Mercurial > hg > truffle
annotate src/share/vm/opto/postaloc.cpp @ 7090:05ce1defa4f9
Common out some parts of UnsafeLoad/Store in UnsafeAccess
author | Gilles Duboscq <duboscq@ssw.jku.at> |
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date | Thu, 29 Nov 2012 13:24:08 +0100 |
parents | 424142833d10 |
children | 2aff40cb4703 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1998, 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 "memory/allocation.inline.hpp" | |
27 #include "opto/chaitin.hpp" | |
28 #include "opto/machnode.hpp" | |
0 | 29 |
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30 // See if this register (or pairs, or vector) already contains the value. |
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31 static bool register_contains_value(Node* val, OptoReg::Name reg, int n_regs, |
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32 Node_List& value) { |
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33 for (int i = 0; i < n_regs; i++) { |
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34 OptoReg::Name nreg = OptoReg::add(reg,-i); |
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35 if (value[nreg] != val) |
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36 return false; |
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37 } |
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38 return true; |
0 | 39 } |
40 | |
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41 //---------------------------may_be_copy_of_callee----------------------------- |
0 | 42 // Check to see if we can possibly be a copy of a callee-save value. |
43 bool PhaseChaitin::may_be_copy_of_callee( Node *def ) const { | |
44 // Short circuit if there are no callee save registers | |
45 if (_matcher.number_of_saved_registers() == 0) return false; | |
46 | |
47 // Expect only a spill-down and reload on exit for callee-save spills. | |
48 // Chains of copies cannot be deep. | |
49 // 5008997 - This is wishful thinking. Register allocator seems to | |
50 // be splitting live ranges for callee save registers to such | |
51 // an extent that in large methods the chains can be very long | |
52 // (50+). The conservative answer is to return true if we don't | |
605 | 53 // know as this prevents optimizations from occurring. |
0 | 54 |
55 const int limit = 60; | |
56 int i; | |
57 for( i=0; i < limit; i++ ) { | |
58 if( def->is_Proj() && def->in(0)->is_Start() && | |
59 _matcher.is_save_on_entry(lrgs(n2lidx(def)).reg()) ) | |
60 return true; // Direct use of callee-save proj | |
61 if( def->is_Copy() ) // Copies carry value through | |
62 def = def->in(def->is_Copy()); | |
63 else if( def->is_Phi() ) // Phis can merge it from any direction | |
64 def = def->in(1); | |
65 else | |
66 break; | |
67 guarantee(def != NULL, "must not resurrect dead copy"); | |
68 } | |
69 // If we reached the end and didn't find a callee save proj | |
70 // then this may be a callee save proj so we return true | |
71 // as the conservative answer. If we didn't reach then end | |
72 // we must have discovered that it was not a callee save | |
73 // else we would have returned. | |
74 return i == limit; | |
75 } | |
76 | |
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77 //------------------------------yank----------------------------------- |
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78 // Helper function for yank_if_dead |
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79 int PhaseChaitin::yank( Node *old, Block *current_block, Node_List *value, Node_List *regnd ) { |
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80 int blk_adjust=0; |
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81 Block *oldb = _cfg._bbs[old->_idx]; |
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82 oldb->find_remove(old); |
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83 // Count 1 if deleting an instruction from the current block |
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84 if( oldb == current_block ) blk_adjust++; |
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85 _cfg._bbs.map(old->_idx,NULL); |
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86 OptoReg::Name old_reg = lrgs(n2lidx(old)).reg(); |
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87 if( regnd && (*regnd)[old_reg]==old ) { // Instruction is currently available? |
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88 value->map(old_reg,NULL); // Yank from value/regnd maps |
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89 regnd->map(old_reg,NULL); // This register's value is now unknown |
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90 } |
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91 return blk_adjust; |
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92 } |
0 | 93 |
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94 #ifdef ASSERT |
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95 static bool expected_yanked_node(Node *old, Node *orig_old) { |
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96 // This code is expected only next original nodes: |
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97 // - load from constant table node which may have next data input nodes: |
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98 // MachConstantBase, Phi, MachTemp, MachSpillCopy |
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99 // - load constant node which may have next data input nodes: |
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100 // MachTemp, MachSpillCopy |
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101 // - MachSpillCopy |
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102 // - MachProj and Copy dead nodes |
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103 if (old->is_MachSpillCopy()) { |
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104 return true; |
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105 } else if (old->is_Con()) { |
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106 return true; |
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107 } else if (old->is_MachProj()) { // Dead kills projection of Con node |
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108 return (old == orig_old); |
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109 } else if (old->is_Copy()) { // Dead copy of a callee-save value |
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110 return (old == orig_old); |
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111 } else if (old->is_MachTemp()) { |
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112 return orig_old->is_Con(); |
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113 } else if (old->is_Phi() || old->is_MachConstantBase()) { |
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114 return (orig_old->is_Con() && orig_old->is_MachConstant()); |
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115 } |
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116 return false; |
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117 } |
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118 #endif |
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119 |
0 | 120 //------------------------------yank_if_dead----------------------------------- |
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121 // Removed edges from 'old'. Yank if dead. Return adjustment counts to |
0 | 122 // iterators in the current block. |
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123 int PhaseChaitin::yank_if_dead_recurse(Node *old, Node *orig_old, Block *current_block, |
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124 Node_List *value, Node_List *regnd) { |
0 | 125 int blk_adjust=0; |
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126 if (old->outcnt() == 0 && old != C->top()) { |
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127 #ifdef ASSERT |
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128 if (!expected_yanked_node(old, orig_old)) { |
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129 tty->print_cr("=============================================="); |
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130 tty->print_cr("orig_old:"); |
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131 orig_old->dump(); |
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132 tty->print_cr("old:"); |
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133 old->dump(); |
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134 assert(false, "unexpected yanked node"); |
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135 } |
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136 if (old->is_Con()) |
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137 orig_old = old; // Reset to satisfy expected nodes checks. |
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138 #endif |
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139 blk_adjust += yank(old, current_block, value, regnd); |
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140 |
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141 for (uint i = 1; i < old->req(); i++) { |
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142 Node* n = old->in(i); |
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143 if (n != NULL) { |
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144 old->set_req(i, NULL); |
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145 blk_adjust += yank_if_dead_recurse(n, orig_old, current_block, value, regnd); |
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146 } |
0 | 147 } |
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148 // Disconnect control and remove precedence edges if any exist |
0 | 149 old->disconnect_inputs(NULL); |
150 } | |
151 return blk_adjust; | |
152 } | |
153 | |
154 //------------------------------use_prior_register----------------------------- | |
155 // Use the prior value instead of the current value, in an effort to make | |
156 // the current value go dead. Return block iterator adjustment, in case | |
157 // we yank some instructions from this block. | |
158 int PhaseChaitin::use_prior_register( Node *n, uint idx, Node *def, Block *current_block, Node_List &value, Node_List ®nd ) { | |
159 // No effect? | |
160 if( def == n->in(idx) ) return 0; | |
161 // Def is currently dead and can be removed? Do not resurrect | |
162 if( def->outcnt() == 0 ) return 0; | |
163 | |
164 // Not every pair of physical registers are assignment compatible, | |
165 // e.g. on sparc floating point registers are not assignable to integer | |
166 // registers. | |
167 const LRG &def_lrg = lrgs(n2lidx(def)); | |
168 OptoReg::Name def_reg = def_lrg.reg(); | |
169 const RegMask &use_mask = n->in_RegMask(idx); | |
170 bool can_use = ( RegMask::can_represent(def_reg) ? (use_mask.Member(def_reg) != 0) | |
171 : (use_mask.is_AllStack() != 0)); | |
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172 if (!RegMask::is_vector(def->ideal_reg())) { |
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173 // Check for a copy to or from a misaligned pair. |
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174 // It is workaround for a sparc with misaligned pairs. |
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175 can_use = can_use && !use_mask.is_misaligned_pair() && !def_lrg.mask().is_misaligned_pair(); |
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176 } |
0 | 177 if (!can_use) |
178 return 0; | |
179 | |
180 // Capture the old def in case it goes dead... | |
181 Node *old = n->in(idx); | |
182 | |
183 // Save-on-call copies can only be elided if the entire copy chain can go | |
184 // away, lest we get the same callee-save value alive in 2 locations at | |
185 // once. We check for the obvious trivial case here. Although it can | |
186 // sometimes be elided with cooperation outside our scope, here we will just | |
187 // miss the opportunity. :-( | |
188 if( may_be_copy_of_callee(def) ) { | |
189 if( old->outcnt() > 1 ) return 0; // We're the not last user | |
190 int idx = old->is_Copy(); | |
191 assert( idx, "chain of copies being removed" ); | |
192 Node *old2 = old->in(idx); // Chain of copies | |
193 if( old2->outcnt() > 1 ) return 0; // old is not the last user | |
194 int idx2 = old2->is_Copy(); | |
195 if( !idx2 ) return 0; // Not a chain of 2 copies | |
196 if( def != old2->in(idx2) ) return 0; // Chain of exactly 2 copies | |
197 } | |
198 | |
199 // Use the new def | |
200 n->set_req(idx,def); | |
201 _post_alloc++; | |
202 | |
203 // Is old def now dead? We successfully yanked a copy? | |
204 return yank_if_dead(old,current_block,&value,®nd); | |
205 } | |
206 | |
207 | |
208 //------------------------------skip_copies------------------------------------ | |
209 // Skip through any number of copies (that don't mod oop-i-ness) | |
210 Node *PhaseChaitin::skip_copies( Node *c ) { | |
211 int idx = c->is_Copy(); | |
212 uint is_oop = lrgs(n2lidx(c))._is_oop; | |
213 while (idx != 0) { | |
214 guarantee(c->in(idx) != NULL, "must not resurrect dead copy"); | |
215 if (lrgs(n2lidx(c->in(idx)))._is_oop != is_oop) | |
216 break; // casting copy, not the same value | |
217 c = c->in(idx); | |
218 idx = c->is_Copy(); | |
219 } | |
220 return c; | |
221 } | |
222 | |
223 //------------------------------elide_copy------------------------------------- | |
224 // Remove (bypass) copies along Node n, edge k. | |
225 int PhaseChaitin::elide_copy( Node *n, int k, Block *current_block, Node_List &value, Node_List ®nd, bool can_change_regs ) { | |
226 int blk_adjust = 0; | |
227 | |
228 uint nk_idx = n2lidx(n->in(k)); | |
229 OptoReg::Name nk_reg = lrgs(nk_idx ).reg(); | |
230 | |
231 // Remove obvious same-register copies | |
232 Node *x = n->in(k); | |
233 int idx; | |
234 while( (idx=x->is_Copy()) != 0 ) { | |
235 Node *copy = x->in(idx); | |
236 guarantee(copy != NULL, "must not resurrect dead copy"); | |
237 if( lrgs(n2lidx(copy)).reg() != nk_reg ) break; | |
238 blk_adjust += use_prior_register(n,k,copy,current_block,value,regnd); | |
239 if( n->in(k) != copy ) break; // Failed for some cutout? | |
240 x = copy; // Progress, try again | |
241 } | |
242 | |
243 // Phis and 2-address instructions cannot change registers so easily - their | |
244 // outputs must match their input. | |
245 if( !can_change_regs ) | |
246 return blk_adjust; // Only check stupid copies! | |
247 | |
248 // Loop backedges won't have a value-mapping yet | |
249 if( &value == NULL ) return blk_adjust; | |
250 | |
251 // Skip through all copies to the _value_ being used. Do not change from | |
252 // int to pointer. This attempts to jump through a chain of copies, where | |
253 // intermediate copies might be illegal, i.e., value is stored down to stack | |
254 // then reloaded BUT survives in a register the whole way. | |
255 Node *val = skip_copies(n->in(k)); | |
256 | |
2008 | 257 if (val == x && nk_idx != 0 && |
258 regnd[nk_reg] != NULL && regnd[nk_reg] != x && | |
259 n2lidx(x) == n2lidx(regnd[nk_reg])) { | |
260 // When rematerialzing nodes and stretching lifetimes, the | |
261 // allocator will reuse the original def for multidef LRG instead | |
262 // of the current reaching def because it can't know it's safe to | |
263 // do so. After allocation completes if they are in the same LRG | |
264 // then it should use the current reaching def instead. | |
265 n->set_req(k, regnd[nk_reg]); | |
266 blk_adjust += yank_if_dead(val, current_block, &value, ®nd); | |
267 val = skip_copies(n->in(k)); | |
268 } | |
269 | |
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270 if (val == x) return blk_adjust; // No progress? |
0 | 271 |
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272 int n_regs = RegMask::num_registers(val->ideal_reg()); |
0 | 273 uint val_idx = n2lidx(val); |
274 OptoReg::Name val_reg = lrgs(val_idx).reg(); | |
275 | |
276 // See if it happens to already be in the correct register! | |
277 // (either Phi's direct register, or the common case of the name | |
278 // never-clobbered original-def register) | |
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279 if (register_contains_value(val, val_reg, n_regs, value)) { |
0 | 280 blk_adjust += use_prior_register(n,k,regnd[val_reg],current_block,value,regnd); |
281 if( n->in(k) == regnd[val_reg] ) // Success! Quit trying | |
282 return blk_adjust; | |
283 } | |
284 | |
285 // See if we can skip the copy by changing registers. Don't change from | |
286 // using a register to using the stack unless we know we can remove a | |
287 // copy-load. Otherwise we might end up making a pile of Intel cisc-spill | |
288 // ops reading from memory instead of just loading once and using the | |
289 // register. | |
290 | |
291 // Also handle duplicate copies here. | |
292 const Type *t = val->is_Con() ? val->bottom_type() : NULL; | |
293 | |
294 // Scan all registers to see if this value is around already | |
295 for( uint reg = 0; reg < (uint)_max_reg; reg++ ) { | |
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296 if (reg == (uint)nk_reg) { |
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297 // Found ourselves so check if there is only one user of this |
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298 // copy and keep on searching for a better copy if so. |
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299 bool ignore_self = true; |
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300 x = n->in(k); |
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301 DUIterator_Fast imax, i = x->fast_outs(imax); |
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302 Node* first = x->fast_out(i); i++; |
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303 while (i < imax && ignore_self) { |
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304 Node* use = x->fast_out(i); i++; |
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305 if (use != first) ignore_self = false; |
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306 } |
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307 if (ignore_self) continue; |
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308 } |
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309 |
0 | 310 Node *vv = value[reg]; |
6185 | 311 if (n_regs > 1) { // Doubles and vectors check for aligned-adjacent set |
312 uint last = (n_regs-1); // Looking for the last part of a set | |
313 if ((reg&last) != last) continue; // Wrong part of a set | |
314 if (!register_contains_value(vv, reg, n_regs, value)) continue; // Different value | |
0 | 315 } |
316 if( vv == val || // Got a direct hit? | |
317 (t && vv && vv->bottom_type() == t && vv->is_Mach() && | |
318 vv->as_Mach()->rule() == val->as_Mach()->rule()) ) { // Or same constant? | |
319 assert( !n->is_Phi(), "cannot change registers at a Phi so easily" ); | |
320 if( OptoReg::is_stack(nk_reg) || // CISC-loading from stack OR | |
321 OptoReg::is_reg(reg) || // turning into a register use OR | |
322 regnd[reg]->outcnt()==1 ) { // last use of a spill-load turns into a CISC use | |
323 blk_adjust += use_prior_register(n,k,regnd[reg],current_block,value,regnd); | |
324 if( n->in(k) == regnd[reg] ) // Success! Quit trying | |
325 return blk_adjust; | |
326 } // End of if not degrading to a stack | |
327 } // End of if found value in another register | |
328 } // End of scan all machine registers | |
329 return blk_adjust; | |
330 } | |
331 | |
332 | |
333 // | |
334 // Check if nreg already contains the constant value val. Normal copy | |
335 // elimination doesn't doesn't work on constants because multiple | |
336 // nodes can represent the same constant so the type and rule of the | |
337 // MachNode must be checked to ensure equivalence. | |
338 // | |
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339 bool PhaseChaitin::eliminate_copy_of_constant(Node* val, Node* n, |
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340 Block *current_block, |
0 | 341 Node_List& value, Node_List& regnd, |
342 OptoReg::Name nreg, OptoReg::Name nreg2) { | |
343 if (value[nreg] != val && val->is_Con() && | |
344 value[nreg] != NULL && value[nreg]->is_Con() && | |
345 (nreg2 == OptoReg::Bad || value[nreg] == value[nreg2]) && | |
346 value[nreg]->bottom_type() == val->bottom_type() && | |
347 value[nreg]->as_Mach()->rule() == val->as_Mach()->rule()) { | |
348 // This code assumes that two MachNodes representing constants | |
349 // which have the same rule and the same bottom type will produce | |
350 // identical effects into a register. This seems like it must be | |
351 // objectively true unless there are hidden inputs to the nodes | |
352 // but if that were to change this code would need to updated. | |
353 // Since they are equivalent the second one if redundant and can | |
354 // be removed. | |
355 // | |
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356 // n will be replaced with the old value but n might have |
0 | 357 // kills projections associated with it so remove them now so that |
605 | 358 // yank_if_dead will be able to eliminate the copy once the uses |
0 | 359 // have been transferred to the old[value]. |
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360 for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) { |
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361 Node* use = n->fast_out(i); |
0 | 362 if (use->is_Proj() && use->outcnt() == 0) { |
363 // Kill projections have no users and one input | |
364 use->set_req(0, C->top()); | |
365 yank_if_dead(use, current_block, &value, ®nd); | |
366 --i; --imax; | |
367 } | |
368 } | |
369 _post_alloc++; | |
370 return true; | |
371 } | |
372 return false; | |
373 } | |
374 | |
375 | |
376 //------------------------------post_allocate_copy_removal--------------------- | |
377 // Post-Allocation peephole copy removal. We do this in 1 pass over the | |
378 // basic blocks. We maintain a mapping of registers to Nodes (an array of | |
379 // Nodes indexed by machine register or stack slot number). NULL means that a | |
380 // register is not mapped to any Node. We can (want to have!) have several | |
381 // registers map to the same Node. We walk forward over the instructions | |
382 // updating the mapping as we go. At merge points we force a NULL if we have | |
383 // to merge 2 different Nodes into the same register. Phi functions will give | |
384 // us a new Node if there is a proper value merging. Since the blocks are | |
385 // arranged in some RPO, we will visit all parent blocks before visiting any | |
386 // successor blocks (except at loops). | |
387 // | |
388 // If we find a Copy we look to see if the Copy's source register is a stack | |
389 // slot and that value has already been loaded into some machine register; if | |
390 // so we use machine register directly. This turns a Load into a reg-reg | |
391 // Move. We also look for reloads of identical constants. | |
392 // | |
393 // When we see a use from a reg-reg Copy, we will attempt to use the copy's | |
394 // source directly and make the copy go dead. | |
395 void PhaseChaitin::post_allocate_copy_removal() { | |
396 NOT_PRODUCT( Compile::TracePhase t3("postAllocCopyRemoval", &_t_postAllocCopyRemoval, TimeCompiler); ) | |
397 ResourceMark rm; | |
398 | |
399 // Need a mapping from basic block Node_Lists. We need a Node_List to | |
400 // map from register number to value-producing Node. | |
401 Node_List **blk2value = NEW_RESOURCE_ARRAY( Node_List *, _cfg._num_blocks+1); | |
402 memset( blk2value, 0, sizeof(Node_List*)*(_cfg._num_blocks+1) ); | |
403 // Need a mapping from basic block Node_Lists. We need a Node_List to | |
404 // map from register number to register-defining Node. | |
405 Node_List **blk2regnd = NEW_RESOURCE_ARRAY( Node_List *, _cfg._num_blocks+1); | |
406 memset( blk2regnd, 0, sizeof(Node_List*)*(_cfg._num_blocks+1) ); | |
407 | |
408 // We keep unused Node_Lists on a free_list to avoid wasting | |
409 // memory. | |
410 GrowableArray<Node_List*> free_list = GrowableArray<Node_List*>(16); | |
411 | |
412 // For all blocks | |
413 for( uint i = 0; i < _cfg._num_blocks; i++ ) { | |
414 uint j; | |
415 Block *b = _cfg._blocks[i]; | |
416 | |
417 // Count of Phis in block | |
418 uint phi_dex; | |
419 for( phi_dex = 1; phi_dex < b->_nodes.size(); phi_dex++ ) { | |
420 Node *phi = b->_nodes[phi_dex]; | |
421 if( !phi->is_Phi() ) | |
422 break; | |
423 } | |
424 | |
425 // If any predecessor has not been visited, we do not know the state | |
426 // of registers at the start. Check for this, while updating copies | |
427 // along Phi input edges | |
428 bool missing_some_inputs = false; | |
429 Block *freed = NULL; | |
430 for( j = 1; j < b->num_preds(); j++ ) { | |
431 Block *pb = _cfg._bbs[b->pred(j)->_idx]; | |
432 // Remove copies along phi edges | |
433 for( uint k=1; k<phi_dex; k++ ) | |
434 elide_copy( b->_nodes[k], j, b, *blk2value[pb->_pre_order], *blk2regnd[pb->_pre_order], false ); | |
435 if( blk2value[pb->_pre_order] ) { // Have a mapping on this edge? | |
436 // See if this predecessor's mappings have been used by everybody | |
437 // who wants them. If so, free 'em. | |
438 uint k; | |
439 for( k=0; k<pb->_num_succs; k++ ) { | |
440 Block *pbsucc = pb->_succs[k]; | |
441 if( !blk2value[pbsucc->_pre_order] && pbsucc != b ) | |
442 break; // Found a future user | |
443 } | |
444 if( k >= pb->_num_succs ) { // No more uses, free! | |
445 freed = pb; // Record last block freed | |
446 free_list.push(blk2value[pb->_pre_order]); | |
447 free_list.push(blk2regnd[pb->_pre_order]); | |
448 } | |
449 } else { // This block has unvisited (loopback) inputs | |
450 missing_some_inputs = true; | |
451 } | |
452 } | |
453 | |
454 | |
455 // Extract Node_List mappings. If 'freed' is non-zero, we just popped | |
456 // 'freed's blocks off the list | |
457 Node_List ®nd = *(free_list.is_empty() ? new Node_List() : free_list.pop()); | |
458 Node_List &value = *(free_list.is_empty() ? new Node_List() : free_list.pop()); | |
459 assert( !freed || blk2value[freed->_pre_order] == &value, "" ); | |
460 value.map(_max_reg,NULL); | |
461 regnd.map(_max_reg,NULL); | |
462 // Set mappings as OUR mappings | |
463 blk2value[b->_pre_order] = &value; | |
464 blk2regnd[b->_pre_order] = ®nd; | |
465 | |
466 // Initialize value & regnd for this block | |
467 if( missing_some_inputs ) { | |
468 // Some predecessor has not yet been visited; zap map to empty | |
469 for( uint k = 0; k < (uint)_max_reg; k++ ) { | |
470 value.map(k,NULL); | |
471 regnd.map(k,NULL); | |
472 } | |
473 } else { | |
474 if( !freed ) { // Didn't get a freebie prior block | |
475 // Must clone some data | |
476 freed = _cfg._bbs[b->pred(1)->_idx]; | |
477 Node_List &f_value = *blk2value[freed->_pre_order]; | |
478 Node_List &f_regnd = *blk2regnd[freed->_pre_order]; | |
479 for( uint k = 0; k < (uint)_max_reg; k++ ) { | |
480 value.map(k,f_value[k]); | |
481 regnd.map(k,f_regnd[k]); | |
482 } | |
483 } | |
484 // Merge all inputs together, setting to NULL any conflicts. | |
485 for( j = 1; j < b->num_preds(); j++ ) { | |
486 Block *pb = _cfg._bbs[b->pred(j)->_idx]; | |
487 if( pb == freed ) continue; // Did self already via freelist | |
488 Node_List &p_regnd = *blk2regnd[pb->_pre_order]; | |
489 for( uint k = 0; k < (uint)_max_reg; k++ ) { | |
490 if( regnd[k] != p_regnd[k] ) { // Conflict on reaching defs? | |
491 value.map(k,NULL); // Then no value handy | |
492 regnd.map(k,NULL); | |
493 } | |
494 } | |
495 } | |
496 } | |
497 | |
498 // For all Phi's | |
499 for( j = 1; j < phi_dex; j++ ) { | |
500 uint k; | |
501 Node *phi = b->_nodes[j]; | |
502 uint pidx = n2lidx(phi); | |
503 OptoReg::Name preg = lrgs(n2lidx(phi)).reg(); | |
504 | |
505 // Remove copies remaining on edges. Check for junk phi. | |
506 Node *u = NULL; | |
507 for( k=1; k<phi->req(); k++ ) { | |
508 Node *x = phi->in(k); | |
509 if( phi != x && u != x ) // Found a different input | |
510 u = u ? NodeSentinel : x; // Capture unique input, or NodeSentinel for 2nd input | |
511 } | |
512 if( u != NodeSentinel ) { // Junk Phi. Remove | |
513 b->_nodes.remove(j--); phi_dex--; | |
514 _cfg._bbs.map(phi->_idx,NULL); | |
515 phi->replace_by(u); | |
516 phi->disconnect_inputs(NULL); | |
517 continue; | |
518 } | |
519 // Note that if value[pidx] exists, then we merged no new values here | |
520 // and the phi is useless. This can happen even with the above phi | |
521 // removal for complex flows. I cannot keep the better known value here | |
522 // because locally the phi appears to define a new merged value. If I | |
523 // keep the better value then a copy of the phi, being unable to use the | |
524 // global flow analysis, can't "peek through" the phi to the original | |
525 // reaching value and so will act like it's defining a new value. This | |
526 // can lead to situations where some uses are from the old and some from | |
527 // the new values. Not illegal by itself but throws the over-strong | |
528 // assert in scheduling. | |
529 if( pidx ) { | |
530 value.map(preg,phi); | |
531 regnd.map(preg,phi); | |
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532 int n_regs = RegMask::num_registers(phi->ideal_reg()); |
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533 for (int l = 1; l < n_regs; l++) { |
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534 OptoReg::Name preg_lo = OptoReg::add(preg,-l); |
0 | 535 value.map(preg_lo,phi); |
536 regnd.map(preg_lo,phi); | |
537 } | |
538 } | |
539 } | |
540 | |
541 // For all remaining instructions | |
542 for( j = phi_dex; j < b->_nodes.size(); j++ ) { | |
543 Node *n = b->_nodes[j]; | |
544 | |
545 if( n->outcnt() == 0 && // Dead? | |
546 n != C->top() && // (ignore TOP, it has no du info) | |
547 !n->is_Proj() ) { // fat-proj kills | |
548 j -= yank_if_dead(n,b,&value,®nd); | |
549 continue; | |
550 } | |
551 | |
552 // Improve reaching-def info. Occasionally post-alloc's liveness gives | |
553 // up (at loop backedges, because we aren't doing a full flow pass). | |
554 // The presence of a live use essentially asserts that the use's def is | |
555 // alive and well at the use (or else the allocator fubar'd). Take | |
556 // advantage of this info to set a reaching def for the use-reg. | |
557 uint k; | |
558 for( k = 1; k < n->req(); k++ ) { | |
559 Node *def = n->in(k); // n->in(k) is a USE; def is the DEF for this USE | |
560 guarantee(def != NULL, "no disconnected nodes at this point"); | |
561 uint useidx = n2lidx(def); // useidx is the live range index for this USE | |
562 | |
563 if( useidx ) { | |
564 OptoReg::Name ureg = lrgs(useidx).reg(); | |
565 if( !value[ureg] ) { | |
566 int idx; // Skip occasional useless copy | |
567 while( (idx=def->is_Copy()) != 0 && | |
568 def->in(idx) != NULL && // NULL should not happen | |
569 ureg == lrgs(n2lidx(def->in(idx))).reg() ) | |
570 def = def->in(idx); | |
571 Node *valdef = skip_copies(def); // tighten up val through non-useless copies | |
572 value.map(ureg,valdef); // record improved reaching-def info | |
573 regnd.map(ureg, def); | |
574 // Record other half of doubles | |
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575 uint def_ideal_reg = def->ideal_reg(); |
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576 int n_regs = RegMask::num_registers(def_ideal_reg); |
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577 for (int l = 1; l < n_regs; l++) { |
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578 OptoReg::Name ureg_lo = OptoReg::add(ureg,-l); |
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579 if (!value[ureg_lo] && |
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580 (!RegMask::can_represent(ureg_lo) || |
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581 lrgs(useidx).mask().Member(ureg_lo))) { // Nearly always adjacent |
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582 value.map(ureg_lo,valdef); // record improved reaching-def info |
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583 regnd.map(ureg_lo, def); |
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584 } |
0 | 585 } |
586 } | |
587 } | |
588 } | |
589 | |
590 const uint two_adr = n->is_Mach() ? n->as_Mach()->two_adr() : 0; | |
591 | |
592 // Remove copies along input edges | |
593 for( k = 1; k < n->req(); k++ ) | |
594 j -= elide_copy( n, k, b, value, regnd, two_adr!=k ); | |
595 | |
596 // Unallocated Nodes define no registers | |
597 uint lidx = n2lidx(n); | |
598 if( !lidx ) continue; | |
599 | |
600 // Update the register defined by this instruction | |
601 OptoReg::Name nreg = lrgs(lidx).reg(); | |
602 // Skip through all copies to the _value_ being defined. | |
603 // Do not change from int to pointer | |
604 Node *val = skip_copies(n); | |
605 | |
923 | 606 // Clear out a dead definition before starting so that the |
607 // elimination code doesn't have to guard against it. The | |
608 // definition could in fact be a kill projection with a count of | |
609 // 0 which is safe but since those are uninteresting for copy | |
610 // elimination just delete them as well. | |
611 if (regnd[nreg] != NULL && regnd[nreg]->outcnt() == 0) { | |
612 regnd.map(nreg, NULL); | |
613 value.map(nreg, NULL); | |
614 } | |
615 | |
0 | 616 uint n_ideal_reg = n->ideal_reg(); |
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617 int n_regs = RegMask::num_registers(n_ideal_reg); |
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618 if (n_regs == 1) { |
0 | 619 // If Node 'n' does not change the value mapped by the register, |
620 // then 'n' is a useless copy. Do not update the register->node | |
621 // mapping so 'n' will go dead. | |
622 if( value[nreg] != val ) { | |
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623 if (eliminate_copy_of_constant(val, n, b, value, regnd, nreg, OptoReg::Bad)) { |
923 | 624 j -= replace_and_yank_if_dead(n, nreg, b, value, regnd); |
0 | 625 } else { |
626 // Update the mapping: record new Node defined by the register | |
627 regnd.map(nreg,n); | |
628 // Update mapping for defined *value*, which is the defined | |
629 // Node after skipping all copies. | |
630 value.map(nreg,val); | |
631 } | |
923 | 632 } else if( !may_be_copy_of_callee(n) ) { |
0 | 633 assert( n->is_Copy(), "" ); |
923 | 634 j -= replace_and_yank_if_dead(n, nreg, b, value, regnd); |
0 | 635 } |
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636 } else if (RegMask::is_vector(n_ideal_reg)) { |
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637 // If Node 'n' does not change the value mapped by the register, |
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638 // then 'n' is a useless copy. Do not update the register->node |
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639 // mapping so 'n' will go dead. |
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640 if (!register_contains_value(val, nreg, n_regs, value)) { |
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641 // Update the mapping: record new Node defined by the register |
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642 regnd.map(nreg,n); |
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643 // Update mapping for defined *value*, which is the defined |
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644 // Node after skipping all copies. |
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645 value.map(nreg,val); |
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646 for (int l = 1; l < n_regs; l++) { |
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647 OptoReg::Name nreg_lo = OptoReg::add(nreg,-l); |
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648 regnd.map(nreg_lo, n ); |
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649 value.map(nreg_lo,val); |
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650 } |
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651 } else if (n->is_Copy()) { |
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652 // Note: vector can't be constant and can't be copy of calee. |
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653 j -= replace_and_yank_if_dead(n, nreg, b, value, regnd); |
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654 } |
0 | 655 } else { |
656 // If the value occupies a register pair, record same info | |
657 // in both registers. | |
658 OptoReg::Name nreg_lo = OptoReg::add(nreg,-1); | |
659 if( RegMask::can_represent(nreg_lo) && // Either a spill slot, or | |
660 !lrgs(lidx).mask().Member(nreg_lo) ) { // Nearly always adjacent | |
661 // Sparc occasionally has non-adjacent pairs. | |
662 // Find the actual other value | |
663 RegMask tmp = lrgs(lidx).mask(); | |
664 tmp.Remove(nreg); | |
665 nreg_lo = tmp.find_first_elem(); | |
666 } | |
667 if( value[nreg] != val || value[nreg_lo] != val ) { | |
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668 if (eliminate_copy_of_constant(val, n, b, value, regnd, nreg, nreg_lo)) { |
923 | 669 j -= replace_and_yank_if_dead(n, nreg, b, value, regnd); |
0 | 670 } else { |
671 regnd.map(nreg , n ); | |
672 regnd.map(nreg_lo, n ); | |
673 value.map(nreg ,val); | |
674 value.map(nreg_lo,val); | |
675 } | |
923 | 676 } else if( !may_be_copy_of_callee(n) ) { |
0 | 677 assert( n->is_Copy(), "" ); |
923 | 678 j -= replace_and_yank_if_dead(n, nreg, b, value, regnd); |
0 | 679 } |
680 } | |
681 | |
682 // Fat projections kill many registers | |
683 if( n_ideal_reg == MachProjNode::fat_proj ) { | |
684 RegMask rm = n->out_RegMask(); | |
685 // wow, what an expensive iterator... | |
686 nreg = rm.find_first_elem(); | |
687 while( OptoReg::is_valid(nreg)) { | |
688 rm.Remove(nreg); | |
689 value.map(nreg,n); | |
690 regnd.map(nreg,n); | |
691 nreg = rm.find_first_elem(); | |
692 } | |
693 } | |
694 | |
695 } // End of for all instructions in the block | |
696 | |
697 } // End for all blocks | |
698 } |