Mercurial > hg > truffle
annotate src/share/vm/opto/reg_split.cpp @ 4237:30b6720604d2
Undid expected failure for EscapeAnalysisTest.testMonitor2().
author | Doug Simon <doug.simon@oracle.com> |
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date | Fri, 06 Jan 2012 15:35:52 +0100 |
parents | c7b60b601eb4 |
children | 8c92982cbbc4 |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2000, 2010, 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 #include "precompiled.hpp" |
26 #include "libadt/vectset.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/addnode.hpp" | |
29 #include "opto/c2compiler.hpp" | |
30 #include "opto/callnode.hpp" | |
31 #include "opto/cfgnode.hpp" | |
32 #include "opto/chaitin.hpp" | |
33 #include "opto/loopnode.hpp" | |
34 #include "opto/machnode.hpp" | |
0 | 35 |
36 //------------------------------Split-------------------------------------- | |
605 | 37 // Walk the graph in RPO and for each lrg which spills, propagate reaching |
38 // definitions. During propagation, split the live range around regions of | |
0 | 39 // High Register Pressure (HRP). If a Def is in a region of Low Register |
40 // Pressure (LRP), it will not get spilled until we encounter a region of | |
41 // HRP between it and one of its uses. We will spill at the transition | |
42 // point between LRP and HRP. Uses in the HRP region will use the spilled | |
43 // Def. The first Use outside the HRP region will generate a SpillCopy to | |
44 // hoist the live range back up into a register, and all subsequent uses | |
45 // will use that new Def until another HRP region is encountered. Defs in | |
46 // HRP regions will get trailing SpillCopies to push the LRG down into the | |
47 // stack immediately. | |
48 // | |
49 // As a side effect, unlink from (hence make dead) coalesced copies. | |
50 // | |
51 | |
52 static const char out_of_nodes[] = "out of nodes during split"; | |
53 | |
54 //------------------------------get_spillcopy_wide----------------------------- | |
55 // Get a SpillCopy node with wide-enough masks. Use the 'wide-mask', the | |
56 // wide ideal-register spill-mask if possible. If the 'wide-mask' does | |
57 // not cover the input (or output), use the input (or output) mask instead. | |
58 Node *PhaseChaitin::get_spillcopy_wide( Node *def, Node *use, uint uidx ) { | |
59 // If ideal reg doesn't exist we've got a bad schedule happening | |
60 // that is forcing us to spill something that isn't spillable. | |
61 // Bail rather than abort | |
62 int ireg = def->ideal_reg(); | |
63 if( ireg == 0 || ireg == Op_RegFlags ) { | |
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64 assert(false, "attempted to spill a non-spillable item"); |
0 | 65 C->record_method_not_compilable("attempted to spill a non-spillable item"); |
66 return NULL; | |
67 } | |
68 if (C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { | |
69 return NULL; | |
70 } | |
71 const RegMask *i_mask = &def->out_RegMask(); | |
72 const RegMask *w_mask = C->matcher()->idealreg2spillmask[ireg]; | |
73 const RegMask *o_mask = use ? &use->in_RegMask(uidx) : w_mask; | |
74 const RegMask *w_i_mask = w_mask->overlap( *i_mask ) ? w_mask : i_mask; | |
75 const RegMask *w_o_mask; | |
76 | |
77 if( w_mask->overlap( *o_mask ) && // Overlap AND | |
78 ((ireg != Op_RegL && ireg != Op_RegD // Single use or aligned | |
79 #ifdef _LP64 | |
80 && ireg != Op_RegP | |
81 #endif | |
82 ) || o_mask->is_aligned_Pairs()) ) { | |
83 // Don't come here for mis-aligned doubles | |
84 w_o_mask = w_mask; | |
85 } else { // wide ideal mask does not overlap with o_mask | |
86 // Mis-aligned doubles come here and XMM->FPR moves on x86. | |
87 w_o_mask = o_mask; // Must target desired registers | |
88 // Does the ideal-reg-mask overlap with o_mask? I.e., can I use | |
89 // a reg-reg move or do I need a trip across register classes | |
90 // (and thus through memory)? | |
91 if( !C->matcher()->idealreg2regmask[ireg]->overlap( *o_mask) && o_mask->is_UP() ) | |
92 // Here we assume a trip through memory is required. | |
93 w_i_mask = &C->FIRST_STACK_mask(); | |
94 } | |
95 return new (C) MachSpillCopyNode( def, *w_i_mask, *w_o_mask ); | |
96 } | |
97 | |
98 //------------------------------insert_proj------------------------------------ | |
605 | 99 // Insert the spill at chosen location. Skip over any intervening Proj's or |
0 | 100 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block |
101 // instead. Update high-pressure indices. Create a new live range. | |
102 void PhaseChaitin::insert_proj( Block *b, uint i, Node *spill, uint maxlrg ) { | |
103 // Skip intervening ProjNodes. Do not insert between a ProjNode and | |
104 // its definer. | |
105 while( i < b->_nodes.size() && | |
106 (b->_nodes[i]->is_Proj() || | |
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107 b->_nodes[i]->is_Phi() ) ) |
0 | 108 i++; |
109 | |
110 // Do not insert between a call and his Catch | |
111 if( b->_nodes[i]->is_Catch() ) { | |
112 // Put the instruction at the top of the fall-thru block. | |
113 // Find the fall-thru projection | |
114 while( 1 ) { | |
115 const CatchProjNode *cp = b->_nodes[++i]->as_CatchProj(); | |
116 if( cp->_con == CatchProjNode::fall_through_index ) | |
117 break; | |
118 } | |
119 int sidx = i - b->end_idx()-1; | |
120 b = b->_succs[sidx]; // Switch to successor block | |
121 i = 1; // Right at start of block | |
122 } | |
123 | |
124 b->_nodes.insert(i,spill); // Insert node in block | |
125 _cfg._bbs.map(spill->_idx,b); // Update node->block mapping to reflect | |
126 // Adjust the point where we go hi-pressure | |
127 if( i <= b->_ihrp_index ) b->_ihrp_index++; | |
128 if( i <= b->_fhrp_index ) b->_fhrp_index++; | |
129 | |
130 // Assign a new Live Range Number to the SpillCopy and grow | |
131 // the node->live range mapping. | |
132 new_lrg(spill,maxlrg); | |
133 } | |
134 | |
135 //------------------------------split_DEF-------------------------------------- | |
605 | 136 // There are four categories of Split; UP/DOWN x DEF/USE |
0 | 137 // Only three of these really occur as DOWN/USE will always color |
138 // Any Split with a DEF cannot CISC-Spill now. Thus we need | |
139 // two helper routines, one for Split DEFS (insert after instruction), | |
140 // one for Split USES (insert before instruction). DEF insertion | |
141 // happens inside Split, where the Leaveblock array is updated. | |
142 uint PhaseChaitin::split_DEF( Node *def, Block *b, int loc, uint maxlrg, Node **Reachblock, Node **debug_defs, GrowableArray<uint> splits, int slidx ) { | |
143 #ifdef ASSERT | |
144 // Increment the counter for this lrg | |
145 splits.at_put(slidx, splits.at(slidx)+1); | |
146 #endif | |
147 // If we are spilling the memory op for an implicit null check, at the | |
148 // null check location (ie - null check is in HRP block) we need to do | |
149 // the null-check first, then spill-down in the following block. | |
150 // (The implicit_null_check function ensures the use is also dominated | |
151 // by the branch-not-taken block.) | |
152 Node *be = b->end(); | |
153 if( be->is_MachNullCheck() && be->in(1) == def && def == b->_nodes[loc] ) { | |
154 // Spill goes in the branch-not-taken block | |
155 b = b->_succs[b->_nodes[b->end_idx()+1]->Opcode() == Op_IfTrue]; | |
156 loc = 0; // Just past the Region | |
157 } | |
158 assert( loc >= 0, "must insert past block head" ); | |
159 | |
160 // Get a def-side SpillCopy | |
161 Node *spill = get_spillcopy_wide(def,NULL,0); | |
162 // Did we fail to split?, then bail | |
163 if (!spill) { | |
164 return 0; | |
165 } | |
166 | |
167 // Insert the spill at chosen location | |
168 insert_proj( b, loc+1, spill, maxlrg++); | |
169 | |
170 // Insert new node into Reaches array | |
171 Reachblock[slidx] = spill; | |
172 // Update debug list of reaching down definitions by adding this one | |
173 debug_defs[slidx] = spill; | |
174 | |
175 // return updated count of live ranges | |
176 return maxlrg; | |
177 } | |
178 | |
179 //------------------------------split_USE-------------------------------------- | |
180 // Splits at uses can involve redeffing the LRG, so no CISC Spilling there. | |
181 // Debug uses want to know if def is already stack enabled. | |
182 uint PhaseChaitin::split_USE( Node *def, Block *b, Node *use, uint useidx, uint maxlrg, bool def_down, bool cisc_sp, GrowableArray<uint> splits, int slidx ) { | |
183 #ifdef ASSERT | |
184 // Increment the counter for this lrg | |
185 splits.at_put(slidx, splits.at(slidx)+1); | |
186 #endif | |
187 | |
188 // Some setup stuff for handling debug node uses | |
189 JVMState* jvms = use->jvms(); | |
190 uint debug_start = jvms ? jvms->debug_start() : 999999; | |
191 uint debug_end = jvms ? jvms->debug_end() : 999999; | |
192 | |
193 //------------------------------------------- | |
194 // Check for use of debug info | |
195 if (useidx >= debug_start && useidx < debug_end) { | |
196 // Actually it's perfectly legal for constant debug info to appear | |
197 // just unlikely. In this case the optimizer left a ConI of a 4 | |
198 // as both inputs to a Phi with only a debug use. It's a single-def | |
199 // live range of a rematerializable value. The live range spills, | |
200 // rematerializes and now the ConI directly feeds into the debug info. | |
201 // assert(!def->is_Con(), "constant debug info already constructed directly"); | |
202 | |
203 // Special split handling for Debug Info | |
204 // If DEF is DOWN, just hook the edge and return | |
205 // If DEF is UP, Split it DOWN for this USE. | |
206 if( def->is_Mach() ) { | |
207 if( def_down ) { | |
208 // DEF is DOWN, so connect USE directly to the DEF | |
209 use->set_req(useidx, def); | |
210 } else { | |
211 // Block and index where the use occurs. | |
212 Block *b = _cfg._bbs[use->_idx]; | |
213 // Put the clone just prior to use | |
214 int bindex = b->find_node(use); | |
215 // DEF is UP, so must copy it DOWN and hook in USE | |
216 // Insert SpillCopy before the USE, which uses DEF as its input, | |
217 // and defs a new live range, which is used by this node. | |
218 Node *spill = get_spillcopy_wide(def,use,useidx); | |
219 // did we fail to split? | |
220 if (!spill) { | |
221 // Bail | |
222 return 0; | |
223 } | |
224 // insert into basic block | |
225 insert_proj( b, bindex, spill, maxlrg++ ); | |
226 // Use the new split | |
227 use->set_req(useidx,spill); | |
228 } | |
229 // No further split handling needed for this use | |
230 return maxlrg; | |
231 } // End special splitting for debug info live range | |
232 } // If debug info | |
233 | |
234 // CISC-SPILLING | |
235 // Finally, check to see if USE is CISC-Spillable, and if so, | |
236 // gather_lrg_masks will add the flags bit to its mask, and | |
237 // no use side copy is needed. This frees up the live range | |
238 // register choices without causing copy coalescing, etc. | |
239 if( UseCISCSpill && cisc_sp ) { | |
240 int inp = use->cisc_operand(); | |
241 if( inp != AdlcVMDeps::Not_cisc_spillable ) | |
242 // Convert operand number to edge index number | |
243 inp = use->as_Mach()->operand_index(inp); | |
244 if( inp == (int)useidx ) { | |
245 use->set_req(useidx, def); | |
246 #ifndef PRODUCT | |
247 if( TraceCISCSpill ) { | |
248 tty->print(" set_split: "); | |
249 use->dump(); | |
250 } | |
251 #endif | |
252 return maxlrg; | |
253 } | |
254 } | |
255 | |
256 //------------------------------------------- | |
257 // Insert a Copy before the use | |
258 | |
259 // Block and index where the use occurs. | |
260 int bindex; | |
261 // Phi input spill-copys belong at the end of the prior block | |
262 if( use->is_Phi() ) { | |
263 b = _cfg._bbs[b->pred(useidx)->_idx]; | |
264 bindex = b->end_idx(); | |
265 } else { | |
266 // Put the clone just prior to use | |
267 bindex = b->find_node(use); | |
268 } | |
269 | |
270 Node *spill = get_spillcopy_wide( def, use, useidx ); | |
271 if( !spill ) return 0; // Bailed out | |
272 // Insert SpillCopy before the USE, which uses the reaching DEF as | |
273 // its input, and defs a new live range, which is used by this node. | |
274 insert_proj( b, bindex, spill, maxlrg++ ); | |
275 // Use the spill/clone | |
276 use->set_req(useidx,spill); | |
277 | |
278 // return updated live range count | |
279 return maxlrg; | |
280 } | |
281 | |
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282 //------------------------------clone_node---------------------------- |
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283 // Clone node with anti dependence check. |
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284 Node* clone_node(Node* def, Block *b, Compile* C) { |
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285 if (def->needs_anti_dependence_check()) { |
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286 #ifdef ASSERT |
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287 if (Verbose) { |
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288 tty->print_cr("RA attempts to clone node with anti_dependence:"); |
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289 def->dump(-1); tty->cr(); |
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290 tty->print_cr("into block:"); |
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291 b->dump(); |
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292 } |
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293 #endif |
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294 if (C->subsume_loads() == true && !C->failing()) { |
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295 // Retry with subsume_loads == false |
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296 // If this is the first failure, the sentinel string will "stick" |
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297 // to the Compile object, and the C2Compiler will see it and retry. |
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298 C->record_failure(C2Compiler::retry_no_subsuming_loads()); |
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299 } else { |
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300 // Bailout without retry |
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301 C->record_method_not_compilable("RA Split failed: attempt to clone node with anti_dependence"); |
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302 } |
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303 return 0; |
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304 } |
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305 return def->clone(); |
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306 } |
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307 |
0 | 308 //------------------------------split_Rematerialize---------------------------- |
309 // Clone a local copy of the def. | |
310 Node *PhaseChaitin::split_Rematerialize( Node *def, Block *b, uint insidx, uint &maxlrg, GrowableArray<uint> splits, int slidx, uint *lrg2reach, Node **Reachblock, bool walkThru ) { | |
311 // The input live ranges will be stretched to the site of the new | |
312 // instruction. They might be stretched past a def and will thus | |
313 // have the old and new values of the same live range alive at the | |
314 // same time - a definite no-no. Split out private copies of | |
315 // the inputs. | |
316 if( def->req() > 1 ) { | |
317 for( uint i = 1; i < def->req(); i++ ) { | |
318 Node *in = def->in(i); | |
319 // Check for single-def (LRG cannot redefined) | |
320 uint lidx = n2lidx(in); | |
321 if( lidx >= _maxlrg ) continue; // Value is a recent spill-copy | |
295
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322 if (lrgs(lidx).is_singledef()) continue; |
0 | 323 |
324 Block *b_def = _cfg._bbs[def->_idx]; | |
325 int idx_def = b_def->find_node(def); | |
326 Node *in_spill = get_spillcopy_wide( in, def, i ); | |
327 if( !in_spill ) return 0; // Bailed out | |
328 insert_proj(b_def,idx_def,in_spill,maxlrg++); | |
329 if( b_def == b ) | |
330 insidx++; | |
331 def->set_req(i,in_spill); | |
332 } | |
333 } | |
334 | |
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335 Node *spill = clone_node(def, b, C); |
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336 if (spill == NULL || C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { |
0 | 337 // Check when generating nodes |
338 return 0; | |
339 } | |
340 | |
341 // See if any inputs are currently being spilled, and take the | |
342 // latest copy of spilled inputs. | |
343 if( spill->req() > 1 ) { | |
344 for( uint i = 1; i < spill->req(); i++ ) { | |
345 Node *in = spill->in(i); | |
346 uint lidx = Find_id(in); | |
347 | |
348 // Walk backwards thru spill copy node intermediates | |
295
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349 if (walkThru) { |
0 | 350 while ( in->is_SpillCopy() && lidx >= _maxlrg ) { |
351 in = in->in(1); | |
352 lidx = Find_id(in); | |
353 } | |
354 | |
295
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355 if (lidx < _maxlrg && lrgs(lidx).is_multidef()) { |
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356 // walkThru found a multidef LRG, which is unsafe to use, so |
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357 // just keep the original def used in the clone. |
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358 in = spill->in(i); |
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359 lidx = Find_id(in); |
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360 } |
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361 } |
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362 |
0 | 363 if( lidx < _maxlrg && lrgs(lidx).reg() >= LRG::SPILL_REG ) { |
364 Node *rdef = Reachblock[lrg2reach[lidx]]; | |
365 if( rdef ) spill->set_req(i,rdef); | |
366 } | |
367 } | |
368 } | |
369 | |
370 | |
371 assert( spill->out_RegMask().is_UP(), "rematerialize to a reg" ); | |
372 // Rematerialized op is def->spilled+1 | |
373 set_was_spilled(spill); | |
374 if( _spilled_once.test(def->_idx) ) | |
375 set_was_spilled(spill); | |
376 | |
377 insert_proj( b, insidx, spill, maxlrg++ ); | |
378 #ifdef ASSERT | |
379 // Increment the counter for this lrg | |
380 splits.at_put(slidx, splits.at(slidx)+1); | |
381 #endif | |
382 // See if the cloned def kills any flags, and copy those kills as well | |
383 uint i = insidx+1; | |
384 if( clone_projs( b, i, def, spill, maxlrg ) ) { | |
385 // Adjust the point where we go hi-pressure | |
386 if( i <= b->_ihrp_index ) b->_ihrp_index++; | |
387 if( i <= b->_fhrp_index ) b->_fhrp_index++; | |
388 } | |
389 | |
390 return spill; | |
391 } | |
392 | |
393 //------------------------------is_high_pressure------------------------------- | |
394 // Function to compute whether or not this live range is "high pressure" | |
395 // in this block - whether it spills eagerly or not. | |
396 bool PhaseChaitin::is_high_pressure( Block *b, LRG *lrg, uint insidx ) { | |
397 if( lrg->_was_spilled1 ) return true; | |
398 // Forced spilling due to conflict? Then split only at binding uses | |
399 // or defs, not for supposed capacity problems. | |
400 // CNC - Turned off 7/8/99, causes too much spilling | |
401 // if( lrg->_is_bound ) return false; | |
402 | |
403 // Not yet reached the high-pressure cutoff point, so low pressure | |
404 uint hrp_idx = lrg->_is_float ? b->_fhrp_index : b->_ihrp_index; | |
405 if( insidx < hrp_idx ) return false; | |
406 // Register pressure for the block as a whole depends on reg class | |
407 int block_pres = lrg->_is_float ? b->_freg_pressure : b->_reg_pressure; | |
408 // Bound live ranges will split at the binding points first; | |
409 // Intermediate splits should assume the live range's register set | |
410 // got "freed up" and that num_regs will become INT_PRESSURE. | |
411 int bound_pres = lrg->_is_float ? FLOATPRESSURE : INTPRESSURE; | |
412 // Effective register pressure limit. | |
413 int lrg_pres = (lrg->get_invalid_mask_size() > lrg->num_regs()) | |
414 ? (lrg->get_invalid_mask_size() >> (lrg->num_regs()-1)) : bound_pres; | |
415 // High pressure if block pressure requires more register freedom | |
416 // than live range has. | |
417 return block_pres >= lrg_pres; | |
418 } | |
419 | |
420 | |
421 //------------------------------prompt_use--------------------------------- | |
422 // True if lidx is used before any real register is def'd in the block | |
423 bool PhaseChaitin::prompt_use( Block *b, uint lidx ) { | |
424 if( lrgs(lidx)._was_spilled2 ) return false; | |
425 | |
426 // Scan block for 1st use. | |
427 for( uint i = 1; i <= b->end_idx(); i++ ) { | |
428 Node *n = b->_nodes[i]; | |
429 // Ignore PHI use, these can be up or down | |
430 if( n->is_Phi() ) continue; | |
431 for( uint j = 1; j < n->req(); j++ ) | |
432 if( Find_id(n->in(j)) == lidx ) | |
433 return true; // Found 1st use! | |
434 if( n->out_RegMask().is_NotEmpty() ) return false; | |
435 } | |
436 return false; | |
437 } | |
438 | |
439 //------------------------------Split-------------------------------------- | |
440 //----------Split Routine---------- | |
441 // ***** NEW SPLITTING HEURISTIC ***** | |
442 // DEFS: If the DEF is in a High Register Pressure(HRP) Block, split there. | |
443 // Else, no split unless there is a HRP block between a DEF and | |
444 // one of its uses, and then split at the HRP block. | |
445 // | |
446 // USES: If USE is in HRP, split at use to leave main LRG on stack. | |
447 // Else, hoist LRG back up to register only (ie - split is also DEF) | |
448 // We will compute a new maxlrg as we go | |
449 uint PhaseChaitin::Split( uint maxlrg ) { | |
450 NOT_PRODUCT( Compile::TracePhase t3("regAllocSplit", &_t_regAllocSplit, TimeCompiler); ) | |
451 | |
452 uint bidx, pidx, slidx, insidx, inpidx, twoidx; | |
453 uint non_phi = 1, spill_cnt = 0; | |
454 Node **Reachblock; | |
455 Node *n1, *n2, *n3; | |
456 Node_List *defs,*phis; | |
457 bool *UPblock; | |
458 bool u1, u2, u3; | |
459 Block *b, *pred; | |
460 PhiNode *phi; | |
461 GrowableArray<uint> lidxs; | |
462 | |
463 // Array of counters to count splits per live range | |
464 GrowableArray<uint> splits; | |
465 | |
466 //----------Setup Code---------- | |
467 // Create a convenient mapping from lrg numbers to reaches/leaves indices | |
468 uint *lrg2reach = NEW_RESOURCE_ARRAY( uint, _maxlrg ); | |
469 // Keep track of DEFS & Phis for later passes | |
470 defs = new Node_List(); | |
471 phis = new Node_List(); | |
472 // Gather info on which LRG's are spilling, and build maps | |
473 for( bidx = 1; bidx < _maxlrg; bidx++ ) { | |
474 if( lrgs(bidx).alive() && lrgs(bidx).reg() >= LRG::SPILL_REG ) { | |
475 assert(!lrgs(bidx).mask().is_AllStack(),"AllStack should color"); | |
476 lrg2reach[bidx] = spill_cnt; | |
477 spill_cnt++; | |
478 lidxs.append(bidx); | |
479 #ifdef ASSERT | |
480 // Initialize the split counts to zero | |
481 splits.append(0); | |
482 #endif | |
483 #ifndef PRODUCT | |
484 if( PrintOpto && WizardMode && lrgs(bidx)._was_spilled1 ) | |
485 tty->print_cr("Warning, 2nd spill of L%d",bidx); | |
486 #endif | |
487 } | |
488 } | |
489 | |
490 // Create side arrays for propagating reaching defs info. | |
491 // Each block needs a node pointer for each spilling live range for the | |
492 // Def which is live into the block. Phi nodes handle multiple input | |
493 // Defs by querying the output of their predecessor blocks and resolving | |
494 // them to a single Def at the phi. The pointer is updated for each | |
495 // Def in the block, and then becomes the output for the block when | |
496 // processing of the block is complete. We also need to track whether | |
497 // a Def is UP or DOWN. UP means that it should get a register (ie - | |
498 // it is always in LRP regions), and DOWN means that it is probably | |
499 // on the stack (ie - it crosses HRP regions). | |
500 Node ***Reaches = NEW_RESOURCE_ARRAY( Node**, _cfg._num_blocks+1 ); | |
501 bool **UP = NEW_RESOURCE_ARRAY( bool*, _cfg._num_blocks+1 ); | |
502 Node **debug_defs = NEW_RESOURCE_ARRAY( Node*, spill_cnt ); | |
503 VectorSet **UP_entry= NEW_RESOURCE_ARRAY( VectorSet*, spill_cnt ); | |
504 | |
505 // Initialize Reaches & UP | |
506 for( bidx = 0; bidx < _cfg._num_blocks+1; bidx++ ) { | |
507 Reaches[bidx] = NEW_RESOURCE_ARRAY( Node*, spill_cnt ); | |
508 UP[bidx] = NEW_RESOURCE_ARRAY( bool, spill_cnt ); | |
509 Node **Reachblock = Reaches[bidx]; | |
510 bool *UPblock = UP[bidx]; | |
511 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
512 UPblock[slidx] = true; // Assume they start in registers | |
513 Reachblock[slidx] = NULL; // Assume that no def is present | |
514 } | |
515 } | |
516 | |
517 // Initialize to array of empty vectorsets | |
518 for( slidx = 0; slidx < spill_cnt; slidx++ ) | |
519 UP_entry[slidx] = new VectorSet(Thread::current()->resource_area()); | |
520 | |
521 //----------PASS 1---------- | |
522 //----------Propagation & Node Insertion Code---------- | |
523 // Walk the Blocks in RPO for DEF & USE info | |
524 for( bidx = 0; bidx < _cfg._num_blocks; bidx++ ) { | |
525 | |
526 if (C->check_node_count(spill_cnt, out_of_nodes)) { | |
527 return 0; | |
528 } | |
529 | |
530 b = _cfg._blocks[bidx]; | |
531 // Reaches & UP arrays for this block | |
532 Reachblock = Reaches[b->_pre_order]; | |
533 UPblock = UP[b->_pre_order]; | |
534 // Reset counter of start of non-Phi nodes in block | |
535 non_phi = 1; | |
536 //----------Block Entry Handling---------- | |
537 // Check for need to insert a new phi | |
538 // Cycle through this block's predecessors, collecting Reaches | |
539 // info for each spilled LRG. If they are identical, no phi is | |
540 // needed. If they differ, check for a phi, and insert if missing, | |
541 // or update edges if present. Set current block's Reaches set to | |
542 // be either the phi's or the reaching def, as appropriate. | |
543 // If no Phi is needed, check if the LRG needs to spill on entry | |
544 // to the block due to HRP. | |
545 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
546 // Grab the live range number | |
547 uint lidx = lidxs.at(slidx); | |
548 // Do not bother splitting or putting in Phis for single-def | |
549 // rematerialized live ranges. This happens alot to constants | |
550 // with long live ranges. | |
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551 if( lrgs(lidx).is_singledef() && |
0 | 552 lrgs(lidx)._def->rematerialize() ) { |
553 // reset the Reaches & UP entries | |
554 Reachblock[slidx] = lrgs(lidx)._def; | |
555 UPblock[slidx] = true; | |
556 // Record following instruction in case 'n' rematerializes and | |
557 // kills flags | |
558 Block *pred1 = _cfg._bbs[b->pred(1)->_idx]; | |
559 continue; | |
560 } | |
561 | |
562 // Initialize needs_phi and needs_split | |
563 bool needs_phi = false; | |
564 bool needs_split = false; | |
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565 bool has_phi = false; |
0 | 566 // Walk the predecessor blocks to check inputs for that live range |
567 // Grab predecessor block header | |
568 n1 = b->pred(1); | |
569 // Grab the appropriate reaching def info for inpidx | |
570 pred = _cfg._bbs[n1->_idx]; | |
571 pidx = pred->_pre_order; | |
572 Node **Ltmp = Reaches[pidx]; | |
573 bool *Utmp = UP[pidx]; | |
574 n1 = Ltmp[slidx]; | |
575 u1 = Utmp[slidx]; | |
576 // Initialize node for saving type info | |
577 n3 = n1; | |
578 u3 = u1; | |
579 | |
580 // Compare inputs to see if a Phi is needed | |
581 for( inpidx = 2; inpidx < b->num_preds(); inpidx++ ) { | |
582 // Grab predecessor block headers | |
583 n2 = b->pred(inpidx); | |
584 // Grab the appropriate reaching def info for inpidx | |
585 pred = _cfg._bbs[n2->_idx]; | |
586 pidx = pred->_pre_order; | |
587 Ltmp = Reaches[pidx]; | |
588 Utmp = UP[pidx]; | |
589 n2 = Ltmp[slidx]; | |
590 u2 = Utmp[slidx]; | |
591 // For each LRG, decide if a phi is necessary | |
592 if( n1 != n2 ) { | |
593 needs_phi = true; | |
594 } | |
595 // See if the phi has mismatched inputs, UP vs. DOWN | |
596 if( n1 && n2 && (u1 != u2) ) { | |
597 needs_split = true; | |
598 } | |
599 // Move n2/u2 to n1/u1 for next iteration | |
600 n1 = n2; | |
601 u1 = u2; | |
602 // Preserve a non-NULL predecessor for later type referencing | |
603 if( (n3 == NULL) && (n2 != NULL) ){ | |
604 n3 = n2; | |
605 u3 = u2; | |
606 } | |
607 } // End for all potential Phi inputs | |
608 | |
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609 // check block for appropriate phinode & update edges |
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610 for( insidx = 1; insidx <= b->end_idx(); insidx++ ) { |
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611 n1 = b->_nodes[insidx]; |
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612 // bail if this is not a phi |
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613 phi = n1->is_Phi() ? n1->as_Phi() : NULL; |
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614 if( phi == NULL ) { |
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615 // Keep track of index of first non-PhiNode instruction in block |
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616 non_phi = insidx; |
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617 // break out of the for loop as we have handled all phi nodes |
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618 break; |
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619 } |
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620 // must be looking at a phi |
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621 if( Find_id(n1) == lidxs.at(slidx) ) { |
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622 // found the necessary phi |
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623 needs_phi = false; |
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624 has_phi = true; |
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625 // initialize the Reaches entry for this LRG |
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626 Reachblock[slidx] = phi; |
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627 break; |
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628 } // end if found correct phi |
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629 } // end for all phi's |
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630 |
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631 // If a phi is needed or exist, check for it |
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632 if( needs_phi || has_phi ) { |
0 | 633 // add new phinode if one not already found |
634 if( needs_phi ) { | |
635 // create a new phi node and insert it into the block | |
636 // type is taken from left over pointer to a predecessor | |
637 assert(n3,"No non-NULL reaching DEF for a Phi"); | |
638 phi = new (C, b->num_preds()) PhiNode(b->head(), n3->bottom_type()); | |
639 // initialize the Reaches entry for this LRG | |
640 Reachblock[slidx] = phi; | |
641 | |
642 // add node to block & node_to_block mapping | |
643 insert_proj( b, insidx++, phi, maxlrg++ ); | |
644 non_phi++; | |
645 // Reset new phi's mapping to be the spilling live range | |
646 _names.map(phi->_idx, lidx); | |
647 assert(Find_id(phi) == lidx,"Bad update on Union-Find mapping"); | |
648 } // end if not found correct phi | |
649 // Here you have either found or created the Phi, so record it | |
650 assert(phi != NULL,"Must have a Phi Node here"); | |
651 phis->push(phi); | |
652 // PhiNodes should either force the LRG UP or DOWN depending | |
653 // on its inputs and the register pressure in the Phi's block. | |
654 UPblock[slidx] = true; // Assume new DEF is UP | |
655 // If entering a high-pressure area with no immediate use, | |
656 // assume Phi is DOWN | |
657 if( is_high_pressure( b, &lrgs(lidx), b->end_idx()) && !prompt_use(b,lidx) ) | |
658 UPblock[slidx] = false; | |
659 // If we are not split up/down and all inputs are down, then we | |
660 // are down | |
661 if( !needs_split && !u3 ) | |
662 UPblock[slidx] = false; | |
663 } // end if phi is needed | |
664 | |
665 // Do not need a phi, so grab the reaching DEF | |
666 else { | |
667 // Grab predecessor block header | |
668 n1 = b->pred(1); | |
669 // Grab the appropriate reaching def info for k | |
670 pred = _cfg._bbs[n1->_idx]; | |
671 pidx = pred->_pre_order; | |
672 Node **Ltmp = Reaches[pidx]; | |
673 bool *Utmp = UP[pidx]; | |
674 // reset the Reaches & UP entries | |
675 Reachblock[slidx] = Ltmp[slidx]; | |
676 UPblock[slidx] = Utmp[slidx]; | |
677 } // end else no Phi is needed | |
678 } // end for all spilling live ranges | |
679 // DEBUG | |
680 #ifndef PRODUCT | |
681 if(trace_spilling()) { | |
682 tty->print("/`\nBlock %d: ", b->_pre_order); | |
683 tty->print("Reaching Definitions after Phi handling\n"); | |
684 for( uint x = 0; x < spill_cnt; x++ ) { | |
685 tty->print("Spill Idx %d: UP %d: Node\n",x,UPblock[x]); | |
686 if( Reachblock[x] ) | |
687 Reachblock[x]->dump(); | |
688 else | |
689 tty->print("Undefined\n"); | |
690 } | |
691 } | |
692 #endif | |
693 | |
694 //----------Non-Phi Node Splitting---------- | |
695 // Since phi-nodes have now been handled, the Reachblock array for this | |
696 // block is initialized with the correct starting value for the defs which | |
697 // reach non-phi instructions in this block. Thus, process non-phi | |
698 // instructions normally, inserting SpillCopy nodes for all spill | |
699 // locations. | |
700 | |
701 // Memoize any DOWN reaching definitions for use as DEBUG info | |
702 for( insidx = 0; insidx < spill_cnt; insidx++ ) { | |
703 debug_defs[insidx] = (UPblock[insidx]) ? NULL : Reachblock[insidx]; | |
704 if( UPblock[insidx] ) // Memoize UP decision at block start | |
705 UP_entry[insidx]->set( b->_pre_order ); | |
706 } | |
707 | |
708 //----------Walk Instructions in the Block and Split---------- | |
709 // For all non-phi instructions in the block | |
710 for( insidx = 1; insidx <= b->end_idx(); insidx++ ) { | |
711 Node *n = b->_nodes[insidx]; | |
712 // Find the defining Node's live range index | |
713 uint defidx = Find_id(n); | |
714 uint cnt = n->req(); | |
715 | |
716 if( n->is_Phi() ) { | |
717 // Skip phi nodes after removing dead copies. | |
718 if( defidx < _maxlrg ) { | |
719 // Check for useless Phis. These appear if we spill, then | |
720 // coalesce away copies. Dont touch Phis in spilling live | |
721 // ranges; they are busy getting modifed in this pass. | |
722 if( lrgs(defidx).reg() < LRG::SPILL_REG ) { | |
723 uint i; | |
724 Node *u = NULL; | |
725 // Look for the Phi merging 2 unique inputs | |
726 for( i = 1; i < cnt; i++ ) { | |
727 // Ignore repeats and self | |
728 if( n->in(i) != u && n->in(i) != n ) { | |
729 // Found a unique input | |
730 if( u != NULL ) // If it's the 2nd, bail out | |
731 break; | |
732 u = n->in(i); // Else record it | |
733 } | |
734 } | |
735 assert( u, "at least 1 valid input expected" ); | |
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736 if( i >= cnt ) { // Found one unique input |
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737 assert(Find_id(n) == Find_id(u), "should be the same lrg"); |
0 | 738 n->replace_by(u); // Then replace with unique input |
739 n->disconnect_inputs(NULL); | |
740 b->_nodes.remove(insidx); | |
741 insidx--; | |
742 b->_ihrp_index--; | |
743 b->_fhrp_index--; | |
744 } | |
745 } | |
746 } | |
747 continue; | |
748 } | |
749 assert( insidx > b->_ihrp_index || | |
750 (b->_reg_pressure < (uint)INTPRESSURE) || | |
751 b->_ihrp_index > 4000000 || | |
752 b->_ihrp_index >= b->end_idx() || | |
753 !b->_nodes[b->_ihrp_index]->is_Proj(), "" ); | |
754 assert( insidx > b->_fhrp_index || | |
755 (b->_freg_pressure < (uint)FLOATPRESSURE) || | |
756 b->_fhrp_index > 4000000 || | |
757 b->_fhrp_index >= b->end_idx() || | |
758 !b->_nodes[b->_fhrp_index]->is_Proj(), "" ); | |
759 | |
760 // ********** Handle Crossing HRP Boundry ********** | |
761 if( (insidx == b->_ihrp_index) || (insidx == b->_fhrp_index) ) { | |
762 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
605 | 763 // Check for need to split at HRP boundary - split if UP |
0 | 764 n1 = Reachblock[slidx]; |
765 // bail out if no reaching DEF | |
766 if( n1 == NULL ) continue; | |
767 // bail out if live range is 'isolated' around inner loop | |
768 uint lidx = lidxs.at(slidx); | |
769 // If live range is currently UP | |
770 if( UPblock[slidx] ) { | |
771 // set location to insert spills at | |
772 // SPLIT DOWN HERE - NO CISC SPILL | |
773 if( is_high_pressure( b, &lrgs(lidx), insidx ) && | |
774 !n1->rematerialize() ) { | |
775 // If there is already a valid stack definition available, use it | |
776 if( debug_defs[slidx] != NULL ) { | |
777 Reachblock[slidx] = debug_defs[slidx]; | |
778 } | |
779 else { | |
780 // Insert point is just past last use or def in the block | |
781 int insert_point = insidx-1; | |
782 while( insert_point > 0 ) { | |
783 Node *n = b->_nodes[insert_point]; | |
784 // Hit top of block? Quit going backwards | |
785 if( n->is_Phi() ) break; | |
786 // Found a def? Better split after it. | |
787 if( n2lidx(n) == lidx ) break; | |
788 // Look for a use | |
789 uint i; | |
790 for( i = 1; i < n->req(); i++ ) | |
791 if( n2lidx(n->in(i)) == lidx ) | |
792 break; | |
793 // Found a use? Better split after it. | |
794 if( i < n->req() ) break; | |
795 insert_point--; | |
796 } | |
797 maxlrg = split_DEF( n1, b, insert_point, maxlrg, Reachblock, debug_defs, splits, slidx); | |
798 // If it wasn't split bail | |
799 if (!maxlrg) { | |
800 return 0; | |
801 } | |
802 insidx++; | |
803 } | |
804 // This is a new DEF, so update UP | |
805 UPblock[slidx] = false; | |
806 #ifndef PRODUCT | |
807 // DEBUG | |
808 if( trace_spilling() ) { | |
809 tty->print("\nNew Split DOWN DEF of Spill Idx "); | |
810 tty->print("%d, UP %d:\n",slidx,false); | |
811 n1->dump(); | |
812 } | |
813 #endif | |
814 } | |
815 } // end if LRG is UP | |
816 } // end for all spilling live ranges | |
817 assert( b->_nodes[insidx] == n, "got insidx set incorrectly" ); | |
818 } // end if crossing HRP Boundry | |
819 | |
820 // If the LRG index is oob, then this is a new spillcopy, skip it. | |
821 if( defidx >= _maxlrg ) { | |
822 continue; | |
823 } | |
824 LRG &deflrg = lrgs(defidx); | |
825 uint copyidx = n->is_Copy(); | |
826 // Remove coalesced copy from CFG | |
827 if( copyidx && defidx == n2lidx(n->in(copyidx)) ) { | |
828 n->replace_by( n->in(copyidx) ); | |
829 n->set_req( copyidx, NULL ); | |
830 b->_nodes.remove(insidx--); | |
831 b->_ihrp_index--; // Adjust the point where we go hi-pressure | |
832 b->_fhrp_index--; | |
833 continue; | |
834 } | |
835 | |
836 #define DERIVED 0 | |
837 | |
838 // ********** Handle USES ********** | |
839 bool nullcheck = false; | |
840 // Implicit null checks never use the spilled value | |
841 if( n->is_MachNullCheck() ) | |
842 nullcheck = true; | |
843 if( !nullcheck ) { | |
844 // Search all inputs for a Spill-USE | |
845 JVMState* jvms = n->jvms(); | |
846 uint oopoff = jvms ? jvms->oopoff() : cnt; | |
847 uint old_last = cnt - 1; | |
848 for( inpidx = 1; inpidx < cnt; inpidx++ ) { | |
849 // Derived/base pairs may be added to our inputs during this loop. | |
850 // If inpidx > old_last, then one of these new inputs is being | |
851 // handled. Skip the derived part of the pair, but process | |
852 // the base like any other input. | |
853 if( inpidx > old_last && ((inpidx - oopoff) & 1) == DERIVED ) { | |
854 continue; // skip derived_debug added below | |
855 } | |
856 // Get lidx of input | |
857 uint useidx = Find_id(n->in(inpidx)); | |
858 // Not a brand-new split, and it is a spill use | |
859 if( useidx < _maxlrg && lrgs(useidx).reg() >= LRG::SPILL_REG ) { | |
860 // Check for valid reaching DEF | |
861 slidx = lrg2reach[useidx]; | |
862 Node *def = Reachblock[slidx]; | |
863 assert( def != NULL, "Using Undefined Value in Split()\n"); | |
864 | |
865 // (+++) %%%% remove this in favor of pre-pass in matcher.cpp | |
866 // monitor references do not care where they live, so just hook | |
867 if ( jvms && jvms->is_monitor_use(inpidx) ) { | |
868 // The effect of this clone is to drop the node out of the block, | |
869 // so that the allocator does not see it anymore, and therefore | |
870 // does not attempt to assign it a register. | |
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871 def = clone_node(def, b, C); |
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872 if (def == NULL || C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { |
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873 return 0; |
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874 } |
0 | 875 _names.extend(def->_idx,0); |
876 _cfg._bbs.map(def->_idx,b); | |
877 n->set_req(inpidx, def); | |
878 continue; | |
879 } | |
880 | |
881 // Rematerializable? Then clone def at use site instead | |
882 // of store/load | |
883 if( def->rematerialize() ) { | |
884 int old_size = b->_nodes.size(); | |
885 def = split_Rematerialize( def, b, insidx, maxlrg, splits, slidx, lrg2reach, Reachblock, true ); | |
886 if( !def ) return 0; // Bail out | |
887 insidx += b->_nodes.size()-old_size; | |
888 } | |
889 | |
890 MachNode *mach = n->is_Mach() ? n->as_Mach() : NULL; | |
891 // Base pointers and oopmap references do not care where they live. | |
892 if ((inpidx >= oopoff) || | |
893 (mach && mach->ideal_Opcode() == Op_AddP && inpidx == AddPNode::Base)) { | |
894 if (def->rematerialize() && lrgs(useidx)._was_spilled2) { | |
895 // This def has been rematerialized a couple of times without | |
896 // progress. It doesn't care if it lives UP or DOWN, so | |
897 // spill it down now. | |
898 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false,splits,slidx); | |
899 // If it wasn't split bail | |
900 if (!maxlrg) { | |
901 return 0; | |
902 } | |
903 insidx++; // Reset iterator to skip USE side split | |
904 } else { | |
905 // Just hook the def edge | |
906 n->set_req(inpidx, def); | |
907 } | |
908 | |
909 if (inpidx >= oopoff) { | |
910 // After oopoff, we have derived/base pairs. We must mention all | |
911 // derived pointers here as derived/base pairs for GC. If the | |
912 // derived value is spilling and we have a copy both in Reachblock | |
913 // (called here 'def') and debug_defs[slidx] we need to mention | |
914 // both in derived/base pairs or kill one. | |
915 Node *derived_debug = debug_defs[slidx]; | |
916 if( ((inpidx - oopoff) & 1) == DERIVED && // derived vs base? | |
917 mach && mach->ideal_Opcode() != Op_Halt && | |
918 derived_debug != NULL && | |
919 derived_debug != def ) { // Actual 2nd value appears | |
920 // We have already set 'def' as a derived value. | |
921 // Also set debug_defs[slidx] as a derived value. | |
922 uint k; | |
923 for( k = oopoff; k < cnt; k += 2 ) | |
924 if( n->in(k) == derived_debug ) | |
925 break; // Found an instance of debug derived | |
926 if( k == cnt ) {// No instance of debug_defs[slidx] | |
927 // Add a derived/base pair to cover the debug info. | |
928 // We have to process the added base later since it is not | |
929 // handled yet at this point but skip derived part. | |
930 assert(((n->req() - oopoff) & 1) == DERIVED, | |
931 "must match skip condition above"); | |
932 n->add_req( derived_debug ); // this will be skipped above | |
933 n->add_req( n->in(inpidx+1) ); // this will be processed | |
934 // Increment cnt to handle added input edges on | |
935 // subsequent iterations. | |
936 cnt += 2; | |
937 } | |
938 } | |
939 } | |
940 continue; | |
941 } | |
942 // Special logic for DEBUG info | |
943 if( jvms && b->_freq > BLOCK_FREQUENCY(0.5) ) { | |
944 uint debug_start = jvms->debug_start(); | |
945 // If this is debug info use & there is a reaching DOWN def | |
946 if ((debug_start <= inpidx) && (debug_defs[slidx] != NULL)) { | |
947 assert(inpidx < oopoff, "handle only debug info here"); | |
948 // Just hook it in & move on | |
949 n->set_req(inpidx, debug_defs[slidx]); | |
950 // (Note that this can make two sides of a split live at the | |
951 // same time: The debug def on stack, and another def in a | |
952 // register. The GC needs to know about both of them, but any | |
953 // derived pointers after oopoff will refer to only one of the | |
954 // two defs and the GC would therefore miss the other. Thus | |
955 // this hack is only allowed for debug info which is Java state | |
956 // and therefore never a derived pointer.) | |
957 continue; | |
958 } | |
959 } | |
960 // Grab register mask info | |
961 const RegMask &dmask = def->out_RegMask(); | |
962 const RegMask &umask = n->in_RegMask(inpidx); | |
963 | |
964 assert(inpidx < oopoff, "cannot use-split oop map info"); | |
965 | |
966 bool dup = UPblock[slidx]; | |
967 bool uup = umask.is_UP(); | |
968 | |
969 // Need special logic to handle bound USES. Insert a split at this | |
970 // bound use if we can't rematerialize the def, or if we need the | |
971 // split to form a misaligned pair. | |
972 if( !umask.is_AllStack() && | |
973 (int)umask.Size() <= lrgs(useidx).num_regs() && | |
974 (!def->rematerialize() || | |
975 umask.is_misaligned_Pair())) { | |
976 // These need a Split regardless of overlap or pressure | |
977 // SPLIT - NO DEF - NO CISC SPILL | |
978 maxlrg = split_USE(def,b,n,inpidx,maxlrg,dup,false, splits,slidx); | |
979 // If it wasn't split bail | |
980 if (!maxlrg) { | |
981 return 0; | |
982 } | |
983 insidx++; // Reset iterator to skip USE side split | |
984 continue; | |
985 } | |
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986 |
3842 | 987 if (UseFPUForSpilling && n->is_MachCall() && !uup && !dup ) { |
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988 // The use at the call can force the def down so insert |
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989 // a split before the use to allow the def more freedom. |
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990 maxlrg = split_USE(def,b,n,inpidx,maxlrg,dup,false, splits,slidx); |
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991 // If it wasn't split bail |
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992 if (!maxlrg) { |
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993 return 0; |
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994 } |
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995 insidx++; // Reset iterator to skip USE side split |
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996 continue; |
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997 } |
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998 |
0 | 999 // Here is the logic chart which describes USE Splitting: |
1000 // 0 = false or DOWN, 1 = true or UP | |
1001 // | |
1002 // Overlap | DEF | USE | Action | |
1003 //------------------------------------------------------- | |
1004 // 0 | 0 | 0 | Copy - mem -> mem | |
1005 // 0 | 0 | 1 | Split-UP - Check HRP | |
1006 // 0 | 1 | 0 | Split-DOWN - Debug Info? | |
1007 // 0 | 1 | 1 | Copy - reg -> reg | |
1008 // 1 | 0 | 0 | Reset Input Edge (no Split) | |
1009 // 1 | 0 | 1 | Split-UP - Check HRP | |
1010 // 1 | 1 | 0 | Split-DOWN - Debug Info? | |
1011 // 1 | 1 | 1 | Reset Input Edge (no Split) | |
1012 // | |
1013 // So, if (dup == uup), then overlap test determines action, | |
1014 // with true being no split, and false being copy. Else, | |
1015 // if DEF is DOWN, Split-UP, and check HRP to decide on | |
1016 // resetting DEF. Finally if DEF is UP, Split-DOWN, with | |
1017 // special handling for Debug Info. | |
1018 if( dup == uup ) { | |
1019 if( dmask.overlap(umask) ) { | |
1020 // Both are either up or down, and there is overlap, No Split | |
1021 n->set_req(inpidx, def); | |
1022 } | |
1023 else { // Both are either up or down, and there is no overlap | |
1024 if( dup ) { // If UP, reg->reg copy | |
1025 // COPY ACROSS HERE - NO DEF - NO CISC SPILL | |
1026 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1027 // If it wasn't split bail | |
1028 if (!maxlrg) { | |
1029 return 0; | |
1030 } | |
1031 insidx++; // Reset iterator to skip USE side split | |
1032 } | |
1033 else { // DOWN, mem->mem copy | |
1034 // COPY UP & DOWN HERE - NO DEF - NO CISC SPILL | |
1035 // First Split-UP to move value into Register | |
1036 uint def_ideal = def->ideal_reg(); | |
1037 const RegMask* tmp_rm = Matcher::idealreg2regmask[def_ideal]; | |
1038 Node *spill = new (C) MachSpillCopyNode(def, dmask, *tmp_rm); | |
1039 insert_proj( b, insidx, spill, maxlrg ); | |
1040 // Then Split-DOWN as if previous Split was DEF | |
1041 maxlrg = split_USE(spill,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1042 // If it wasn't split bail | |
1043 if (!maxlrg) { | |
1044 return 0; | |
1045 } | |
1046 insidx += 2; // Reset iterator to skip USE side splits | |
1047 } | |
1048 } // End else no overlap | |
1049 } // End if dup == uup | |
1050 // dup != uup, so check dup for direction of Split | |
1051 else { | |
1052 if( dup ) { // If UP, Split-DOWN and check Debug Info | |
1053 // If this node is already a SpillCopy, just patch the edge | |
1054 // except the case of spilling to stack. | |
1055 if( n->is_SpillCopy() ) { | |
1056 RegMask tmp_rm(umask); | |
1057 tmp_rm.SUBTRACT(Matcher::STACK_ONLY_mask); | |
1058 if( dmask.overlap(tmp_rm) ) { | |
1059 if( def != n->in(inpidx) ) { | |
1060 n->set_req(inpidx, def); | |
1061 } | |
1062 continue; | |
1063 } | |
1064 } | |
1065 // COPY DOWN HERE - NO DEF - NO CISC SPILL | |
1066 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1067 // If it wasn't split bail | |
1068 if (!maxlrg) { | |
1069 return 0; | |
1070 } | |
1071 insidx++; // Reset iterator to skip USE side split | |
1072 // Check for debug-info split. Capture it for later | |
1073 // debug splits of the same value | |
1074 if (jvms && jvms->debug_start() <= inpidx && inpidx < oopoff) | |
1075 debug_defs[slidx] = n->in(inpidx); | |
1076 | |
1077 } | |
1078 else { // DOWN, Split-UP and check register pressure | |
1079 if( is_high_pressure( b, &lrgs(useidx), insidx ) ) { | |
1080 // COPY UP HERE - NO DEF - CISC SPILL | |
1081 maxlrg = split_USE(def,b,n,inpidx,maxlrg,true,true, splits,slidx); | |
1082 // If it wasn't split bail | |
1083 if (!maxlrg) { | |
1084 return 0; | |
1085 } | |
1086 insidx++; // Reset iterator to skip USE side split | |
1087 } else { // LRP | |
1088 // COPY UP HERE - WITH DEF - NO CISC SPILL | |
1089 maxlrg = split_USE(def,b,n,inpidx,maxlrg,true,false, splits,slidx); | |
1090 // If it wasn't split bail | |
1091 if (!maxlrg) { | |
1092 return 0; | |
1093 } | |
1094 // Flag this lift-up in a low-pressure block as | |
1095 // already-spilled, so if it spills again it will | |
1096 // spill hard (instead of not spilling hard and | |
1097 // coalescing away). | |
1098 set_was_spilled(n->in(inpidx)); | |
1099 // Since this is a new DEF, update Reachblock & UP | |
1100 Reachblock[slidx] = n->in(inpidx); | |
1101 UPblock[slidx] = true; | |
1102 insidx++; // Reset iterator to skip USE side split | |
1103 } | |
1104 } // End else DOWN | |
1105 } // End dup != uup | |
1106 } // End if Spill USE | |
1107 } // End For All Inputs | |
1108 } // End If not nullcheck | |
1109 | |
1110 // ********** Handle DEFS ********** | |
1111 // DEFS either Split DOWN in HRP regions or when the LRG is bound, or | |
1112 // just reset the Reaches info in LRP regions. DEFS must always update | |
1113 // UP info. | |
1114 if( deflrg.reg() >= LRG::SPILL_REG ) { // Spilled? | |
1115 uint slidx = lrg2reach[defidx]; | |
1116 // Add to defs list for later assignment of new live range number | |
1117 defs->push(n); | |
1118 // Set a flag on the Node indicating it has already spilled. | |
1119 // Only do it for capacity spills not conflict spills. | |
1120 if( !deflrg._direct_conflict ) | |
1121 set_was_spilled(n); | |
1122 assert(!n->is_Phi(),"Cannot insert Phi into DEFS list"); | |
1123 // Grab UP info for DEF | |
1124 const RegMask &dmask = n->out_RegMask(); | |
1125 bool defup = dmask.is_UP(); | |
1126 // Only split at Def if this is a HRP block or bound (and spilled once) | |
1127 if( !n->rematerialize() && | |
1128 (((dmask.is_bound1() || dmask.is_bound2() || dmask.is_misaligned_Pair()) && | |
1129 (deflrg._direct_conflict || deflrg._must_spill)) || | |
1130 // Check for LRG being up in a register and we are inside a high | |
1131 // pressure area. Spill it down immediately. | |
1132 (defup && is_high_pressure(b,&deflrg,insidx))) ) { | |
1133 assert( !n->rematerialize(), "" ); | |
1134 assert( !n->is_SpillCopy(), "" ); | |
1135 // Do a split at the def site. | |
1136 maxlrg = split_DEF( n, b, insidx, maxlrg, Reachblock, debug_defs, splits, slidx ); | |
1137 // If it wasn't split bail | |
1138 if (!maxlrg) { | |
1139 return 0; | |
1140 } | |
1141 // Split DEF's Down | |
1142 UPblock[slidx] = 0; | |
1143 #ifndef PRODUCT | |
1144 // DEBUG | |
1145 if( trace_spilling() ) { | |
1146 tty->print("\nNew Split DOWN DEF of Spill Idx "); | |
1147 tty->print("%d, UP %d:\n",slidx,false); | |
1148 n->dump(); | |
1149 } | |
1150 #endif | |
1151 } | |
1152 else { // Neither bound nor HRP, must be LRP | |
1153 // otherwise, just record the def | |
1154 Reachblock[slidx] = n; | |
1155 // UP should come from the outRegmask() of the DEF | |
1156 UPblock[slidx] = defup; | |
1157 // Update debug list of reaching down definitions, kill if DEF is UP | |
1158 debug_defs[slidx] = defup ? NULL : n; | |
1159 #ifndef PRODUCT | |
1160 // DEBUG | |
1161 if( trace_spilling() ) { | |
1162 tty->print("\nNew DEF of Spill Idx "); | |
1163 tty->print("%d, UP %d:\n",slidx,defup); | |
1164 n->dump(); | |
1165 } | |
1166 #endif | |
1167 } // End else LRP | |
1168 } // End if spill def | |
1169 | |
1170 // ********** Split Left Over Mem-Mem Moves ********** | |
1171 // Check for mem-mem copies and split them now. Do not do this | |
1172 // to copies about to be spilled; they will be Split shortly. | |
1173 if( copyidx ) { | |
1174 Node *use = n->in(copyidx); | |
1175 uint useidx = Find_id(use); | |
1176 if( useidx < _maxlrg && // This is not a new split | |
1177 OptoReg::is_stack(deflrg.reg()) && | |
1178 deflrg.reg() < LRG::SPILL_REG ) { // And DEF is from stack | |
1179 LRG &uselrg = lrgs(useidx); | |
1180 if( OptoReg::is_stack(uselrg.reg()) && | |
1181 uselrg.reg() < LRG::SPILL_REG && // USE is from stack | |
1182 deflrg.reg() != uselrg.reg() ) { // Not trivially removed | |
1183 uint def_ideal_reg = Matcher::base2reg[n->bottom_type()->base()]; | |
1184 const RegMask &def_rm = *Matcher::idealreg2regmask[def_ideal_reg]; | |
1185 const RegMask &use_rm = n->in_RegMask(copyidx); | |
1186 if( def_rm.overlap(use_rm) && n->is_SpillCopy() ) { // Bug 4707800, 'n' may be a storeSSL | |
1187 if (C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { // Check when generating nodes | |
1188 return 0; | |
1189 } | |
1190 Node *spill = new (C) MachSpillCopyNode(use,use_rm,def_rm); | |
1191 n->set_req(copyidx,spill); | |
1192 n->as_MachSpillCopy()->set_in_RegMask(def_rm); | |
1193 // Put the spill just before the copy | |
1194 insert_proj( b, insidx++, spill, maxlrg++ ); | |
1195 } | |
1196 } | |
1197 } | |
1198 } | |
1199 } // End For All Instructions in Block - Non-PHI Pass | |
1200 | |
1201 // Check if each LRG is live out of this block so as not to propagate | |
1202 // beyond the last use of a LRG. | |
1203 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
1204 uint defidx = lidxs.at(slidx); | |
1205 IndexSet *liveout = _live->live(b); | |
1206 if( !liveout->member(defidx) ) { | |
1207 #ifdef ASSERT | |
1208 // The index defidx is not live. Check the liveout array to ensure that | |
1209 // it contains no members which compress to defidx. Finding such an | |
1210 // instance may be a case to add liveout adjustment in compress_uf_map(). | |
1211 // See 5063219. | |
1212 uint member; | |
1213 IndexSetIterator isi(liveout); | |
1214 while ((member = isi.next()) != 0) { | |
1215 assert(defidx != Find_const(member), "Live out member has not been compressed"); | |
1216 } | |
1217 #endif | |
1218 Reachblock[slidx] = NULL; | |
1219 } else { | |
1220 assert(Reachblock[slidx] != NULL,"No reaching definition for liveout value"); | |
1221 } | |
1222 } | |
1223 #ifndef PRODUCT | |
1224 if( trace_spilling() ) | |
1225 b->dump(); | |
1226 #endif | |
1227 } // End For All Blocks | |
1228 | |
1229 //----------PASS 2---------- | |
1230 // Reset all DEF live range numbers here | |
1231 for( insidx = 0; insidx < defs->size(); insidx++ ) { | |
1232 // Grab the def | |
1233 n1 = defs->at(insidx); | |
1234 // Set new lidx for DEF | |
1235 new_lrg(n1, maxlrg++); | |
1236 } | |
1237 //----------Phi Node Splitting---------- | |
1238 // Clean up a phi here, and assign a new live range number | |
1239 // Cycle through this block's predecessors, collecting Reaches | |
1240 // info for each spilled LRG and update edges. | |
1241 // Walk the phis list to patch inputs, split phis, and name phis | |
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1242 uint lrgs_before_phi_split = maxlrg; |
0 | 1243 for( insidx = 0; insidx < phis->size(); insidx++ ) { |
1244 Node *phi = phis->at(insidx); | |
1245 assert(phi->is_Phi(),"This list must only contain Phi Nodes"); | |
1246 Block *b = _cfg._bbs[phi->_idx]; | |
1247 // Grab the live range number | |
1248 uint lidx = Find_id(phi); | |
1249 uint slidx = lrg2reach[lidx]; | |
1250 // Update node to lidx map | |
1251 new_lrg(phi, maxlrg++); | |
1252 // Get PASS1's up/down decision for the block. | |
1253 int phi_up = !!UP_entry[slidx]->test(b->_pre_order); | |
1254 | |
1255 // Force down if double-spilling live range | |
1256 if( lrgs(lidx)._was_spilled1 ) | |
1257 phi_up = false; | |
1258 | |
1259 // When splitting a Phi we an split it normal or "inverted". | |
1260 // An inverted split makes the splits target the Phi's UP/DOWN | |
1261 // sense inverted; then the Phi is followed by a final def-side | |
1262 // split to invert back. It changes which blocks the spill code | |
1263 // goes in. | |
1264 | |
1265 // Walk the predecessor blocks and assign the reaching def to the Phi. | |
1266 // Split Phi nodes by placing USE side splits wherever the reaching | |
1267 // DEF has the wrong UP/DOWN value. | |
1268 for( uint i = 1; i < b->num_preds(); i++ ) { | |
1269 // Get predecessor block pre-order number | |
1270 Block *pred = _cfg._bbs[b->pred(i)->_idx]; | |
1271 pidx = pred->_pre_order; | |
1272 // Grab reaching def | |
1273 Node *def = Reaches[pidx][slidx]; | |
1274 assert( def, "must have reaching def" ); | |
1275 // If input up/down sense and reg-pressure DISagree | |
1276 if( def->rematerialize() ) { | |
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1277 // Place the rematerialized node above any MSCs created during |
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1278 // phi node splitting. end_idx points at the insertion point |
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1279 // so look at the node before it. |
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1280 int insert = pred->end_idx(); |
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1281 while (insert >= 1 && |
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1282 pred->_nodes[insert - 1]->is_SpillCopy() && |
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1283 Find(pred->_nodes[insert - 1]) >= lrgs_before_phi_split) { |
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1284 insert--; |
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1285 } |
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1286 def = split_Rematerialize( def, pred, insert, maxlrg, splits, slidx, lrg2reach, Reachblock, false ); |
0 | 1287 if( !def ) return 0; // Bail out |
1288 } | |
1289 // Update the Phi's input edge array | |
1290 phi->set_req(i,def); | |
1291 // Grab the UP/DOWN sense for the input | |
1292 u1 = UP[pidx][slidx]; | |
1293 if( u1 != (phi_up != 0)) { | |
1294 maxlrg = split_USE(def, b, phi, i, maxlrg, !u1, false, splits,slidx); | |
1295 // If it wasn't split bail | |
1296 if (!maxlrg) { | |
1297 return 0; | |
1298 } | |
1299 } | |
1300 } // End for all inputs to the Phi | |
1301 } // End for all Phi Nodes | |
1302 // Update _maxlrg to save Union asserts | |
1303 _maxlrg = maxlrg; | |
1304 | |
1305 | |
1306 //----------PASS 3---------- | |
1307 // Pass over all Phi's to union the live ranges | |
1308 for( insidx = 0; insidx < phis->size(); insidx++ ) { | |
1309 Node *phi = phis->at(insidx); | |
1310 assert(phi->is_Phi(),"This list must only contain Phi Nodes"); | |
1311 // Walk all inputs to Phi and Union input live range with Phi live range | |
1312 for( uint i = 1; i < phi->req(); i++ ) { | |
1313 // Grab the input node | |
1314 Node *n = phi->in(i); | |
1315 assert( n, "" ); | |
1316 uint lidx = Find(n); | |
1317 uint pidx = Find(phi); | |
1318 if( lidx < pidx ) | |
1319 Union(n, phi); | |
1320 else if( lidx > pidx ) | |
1321 Union(phi, n); | |
1322 } // End for all inputs to the Phi Node | |
1323 } // End for all Phi Nodes | |
1324 // Now union all two address instructions | |
1325 for( insidx = 0; insidx < defs->size(); insidx++ ) { | |
1326 // Grab the def | |
1327 n1 = defs->at(insidx); | |
1328 // Set new lidx for DEF & handle 2-addr instructions | |
1329 if( n1->is_Mach() && ((twoidx = n1->as_Mach()->two_adr()) != 0) ) { | |
1330 assert( Find(n1->in(twoidx)) < maxlrg,"Assigning bad live range index"); | |
1331 // Union the input and output live ranges | |
1332 uint lr1 = Find(n1); | |
1333 uint lr2 = Find(n1->in(twoidx)); | |
1334 if( lr1 < lr2 ) | |
1335 Union(n1, n1->in(twoidx)); | |
1336 else if( lr1 > lr2 ) | |
1337 Union(n1->in(twoidx), n1); | |
1338 } // End if two address | |
1339 } // End for all defs | |
1340 // DEBUG | |
1341 #ifdef ASSERT | |
1342 // Validate all live range index assignments | |
1343 for( bidx = 0; bidx < _cfg._num_blocks; bidx++ ) { | |
1344 b = _cfg._blocks[bidx]; | |
1345 for( insidx = 0; insidx <= b->end_idx(); insidx++ ) { | |
1346 Node *n = b->_nodes[insidx]; | |
1347 uint defidx = Find(n); | |
1348 assert(defidx < _maxlrg,"Bad live range index in Split"); | |
1349 assert(defidx < maxlrg,"Bad live range index in Split"); | |
1350 } | |
1351 } | |
1352 // Issue a warning if splitting made no progress | |
1353 int noprogress = 0; | |
1354 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
1355 if( PrintOpto && WizardMode && splits.at(slidx) == 0 ) { | |
1356 tty->print_cr("Failed to split live range %d", lidxs.at(slidx)); | |
1357 //BREAKPOINT; | |
1358 } | |
1359 else { | |
1360 noprogress++; | |
1361 } | |
1362 } | |
1363 if(!noprogress) { | |
1364 tty->print_cr("Failed to make progress in Split"); | |
1365 //BREAKPOINT; | |
1366 } | |
1367 #endif | |
1368 // Return updated count of live ranges | |
1369 return maxlrg; | |
1370 } |