; | |
46 | |
47 #define OPTO_DEBUG_SPLIT_FREQ BLOCK_FREQUENCY(0.001) | |
48 #define OPTO_LRG_HIGH_FREQ BLOCK_FREQUENCY(0.25) | |
49 | |
50 //------------------------------LRG-------------------------------------------- | |
51 // Live-RanGe structure. | |
52 class LRG : public ResourceObj { | |
3939 | 53 friend class VMStructs; |
0 | 54 public: |
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55 static const uint AllStack_size = 0xFFFFF; // This mask size is used to tell that the mask of this LRG supports stack positions |
0 | 56 enum { SPILL_REG=29999 }; // Register number of a spilled LRG |
57 | |
58 double _cost; // 2 for loads/1 for stores times block freq | |
59 double _area; // Sum of all simultaneously live values | |
60 double score() const; // Compute score from cost and area | |
61 double _maxfreq; // Maximum frequency of any def or use | |
62 | |
63 Node *_def; // Check for multi-def live ranges | |
64 #ifndef PRODUCT | |
65 GrowableArray<Node*>* _defs; | |
66 #endif | |
67 | |
68 uint _risk_bias; // Index of LRG which we want to avoid color | |
69 uint _copy_bias; // Index of LRG which we want to share color | |
70 | |
71 uint _next; // Index of next LRG in linked list | |
72 uint _prev; // Index of prev LRG in linked list | |
73 private: | |
74 uint _reg; // Chosen register; undefined if mask is plural | |
75 public: | |
76 // Return chosen register for this LRG. Error if the LRG is not bound to | |
77 // a single register. | |
78 OptoReg::Name reg() const { return OptoReg::Name(_reg); } | |
79 void set_reg( OptoReg::Name r ) { _reg = r; } | |
80 | |
81 private: | |
82 uint _eff_degree; // Effective degree: Sum of neighbors _num_regs | |
83 public: | |
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84 int degree() const { assert( _degree_valid , "" ); return _eff_degree; } |
0 | 85 // Degree starts not valid and any change to the IFG neighbor |
86 // set makes it not valid. | |
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87 void set_degree( uint degree ) { |
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88 _eff_degree = degree; |
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89 debug_only(_degree_valid = 1;) |
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90 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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91 } |
0 | 92 // Made a change that hammered degree |
93 void invalid_degree() { debug_only(_degree_valid=0;) } | |
94 // Incrementally modify degree. If it was correct, it should remain correct | |
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95 void inc_degree( uint mod ) { |
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96 _eff_degree += mod; |
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97 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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98 } |
0 | 99 // Compute the degree between 2 live ranges |
100 int compute_degree( LRG &l ) const; | |
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101 bool mask_is_nonempty_and_up() const { |
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102 return mask().is_UP() && mask_size(); |
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103 } |
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104 bool is_float_or_vector() const { |
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105 return _is_float || _is_vector; |
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106 } |
0 | 107 |
108 private: | |
109 RegMask _mask; // Allowed registers for this LRG | |
110 uint _mask_size; // cache of _mask.Size(); | |
111 public: | |
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112 int compute_mask_size() const { return _mask.is_AllStack() ? AllStack_size : _mask.Size(); } |
0 | 113 void set_mask_size( int size ) { |
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114 assert((size == (int)AllStack_size) || (size == (int)_mask.Size()), ""); |
0 | 115 _mask_size = size; |
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116 #ifdef ASSERT |
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117 _msize_valid=1; |
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118 if (_is_vector) { |
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119 assert(!_fat_proj, "sanity"); |
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120 _mask.verify_sets(_num_regs); |
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121 } else if (_num_regs == 2 && !_fat_proj) { |
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122 _mask.verify_pairs(); |
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123 } |
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124 #endif |
0 | 125 } |
126 void compute_set_mask_size() { set_mask_size(compute_mask_size()); } | |
127 int mask_size() const { assert( _msize_valid, "mask size not valid" ); | |
128 return _mask_size; } | |
129 // Get the last mask size computed, even if it does not match the | |
130 // count of bits in the current mask. | |
131 int get_invalid_mask_size() const { return _mask_size; } | |
132 const RegMask &mask() const { return _mask; } | |
133 void set_mask( const RegMask &rm ) { _mask = rm; debug_only(_msize_valid=0;)} | |
134 void AND( const RegMask &rm ) { _mask.AND(rm); debug_only(_msize_valid=0;)} | |
135 void SUBTRACT( const RegMask &rm ) { _mask.SUBTRACT(rm); debug_only(_msize_valid=0;)} | |
136 void Clear() { _mask.Clear() ; debug_only(_msize_valid=1); _mask_size = 0; } | |
137 void Set_All() { _mask.Set_All(); debug_only(_msize_valid=1); _mask_size = RegMask::CHUNK_SIZE; } | |
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138 |
0 | 139 void Insert( OptoReg::Name reg ) { _mask.Insert(reg); debug_only(_msize_valid=0;) } |
140 void Remove( OptoReg::Name reg ) { _mask.Remove(reg); debug_only(_msize_valid=0;) } | |
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141 void clear_to_pairs() { _mask.clear_to_pairs(); debug_only(_msize_valid=0;) } |
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142 void clear_to_sets() { _mask.clear_to_sets(_num_regs); debug_only(_msize_valid=0;) } |
0 | 143 |
144 // Number of registers this live range uses when it colors | |
145 private: | |
146 uint8 _num_regs; // 2 for Longs and Doubles, 1 for all else | |
147 // except _num_regs is kill count for fat_proj | |
148 public: | |
149 int num_regs() const { return _num_regs; } | |
150 void set_num_regs( int reg ) { assert( _num_regs == reg || !_num_regs, "" ); _num_regs = reg; } | |
151 | |
152 private: | |
153 // Number of physical registers this live range uses when it colors | |
154 // Architecture and register-set dependent | |
155 uint8 _reg_pressure; | |
156 public: | |
157 void set_reg_pressure(int i) { _reg_pressure = i; } | |
158 int reg_pressure() const { return _reg_pressure; } | |
159 | |
160 // How much 'wiggle room' does this live range have? | |
161 // How many color choices can it make (scaled by _num_regs)? | |
162 int degrees_of_freedom() const { return mask_size() - _num_regs; } | |
163 // Bound LRGs have ZERO degrees of freedom. We also count | |
164 // must_spill as bound. | |
165 bool is_bound () const { return _is_bound; } | |
166 // Negative degrees-of-freedom; even with no neighbors this | |
167 // live range must spill. | |
168 bool not_free() const { return degrees_of_freedom() < 0; } | |
169 // Is this live range of "low-degree"? Trivially colorable? | |
170 bool lo_degree () const { return degree() <= degrees_of_freedom(); } | |
171 // Is this live range just barely "low-degree"? Trivially colorable? | |
172 bool just_lo_degree () const { return degree() == degrees_of_freedom(); } | |
173 | |
174 uint _is_oop:1, // Live-range holds an oop | |
175 _is_float:1, // True if in float registers | |
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176 _is_vector:1, // True if in vector registers |
0 | 177 _was_spilled1:1, // True if prior spilling on def |
178 _was_spilled2:1, // True if twice prior spilling on def | |
179 _is_bound:1, // live range starts life with no | |
180 // degrees of freedom. | |
181 _direct_conflict:1, // True if def and use registers in conflict | |
182 _must_spill:1, // live range has lost all degrees of freedom | |
183 // If _fat_proj is set, live range does NOT require aligned, adjacent | |
184 // registers and has NO interferences. | |
185 // If _fat_proj is clear, live range requires num_regs() to be a power of | |
186 // 2, and it requires registers to form an aligned, adjacent set. | |
187 _fat_proj:1, // | |
188 _was_lo:1, // Was lo-degree prior to coalesce | |
189 _msize_valid:1, // _mask_size cache valid | |
190 _degree_valid:1, // _degree cache valid | |
191 _has_copy:1, // Adjacent to some copy instruction | |
192 _at_risk:1; // Simplify says this guy is at risk to spill | |
193 | |
194 | |
195 // Alive if non-zero, dead if zero | |
196 bool alive() const { return _def != NULL; } | |
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197 bool is_multidef() const { return _def == NodeSentinel; } |
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198 bool is_singledef() const { return _def != NodeSentinel; } |
0 | 199 |
200 #ifndef PRODUCT | |
201 void dump( ) const; | |
202 #endif | |
203 }; | |
204 | |
205 //------------------------------IFG-------------------------------------------- | |
206 // InterFerence Graph | |
207 // An undirected graph implementation. Created with a fixed number of | |
208 // vertices. Edges can be added & tested. Vertices can be removed, then | |
209 // added back later with all edges intact. Can add edges between one vertex | |
210 // and a list of other vertices. Can union vertices (and their edges) | |
211 // together. The IFG needs to be really really fast, and also fairly | |
212 // abstract! It needs abstraction so I can fiddle with the implementation to | |
213 // get even more speed. | |
214 class PhaseIFG : public Phase { | |
3939 | 215 friend class VMStructs; |
0 | 216 // Current implementation: a triangular adjacency list. |
217 | |
218 // Array of adjacency-lists, indexed by live-range number | |
219 IndexSet *_adjs; | |
220 | |
221 // Assertion bit for proper use of Squaring | |
222 bool _is_square; | |
223 | |
224 // Live range structure goes here | |
225 LRG *_lrgs; // Array of LRG structures | |
226 | |
227 public: | |
228 // Largest live-range number | |
229 uint _maxlrg; | |
230 | |
231 Arena *_arena; | |
232 | |
233 // Keep track of inserted and deleted Nodes | |
234 VectorSet *_yanked; | |
235 | |
236 PhaseIFG( Arena *arena ); | |
237 void init( uint maxlrg ); | |
238 | |
239 // Add edge between a and b. Returns true if actually addded. | |
240 int add_edge( uint a, uint b ); | |
241 | |
242 // Add edge between a and everything in the vector | |
243 void add_vector( uint a, IndexSet *vec ); | |
244 | |
245 // Test for edge existance | |
246 int test_edge( uint a, uint b ) const; | |
247 | |
248 // Square-up matrix for faster Union | |
249 void SquareUp(); | |
250 | |
251 // Return number of LRG neighbors | |
252 uint neighbor_cnt( uint a ) const { return _adjs[a].count(); } | |
253 // Union edges of b into a on Squared-up matrix | |
254 void Union( uint a, uint b ); | |
255 // Test for edge in Squared-up matrix | |
256 int test_edge_sq( uint a, uint b ) const; | |
257 // Yank a Node and all connected edges from the IFG. Be prepared to | |
258 // re-insert the yanked Node in reverse order of yanking. Return a | |
259 // list of neighbors (edges) yanked. | |
260 IndexSet *remove_node( uint a ); | |
261 // Reinsert a yanked Node | |
262 void re_insert( uint a ); | |
263 // Return set of neighbors | |
264 IndexSet *neighbors( uint a ) const { return &_adjs[a]; } | |
265 | |
266 #ifndef PRODUCT | |
267 // Dump the IFG | |
268 void dump() const; | |
269 void stats() const; | |
270 void verify( const PhaseChaitin * ) const; | |
271 #endif | |
272 | |
273 //--------------- Live Range Accessors | |
274 LRG &lrgs(uint idx) const { assert(idx < _maxlrg, "oob"); return _lrgs[idx]; } | |
275 | |
276 // Compute and set effective degree. Might be folded into SquareUp(). | |
277 void Compute_Effective_Degree(); | |
278 | |
279 // Compute effective degree as the sum of neighbors' _sizes. | |
280 int effective_degree( uint lidx ) const; | |
281 }; | |
282 | |
10111 | 283 // The LiveRangeMap class is responsible for storing node to live range id mapping. |
284 // Each node is mapped to a live range id (a virtual register). Nodes that are | |
285 // not considered for register allocation are given live range id 0. | |
286 class LiveRangeMap VALUE_OBJ_CLASS_SPEC { | |
287 | |
288 private: | |
289 | |
290 uint _max_lrg_id; | |
291 | |
292 // Union-find map. Declared as a short for speed. | |
293 // Indexed by live-range number, it returns the compacted live-range number | |
294 LRG_List _uf_map; | |
295 | |
296 // Map from Nodes to live ranges | |
297 LRG_List _names; | |
298 | |
299 // Straight out of Tarjan's union-find algorithm | |
300 uint find_compress(const Node *node) { | |
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301 uint lrg_id = find_compress(_names.at(node->_idx)); |
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302 _names.at_put(node->_idx, lrg_id); |
10111 | 303 return lrg_id; |
304 } | |
305 | |
306 uint find_compress(uint lrg); | |
307 | |
308 public: | |
309 | |
310 const LRG_List& names() { | |
311 return _names; | |
312 } | |
313 | |
314 uint max_lrg_id() const { | |
315 return _max_lrg_id; | |
316 } | |
317 | |
318 void set_max_lrg_id(uint max_lrg_id) { | |
319 _max_lrg_id = max_lrg_id; | |
320 } | |
321 | |
322 uint size() const { | |
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323 return _names.length(); |
10111 | 324 } |
325 | |
326 uint live_range_id(uint idx) const { | |
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327 return _names.at(idx); |
10111 | 328 } |
329 | |
330 uint live_range_id(const Node *node) const { | |
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331 return _names.at(node->_idx); |
10111 | 332 } |
333 | |
334 uint uf_live_range_id(uint lrg_id) const { | |
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335 return _uf_map.at(lrg_id); |
10111 | 336 } |
0 | 337 |
10111 | 338 void map(uint idx, uint lrg_id) { |
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339 _names.at_put(idx, lrg_id); |
10111 | 340 } |
341 | |
342 void uf_map(uint dst_lrg_id, uint src_lrg_id) { | |
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343 _uf_map.at_put(dst_lrg_id, src_lrg_id); |
10111 | 344 } |
345 | |
346 void extend(uint idx, uint lrg_id) { | |
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347 _names.at_put_grow(idx, lrg_id); |
10111 | 348 } |
349 | |
350 void uf_extend(uint dst_lrg_id, uint src_lrg_id) { | |
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351 _uf_map.at_put_grow(dst_lrg_id, src_lrg_id); |
10111 | 352 } |
353 | |
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354 LiveRangeMap(Arena* arena, uint unique) |
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355 : _names(arena, unique, unique, 0) |
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356 , _uf_map(arena, unique, unique, 0) |
10111 | 357 , _max_lrg_id(0) {} |
358 | |
359 uint find_id( const Node *n ) { | |
360 uint retval = live_range_id(n); | |
361 assert(retval == find(n),"Invalid node to lidx mapping"); | |
362 return retval; | |
363 } | |
364 | |
365 // Reset the Union-Find map to identity | |
366 void reset_uf_map(uint max_lrg_id); | |
367 | |
368 // Make all Nodes map directly to their final live range; no need for | |
369 // the Union-Find mapping after this call. | |
370 void compress_uf_map_for_nodes(); | |
371 | |
372 uint find(uint lidx) { | |
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373 uint uf_lidx = _uf_map.at(lidx); |
10111 | 374 return (uf_lidx == lidx) ? uf_lidx : find_compress(lidx); |
375 } | |
376 | |
377 // Convert a Node into a Live Range Index - a lidx | |
378 uint find(const Node *node) { | |
379 uint lidx = live_range_id(node); | |
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380 uint uf_lidx = _uf_map.at(lidx); |
10111 | 381 return (uf_lidx == lidx) ? uf_lidx : find_compress(node); |
382 } | |
383 | |
384 // Like Find above, but no path compress, so bad asymptotic behavior | |
385 uint find_const(uint lrg) const; | |
386 | |
387 // Like Find above, but no path compress, so bad asymptotic behavior | |
388 uint find_const(const Node *node) const { | |
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389 if(node->_idx >= (uint)_names.length()) { |
10111 | 390 return 0; // not mapped, usual for debug dump |
391 } | |
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392 return find_const(_names.at(node->_idx)); |
10111 | 393 } |
394 }; | |
0 | 395 |
396 //------------------------------Chaitin---------------------------------------- | |
397 // Briggs-Chaitin style allocation, mostly. | |
398 class PhaseChaitin : public PhaseRegAlloc { | |
3939 | 399 friend class VMStructs; |
0 | 400 |
401 int _trip_cnt; | |
402 int _alternate; | |
403 | |
404 LRG &lrgs(uint idx) const { return _ifg->lrgs(idx); } | |
405 PhaseLive *_live; // Liveness, used in the interference graph | |
406 PhaseIFG *_ifg; // Interference graph (for original chunk) | |
407 Node_List **_lrg_nodes; // Array of node; lists for lrgs which spill | |
408 VectorSet _spilled_once; // Nodes that have been spilled | |
409 VectorSet _spilled_twice; // Nodes that have been spilled twice | |
410 | |
411 // Combine the Live Range Indices for these 2 Nodes into a single live | |
412 // range. Future requests for any Node in either live range will | |
413 // return the live range index for the combined live range. | |
414 void Union( const Node *src, const Node *dst ); | |
415 | |
416 void new_lrg( const Node *x, uint lrg ); | |
417 | |
418 // Compact live ranges, removing unused ones. Return new maxlrg. | |
419 void compact(); | |
420 | |
421 uint _lo_degree; // Head of lo-degree LRGs list | |
422 uint _lo_stk_degree; // Head of lo-stk-degree LRGs list | |
423 uint _hi_degree; // Head of hi-degree LRGs list | |
424 uint _simplified; // Linked list head of simplified LRGs | |
425 | |
426 // Helper functions for Split() | |
427 uint split_DEF( Node *def, Block *b, int loc, uint max, Node **Reachblock, Node **debug_defs, GrowableArray<uint> splits, int slidx ); | |
428 uint split_USE( Node *def, Block *b, Node *use, uint useidx, uint max, bool def_down, bool cisc_sp, GrowableArray<uint> splits, int slidx ); | |
10111 | 429 |
430 //------------------------------clone_projs------------------------------------ | |
431 // After cloning some rematerialized instruction, clone any MachProj's that | |
432 // follow it. Example: Intel zero is XOR, kills flags. Sparc FP constants | |
433 // use G3 as an address temp. | |
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434 int clone_projs(Block* b, uint idx, Node* orig, Node* copy, uint& max_lrg_id); |
10111 | 435 |
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436 int clone_projs(Block* b, uint idx, Node* orig, Node* copy, LiveRangeMap& lrg_map) { |
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437 uint max_lrg_id = lrg_map.max_lrg_id(); |
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438 int found_projs = clone_projs(b, idx, orig, copy, max_lrg_id); |
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439 if (found_projs > 0) { |
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440 // max_lrg_id is updated during call above |
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441 lrg_map.set_max_lrg_id(max_lrg_id); |
10111 | 442 } |
443 return found_projs; | |
444 } | |
445 | |
295
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446 Node *split_Rematerialize(Node *def, Block *b, uint insidx, uint &maxlrg, GrowableArray<uint> splits, |
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447 int slidx, uint *lrg2reach, Node **Reachblock, bool walkThru); |
0 | 448 // True if lidx is used before any real register is def'd in the block |
449 bool prompt_use( Block *b, uint lidx ); | |
450 Node *get_spillcopy_wide( Node *def, Node *use, uint uidx ); | |
605 | 451 // Insert the spill at chosen location. Skip over any intervening Proj's or |
0 | 452 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block |
453 // instead. Update high-pressure indices. Create a new live range. | |
454 void insert_proj( Block *b, uint i, Node *spill, uint maxlrg ); | |
455 | |
456 bool is_high_pressure( Block *b, LRG *lrg, uint insidx ); | |
457 | |
458 uint _oldphi; // Node index which separates pre-allocation nodes | |
459 | |
460 Block **_blks; // Array of blocks sorted by frequency for coalescing | |
461 | |
673 | 462 float _high_frequency_lrg; // Frequency at which LRG will be spilled for debug info |
463 | |
0 | 464 #ifndef PRODUCT |
465 bool _trace_spilling; | |
466 #endif | |
467 | |
468 public: | |
469 PhaseChaitin( uint unique, PhaseCFG &cfg, Matcher &matcher ); | |
470 ~PhaseChaitin() {} | |
471 | |
10111 | 472 LiveRangeMap _lrg_map; |
0 | 473 |
474 // Do all the real work of allocate | |
475 void Register_Allocate(); | |
476 | |
673 | 477 float high_frequency_lrg() const { return _high_frequency_lrg; } |
478 | |
0 | 479 #ifndef PRODUCT |
480 bool trace_spilling() const { return _trace_spilling; } | |
481 #endif | |
482 | |
483 private: | |
484 // De-SSA the world. Assign registers to Nodes. Use the same register for | |
485 // all inputs to a PhiNode, effectively coalescing live ranges. Insert | |
486 // copies as needed. | |
487 void de_ssa(); | |
488 | |
489 // Add edge between reg and everything in the vector. | |
490 // Same as _ifg->add_vector(reg,live) EXCEPT use the RegMask | |
491 // information to trim the set of interferences. Return the | |
492 // count of edges added. | |
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493 void interfere_with_live(uint lid, IndexSet* liveout); |
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494 #ifdef ASSERT |
0 | 495 // Count register pressure for asserts |
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496 uint count_int_pressure(IndexSet* liveout); |
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497 uint count_float_pressure(IndexSet* liveout); |
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498 #endif |
0 | 499 |
500 // Build the interference graph using virtual registers only. | |
501 // Used for aggressive coalescing. | |
502 void build_ifg_virtual( ); | |
503 | |
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504 class Pressure { |
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505 public: |
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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; |
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521 |
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522 // lower the register pressure and look for a low to high pressure |
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523 // transition |
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524 void lower(LRG& lrg, uint& location) { |
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525 _current_pressure -= lrg.reg_pressure(); |
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526 if (_current_pressure == _high_pressure_limit) { |
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527 _high_pressure_index = location; |
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528 if (_current_pressure > _final_pressure) { |
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529 _final_pressure = _current_pressure + 1; |
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530 } |
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531 } |
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532 } |
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533 |
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534 // raise the pressure and store the pressure if it's the biggest |
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535 // pressure so far |
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536 void raise(LRG &lrg) { |
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537 _current_pressure += lrg.reg_pressure(); |
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538 if (_current_pressure > _final_pressure) { |
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539 _final_pressure = _current_pressure; |
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540 } |
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541 } |
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542 |
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543 Pressure(uint high_pressure_index, uint high_pressure_limit) |
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544 : _current_pressure(0) |
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545 , _high_pressure_index(high_pressure_index) |
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546 , _high_pressure_limit(high_pressure_limit) |
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547 , _final_pressure(0) {} |
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548 }; |
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549 |
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550 void lower_pressure(Block* b, uint location, LRG& lrg, IndexSet* liveout, Pressure& int_pressure, Pressure& float_pressure); |
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551 void raise_pressure(Block* b, LRG& lrg, Pressure& int_pressure, Pressure& float_pressure); |
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552 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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553 void add_input_to_liveout(Block* b, Node* n, IndexSet* liveout, double cost, Pressure& int_pressure, Pressure& float_pressure); |
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554 void compute_initial_block_pressure(Block* b, IndexSet* liveout, Pressure& int_pressure, Pressure& float_pressure, double cost); |
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555 bool remove_node_if_not_used(Block* b, uint location, Node* n, uint lid, IndexSet* liveout); |
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556 void assign_high_score_to_immediate_copies(Block* b, Node* n, LRG& lrg, uint next_inst, uint last_inst); |
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557 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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558 void remove_bound_register_from_interfering_live_ranges(LRG& lrg, IndexSet* liveout, uint& must_spill); |
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559 void check_for_high_pressure_block(Pressure& pressure); |
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560 void adjust_high_pressure_index(Block* b, uint& hrp_index, Pressure& pressure); |
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561 |
0 | 562 // Build the interference graph using physical registers when available. |
563 // That is, if 2 live ranges are simultaneously alive but in their | |
564 // acceptable register sets do not overlap, then they do not interfere. | |
565 uint build_ifg_physical( ResourceArea *a ); | |
566 | |
567 // Gather LiveRanGe information, including register masks and base pointer/ | |
568 // derived pointer relationships. | |
569 void gather_lrg_masks( bool mod_cisc_masks ); | |
570 | |
571 // Force the bases of derived pointers to be alive at GC points. | |
572 bool stretch_base_pointer_live_ranges( ResourceArea *a ); | |
573 // Helper to stretch above; recursively discover the base Node for | |
574 // a given derived Node. Easy for AddP-related machine nodes, but | |
575 // needs to be recursive for derived Phis. | |
576 Node *find_base_for_derived( Node **derived_base_map, Node *derived, uint &maxlrg ); | |
577 | |
578 // Set the was-lo-degree bit. Conservative coalescing should not change the | |
579 // colorability of the graph. If any live range was of low-degree before | |
580 // coalescing, it should Simplify. This call sets the was-lo-degree bit. | |
581 void set_was_low(); | |
582 | |
583 // Split live-ranges that must spill due to register conflicts (as opposed | |
584 // to capacity spills). Typically these are things def'd in a register | |
585 // and used on the stack or vice-versa. | |
586 void pre_spill(); | |
587 | |
588 // Init LRG caching of degree, numregs. Init lo_degree list. | |
589 void cache_lrg_info( ); | |
590 | |
591 // Simplify the IFG by removing LRGs of low degree with no copies | |
592 void Pre_Simplify(); | |
593 | |
594 // Simplify the IFG by removing LRGs of low degree | |
595 void Simplify(); | |
596 | |
597 // Select colors by re-inserting edges into the IFG. | |
605 | 598 // Return TRUE if any spills occurred. |
0 | 599 uint Select( ); |
600 // Helper function for select which allows biased coloring | |
601 OptoReg::Name choose_color( LRG &lrg, int chunk ); | |
602 // Helper function which implements biasing heuristic | |
603 OptoReg::Name bias_color( LRG &lrg, int chunk ); | |
604 | |
605 // Split uncolorable live ranges | |
606 // Return new number of live ranges | |
6632 | 607 uint Split(uint maxlrg, ResourceArea* split_arena); |
0 | 608 |
609 // Copy 'was_spilled'-edness from one Node to another. | |
610 void copy_was_spilled( Node *src, Node *dst ); | |
611 // Set the 'spilled_once' or 'spilled_twice' flag on a node. | |
612 void set_was_spilled( Node *n ); | |
613 | |
614 // Convert ideal spill-nodes into machine loads & stores | |
615 // Set C->failing when fixup spills could not complete, node limit exceeded. | |
616 void fixup_spills(); | |
617 | |
618 // Post-Allocation peephole copy removal | |
619 void post_allocate_copy_removal(); | |
620 Node *skip_copies( Node *c ); | |
923 | 621 // Replace the old node with the current live version of that value |
622 // and yank the old value if it's dead. | |
623 int replace_and_yank_if_dead( Node *old, OptoReg::Name nreg, | |
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624 Block *current_block, Node_List& value, Node_List& regnd ) { |
923 | 625 Node* v = regnd[nreg]; |
626 assert(v->outcnt() != 0, "no dead values"); | |
627 old->replace_by(v); | |
628 return yank_if_dead(old, current_block, &value, ®nd); | |
629 } | |
630 | |
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631 int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd ) { |
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632 return yank_if_dead_recurse(old, old, current_block, value, regnd); |
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633 } |
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634 int yank_if_dead_recurse(Node *old, Node *orig_old, Block *current_block, |
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635 Node_List *value, Node_List *regnd); |
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636 int yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); |
0 | 637 int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List ®nd, bool can_change_regs ); |
638 int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List ®nd ); | |
639 bool may_be_copy_of_callee( Node *def ) const; | |
640 | |
641 // If nreg already contains the same constant as val then eliminate it | |
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642 bool eliminate_copy_of_constant(Node* val, Node* n, |
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643 Block *current_block, Node_List& value, Node_List ®nd, |
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644 OptoReg::Name nreg, OptoReg::Name nreg2); |
0 | 645 // Extend the node to LRG mapping |
646 void add_reference( const Node *node, const Node *old_node); | |
647 | |
648 private: | |
649 | |
650 static int _final_loads, _final_stores, _final_copies, _final_memoves; | |
651 static double _final_load_cost, _final_store_cost, _final_copy_cost, _final_memove_cost; | |
652 static int _conserv_coalesce, _conserv_coalesce_pair; | |
653 static int _conserv_coalesce_trie, _conserv_coalesce_quad; | |
654 static int _post_alloc; | |
655 static int _lost_opp_pp_coalesce, _lost_opp_cflow_coalesce; | |
656 static int _used_cisc_instructions, _unused_cisc_instructions; | |
657 static int _allocator_attempts, _allocator_successes; | |
658 | |
659 #ifndef PRODUCT | |
660 static uint _high_pressure, _low_pressure; | |
661 | |
662 void dump() const; | |
663 void dump( const Node *n ) const; | |
664 void dump( const Block * b ) const; | |
665 void dump_degree_lists() const; | |
666 void dump_simplified() const; | |
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667 void dump_lrg( uint lidx, bool defs_only) const; |
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668 void dump_lrg( uint lidx) const { |
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669 // dump defs and uses by default |
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670 dump_lrg(lidx, false); |
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671 } |
0 | 672 void dump_bb( uint pre_order ) const; |
673 | |
674 // Verify that base pointers and derived pointers are still sane | |
675 void verify_base_ptrs( ResourceArea *a ) const; | |
676 | |
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677 void verify( ResourceArea *a, bool verify_ifg = false ) const; |
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678 |
0 | 679 void dump_for_spill_split_recycle() const; |
680 | |
681 public: | |
682 void dump_frame() const; | |
683 char *dump_register( const Node *n, char *buf ) const; | |
684 private: | |
685 static void print_chaitin_statistics(); | |
686 #endif | |
687 friend class PhaseCoalesce; | |
688 friend class PhaseAggressiveCoalesce; | |
689 friend class PhaseConservativeCoalesce; | |
690 }; | |
1972 | 691 |
692 #endif // SHARE_VM_OPTO_CHAITIN_HPP |