Mercurial > hg > truffle
annotate src/share/vm/opto/chaitin.hpp @ 4128:f1391adc6681
7112034: Parallel CMS fails to properly mark reference objects
Summary: Enabled reference processing when work stealing during concurrent marking
Reviewed-by: jmasa, brutisso
author | stefank |
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date | Mon, 28 Nov 2011 10:19:26 +0100 |
parents | f6f3bb0ee072 |
children | 5da7201222d5 |
rev | line source |
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0 | 1 /* |
3939 | 2 * Copyright (c) 1997, 2011, 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 * | |
1552
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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: |
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: | |
83 int degree() const { assert( _degree_valid, "" ); return _eff_degree; } | |
84 // Degree starts not valid and any change to the IFG neighbor | |
85 // set makes it not valid. | |
86 void set_degree( uint degree ) { _eff_degree = degree; debug_only(_degree_valid = 1;) } | |
87 // Made a change that hammered degree | |
88 void invalid_degree() { debug_only(_degree_valid=0;) } | |
89 // Incrementally modify degree. If it was correct, it should remain correct | |
90 void inc_degree( uint mod ) { _eff_degree += mod; } | |
91 // Compute the degree between 2 live ranges | |
92 int compute_degree( LRG &l ) const; | |
93 | |
94 private: | |
95 RegMask _mask; // Allowed registers for this LRG | |
96 uint _mask_size; // cache of _mask.Size(); | |
97 public: | |
98 int compute_mask_size() const { return _mask.is_AllStack() ? 65535 : _mask.Size(); } | |
99 void set_mask_size( int size ) { | |
100 assert((size == 65535) || (size == (int)_mask.Size()), ""); | |
101 _mask_size = size; | |
102 debug_only(_msize_valid=1;) | |
103 debug_only( if( _num_regs == 2 && !_fat_proj ) _mask.VerifyPairs(); ) | |
104 } | |
105 void compute_set_mask_size() { set_mask_size(compute_mask_size()); } | |
106 int mask_size() const { assert( _msize_valid, "mask size not valid" ); | |
107 return _mask_size; } | |
108 // Get the last mask size computed, even if it does not match the | |
109 // count of bits in the current mask. | |
110 int get_invalid_mask_size() const { return _mask_size; } | |
111 const RegMask &mask() const { return _mask; } | |
112 void set_mask( const RegMask &rm ) { _mask = rm; debug_only(_msize_valid=0;)} | |
113 void AND( const RegMask &rm ) { _mask.AND(rm); debug_only(_msize_valid=0;)} | |
114 void SUBTRACT( const RegMask &rm ) { _mask.SUBTRACT(rm); debug_only(_msize_valid=0;)} | |
115 void Clear() { _mask.Clear() ; debug_only(_msize_valid=1); _mask_size = 0; } | |
116 void Set_All() { _mask.Set_All(); debug_only(_msize_valid=1); _mask_size = RegMask::CHUNK_SIZE; } | |
117 void Insert( OptoReg::Name reg ) { _mask.Insert(reg); debug_only(_msize_valid=0;) } | |
118 void Remove( OptoReg::Name reg ) { _mask.Remove(reg); debug_only(_msize_valid=0;) } | |
119 void ClearToPairs() { _mask.ClearToPairs(); debug_only(_msize_valid=0;) } | |
120 | |
121 // Number of registers this live range uses when it colors | |
122 private: | |
123 uint8 _num_regs; // 2 for Longs and Doubles, 1 for all else | |
124 // except _num_regs is kill count for fat_proj | |
125 public: | |
126 int num_regs() const { return _num_regs; } | |
127 void set_num_regs( int reg ) { assert( _num_regs == reg || !_num_regs, "" ); _num_regs = reg; } | |
128 | |
129 private: | |
130 // Number of physical registers this live range uses when it colors | |
131 // Architecture and register-set dependent | |
132 uint8 _reg_pressure; | |
133 public: | |
134 void set_reg_pressure(int i) { _reg_pressure = i; } | |
135 int reg_pressure() const { return _reg_pressure; } | |
136 | |
137 // How much 'wiggle room' does this live range have? | |
138 // How many color choices can it make (scaled by _num_regs)? | |
139 int degrees_of_freedom() const { return mask_size() - _num_regs; } | |
140 // Bound LRGs have ZERO degrees of freedom. We also count | |
141 // must_spill as bound. | |
142 bool is_bound () const { return _is_bound; } | |
143 // Negative degrees-of-freedom; even with no neighbors this | |
144 // live range must spill. | |
145 bool not_free() const { return degrees_of_freedom() < 0; } | |
146 // Is this live range of "low-degree"? Trivially colorable? | |
147 bool lo_degree () const { return degree() <= degrees_of_freedom(); } | |
148 // Is this live range just barely "low-degree"? Trivially colorable? | |
149 bool just_lo_degree () const { return degree() == degrees_of_freedom(); } | |
150 | |
151 uint _is_oop:1, // Live-range holds an oop | |
152 _is_float:1, // True if in float registers | |
153 _was_spilled1:1, // True if prior spilling on def | |
154 _was_spilled2:1, // True if twice prior spilling on def | |
155 _is_bound:1, // live range starts life with no | |
156 // degrees of freedom. | |
157 _direct_conflict:1, // True if def and use registers in conflict | |
158 _must_spill:1, // live range has lost all degrees of freedom | |
159 // If _fat_proj is set, live range does NOT require aligned, adjacent | |
160 // registers and has NO interferences. | |
161 // If _fat_proj is clear, live range requires num_regs() to be a power of | |
162 // 2, and it requires registers to form an aligned, adjacent set. | |
163 _fat_proj:1, // | |
164 _was_lo:1, // Was lo-degree prior to coalesce | |
165 _msize_valid:1, // _mask_size cache valid | |
166 _degree_valid:1, // _degree cache valid | |
167 _has_copy:1, // Adjacent to some copy instruction | |
168 _at_risk:1; // Simplify says this guy is at risk to spill | |
169 | |
170 | |
171 // Alive if non-zero, dead if zero | |
172 bool alive() const { return _def != NULL; } | |
295
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173 bool is_multidef() const { return _def == NodeSentinel; } |
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174 bool is_singledef() const { return _def != NodeSentinel; } |
0 | 175 |
176 #ifndef PRODUCT | |
177 void dump( ) const; | |
178 #endif | |
179 }; | |
180 | |
181 //------------------------------LRG_List--------------------------------------- | |
182 // Map Node indices to Live RanGe indices. | |
183 // Array lookup in the optimized case. | |
184 class LRG_List : public ResourceObj { | |
3939 | 185 friend class VMStructs; |
0 | 186 uint _cnt, _max; |
187 uint* _lidxs; | |
188 ReallocMark _nesting; // assertion check for reallocations | |
189 public: | |
190 LRG_List( uint max ); | |
191 | |
192 uint lookup( uint nidx ) const { | |
193 return _lidxs[nidx]; | |
194 } | |
195 uint operator[] (uint nidx) const { return lookup(nidx); } | |
196 | |
197 void map( uint nidx, uint lidx ) { | |
198 assert( nidx < _cnt, "oob" ); | |
199 _lidxs[nidx] = lidx; | |
200 } | |
201 void extend( uint nidx, uint lidx ); | |
202 | |
203 uint Size() const { return _cnt; } | |
204 }; | |
205 | |
206 //------------------------------IFG-------------------------------------------- | |
207 // InterFerence Graph | |
208 // An undirected graph implementation. Created with a fixed number of | |
209 // vertices. Edges can be added & tested. Vertices can be removed, then | |
210 // added back later with all edges intact. Can add edges between one vertex | |
211 // and a list of other vertices. Can union vertices (and their edges) | |
212 // together. The IFG needs to be really really fast, and also fairly | |
213 // abstract! It needs abstraction so I can fiddle with the implementation to | |
214 // get even more speed. | |
215 class PhaseIFG : public Phase { | |
3939 | 216 friend class VMStructs; |
0 | 217 // Current implementation: a triangular adjacency list. |
218 | |
219 // Array of adjacency-lists, indexed by live-range number | |
220 IndexSet *_adjs; | |
221 | |
222 // Assertion bit for proper use of Squaring | |
223 bool _is_square; | |
224 | |
225 // Live range structure goes here | |
226 LRG *_lrgs; // Array of LRG structures | |
227 | |
228 public: | |
229 // Largest live-range number | |
230 uint _maxlrg; | |
231 | |
232 Arena *_arena; | |
233 | |
234 // Keep track of inserted and deleted Nodes | |
235 VectorSet *_yanked; | |
236 | |
237 PhaseIFG( Arena *arena ); | |
238 void init( uint maxlrg ); | |
239 | |
240 // Add edge between a and b. Returns true if actually addded. | |
241 int add_edge( uint a, uint b ); | |
242 | |
243 // Add edge between a and everything in the vector | |
244 void add_vector( uint a, IndexSet *vec ); | |
245 | |
246 // Test for edge existance | |
247 int test_edge( uint a, uint b ) const; | |
248 | |
249 // Square-up matrix for faster Union | |
250 void SquareUp(); | |
251 | |
252 // Return number of LRG neighbors | |
253 uint neighbor_cnt( uint a ) const { return _adjs[a].count(); } | |
254 // Union edges of b into a on Squared-up matrix | |
255 void Union( uint a, uint b ); | |
256 // Test for edge in Squared-up matrix | |
257 int test_edge_sq( uint a, uint b ) const; | |
258 // Yank a Node and all connected edges from the IFG. Be prepared to | |
259 // re-insert the yanked Node in reverse order of yanking. Return a | |
260 // list of neighbors (edges) yanked. | |
261 IndexSet *remove_node( uint a ); | |
262 // Reinsert a yanked Node | |
263 void re_insert( uint a ); | |
264 // Return set of neighbors | |
265 IndexSet *neighbors( uint a ) const { return &_adjs[a]; } | |
266 | |
267 #ifndef PRODUCT | |
268 // Dump the IFG | |
269 void dump() const; | |
270 void stats() const; | |
271 void verify( const PhaseChaitin * ) const; | |
272 #endif | |
273 | |
274 //--------------- Live Range Accessors | |
275 LRG &lrgs(uint idx) const { assert(idx < _maxlrg, "oob"); return _lrgs[idx]; } | |
276 | |
277 // Compute and set effective degree. Might be folded into SquareUp(). | |
278 void Compute_Effective_Degree(); | |
279 | |
280 // Compute effective degree as the sum of neighbors' _sizes. | |
281 int effective_degree( uint lidx ) const; | |
282 }; | |
283 | |
284 // TEMPORARILY REPLACED WITH COMMAND LINE FLAG | |
285 | |
286 //// !!!!! Magic Constants need to move into ad file | |
287 #ifdef SPARC | |
288 //#define FLOAT_PRESSURE 30 /* SFLT_REG_mask.Size() - 1 */ | |
289 //#define INT_PRESSURE 23 /* NOTEMP_I_REG_mask.Size() - 1 */ | |
290 #define FLOAT_INCREMENT(regs) regs | |
291 #else | |
292 //#define FLOAT_PRESSURE 6 | |
293 //#define INT_PRESSURE 6 | |
294 #define FLOAT_INCREMENT(regs) 1 | |
295 #endif | |
296 | |
297 //------------------------------Chaitin---------------------------------------- | |
298 // Briggs-Chaitin style allocation, mostly. | |
299 class PhaseChaitin : public PhaseRegAlloc { | |
3939 | 300 friend class VMStructs; |
0 | 301 |
302 int _trip_cnt; | |
303 int _alternate; | |
304 | |
305 uint _maxlrg; // Max live range number | |
306 LRG &lrgs(uint idx) const { return _ifg->lrgs(idx); } | |
307 PhaseLive *_live; // Liveness, used in the interference graph | |
308 PhaseIFG *_ifg; // Interference graph (for original chunk) | |
309 Node_List **_lrg_nodes; // Array of node; lists for lrgs which spill | |
310 VectorSet _spilled_once; // Nodes that have been spilled | |
311 VectorSet _spilled_twice; // Nodes that have been spilled twice | |
312 | |
313 LRG_List _names; // Map from Nodes to Live RanGes | |
314 | |
315 // Union-find map. Declared as a short for speed. | |
316 // Indexed by live-range number, it returns the compacted live-range number | |
317 LRG_List _uf_map; | |
318 // Reset the Union-Find map to identity | |
319 void reset_uf_map( uint maxlrg ); | |
320 // Remove the need for the Union-Find mapping | |
321 void compress_uf_map_for_nodes( ); | |
322 | |
323 // Combine the Live Range Indices for these 2 Nodes into a single live | |
324 // range. Future requests for any Node in either live range will | |
325 // return the live range index for the combined live range. | |
326 void Union( const Node *src, const Node *dst ); | |
327 | |
328 void new_lrg( const Node *x, uint lrg ); | |
329 | |
330 // Compact live ranges, removing unused ones. Return new maxlrg. | |
331 void compact(); | |
332 | |
333 uint _lo_degree; // Head of lo-degree LRGs list | |
334 uint _lo_stk_degree; // Head of lo-stk-degree LRGs list | |
335 uint _hi_degree; // Head of hi-degree LRGs list | |
336 uint _simplified; // Linked list head of simplified LRGs | |
337 | |
338 // Helper functions for Split() | |
339 uint split_DEF( Node *def, Block *b, int loc, uint max, Node **Reachblock, Node **debug_defs, GrowableArray<uint> splits, int slidx ); | |
340 uint split_USE( Node *def, Block *b, Node *use, uint useidx, uint max, bool def_down, bool cisc_sp, GrowableArray<uint> splits, int slidx ); | |
341 int clone_projs( Block *b, uint idx, Node *con, Node *copy, uint &maxlrg ); | |
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342 Node *split_Rematerialize(Node *def, Block *b, uint insidx, uint &maxlrg, GrowableArray<uint> splits, |
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343 int slidx, uint *lrg2reach, Node **Reachblock, bool walkThru); |
0 | 344 // True if lidx is used before any real register is def'd in the block |
345 bool prompt_use( Block *b, uint lidx ); | |
346 Node *get_spillcopy_wide( Node *def, Node *use, uint uidx ); | |
605 | 347 // Insert the spill at chosen location. Skip over any intervening Proj's or |
0 | 348 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block |
349 // instead. Update high-pressure indices. Create a new live range. | |
350 void insert_proj( Block *b, uint i, Node *spill, uint maxlrg ); | |
351 | |
352 bool is_high_pressure( Block *b, LRG *lrg, uint insidx ); | |
353 | |
354 uint _oldphi; // Node index which separates pre-allocation nodes | |
355 | |
356 Block **_blks; // Array of blocks sorted by frequency for coalescing | |
357 | |
673 | 358 float _high_frequency_lrg; // Frequency at which LRG will be spilled for debug info |
359 | |
0 | 360 #ifndef PRODUCT |
361 bool _trace_spilling; | |
362 #endif | |
363 | |
364 public: | |
365 PhaseChaitin( uint unique, PhaseCFG &cfg, Matcher &matcher ); | |
366 ~PhaseChaitin() {} | |
367 | |
368 // Convert a Node into a Live Range Index - a lidx | |
369 uint Find( const Node *n ) { | |
370 uint lidx = n2lidx(n); | |
371 uint uf_lidx = _uf_map[lidx]; | |
372 return (uf_lidx == lidx) ? uf_lidx : Find_compress(n); | |
373 } | |
374 uint Find_const( uint lrg ) const; | |
375 uint Find_const( const Node *n ) const; | |
376 | |
377 // Do all the real work of allocate | |
378 void Register_Allocate(); | |
379 | |
380 uint n2lidx( const Node *n ) const { return _names[n->_idx]; } | |
381 | |
673 | 382 float high_frequency_lrg() const { return _high_frequency_lrg; } |
383 | |
0 | 384 #ifndef PRODUCT |
385 bool trace_spilling() const { return _trace_spilling; } | |
386 #endif | |
387 | |
388 private: | |
389 // De-SSA the world. Assign registers to Nodes. Use the same register for | |
390 // all inputs to a PhiNode, effectively coalescing live ranges. Insert | |
391 // copies as needed. | |
392 void de_ssa(); | |
393 uint Find_compress( const Node *n ); | |
394 uint Find( uint lidx ) { | |
395 uint uf_lidx = _uf_map[lidx]; | |
396 return (uf_lidx == lidx) ? uf_lidx : Find_compress(lidx); | |
397 } | |
398 uint Find_compress( uint lidx ); | |
399 | |
400 uint Find_id( const Node *n ) { | |
401 uint retval = n2lidx(n); | |
402 assert(retval == Find(n),"Invalid node to lidx mapping"); | |
403 return retval; | |
404 } | |
405 | |
406 // Add edge between reg and everything in the vector. | |
407 // Same as _ifg->add_vector(reg,live) EXCEPT use the RegMask | |
408 // information to trim the set of interferences. Return the | |
409 // count of edges added. | |
410 void interfere_with_live( uint reg, IndexSet *live ); | |
411 // Count register pressure for asserts | |
412 uint count_int_pressure( IndexSet *liveout ); | |
413 uint count_float_pressure( IndexSet *liveout ); | |
414 | |
415 // Build the interference graph using virtual registers only. | |
416 // Used for aggressive coalescing. | |
417 void build_ifg_virtual( ); | |
418 | |
419 // Build the interference graph using physical registers when available. | |
420 // That is, if 2 live ranges are simultaneously alive but in their | |
421 // acceptable register sets do not overlap, then they do not interfere. | |
422 uint build_ifg_physical( ResourceArea *a ); | |
423 | |
424 // Gather LiveRanGe information, including register masks and base pointer/ | |
425 // derived pointer relationships. | |
426 void gather_lrg_masks( bool mod_cisc_masks ); | |
427 | |
428 // Force the bases of derived pointers to be alive at GC points. | |
429 bool stretch_base_pointer_live_ranges( ResourceArea *a ); | |
430 // Helper to stretch above; recursively discover the base Node for | |
431 // a given derived Node. Easy for AddP-related machine nodes, but | |
432 // needs to be recursive for derived Phis. | |
433 Node *find_base_for_derived( Node **derived_base_map, Node *derived, uint &maxlrg ); | |
434 | |
435 // Set the was-lo-degree bit. Conservative coalescing should not change the | |
436 // colorability of the graph. If any live range was of low-degree before | |
437 // coalescing, it should Simplify. This call sets the was-lo-degree bit. | |
438 void set_was_low(); | |
439 | |
440 // Split live-ranges that must spill due to register conflicts (as opposed | |
441 // to capacity spills). Typically these are things def'd in a register | |
442 // and used on the stack or vice-versa. | |
443 void pre_spill(); | |
444 | |
445 // Init LRG caching of degree, numregs. Init lo_degree list. | |
446 void cache_lrg_info( ); | |
447 | |
448 // Simplify the IFG by removing LRGs of low degree with no copies | |
449 void Pre_Simplify(); | |
450 | |
451 // Simplify the IFG by removing LRGs of low degree | |
452 void Simplify(); | |
453 | |
454 // Select colors by re-inserting edges into the IFG. | |
605 | 455 // Return TRUE if any spills occurred. |
0 | 456 uint Select( ); |
457 // Helper function for select which allows biased coloring | |
458 OptoReg::Name choose_color( LRG &lrg, int chunk ); | |
459 // Helper function which implements biasing heuristic | |
460 OptoReg::Name bias_color( LRG &lrg, int chunk ); | |
461 | |
462 // Split uncolorable live ranges | |
463 // Return new number of live ranges | |
464 uint Split( uint maxlrg ); | |
465 | |
466 // Copy 'was_spilled'-edness from one Node to another. | |
467 void copy_was_spilled( Node *src, Node *dst ); | |
468 // Set the 'spilled_once' or 'spilled_twice' flag on a node. | |
469 void set_was_spilled( Node *n ); | |
470 | |
471 // Convert ideal spill-nodes into machine loads & stores | |
472 // Set C->failing when fixup spills could not complete, node limit exceeded. | |
473 void fixup_spills(); | |
474 | |
475 // Post-Allocation peephole copy removal | |
476 void post_allocate_copy_removal(); | |
477 Node *skip_copies( Node *c ); | |
923 | 478 // Replace the old node with the current live version of that value |
479 // and yank the old value if it's dead. | |
480 int replace_and_yank_if_dead( Node *old, OptoReg::Name nreg, | |
481 Block *current_block, Node_List& value, Node_List& regnd ) { | |
482 Node* v = regnd[nreg]; | |
483 assert(v->outcnt() != 0, "no dead values"); | |
484 old->replace_by(v); | |
485 return yank_if_dead(old, current_block, &value, ®nd); | |
486 } | |
487 | |
0 | 488 int yank_if_dead( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); |
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489 int yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ); |
0 | 490 int elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List ®nd, bool can_change_regs ); |
491 int use_prior_register( Node *copy, uint idx, Node *def, Block *current_block, Node_List &value, Node_List ®nd ); | |
492 bool may_be_copy_of_callee( Node *def ) const; | |
493 | |
494 // If nreg already contains the same constant as val then eliminate it | |
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495 bool eliminate_copy_of_constant(Node* val, Node* n, |
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496 Block *current_block, Node_List& value, Node_List ®nd, |
0 | 497 OptoReg::Name nreg, OptoReg::Name nreg2); |
498 // Extend the node to LRG mapping | |
499 void add_reference( const Node *node, const Node *old_node); | |
500 | |
501 private: | |
502 | |
503 static int _final_loads, _final_stores, _final_copies, _final_memoves; | |
504 static double _final_load_cost, _final_store_cost, _final_copy_cost, _final_memove_cost; | |
505 static int _conserv_coalesce, _conserv_coalesce_pair; | |
506 static int _conserv_coalesce_trie, _conserv_coalesce_quad; | |
507 static int _post_alloc; | |
508 static int _lost_opp_pp_coalesce, _lost_opp_cflow_coalesce; | |
509 static int _used_cisc_instructions, _unused_cisc_instructions; | |
510 static int _allocator_attempts, _allocator_successes; | |
511 | |
512 #ifndef PRODUCT | |
513 static uint _high_pressure, _low_pressure; | |
514 | |
515 void dump() const; | |
516 void dump( const Node *n ) const; | |
517 void dump( const Block * b ) const; | |
518 void dump_degree_lists() const; | |
519 void dump_simplified() const; | |
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520 void dump_lrg( uint lidx, bool defs_only) const; |
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521 void dump_lrg( uint lidx) const { |
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522 // dump defs and uses by default |
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523 dump_lrg(lidx, false); |
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524 } |
0 | 525 void dump_bb( uint pre_order ) const; |
526 | |
527 // Verify that base pointers and derived pointers are still sane | |
528 void verify_base_ptrs( ResourceArea *a ) const; | |
529 | |
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530 void verify( ResourceArea *a, bool verify_ifg = false ) const; |
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531 |
0 | 532 void dump_for_spill_split_recycle() const; |
533 | |
534 public: | |
535 void dump_frame() const; | |
536 char *dump_register( const Node *n, char *buf ) const; | |
537 private: | |
538 static void print_chaitin_statistics(); | |
539 #endif | |
540 friend class PhaseCoalesce; | |
541 friend class PhaseAggressiveCoalesce; | |
542 friend class PhaseConservativeCoalesce; | |
543 }; | |
1972 | 544 |
545 #endif // SHARE_VM_OPTO_CHAITIN_HPP |