Mercurial > hg > truffle
annotate src/share/vm/opto/reg_split.cpp @ 7666:31540ca73e81
Remove ControlFlowException in SimpleLanguage.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Fri, 01 Feb 2013 19:53:52 +0100 |
parents | 2aff40cb4703 |
children | 8373c19be854 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
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 | |
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77 int num_regs = RegMask::num_registers(ireg); |
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78 bool is_vect = RegMask::is_vector(ireg); |
0 | 79 if( w_mask->overlap( *o_mask ) && // Overlap AND |
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80 ((num_regs == 1) // Single use or aligned |
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81 || is_vect // or vector |
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82 || !is_vect && o_mask->is_aligned_pairs()) ) { |
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83 assert(!is_vect || o_mask->is_aligned_sets(num_regs), "vectors are aligned"); |
0 | 84 // Don't come here for mis-aligned doubles |
85 w_o_mask = w_mask; | |
86 } else { // wide ideal mask does not overlap with o_mask | |
87 // Mis-aligned doubles come here and XMM->FPR moves on x86. | |
88 w_o_mask = o_mask; // Must target desired registers | |
89 // Does the ideal-reg-mask overlap with o_mask? I.e., can I use | |
90 // a reg-reg move or do I need a trip across register classes | |
91 // (and thus through memory)? | |
92 if( !C->matcher()->idealreg2regmask[ireg]->overlap( *o_mask) && o_mask->is_UP() ) | |
93 // Here we assume a trip through memory is required. | |
94 w_i_mask = &C->FIRST_STACK_mask(); | |
95 } | |
96 return new (C) MachSpillCopyNode( def, *w_i_mask, *w_o_mask ); | |
97 } | |
98 | |
99 //------------------------------insert_proj------------------------------------ | |
605 | 100 // Insert the spill at chosen location. Skip over any intervening Proj's or |
0 | 101 // Phis. Skip over a CatchNode and projs, inserting in the fall-through block |
102 // instead. Update high-pressure indices. Create a new live range. | |
103 void PhaseChaitin::insert_proj( Block *b, uint i, Node *spill, uint maxlrg ) { | |
104 // Skip intervening ProjNodes. Do not insert between a ProjNode and | |
105 // its definer. | |
106 while( i < b->_nodes.size() && | |
107 (b->_nodes[i]->is_Proj() || | |
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108 b->_nodes[i]->is_Phi() ) ) |
0 | 109 i++; |
110 | |
111 // Do not insert between a call and his Catch | |
112 if( b->_nodes[i]->is_Catch() ) { | |
113 // Put the instruction at the top of the fall-thru block. | |
114 // Find the fall-thru projection | |
115 while( 1 ) { | |
116 const CatchProjNode *cp = b->_nodes[++i]->as_CatchProj(); | |
117 if( cp->_con == CatchProjNode::fall_through_index ) | |
118 break; | |
119 } | |
120 int sidx = i - b->end_idx()-1; | |
121 b = b->_succs[sidx]; // Switch to successor block | |
122 i = 1; // Right at start of block | |
123 } | |
124 | |
125 b->_nodes.insert(i,spill); // Insert node in block | |
126 _cfg._bbs.map(spill->_idx,b); // Update node->block mapping to reflect | |
127 // Adjust the point where we go hi-pressure | |
128 if( i <= b->_ihrp_index ) b->_ihrp_index++; | |
129 if( i <= b->_fhrp_index ) b->_fhrp_index++; | |
130 | |
131 // Assign a new Live Range Number to the SpillCopy and grow | |
132 // the node->live range mapping. | |
133 new_lrg(spill,maxlrg); | |
134 } | |
135 | |
136 //------------------------------split_DEF-------------------------------------- | |
605 | 137 // There are four categories of Split; UP/DOWN x DEF/USE |
0 | 138 // Only three of these really occur as DOWN/USE will always color |
139 // Any Split with a DEF cannot CISC-Spill now. Thus we need | |
140 // two helper routines, one for Split DEFS (insert after instruction), | |
141 // one for Split USES (insert before instruction). DEF insertion | |
142 // happens inside Split, where the Leaveblock array is updated. | |
143 uint PhaseChaitin::split_DEF( Node *def, Block *b, int loc, uint maxlrg, Node **Reachblock, Node **debug_defs, GrowableArray<uint> splits, int slidx ) { | |
144 #ifdef ASSERT | |
145 // Increment the counter for this lrg | |
146 splits.at_put(slidx, splits.at(slidx)+1); | |
147 #endif | |
148 // If we are spilling the memory op for an implicit null check, at the | |
149 // null check location (ie - null check is in HRP block) we need to do | |
150 // the null-check first, then spill-down in the following block. | |
151 // (The implicit_null_check function ensures the use is also dominated | |
152 // by the branch-not-taken block.) | |
153 Node *be = b->end(); | |
154 if( be->is_MachNullCheck() && be->in(1) == def && def == b->_nodes[loc] ) { | |
155 // Spill goes in the branch-not-taken block | |
156 b = b->_succs[b->_nodes[b->end_idx()+1]->Opcode() == Op_IfTrue]; | |
157 loc = 0; // Just past the Region | |
158 } | |
159 assert( loc >= 0, "must insert past block head" ); | |
160 | |
161 // Get a def-side SpillCopy | |
162 Node *spill = get_spillcopy_wide(def,NULL,0); | |
163 // Did we fail to split?, then bail | |
164 if (!spill) { | |
165 return 0; | |
166 } | |
167 | |
168 // Insert the spill at chosen location | |
169 insert_proj( b, loc+1, spill, maxlrg++); | |
170 | |
171 // Insert new node into Reaches array | |
172 Reachblock[slidx] = spill; | |
173 // Update debug list of reaching down definitions by adding this one | |
174 debug_defs[slidx] = spill; | |
175 | |
176 // return updated count of live ranges | |
177 return maxlrg; | |
178 } | |
179 | |
180 //------------------------------split_USE-------------------------------------- | |
181 // Splits at uses can involve redeffing the LRG, so no CISC Spilling there. | |
182 // Debug uses want to know if def is already stack enabled. | |
183 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 ) { | |
184 #ifdef ASSERT | |
185 // Increment the counter for this lrg | |
186 splits.at_put(slidx, splits.at(slidx)+1); | |
187 #endif | |
188 | |
189 // Some setup stuff for handling debug node uses | |
190 JVMState* jvms = use->jvms(); | |
191 uint debug_start = jvms ? jvms->debug_start() : 999999; | |
192 uint debug_end = jvms ? jvms->debug_end() : 999999; | |
193 | |
194 //------------------------------------------- | |
195 // Check for use of debug info | |
196 if (useidx >= debug_start && useidx < debug_end) { | |
197 // Actually it's perfectly legal for constant debug info to appear | |
198 // just unlikely. In this case the optimizer left a ConI of a 4 | |
199 // as both inputs to a Phi with only a debug use. It's a single-def | |
200 // live range of a rematerializable value. The live range spills, | |
201 // rematerializes and now the ConI directly feeds into the debug info. | |
202 // assert(!def->is_Con(), "constant debug info already constructed directly"); | |
203 | |
204 // Special split handling for Debug Info | |
205 // If DEF is DOWN, just hook the edge and return | |
206 // If DEF is UP, Split it DOWN for this USE. | |
207 if( def->is_Mach() ) { | |
208 if( def_down ) { | |
209 // DEF is DOWN, so connect USE directly to the DEF | |
210 use->set_req(useidx, def); | |
211 } else { | |
212 // Block and index where the use occurs. | |
213 Block *b = _cfg._bbs[use->_idx]; | |
214 // Put the clone just prior to use | |
215 int bindex = b->find_node(use); | |
216 // DEF is UP, so must copy it DOWN and hook in USE | |
217 // Insert SpillCopy before the USE, which uses DEF as its input, | |
218 // and defs a new live range, which is used by this node. | |
219 Node *spill = get_spillcopy_wide(def,use,useidx); | |
220 // did we fail to split? | |
221 if (!spill) { | |
222 // Bail | |
223 return 0; | |
224 } | |
225 // insert into basic block | |
226 insert_proj( b, bindex, spill, maxlrg++ ); | |
227 // Use the new split | |
228 use->set_req(useidx,spill); | |
229 } | |
230 // No further split handling needed for this use | |
231 return maxlrg; | |
232 } // End special splitting for debug info live range | |
233 } // If debug info | |
234 | |
235 // CISC-SPILLING | |
236 // Finally, check to see if USE is CISC-Spillable, and if so, | |
237 // gather_lrg_masks will add the flags bit to its mask, and | |
238 // no use side copy is needed. This frees up the live range | |
239 // register choices without causing copy coalescing, etc. | |
240 if( UseCISCSpill && cisc_sp ) { | |
241 int inp = use->cisc_operand(); | |
242 if( inp != AdlcVMDeps::Not_cisc_spillable ) | |
243 // Convert operand number to edge index number | |
244 inp = use->as_Mach()->operand_index(inp); | |
245 if( inp == (int)useidx ) { | |
246 use->set_req(useidx, def); | |
247 #ifndef PRODUCT | |
248 if( TraceCISCSpill ) { | |
249 tty->print(" set_split: "); | |
250 use->dump(); | |
251 } | |
252 #endif | |
253 return maxlrg; | |
254 } | |
255 } | |
256 | |
257 //------------------------------------------- | |
258 // Insert a Copy before the use | |
259 | |
260 // Block and index where the use occurs. | |
261 int bindex; | |
262 // Phi input spill-copys belong at the end of the prior block | |
263 if( use->is_Phi() ) { | |
264 b = _cfg._bbs[b->pred(useidx)->_idx]; | |
265 bindex = b->end_idx(); | |
266 } else { | |
267 // Put the clone just prior to use | |
268 bindex = b->find_node(use); | |
269 } | |
270 | |
271 Node *spill = get_spillcopy_wide( def, use, useidx ); | |
272 if( !spill ) return 0; // Bailed out | |
273 // Insert SpillCopy before the USE, which uses the reaching DEF as | |
274 // its input, and defs a new live range, which is used by this node. | |
275 insert_proj( b, bindex, spill, maxlrg++ ); | |
276 // Use the spill/clone | |
277 use->set_req(useidx,spill); | |
278 | |
279 // return updated live range count | |
280 return maxlrg; | |
281 } | |
282 | |
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283 //------------------------------clone_node---------------------------- |
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284 // Clone node with anti dependence check. |
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285 Node* clone_node(Node* def, Block *b, Compile* C) { |
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286 if (def->needs_anti_dependence_check()) { |
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287 #ifdef ASSERT |
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288 if (Verbose) { |
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289 tty->print_cr("RA attempts to clone node with anti_dependence:"); |
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290 def->dump(-1); tty->cr(); |
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291 tty->print_cr("into block:"); |
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292 b->dump(); |
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293 } |
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294 #endif |
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295 if (C->subsume_loads() == true && !C->failing()) { |
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296 // Retry with subsume_loads == false |
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297 // If this is the first failure, the sentinel string will "stick" |
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298 // to the Compile object, and the C2Compiler will see it and retry. |
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299 C->record_failure(C2Compiler::retry_no_subsuming_loads()); |
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300 } else { |
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301 // Bailout without retry |
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302 C->record_method_not_compilable("RA Split failed: attempt to clone node with anti_dependence"); |
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303 } |
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304 return 0; |
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305 } |
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306 return def->clone(); |
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307 } |
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308 |
0 | 309 //------------------------------split_Rematerialize---------------------------- |
310 // Clone a local copy of the def. | |
311 Node *PhaseChaitin::split_Rematerialize( Node *def, Block *b, uint insidx, uint &maxlrg, GrowableArray<uint> splits, int slidx, uint *lrg2reach, Node **Reachblock, bool walkThru ) { | |
312 // The input live ranges will be stretched to the site of the new | |
313 // instruction. They might be stretched past a def and will thus | |
314 // have the old and new values of the same live range alive at the | |
315 // same time - a definite no-no. Split out private copies of | |
316 // the inputs. | |
317 if( def->req() > 1 ) { | |
318 for( uint i = 1; i < def->req(); i++ ) { | |
319 Node *in = def->in(i); | |
320 // Check for single-def (LRG cannot redefined) | |
321 uint lidx = n2lidx(in); | |
322 if( lidx >= _maxlrg ) continue; // Value is a recent spill-copy | |
295
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323 if (lrgs(lidx).is_singledef()) continue; |
0 | 324 |
325 Block *b_def = _cfg._bbs[def->_idx]; | |
326 int idx_def = b_def->find_node(def); | |
327 Node *in_spill = get_spillcopy_wide( in, def, i ); | |
328 if( !in_spill ) return 0; // Bailed out | |
329 insert_proj(b_def,idx_def,in_spill,maxlrg++); | |
330 if( b_def == b ) | |
331 insidx++; | |
332 def->set_req(i,in_spill); | |
333 } | |
334 } | |
335 | |
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336 Node *spill = clone_node(def, b, C); |
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337 if (spill == NULL || C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { |
0 | 338 // Check when generating nodes |
339 return 0; | |
340 } | |
341 | |
342 // See if any inputs are currently being spilled, and take the | |
343 // latest copy of spilled inputs. | |
344 if( spill->req() > 1 ) { | |
345 for( uint i = 1; i < spill->req(); i++ ) { | |
346 Node *in = spill->in(i); | |
347 uint lidx = Find_id(in); | |
348 | |
349 // Walk backwards thru spill copy node intermediates | |
295
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350 if (walkThru) { |
0 | 351 while ( in->is_SpillCopy() && lidx >= _maxlrg ) { |
352 in = in->in(1); | |
353 lidx = Find_id(in); | |
354 } | |
355 | |
295
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356 if (lidx < _maxlrg && lrgs(lidx).is_multidef()) { |
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357 // walkThru found a multidef LRG, which is unsafe to use, so |
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358 // just keep the original def used in the clone. |
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359 in = spill->in(i); |
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360 lidx = Find_id(in); |
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361 } |
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362 } |
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363 |
0 | 364 if( lidx < _maxlrg && lrgs(lidx).reg() >= LRG::SPILL_REG ) { |
365 Node *rdef = Reachblock[lrg2reach[lidx]]; | |
366 if( rdef ) spill->set_req(i,rdef); | |
367 } | |
368 } | |
369 } | |
370 | |
371 | |
372 assert( spill->out_RegMask().is_UP(), "rematerialize to a reg" ); | |
373 // Rematerialized op is def->spilled+1 | |
374 set_was_spilled(spill); | |
375 if( _spilled_once.test(def->_idx) ) | |
376 set_was_spilled(spill); | |
377 | |
378 insert_proj( b, insidx, spill, maxlrg++ ); | |
379 #ifdef ASSERT | |
380 // Increment the counter for this lrg | |
381 splits.at_put(slidx, splits.at(slidx)+1); | |
382 #endif | |
383 // See if the cloned def kills any flags, and copy those kills as well | |
384 uint i = insidx+1; | |
385 if( clone_projs( b, i, def, spill, maxlrg ) ) { | |
386 // Adjust the point where we go hi-pressure | |
387 if( i <= b->_ihrp_index ) b->_ihrp_index++; | |
388 if( i <= b->_fhrp_index ) b->_fhrp_index++; | |
389 } | |
390 | |
391 return spill; | |
392 } | |
393 | |
394 //------------------------------is_high_pressure------------------------------- | |
395 // Function to compute whether or not this live range is "high pressure" | |
396 // in this block - whether it spills eagerly or not. | |
397 bool PhaseChaitin::is_high_pressure( Block *b, LRG *lrg, uint insidx ) { | |
398 if( lrg->_was_spilled1 ) return true; | |
399 // Forced spilling due to conflict? Then split only at binding uses | |
400 // or defs, not for supposed capacity problems. | |
401 // CNC - Turned off 7/8/99, causes too much spilling | |
402 // if( lrg->_is_bound ) return false; | |
403 | |
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404 // Use float pressure numbers for vectors. |
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405 bool is_float_or_vector = lrg->_is_float || lrg->_is_vector; |
0 | 406 // Not yet reached the high-pressure cutoff point, so low pressure |
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407 uint hrp_idx = is_float_or_vector ? b->_fhrp_index : b->_ihrp_index; |
0 | 408 if( insidx < hrp_idx ) return false; |
409 // Register pressure for the block as a whole depends on reg class | |
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410 int block_pres = is_float_or_vector ? b->_freg_pressure : b->_reg_pressure; |
0 | 411 // Bound live ranges will split at the binding points first; |
412 // Intermediate splits should assume the live range's register set | |
413 // got "freed up" and that num_regs will become INT_PRESSURE. | |
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414 int bound_pres = is_float_or_vector ? FLOATPRESSURE : INTPRESSURE; |
0 | 415 // Effective register pressure limit. |
416 int lrg_pres = (lrg->get_invalid_mask_size() > lrg->num_regs()) | |
417 ? (lrg->get_invalid_mask_size() >> (lrg->num_regs()-1)) : bound_pres; | |
418 // High pressure if block pressure requires more register freedom | |
419 // than live range has. | |
420 return block_pres >= lrg_pres; | |
421 } | |
422 | |
423 | |
424 //------------------------------prompt_use--------------------------------- | |
425 // True if lidx is used before any real register is def'd in the block | |
426 bool PhaseChaitin::prompt_use( Block *b, uint lidx ) { | |
427 if( lrgs(lidx)._was_spilled2 ) return false; | |
428 | |
429 // Scan block for 1st use. | |
430 for( uint i = 1; i <= b->end_idx(); i++ ) { | |
431 Node *n = b->_nodes[i]; | |
432 // Ignore PHI use, these can be up or down | |
433 if( n->is_Phi() ) continue; | |
434 for( uint j = 1; j < n->req(); j++ ) | |
435 if( Find_id(n->in(j)) == lidx ) | |
436 return true; // Found 1st use! | |
437 if( n->out_RegMask().is_NotEmpty() ) return false; | |
438 } | |
439 return false; | |
440 } | |
441 | |
442 //------------------------------Split-------------------------------------- | |
443 //----------Split Routine---------- | |
444 // ***** NEW SPLITTING HEURISTIC ***** | |
445 // DEFS: If the DEF is in a High Register Pressure(HRP) Block, split there. | |
446 // Else, no split unless there is a HRP block between a DEF and | |
447 // one of its uses, and then split at the HRP block. | |
448 // | |
449 // USES: If USE is in HRP, split at use to leave main LRG on stack. | |
450 // Else, hoist LRG back up to register only (ie - split is also DEF) | |
451 // We will compute a new maxlrg as we go | |
6632 | 452 uint PhaseChaitin::Split(uint maxlrg, ResourceArea* split_arena) { |
0 | 453 NOT_PRODUCT( Compile::TracePhase t3("regAllocSplit", &_t_regAllocSplit, TimeCompiler); ) |
454 | |
6632 | 455 // Free thread local resources used by this method on exit. |
456 ResourceMark rm(split_arena); | |
457 | |
0 | 458 uint bidx, pidx, slidx, insidx, inpidx, twoidx; |
459 uint non_phi = 1, spill_cnt = 0; | |
460 Node **Reachblock; | |
461 Node *n1, *n2, *n3; | |
462 Node_List *defs,*phis; | |
463 bool *UPblock; | |
464 bool u1, u2, u3; | |
465 Block *b, *pred; | |
466 PhiNode *phi; | |
6632 | 467 GrowableArray<uint> lidxs(split_arena, _maxlrg, 0, 0); |
0 | 468 |
469 // Array of counters to count splits per live range | |
6632 | 470 GrowableArray<uint> splits(split_arena, _maxlrg, 0, 0); |
471 | |
472 #define NEW_SPLIT_ARRAY(type, size)\ | |
473 (type*) split_arena->allocate_bytes((size) * sizeof(type)) | |
0 | 474 |
475 //----------Setup Code---------- | |
476 // Create a convenient mapping from lrg numbers to reaches/leaves indices | |
6632 | 477 uint *lrg2reach = NEW_SPLIT_ARRAY( uint, _maxlrg ); |
0 | 478 // Keep track of DEFS & Phis for later passes |
479 defs = new Node_List(); | |
480 phis = new Node_List(); | |
481 // Gather info on which LRG's are spilling, and build maps | |
482 for( bidx = 1; bidx < _maxlrg; bidx++ ) { | |
483 if( lrgs(bidx).alive() && lrgs(bidx).reg() >= LRG::SPILL_REG ) { | |
484 assert(!lrgs(bidx).mask().is_AllStack(),"AllStack should color"); | |
485 lrg2reach[bidx] = spill_cnt; | |
486 spill_cnt++; | |
487 lidxs.append(bidx); | |
488 #ifdef ASSERT | |
489 // Initialize the split counts to zero | |
490 splits.append(0); | |
491 #endif | |
492 #ifndef PRODUCT | |
493 if( PrintOpto && WizardMode && lrgs(bidx)._was_spilled1 ) | |
494 tty->print_cr("Warning, 2nd spill of L%d",bidx); | |
495 #endif | |
496 } | |
497 } | |
498 | |
499 // Create side arrays for propagating reaching defs info. | |
500 // Each block needs a node pointer for each spilling live range for the | |
501 // Def which is live into the block. Phi nodes handle multiple input | |
502 // Defs by querying the output of their predecessor blocks and resolving | |
503 // them to a single Def at the phi. The pointer is updated for each | |
504 // Def in the block, and then becomes the output for the block when | |
505 // processing of the block is complete. We also need to track whether | |
506 // a Def is UP or DOWN. UP means that it should get a register (ie - | |
507 // it is always in LRP regions), and DOWN means that it is probably | |
508 // on the stack (ie - it crosses HRP regions). | |
6632 | 509 Node ***Reaches = NEW_SPLIT_ARRAY( Node**, _cfg._num_blocks+1 ); |
510 bool **UP = NEW_SPLIT_ARRAY( bool*, _cfg._num_blocks+1 ); | |
511 Node **debug_defs = NEW_SPLIT_ARRAY( Node*, spill_cnt ); | |
512 VectorSet **UP_entry= NEW_SPLIT_ARRAY( VectorSet*, spill_cnt ); | |
0 | 513 |
514 // Initialize Reaches & UP | |
515 for( bidx = 0; bidx < _cfg._num_blocks+1; bidx++ ) { | |
6632 | 516 Reaches[bidx] = NEW_SPLIT_ARRAY( Node*, spill_cnt ); |
517 UP[bidx] = NEW_SPLIT_ARRAY( bool, spill_cnt ); | |
0 | 518 Node **Reachblock = Reaches[bidx]; |
519 bool *UPblock = UP[bidx]; | |
520 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
521 UPblock[slidx] = true; // Assume they start in registers | |
522 Reachblock[slidx] = NULL; // Assume that no def is present | |
523 } | |
524 } | |
525 | |
6632 | 526 #undef NEW_SPLIT_ARRAY |
527 | |
0 | 528 // Initialize to array of empty vectorsets |
529 for( slidx = 0; slidx < spill_cnt; slidx++ ) | |
6632 | 530 UP_entry[slidx] = new VectorSet(split_arena); |
0 | 531 |
532 //----------PASS 1---------- | |
533 //----------Propagation & Node Insertion Code---------- | |
534 // Walk the Blocks in RPO for DEF & USE info | |
535 for( bidx = 0; bidx < _cfg._num_blocks; bidx++ ) { | |
536 | |
537 if (C->check_node_count(spill_cnt, out_of_nodes)) { | |
538 return 0; | |
539 } | |
540 | |
541 b = _cfg._blocks[bidx]; | |
542 // Reaches & UP arrays for this block | |
543 Reachblock = Reaches[b->_pre_order]; | |
544 UPblock = UP[b->_pre_order]; | |
545 // Reset counter of start of non-Phi nodes in block | |
546 non_phi = 1; | |
547 //----------Block Entry Handling---------- | |
548 // Check for need to insert a new phi | |
549 // Cycle through this block's predecessors, collecting Reaches | |
550 // info for each spilled LRG. If they are identical, no phi is | |
551 // needed. If they differ, check for a phi, and insert if missing, | |
552 // or update edges if present. Set current block's Reaches set to | |
553 // be either the phi's or the reaching def, as appropriate. | |
554 // If no Phi is needed, check if the LRG needs to spill on entry | |
555 // to the block due to HRP. | |
556 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
557 // Grab the live range number | |
558 uint lidx = lidxs.at(slidx); | |
559 // Do not bother splitting or putting in Phis for single-def | |
560 // rematerialized live ranges. This happens alot to constants | |
561 // with long live ranges. | |
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562 if( lrgs(lidx).is_singledef() && |
0 | 563 lrgs(lidx)._def->rematerialize() ) { |
564 // reset the Reaches & UP entries | |
565 Reachblock[slidx] = lrgs(lidx)._def; | |
566 UPblock[slidx] = true; | |
567 // Record following instruction in case 'n' rematerializes and | |
568 // kills flags | |
569 Block *pred1 = _cfg._bbs[b->pred(1)->_idx]; | |
570 continue; | |
571 } | |
572 | |
573 // Initialize needs_phi and needs_split | |
574 bool needs_phi = false; | |
575 bool needs_split = false; | |
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576 bool has_phi = false; |
0 | 577 // Walk the predecessor blocks to check inputs for that live range |
578 // Grab predecessor block header | |
579 n1 = b->pred(1); | |
580 // Grab the appropriate reaching def info for inpidx | |
581 pred = _cfg._bbs[n1->_idx]; | |
582 pidx = pred->_pre_order; | |
583 Node **Ltmp = Reaches[pidx]; | |
584 bool *Utmp = UP[pidx]; | |
585 n1 = Ltmp[slidx]; | |
586 u1 = Utmp[slidx]; | |
587 // Initialize node for saving type info | |
588 n3 = n1; | |
589 u3 = u1; | |
590 | |
591 // Compare inputs to see if a Phi is needed | |
592 for( inpidx = 2; inpidx < b->num_preds(); inpidx++ ) { | |
593 // Grab predecessor block headers | |
594 n2 = b->pred(inpidx); | |
595 // Grab the appropriate reaching def info for inpidx | |
596 pred = _cfg._bbs[n2->_idx]; | |
597 pidx = pred->_pre_order; | |
598 Ltmp = Reaches[pidx]; | |
599 Utmp = UP[pidx]; | |
600 n2 = Ltmp[slidx]; | |
601 u2 = Utmp[slidx]; | |
602 // For each LRG, decide if a phi is necessary | |
603 if( n1 != n2 ) { | |
604 needs_phi = true; | |
605 } | |
606 // See if the phi has mismatched inputs, UP vs. DOWN | |
607 if( n1 && n2 && (u1 != u2) ) { | |
608 needs_split = true; | |
609 } | |
610 // Move n2/u2 to n1/u1 for next iteration | |
611 n1 = n2; | |
612 u1 = u2; | |
613 // Preserve a non-NULL predecessor for later type referencing | |
614 if( (n3 == NULL) && (n2 != NULL) ){ | |
615 n3 = n2; | |
616 u3 = u2; | |
617 } | |
618 } // End for all potential Phi inputs | |
619 | |
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620 // check block for appropriate phinode & update edges |
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621 for( insidx = 1; insidx <= b->end_idx(); insidx++ ) { |
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622 n1 = b->_nodes[insidx]; |
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623 // bail if this is not a phi |
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624 phi = n1->is_Phi() ? n1->as_Phi() : NULL; |
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625 if( phi == NULL ) { |
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626 // Keep track of index of first non-PhiNode instruction in block |
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627 non_phi = insidx; |
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628 // break out of the for loop as we have handled all phi nodes |
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629 break; |
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630 } |
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631 // must be looking at a phi |
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632 if( Find_id(n1) == lidxs.at(slidx) ) { |
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633 // found the necessary phi |
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634 needs_phi = false; |
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635 has_phi = true; |
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636 // initialize the Reaches entry for this LRG |
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637 Reachblock[slidx] = phi; |
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638 break; |
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639 } // end if found correct phi |
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640 } // end for all phi's |
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641 |
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642 // If a phi is needed or exist, check for it |
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643 if( needs_phi || has_phi ) { |
0 | 644 // add new phinode if one not already found |
645 if( needs_phi ) { | |
646 // create a new phi node and insert it into the block | |
647 // type is taken from left over pointer to a predecessor | |
648 assert(n3,"No non-NULL reaching DEF for a Phi"); | |
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649 phi = new (C) PhiNode(b->head(), n3->bottom_type()); |
0 | 650 // initialize the Reaches entry for this LRG |
651 Reachblock[slidx] = phi; | |
652 | |
653 // add node to block & node_to_block mapping | |
654 insert_proj( b, insidx++, phi, maxlrg++ ); | |
655 non_phi++; | |
656 // Reset new phi's mapping to be the spilling live range | |
657 _names.map(phi->_idx, lidx); | |
658 assert(Find_id(phi) == lidx,"Bad update on Union-Find mapping"); | |
659 } // end if not found correct phi | |
660 // Here you have either found or created the Phi, so record it | |
661 assert(phi != NULL,"Must have a Phi Node here"); | |
662 phis->push(phi); | |
663 // PhiNodes should either force the LRG UP or DOWN depending | |
664 // on its inputs and the register pressure in the Phi's block. | |
665 UPblock[slidx] = true; // Assume new DEF is UP | |
666 // If entering a high-pressure area with no immediate use, | |
667 // assume Phi is DOWN | |
668 if( is_high_pressure( b, &lrgs(lidx), b->end_idx()) && !prompt_use(b,lidx) ) | |
669 UPblock[slidx] = false; | |
670 // If we are not split up/down and all inputs are down, then we | |
671 // are down | |
672 if( !needs_split && !u3 ) | |
673 UPblock[slidx] = false; | |
674 } // end if phi is needed | |
675 | |
676 // Do not need a phi, so grab the reaching DEF | |
677 else { | |
678 // Grab predecessor block header | |
679 n1 = b->pred(1); | |
680 // Grab the appropriate reaching def info for k | |
681 pred = _cfg._bbs[n1->_idx]; | |
682 pidx = pred->_pre_order; | |
683 Node **Ltmp = Reaches[pidx]; | |
684 bool *Utmp = UP[pidx]; | |
685 // reset the Reaches & UP entries | |
686 Reachblock[slidx] = Ltmp[slidx]; | |
687 UPblock[slidx] = Utmp[slidx]; | |
688 } // end else no Phi is needed | |
689 } // end for all spilling live ranges | |
690 // DEBUG | |
691 #ifndef PRODUCT | |
692 if(trace_spilling()) { | |
693 tty->print("/`\nBlock %d: ", b->_pre_order); | |
694 tty->print("Reaching Definitions after Phi handling\n"); | |
695 for( uint x = 0; x < spill_cnt; x++ ) { | |
696 tty->print("Spill Idx %d: UP %d: Node\n",x,UPblock[x]); | |
697 if( Reachblock[x] ) | |
698 Reachblock[x]->dump(); | |
699 else | |
700 tty->print("Undefined\n"); | |
701 } | |
702 } | |
703 #endif | |
704 | |
705 //----------Non-Phi Node Splitting---------- | |
706 // Since phi-nodes have now been handled, the Reachblock array for this | |
707 // block is initialized with the correct starting value for the defs which | |
708 // reach non-phi instructions in this block. Thus, process non-phi | |
709 // instructions normally, inserting SpillCopy nodes for all spill | |
710 // locations. | |
711 | |
712 // Memoize any DOWN reaching definitions for use as DEBUG info | |
713 for( insidx = 0; insidx < spill_cnt; insidx++ ) { | |
714 debug_defs[insidx] = (UPblock[insidx]) ? NULL : Reachblock[insidx]; | |
715 if( UPblock[insidx] ) // Memoize UP decision at block start | |
716 UP_entry[insidx]->set( b->_pre_order ); | |
717 } | |
718 | |
719 //----------Walk Instructions in the Block and Split---------- | |
720 // For all non-phi instructions in the block | |
721 for( insidx = 1; insidx <= b->end_idx(); insidx++ ) { | |
722 Node *n = b->_nodes[insidx]; | |
723 // Find the defining Node's live range index | |
724 uint defidx = Find_id(n); | |
725 uint cnt = n->req(); | |
726 | |
727 if( n->is_Phi() ) { | |
728 // Skip phi nodes after removing dead copies. | |
729 if( defidx < _maxlrg ) { | |
730 // Check for useless Phis. These appear if we spill, then | |
731 // coalesce away copies. Dont touch Phis in spilling live | |
732 // ranges; they are busy getting modifed in this pass. | |
733 if( lrgs(defidx).reg() < LRG::SPILL_REG ) { | |
734 uint i; | |
735 Node *u = NULL; | |
736 // Look for the Phi merging 2 unique inputs | |
737 for( i = 1; i < cnt; i++ ) { | |
738 // Ignore repeats and self | |
739 if( n->in(i) != u && n->in(i) != n ) { | |
740 // Found a unique input | |
741 if( u != NULL ) // If it's the 2nd, bail out | |
742 break; | |
743 u = n->in(i); // Else record it | |
744 } | |
745 } | |
746 assert( u, "at least 1 valid input expected" ); | |
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747 if( i >= cnt ) { // Found one unique input |
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748 assert(Find_id(n) == Find_id(u), "should be the same lrg"); |
0 | 749 n->replace_by(u); // Then replace with unique input |
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750 n->disconnect_inputs(NULL, C); |
0 | 751 b->_nodes.remove(insidx); |
752 insidx--; | |
753 b->_ihrp_index--; | |
754 b->_fhrp_index--; | |
755 } | |
756 } | |
757 } | |
758 continue; | |
759 } | |
760 assert( insidx > b->_ihrp_index || | |
761 (b->_reg_pressure < (uint)INTPRESSURE) || | |
762 b->_ihrp_index > 4000000 || | |
763 b->_ihrp_index >= b->end_idx() || | |
764 !b->_nodes[b->_ihrp_index]->is_Proj(), "" ); | |
765 assert( insidx > b->_fhrp_index || | |
766 (b->_freg_pressure < (uint)FLOATPRESSURE) || | |
767 b->_fhrp_index > 4000000 || | |
768 b->_fhrp_index >= b->end_idx() || | |
769 !b->_nodes[b->_fhrp_index]->is_Proj(), "" ); | |
770 | |
771 // ********** Handle Crossing HRP Boundry ********** | |
772 if( (insidx == b->_ihrp_index) || (insidx == b->_fhrp_index) ) { | |
773 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
605 | 774 // Check for need to split at HRP boundary - split if UP |
0 | 775 n1 = Reachblock[slidx]; |
776 // bail out if no reaching DEF | |
777 if( n1 == NULL ) continue; | |
778 // bail out if live range is 'isolated' around inner loop | |
779 uint lidx = lidxs.at(slidx); | |
780 // If live range is currently UP | |
781 if( UPblock[slidx] ) { | |
782 // set location to insert spills at | |
783 // SPLIT DOWN HERE - NO CISC SPILL | |
784 if( is_high_pressure( b, &lrgs(lidx), insidx ) && | |
785 !n1->rematerialize() ) { | |
786 // If there is already a valid stack definition available, use it | |
787 if( debug_defs[slidx] != NULL ) { | |
788 Reachblock[slidx] = debug_defs[slidx]; | |
789 } | |
790 else { | |
791 // Insert point is just past last use or def in the block | |
792 int insert_point = insidx-1; | |
793 while( insert_point > 0 ) { | |
794 Node *n = b->_nodes[insert_point]; | |
795 // Hit top of block? Quit going backwards | |
796 if( n->is_Phi() ) break; | |
797 // Found a def? Better split after it. | |
798 if( n2lidx(n) == lidx ) break; | |
799 // Look for a use | |
800 uint i; | |
801 for( i = 1; i < n->req(); i++ ) | |
802 if( n2lidx(n->in(i)) == lidx ) | |
803 break; | |
804 // Found a use? Better split after it. | |
805 if( i < n->req() ) break; | |
806 insert_point--; | |
807 } | |
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808 uint orig_eidx = b->end_idx(); |
0 | 809 maxlrg = split_DEF( n1, b, insert_point, maxlrg, Reachblock, debug_defs, splits, slidx); |
810 // If it wasn't split bail | |
811 if (!maxlrg) { | |
812 return 0; | |
813 } | |
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814 // Spill of NULL check mem op goes into the following block. |
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815 if (b->end_idx() > orig_eidx) |
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816 insidx++; |
0 | 817 } |
818 // This is a new DEF, so update UP | |
819 UPblock[slidx] = false; | |
820 #ifndef PRODUCT | |
821 // DEBUG | |
822 if( trace_spilling() ) { | |
823 tty->print("\nNew Split DOWN DEF of Spill Idx "); | |
824 tty->print("%d, UP %d:\n",slidx,false); | |
825 n1->dump(); | |
826 } | |
827 #endif | |
828 } | |
829 } // end if LRG is UP | |
830 } // end for all spilling live ranges | |
831 assert( b->_nodes[insidx] == n, "got insidx set incorrectly" ); | |
832 } // end if crossing HRP Boundry | |
833 | |
834 // If the LRG index is oob, then this is a new spillcopy, skip it. | |
835 if( defidx >= _maxlrg ) { | |
836 continue; | |
837 } | |
838 LRG &deflrg = lrgs(defidx); | |
839 uint copyidx = n->is_Copy(); | |
840 // Remove coalesced copy from CFG | |
841 if( copyidx && defidx == n2lidx(n->in(copyidx)) ) { | |
842 n->replace_by( n->in(copyidx) ); | |
843 n->set_req( copyidx, NULL ); | |
844 b->_nodes.remove(insidx--); | |
845 b->_ihrp_index--; // Adjust the point where we go hi-pressure | |
846 b->_fhrp_index--; | |
847 continue; | |
848 } | |
849 | |
850 #define DERIVED 0 | |
851 | |
852 // ********** Handle USES ********** | |
853 bool nullcheck = false; | |
854 // Implicit null checks never use the spilled value | |
855 if( n->is_MachNullCheck() ) | |
856 nullcheck = true; | |
857 if( !nullcheck ) { | |
858 // Search all inputs for a Spill-USE | |
859 JVMState* jvms = n->jvms(); | |
860 uint oopoff = jvms ? jvms->oopoff() : cnt; | |
861 uint old_last = cnt - 1; | |
862 for( inpidx = 1; inpidx < cnt; inpidx++ ) { | |
863 // Derived/base pairs may be added to our inputs during this loop. | |
864 // If inpidx > old_last, then one of these new inputs is being | |
865 // handled. Skip the derived part of the pair, but process | |
866 // the base like any other input. | |
867 if( inpidx > old_last && ((inpidx - oopoff) & 1) == DERIVED ) { | |
868 continue; // skip derived_debug added below | |
869 } | |
870 // Get lidx of input | |
871 uint useidx = Find_id(n->in(inpidx)); | |
872 // Not a brand-new split, and it is a spill use | |
873 if( useidx < _maxlrg && lrgs(useidx).reg() >= LRG::SPILL_REG ) { | |
874 // Check for valid reaching DEF | |
875 slidx = lrg2reach[useidx]; | |
876 Node *def = Reachblock[slidx]; | |
877 assert( def != NULL, "Using Undefined Value in Split()\n"); | |
878 | |
879 // (+++) %%%% remove this in favor of pre-pass in matcher.cpp | |
880 // monitor references do not care where they live, so just hook | |
881 if ( jvms && jvms->is_monitor_use(inpidx) ) { | |
882 // The effect of this clone is to drop the node out of the block, | |
883 // so that the allocator does not see it anymore, and therefore | |
884 // does not attempt to assign it a register. | |
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885 def = clone_node(def, b, C); |
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886 if (def == NULL || C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { |
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887 return 0; |
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888 } |
0 | 889 _names.extend(def->_idx,0); |
890 _cfg._bbs.map(def->_idx,b); | |
891 n->set_req(inpidx, def); | |
892 continue; | |
893 } | |
894 | |
895 // Rematerializable? Then clone def at use site instead | |
896 // of store/load | |
897 if( def->rematerialize() ) { | |
898 int old_size = b->_nodes.size(); | |
899 def = split_Rematerialize( def, b, insidx, maxlrg, splits, slidx, lrg2reach, Reachblock, true ); | |
900 if( !def ) return 0; // Bail out | |
901 insidx += b->_nodes.size()-old_size; | |
902 } | |
903 | |
904 MachNode *mach = n->is_Mach() ? n->as_Mach() : NULL; | |
905 // Base pointers and oopmap references do not care where they live. | |
906 if ((inpidx >= oopoff) || | |
907 (mach && mach->ideal_Opcode() == Op_AddP && inpidx == AddPNode::Base)) { | |
908 if (def->rematerialize() && lrgs(useidx)._was_spilled2) { | |
909 // This def has been rematerialized a couple of times without | |
910 // progress. It doesn't care if it lives UP or DOWN, so | |
911 // spill it down now. | |
912 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false,splits,slidx); | |
913 // If it wasn't split bail | |
914 if (!maxlrg) { | |
915 return 0; | |
916 } | |
917 insidx++; // Reset iterator to skip USE side split | |
918 } else { | |
919 // Just hook the def edge | |
920 n->set_req(inpidx, def); | |
921 } | |
922 | |
923 if (inpidx >= oopoff) { | |
924 // After oopoff, we have derived/base pairs. We must mention all | |
925 // derived pointers here as derived/base pairs for GC. If the | |
926 // derived value is spilling and we have a copy both in Reachblock | |
927 // (called here 'def') and debug_defs[slidx] we need to mention | |
928 // both in derived/base pairs or kill one. | |
929 Node *derived_debug = debug_defs[slidx]; | |
930 if( ((inpidx - oopoff) & 1) == DERIVED && // derived vs base? | |
931 mach && mach->ideal_Opcode() != Op_Halt && | |
932 derived_debug != NULL && | |
933 derived_debug != def ) { // Actual 2nd value appears | |
934 // We have already set 'def' as a derived value. | |
935 // Also set debug_defs[slidx] as a derived value. | |
936 uint k; | |
937 for( k = oopoff; k < cnt; k += 2 ) | |
938 if( n->in(k) == derived_debug ) | |
939 break; // Found an instance of debug derived | |
940 if( k == cnt ) {// No instance of debug_defs[slidx] | |
941 // Add a derived/base pair to cover the debug info. | |
942 // We have to process the added base later since it is not | |
943 // handled yet at this point but skip derived part. | |
944 assert(((n->req() - oopoff) & 1) == DERIVED, | |
945 "must match skip condition above"); | |
946 n->add_req( derived_debug ); // this will be skipped above | |
947 n->add_req( n->in(inpidx+1) ); // this will be processed | |
948 // Increment cnt to handle added input edges on | |
949 // subsequent iterations. | |
950 cnt += 2; | |
951 } | |
952 } | |
953 } | |
954 continue; | |
955 } | |
956 // Special logic for DEBUG info | |
957 if( jvms && b->_freq > BLOCK_FREQUENCY(0.5) ) { | |
958 uint debug_start = jvms->debug_start(); | |
959 // If this is debug info use & there is a reaching DOWN def | |
960 if ((debug_start <= inpidx) && (debug_defs[slidx] != NULL)) { | |
961 assert(inpidx < oopoff, "handle only debug info here"); | |
962 // Just hook it in & move on | |
963 n->set_req(inpidx, debug_defs[slidx]); | |
964 // (Note that this can make two sides of a split live at the | |
965 // same time: The debug def on stack, and another def in a | |
966 // register. The GC needs to know about both of them, but any | |
967 // derived pointers after oopoff will refer to only one of the | |
968 // two defs and the GC would therefore miss the other. Thus | |
969 // this hack is only allowed for debug info which is Java state | |
970 // and therefore never a derived pointer.) | |
971 continue; | |
972 } | |
973 } | |
974 // Grab register mask info | |
975 const RegMask &dmask = def->out_RegMask(); | |
976 const RegMask &umask = n->in_RegMask(inpidx); | |
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977 bool is_vect = RegMask::is_vector(def->ideal_reg()); |
0 | 978 assert(inpidx < oopoff, "cannot use-split oop map info"); |
979 | |
980 bool dup = UPblock[slidx]; | |
981 bool uup = umask.is_UP(); | |
982 | |
983 // Need special logic to handle bound USES. Insert a split at this | |
984 // bound use if we can't rematerialize the def, or if we need the | |
985 // split to form a misaligned pair. | |
986 if( !umask.is_AllStack() && | |
987 (int)umask.Size() <= lrgs(useidx).num_regs() && | |
988 (!def->rematerialize() || | |
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989 !is_vect && umask.is_misaligned_pair())) { |
0 | 990 // These need a Split regardless of overlap or pressure |
991 // SPLIT - NO DEF - NO CISC SPILL | |
992 maxlrg = split_USE(def,b,n,inpidx,maxlrg,dup,false, splits,slidx); | |
993 // If it wasn't split bail | |
994 if (!maxlrg) { | |
995 return 0; | |
996 } | |
997 insidx++; // Reset iterator to skip USE side split | |
998 continue; | |
999 } | |
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1000 |
3842 | 1001 if (UseFPUForSpilling && n->is_MachCall() && !uup && !dup ) { |
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1002 // The use at the call can force the def down so insert |
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1003 // a split before the use to allow the def more freedom. |
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1004 maxlrg = split_USE(def,b,n,inpidx,maxlrg,dup,false, splits,slidx); |
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1005 // If it wasn't split bail |
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1006 if (!maxlrg) { |
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1007 return 0; |
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1008 } |
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1009 insidx++; // Reset iterator to skip USE side split |
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1010 continue; |
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1011 } |
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1012 |
0 | 1013 // Here is the logic chart which describes USE Splitting: |
1014 // 0 = false or DOWN, 1 = true or UP | |
1015 // | |
1016 // Overlap | DEF | USE | Action | |
1017 //------------------------------------------------------- | |
1018 // 0 | 0 | 0 | Copy - mem -> mem | |
1019 // 0 | 0 | 1 | Split-UP - Check HRP | |
1020 // 0 | 1 | 0 | Split-DOWN - Debug Info? | |
1021 // 0 | 1 | 1 | Copy - reg -> reg | |
1022 // 1 | 0 | 0 | Reset Input Edge (no Split) | |
1023 // 1 | 0 | 1 | Split-UP - Check HRP | |
1024 // 1 | 1 | 0 | Split-DOWN - Debug Info? | |
1025 // 1 | 1 | 1 | Reset Input Edge (no Split) | |
1026 // | |
1027 // So, if (dup == uup), then overlap test determines action, | |
1028 // with true being no split, and false being copy. Else, | |
1029 // if DEF is DOWN, Split-UP, and check HRP to decide on | |
1030 // resetting DEF. Finally if DEF is UP, Split-DOWN, with | |
1031 // special handling for Debug Info. | |
1032 if( dup == uup ) { | |
1033 if( dmask.overlap(umask) ) { | |
1034 // Both are either up or down, and there is overlap, No Split | |
1035 n->set_req(inpidx, def); | |
1036 } | |
1037 else { // Both are either up or down, and there is no overlap | |
1038 if( dup ) { // If UP, reg->reg copy | |
1039 // COPY ACROSS HERE - NO DEF - NO CISC SPILL | |
1040 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1041 // If it wasn't split bail | |
1042 if (!maxlrg) { | |
1043 return 0; | |
1044 } | |
1045 insidx++; // Reset iterator to skip USE side split | |
1046 } | |
1047 else { // DOWN, mem->mem copy | |
1048 // COPY UP & DOWN HERE - NO DEF - NO CISC SPILL | |
1049 // First Split-UP to move value into Register | |
1050 uint def_ideal = def->ideal_reg(); | |
1051 const RegMask* tmp_rm = Matcher::idealreg2regmask[def_ideal]; | |
1052 Node *spill = new (C) MachSpillCopyNode(def, dmask, *tmp_rm); | |
1053 insert_proj( b, insidx, spill, maxlrg ); | |
1054 // Then Split-DOWN as if previous Split was DEF | |
1055 maxlrg = split_USE(spill,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1056 // If it wasn't split bail | |
1057 if (!maxlrg) { | |
1058 return 0; | |
1059 } | |
1060 insidx += 2; // Reset iterator to skip USE side splits | |
1061 } | |
1062 } // End else no overlap | |
1063 } // End if dup == uup | |
1064 // dup != uup, so check dup for direction of Split | |
1065 else { | |
1066 if( dup ) { // If UP, Split-DOWN and check Debug Info | |
1067 // If this node is already a SpillCopy, just patch the edge | |
1068 // except the case of spilling to stack. | |
1069 if( n->is_SpillCopy() ) { | |
1070 RegMask tmp_rm(umask); | |
1071 tmp_rm.SUBTRACT(Matcher::STACK_ONLY_mask); | |
1072 if( dmask.overlap(tmp_rm) ) { | |
1073 if( def != n->in(inpidx) ) { | |
1074 n->set_req(inpidx, def); | |
1075 } | |
1076 continue; | |
1077 } | |
1078 } | |
1079 // COPY DOWN HERE - NO DEF - NO CISC SPILL | |
1080 maxlrg = split_USE(def,b,n,inpidx,maxlrg,false,false, splits,slidx); | |
1081 // If it wasn't split bail | |
1082 if (!maxlrg) { | |
1083 return 0; | |
1084 } | |
1085 insidx++; // Reset iterator to skip USE side split | |
1086 // Check for debug-info split. Capture it for later | |
1087 // debug splits of the same value | |
1088 if (jvms && jvms->debug_start() <= inpidx && inpidx < oopoff) | |
1089 debug_defs[slidx] = n->in(inpidx); | |
1090 | |
1091 } | |
1092 else { // DOWN, Split-UP and check register pressure | |
1093 if( is_high_pressure( b, &lrgs(useidx), insidx ) ) { | |
1094 // COPY UP HERE - NO DEF - CISC SPILL | |
1095 maxlrg = split_USE(def,b,n,inpidx,maxlrg,true,true, splits,slidx); | |
1096 // If it wasn't split bail | |
1097 if (!maxlrg) { | |
1098 return 0; | |
1099 } | |
1100 insidx++; // Reset iterator to skip USE side split | |
1101 } else { // LRP | |
1102 // COPY UP HERE - WITH DEF - NO CISC SPILL | |
1103 maxlrg = split_USE(def,b,n,inpidx,maxlrg,true,false, splits,slidx); | |
1104 // If it wasn't split bail | |
1105 if (!maxlrg) { | |
1106 return 0; | |
1107 } | |
1108 // Flag this lift-up in a low-pressure block as | |
1109 // already-spilled, so if it spills again it will | |
1110 // spill hard (instead of not spilling hard and | |
1111 // coalescing away). | |
1112 set_was_spilled(n->in(inpidx)); | |
1113 // Since this is a new DEF, update Reachblock & UP | |
1114 Reachblock[slidx] = n->in(inpidx); | |
1115 UPblock[slidx] = true; | |
1116 insidx++; // Reset iterator to skip USE side split | |
1117 } | |
1118 } // End else DOWN | |
1119 } // End dup != uup | |
1120 } // End if Spill USE | |
1121 } // End For All Inputs | |
1122 } // End If not nullcheck | |
1123 | |
1124 // ********** Handle DEFS ********** | |
1125 // DEFS either Split DOWN in HRP regions or when the LRG is bound, or | |
1126 // just reset the Reaches info in LRP regions. DEFS must always update | |
1127 // UP info. | |
1128 if( deflrg.reg() >= LRG::SPILL_REG ) { // Spilled? | |
1129 uint slidx = lrg2reach[defidx]; | |
1130 // Add to defs list for later assignment of new live range number | |
1131 defs->push(n); | |
1132 // Set a flag on the Node indicating it has already spilled. | |
1133 // Only do it for capacity spills not conflict spills. | |
1134 if( !deflrg._direct_conflict ) | |
1135 set_was_spilled(n); | |
1136 assert(!n->is_Phi(),"Cannot insert Phi into DEFS list"); | |
1137 // Grab UP info for DEF | |
1138 const RegMask &dmask = n->out_RegMask(); | |
1139 bool defup = dmask.is_UP(); | |
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1140 int ireg = n->ideal_reg(); |
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1141 bool is_vect = RegMask::is_vector(ireg); |
0 | 1142 // Only split at Def if this is a HRP block or bound (and spilled once) |
1143 if( !n->rematerialize() && | |
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1144 (((dmask.is_bound(ireg) || !is_vect && dmask.is_misaligned_pair()) && |
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1145 (deflrg._direct_conflict || deflrg._must_spill)) || |
0 | 1146 // Check for LRG being up in a register and we are inside a high |
1147 // pressure area. Spill it down immediately. | |
1148 (defup && is_high_pressure(b,&deflrg,insidx))) ) { | |
1149 assert( !n->rematerialize(), "" ); | |
1150 assert( !n->is_SpillCopy(), "" ); | |
1151 // Do a split at the def site. | |
1152 maxlrg = split_DEF( n, b, insidx, maxlrg, Reachblock, debug_defs, splits, slidx ); | |
1153 // If it wasn't split bail | |
1154 if (!maxlrg) { | |
1155 return 0; | |
1156 } | |
1157 // Split DEF's Down | |
1158 UPblock[slidx] = 0; | |
1159 #ifndef PRODUCT | |
1160 // DEBUG | |
1161 if( trace_spilling() ) { | |
1162 tty->print("\nNew Split DOWN DEF of Spill Idx "); | |
1163 tty->print("%d, UP %d:\n",slidx,false); | |
1164 n->dump(); | |
1165 } | |
1166 #endif | |
1167 } | |
1168 else { // Neither bound nor HRP, must be LRP | |
1169 // otherwise, just record the def | |
1170 Reachblock[slidx] = n; | |
1171 // UP should come from the outRegmask() of the DEF | |
1172 UPblock[slidx] = defup; | |
1173 // Update debug list of reaching down definitions, kill if DEF is UP | |
1174 debug_defs[slidx] = defup ? NULL : n; | |
1175 #ifndef PRODUCT | |
1176 // DEBUG | |
1177 if( trace_spilling() ) { | |
1178 tty->print("\nNew DEF of Spill Idx "); | |
1179 tty->print("%d, UP %d:\n",slidx,defup); | |
1180 n->dump(); | |
1181 } | |
1182 #endif | |
1183 } // End else LRP | |
1184 } // End if spill def | |
1185 | |
1186 // ********** Split Left Over Mem-Mem Moves ********** | |
1187 // Check for mem-mem copies and split them now. Do not do this | |
1188 // to copies about to be spilled; they will be Split shortly. | |
1189 if( copyidx ) { | |
1190 Node *use = n->in(copyidx); | |
1191 uint useidx = Find_id(use); | |
1192 if( useidx < _maxlrg && // This is not a new split | |
1193 OptoReg::is_stack(deflrg.reg()) && | |
1194 deflrg.reg() < LRG::SPILL_REG ) { // And DEF is from stack | |
1195 LRG &uselrg = lrgs(useidx); | |
1196 if( OptoReg::is_stack(uselrg.reg()) && | |
1197 uselrg.reg() < LRG::SPILL_REG && // USE is from stack | |
1198 deflrg.reg() != uselrg.reg() ) { // Not trivially removed | |
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1199 uint def_ideal_reg = n->bottom_type()->ideal_reg(); |
0 | 1200 const RegMask &def_rm = *Matcher::idealreg2regmask[def_ideal_reg]; |
1201 const RegMask &use_rm = n->in_RegMask(copyidx); | |
1202 if( def_rm.overlap(use_rm) && n->is_SpillCopy() ) { // Bug 4707800, 'n' may be a storeSSL | |
1203 if (C->check_node_count(NodeLimitFudgeFactor, out_of_nodes)) { // Check when generating nodes | |
1204 return 0; | |
1205 } | |
1206 Node *spill = new (C) MachSpillCopyNode(use,use_rm,def_rm); | |
1207 n->set_req(copyidx,spill); | |
1208 n->as_MachSpillCopy()->set_in_RegMask(def_rm); | |
1209 // Put the spill just before the copy | |
1210 insert_proj( b, insidx++, spill, maxlrg++ ); | |
1211 } | |
1212 } | |
1213 } | |
1214 } | |
1215 } // End For All Instructions in Block - Non-PHI Pass | |
1216 | |
1217 // Check if each LRG is live out of this block so as not to propagate | |
1218 // beyond the last use of a LRG. | |
1219 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
1220 uint defidx = lidxs.at(slidx); | |
1221 IndexSet *liveout = _live->live(b); | |
1222 if( !liveout->member(defidx) ) { | |
1223 #ifdef ASSERT | |
1224 // The index defidx is not live. Check the liveout array to ensure that | |
1225 // it contains no members which compress to defidx. Finding such an | |
1226 // instance may be a case to add liveout adjustment in compress_uf_map(). | |
1227 // See 5063219. | |
1228 uint member; | |
1229 IndexSetIterator isi(liveout); | |
1230 while ((member = isi.next()) != 0) { | |
1231 assert(defidx != Find_const(member), "Live out member has not been compressed"); | |
1232 } | |
1233 #endif | |
1234 Reachblock[slidx] = NULL; | |
1235 } else { | |
1236 assert(Reachblock[slidx] != NULL,"No reaching definition for liveout value"); | |
1237 } | |
1238 } | |
1239 #ifndef PRODUCT | |
1240 if( trace_spilling() ) | |
1241 b->dump(); | |
1242 #endif | |
1243 } // End For All Blocks | |
1244 | |
1245 //----------PASS 2---------- | |
1246 // Reset all DEF live range numbers here | |
1247 for( insidx = 0; insidx < defs->size(); insidx++ ) { | |
1248 // Grab the def | |
1249 n1 = defs->at(insidx); | |
1250 // Set new lidx for DEF | |
1251 new_lrg(n1, maxlrg++); | |
1252 } | |
1253 //----------Phi Node Splitting---------- | |
1254 // Clean up a phi here, and assign a new live range number | |
1255 // Cycle through this block's predecessors, collecting Reaches | |
1256 // info for each spilled LRG and update edges. | |
1257 // Walk the phis list to patch inputs, split phis, and name phis | |
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1258 uint lrgs_before_phi_split = maxlrg; |
0 | 1259 for( insidx = 0; insidx < phis->size(); insidx++ ) { |
1260 Node *phi = phis->at(insidx); | |
1261 assert(phi->is_Phi(),"This list must only contain Phi Nodes"); | |
1262 Block *b = _cfg._bbs[phi->_idx]; | |
1263 // Grab the live range number | |
1264 uint lidx = Find_id(phi); | |
1265 uint slidx = lrg2reach[lidx]; | |
1266 // Update node to lidx map | |
1267 new_lrg(phi, maxlrg++); | |
1268 // Get PASS1's up/down decision for the block. | |
1269 int phi_up = !!UP_entry[slidx]->test(b->_pre_order); | |
1270 | |
1271 // Force down if double-spilling live range | |
1272 if( lrgs(lidx)._was_spilled1 ) | |
1273 phi_up = false; | |
1274 | |
1275 // When splitting a Phi we an split it normal or "inverted". | |
1276 // An inverted split makes the splits target the Phi's UP/DOWN | |
1277 // sense inverted; then the Phi is followed by a final def-side | |
1278 // split to invert back. It changes which blocks the spill code | |
1279 // goes in. | |
1280 | |
1281 // Walk the predecessor blocks and assign the reaching def to the Phi. | |
1282 // Split Phi nodes by placing USE side splits wherever the reaching | |
1283 // DEF has the wrong UP/DOWN value. | |
1284 for( uint i = 1; i < b->num_preds(); i++ ) { | |
1285 // Get predecessor block pre-order number | |
1286 Block *pred = _cfg._bbs[b->pred(i)->_idx]; | |
1287 pidx = pred->_pre_order; | |
1288 // Grab reaching def | |
1289 Node *def = Reaches[pidx][slidx]; | |
1290 assert( def, "must have reaching def" ); | |
1291 // If input up/down sense and reg-pressure DISagree | |
1292 if( def->rematerialize() ) { | |
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1293 // Place the rematerialized node above any MSCs created during |
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1294 // phi node splitting. end_idx points at the insertion point |
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1295 // so look at the node before it. |
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1296 int insert = pred->end_idx(); |
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1297 while (insert >= 1 && |
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1298 pred->_nodes[insert - 1]->is_SpillCopy() && |
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1299 Find(pred->_nodes[insert - 1]) >= lrgs_before_phi_split) { |
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1300 insert--; |
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1301 } |
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1302 def = split_Rematerialize( def, pred, insert, maxlrg, splits, slidx, lrg2reach, Reachblock, false ); |
0 | 1303 if( !def ) return 0; // Bail out |
1304 } | |
1305 // Update the Phi's input edge array | |
1306 phi->set_req(i,def); | |
1307 // Grab the UP/DOWN sense for the input | |
1308 u1 = UP[pidx][slidx]; | |
1309 if( u1 != (phi_up != 0)) { | |
1310 maxlrg = split_USE(def, b, phi, i, maxlrg, !u1, false, splits,slidx); | |
1311 // If it wasn't split bail | |
1312 if (!maxlrg) { | |
1313 return 0; | |
1314 } | |
1315 } | |
1316 } // End for all inputs to the Phi | |
1317 } // End for all Phi Nodes | |
1318 // Update _maxlrg to save Union asserts | |
1319 _maxlrg = maxlrg; | |
1320 | |
1321 | |
1322 //----------PASS 3---------- | |
1323 // Pass over all Phi's to union the live ranges | |
1324 for( insidx = 0; insidx < phis->size(); insidx++ ) { | |
1325 Node *phi = phis->at(insidx); | |
1326 assert(phi->is_Phi(),"This list must only contain Phi Nodes"); | |
1327 // Walk all inputs to Phi and Union input live range with Phi live range | |
1328 for( uint i = 1; i < phi->req(); i++ ) { | |
1329 // Grab the input node | |
1330 Node *n = phi->in(i); | |
1331 assert( n, "" ); | |
1332 uint lidx = Find(n); | |
1333 uint pidx = Find(phi); | |
1334 if( lidx < pidx ) | |
1335 Union(n, phi); | |
1336 else if( lidx > pidx ) | |
1337 Union(phi, n); | |
1338 } // End for all inputs to the Phi Node | |
1339 } // End for all Phi Nodes | |
1340 // Now union all two address instructions | |
1341 for( insidx = 0; insidx < defs->size(); insidx++ ) { | |
1342 // Grab the def | |
1343 n1 = defs->at(insidx); | |
1344 // Set new lidx for DEF & handle 2-addr instructions | |
1345 if( n1->is_Mach() && ((twoidx = n1->as_Mach()->two_adr()) != 0) ) { | |
1346 assert( Find(n1->in(twoidx)) < maxlrg,"Assigning bad live range index"); | |
1347 // Union the input and output live ranges | |
1348 uint lr1 = Find(n1); | |
1349 uint lr2 = Find(n1->in(twoidx)); | |
1350 if( lr1 < lr2 ) | |
1351 Union(n1, n1->in(twoidx)); | |
1352 else if( lr1 > lr2 ) | |
1353 Union(n1->in(twoidx), n1); | |
1354 } // End if two address | |
1355 } // End for all defs | |
1356 // DEBUG | |
1357 #ifdef ASSERT | |
1358 // Validate all live range index assignments | |
1359 for( bidx = 0; bidx < _cfg._num_blocks; bidx++ ) { | |
1360 b = _cfg._blocks[bidx]; | |
1361 for( insidx = 0; insidx <= b->end_idx(); insidx++ ) { | |
1362 Node *n = b->_nodes[insidx]; | |
1363 uint defidx = Find(n); | |
1364 assert(defidx < _maxlrg,"Bad live range index in Split"); | |
1365 assert(defidx < maxlrg,"Bad live range index in Split"); | |
1366 } | |
1367 } | |
1368 // Issue a warning if splitting made no progress | |
1369 int noprogress = 0; | |
1370 for( slidx = 0; slidx < spill_cnt; slidx++ ) { | |
1371 if( PrintOpto && WizardMode && splits.at(slidx) == 0 ) { | |
1372 tty->print_cr("Failed to split live range %d", lidxs.at(slidx)); | |
1373 //BREAKPOINT; | |
1374 } | |
1375 else { | |
1376 noprogress++; | |
1377 } | |
1378 } | |
1379 if(!noprogress) { | |
1380 tty->print_cr("Failed to make progress in Split"); | |
1381 //BREAKPOINT; | |
1382 } | |
1383 #endif | |
1384 // Return updated count of live ranges | |
1385 return maxlrg; | |
1386 } |