Mercurial > hg > truffle
annotate src/share/vm/opto/subnode.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 | 8e47bac5643a |
children | cc32ccaaf47f |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "compiler/compileLog.hpp" | |
27 #include "memory/allocation.inline.hpp" | |
28 #include "opto/addnode.hpp" | |
29 #include "opto/callnode.hpp" | |
30 #include "opto/cfgnode.hpp" | |
31 #include "opto/connode.hpp" | |
32 #include "opto/loopnode.hpp" | |
33 #include "opto/matcher.hpp" | |
34 #include "opto/mulnode.hpp" | |
35 #include "opto/opcodes.hpp" | |
36 #include "opto/phaseX.hpp" | |
37 #include "opto/subnode.hpp" | |
38 #include "runtime/sharedRuntime.hpp" | |
39 | |
0 | 40 // Portions of code courtesy of Clifford Click |
41 | |
42 // Optimization - Graph Style | |
43 | |
44 #include "math.h" | |
45 | |
46 //============================================================================= | |
47 //------------------------------Identity--------------------------------------- | |
48 // If right input is a constant 0, return the left input. | |
49 Node *SubNode::Identity( PhaseTransform *phase ) { | |
50 assert(in(1) != this, "Must already have called Value"); | |
51 assert(in(2) != this, "Must already have called Value"); | |
52 | |
53 // Remove double negation | |
54 const Type *zero = add_id(); | |
55 if( phase->type( in(1) )->higher_equal( zero ) && | |
56 in(2)->Opcode() == Opcode() && | |
57 phase->type( in(2)->in(1) )->higher_equal( zero ) ) { | |
58 return in(2)->in(2); | |
59 } | |
60 | |
212 | 61 // Convert "(X+Y) - Y" into X and "(X+Y) - X" into Y |
0 | 62 if( in(1)->Opcode() == Op_AddI ) { |
63 if( phase->eqv(in(1)->in(2),in(2)) ) | |
64 return in(1)->in(1); | |
212 | 65 if (phase->eqv(in(1)->in(1),in(2))) |
66 return in(1)->in(2); | |
67 | |
0 | 68 // Also catch: "(X + Opaque2(Y)) - Y". In this case, 'Y' is a loop-varying |
69 // trip counter and X is likely to be loop-invariant (that's how O2 Nodes | |
70 // are originally used, although the optimizer sometimes jiggers things). | |
71 // This folding through an O2 removes a loop-exit use of a loop-varying | |
72 // value and generally lowers register pressure in and around the loop. | |
73 if( in(1)->in(2)->Opcode() == Op_Opaque2 && | |
74 phase->eqv(in(1)->in(2)->in(1),in(2)) ) | |
75 return in(1)->in(1); | |
76 } | |
77 | |
78 return ( phase->type( in(2) )->higher_equal( zero ) ) ? in(1) : this; | |
79 } | |
80 | |
81 //------------------------------Value------------------------------------------ | |
82 // A subtract node differences it's two inputs. | |
83 const Type *SubNode::Value( PhaseTransform *phase ) const { | |
84 const Node* in1 = in(1); | |
85 const Node* in2 = in(2); | |
86 // Either input is TOP ==> the result is TOP | |
87 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
88 if( t1 == Type::TOP ) return Type::TOP; | |
89 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
90 if( t2 == Type::TOP ) return Type::TOP; | |
91 | |
92 // Not correct for SubFnode and AddFNode (must check for infinity) | |
93 // Equal? Subtract is zero | |
4778 | 94 if (in1->eqv_uncast(in2)) return add_id(); |
0 | 95 |
96 // Either input is BOTTOM ==> the result is the local BOTTOM | |
97 if( t1 == Type::BOTTOM || t2 == Type::BOTTOM ) | |
98 return bottom_type(); | |
99 | |
100 return sub(t1,t2); // Local flavor of type subtraction | |
101 | |
102 } | |
103 | |
104 //============================================================================= | |
105 | |
106 //------------------------------Helper function-------------------------------- | |
107 static bool ok_to_convert(Node* inc, Node* iv) { | |
108 // Do not collapse (x+c0)-y if "+" is a loop increment, because the | |
109 // "-" is loop invariant and collapsing extends the live-range of "x" | |
110 // to overlap with the "+", forcing another register to be used in | |
111 // the loop. | |
112 // This test will be clearer with '&&' (apply DeMorgan's rule) | |
113 // but I like the early cutouts that happen here. | |
114 const PhiNode *phi; | |
115 if( ( !inc->in(1)->is_Phi() || | |
116 !(phi=inc->in(1)->as_Phi()) || | |
117 phi->is_copy() || | |
118 !phi->region()->is_CountedLoop() || | |
119 inc != phi->region()->as_CountedLoop()->incr() ) | |
120 && | |
121 // Do not collapse (x+c0)-iv if "iv" is a loop induction variable, | |
122 // because "x" maybe invariant. | |
123 ( !iv->is_loop_iv() ) | |
124 ) { | |
125 return true; | |
126 } else { | |
127 return false; | |
128 } | |
129 } | |
130 //------------------------------Ideal------------------------------------------ | |
131 Node *SubINode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
132 Node *in1 = in(1); | |
133 Node *in2 = in(2); | |
134 uint op1 = in1->Opcode(); | |
135 uint op2 = in2->Opcode(); | |
136 | |
137 #ifdef ASSERT | |
138 // Check for dead loop | |
139 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
140 ( op1 == Op_AddI || op1 == Op_SubI ) && | |
141 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
142 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
143 assert(false, "dead loop in SubINode::Ideal"); | |
144 #endif | |
145 | |
146 const Type *t2 = phase->type( in2 ); | |
147 if( t2 == Type::TOP ) return NULL; | |
148 // Convert "x-c0" into "x+ -c0". | |
149 if( t2->base() == Type::Int ){ // Might be bottom or top... | |
150 const TypeInt *i = t2->is_int(); | |
151 if( i->is_con() ) | |
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152 return new (phase->C) AddINode(in1, phase->intcon(-i->get_con())); |
0 | 153 } |
154 | |
155 // Convert "(x+c0) - y" into (x-y) + c0" | |
156 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
157 // if "y" is a loop induction variable. | |
158 if( op1 == Op_AddI && ok_to_convert(in1, in2) ) { | |
159 const Type *tadd = phase->type( in1->in(2) ); | |
160 if( tadd->singleton() && tadd != Type::TOP ) { | |
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161 Node *sub2 = phase->transform( new (phase->C) SubINode( in1->in(1), in2 )); |
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162 return new (phase->C) AddINode( sub2, in1->in(2) ); |
0 | 163 } |
164 } | |
165 | |
166 | |
167 // Convert "x - (y+c0)" into "(x-y) - c0" | |
168 // Need the same check as in above optimization but reversed. | |
169 if (op2 == Op_AddI && ok_to_convert(in2, in1)) { | |
170 Node* in21 = in2->in(1); | |
171 Node* in22 = in2->in(2); | |
172 const TypeInt* tcon = phase->type(in22)->isa_int(); | |
173 if (tcon != NULL && tcon->is_con()) { | |
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174 Node* sub2 = phase->transform( new (phase->C) SubINode(in1, in21) ); |
0 | 175 Node* neg_c0 = phase->intcon(- tcon->get_con()); |
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176 return new (phase->C) AddINode(sub2, neg_c0); |
0 | 177 } |
178 } | |
179 | |
180 const Type *t1 = phase->type( in1 ); | |
181 if( t1 == Type::TOP ) return NULL; | |
182 | |
183 #ifdef ASSERT | |
184 // Check for dead loop | |
185 if( ( op2 == Op_AddI || op2 == Op_SubI ) && | |
186 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
187 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
188 assert(false, "dead loop in SubINode::Ideal"); | |
189 #endif | |
190 | |
191 // Convert "x - (x+y)" into "-y" | |
192 if( op2 == Op_AddI && | |
193 phase->eqv( in1, in2->in(1) ) ) | |
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194 return new (phase->C) SubINode( phase->intcon(0),in2->in(2)); |
0 | 195 // Convert "(x-y) - x" into "-y" |
196 if( op1 == Op_SubI && | |
197 phase->eqv( in1->in(1), in2 ) ) | |
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198 return new (phase->C) SubINode( phase->intcon(0),in1->in(2)); |
0 | 199 // Convert "x - (y+x)" into "-y" |
200 if( op2 == Op_AddI && | |
201 phase->eqv( in1, in2->in(2) ) ) | |
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202 return new (phase->C) SubINode( phase->intcon(0),in2->in(1)); |
0 | 203 |
204 // Convert "0 - (x-y)" into "y-x" | |
205 if( t1 == TypeInt::ZERO && op2 == Op_SubI ) | |
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206 return new (phase->C) SubINode( in2->in(2), in2->in(1) ); |
0 | 207 |
208 // Convert "0 - (x+con)" into "-con-x" | |
209 jint con; | |
210 if( t1 == TypeInt::ZERO && op2 == Op_AddI && | |
211 (con = in2->in(2)->find_int_con(0)) != 0 ) | |
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212 return new (phase->C) SubINode( phase->intcon(-con), in2->in(1) ); |
0 | 213 |
214 // Convert "(X+A) - (X+B)" into "A - B" | |
215 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(1) ) | |
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216 return new (phase->C) SubINode( in1->in(2), in2->in(2) ); |
0 | 217 |
218 // Convert "(A+X) - (B+X)" into "A - B" | |
219 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) ) | |
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220 return new (phase->C) SubINode( in1->in(1), in2->in(1) ); |
0 | 221 |
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222 // Convert "(A+X) - (X+B)" into "A - B" |
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223 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(1) ) |
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224 return new (phase->C) SubINode( in1->in(1), in2->in(2) ); |
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225 |
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226 // Convert "(X+A) - (B+X)" into "A - B" |
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227 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(2) ) |
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228 return new (phase->C) SubINode( in1->in(2), in2->in(1) ); |
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229 |
0 | 230 // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally |
231 // nicer to optimize than subtract. | |
232 if( op2 == Op_SubI && in2->outcnt() == 1) { | |
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233 Node *add1 = phase->transform( new (phase->C) AddINode( in1, in2->in(2) ) ); |
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234 return new (phase->C) SubINode( add1, in2->in(1) ); |
0 | 235 } |
236 | |
237 return NULL; | |
238 } | |
239 | |
240 //------------------------------sub-------------------------------------------- | |
241 // A subtract node differences it's two inputs. | |
242 const Type *SubINode::sub( const Type *t1, const Type *t2 ) const { | |
243 const TypeInt *r0 = t1->is_int(); // Handy access | |
244 const TypeInt *r1 = t2->is_int(); | |
245 int32 lo = r0->_lo - r1->_hi; | |
246 int32 hi = r0->_hi - r1->_lo; | |
247 | |
248 // We next check for 32-bit overflow. | |
249 // If that happens, we just assume all integers are possible. | |
250 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
251 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
252 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
253 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
254 return TypeInt::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
255 else // Overflow; assume all integers | |
256 return TypeInt::INT; | |
257 } | |
258 | |
259 //============================================================================= | |
260 //------------------------------Ideal------------------------------------------ | |
261 Node *SubLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
262 Node *in1 = in(1); | |
263 Node *in2 = in(2); | |
264 uint op1 = in1->Opcode(); | |
265 uint op2 = in2->Opcode(); | |
266 | |
267 #ifdef ASSERT | |
268 // Check for dead loop | |
269 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
270 ( op1 == Op_AddL || op1 == Op_SubL ) && | |
271 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
272 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
273 assert(false, "dead loop in SubLNode::Ideal"); | |
274 #endif | |
275 | |
276 if( phase->type( in2 ) == Type::TOP ) return NULL; | |
277 const TypeLong *i = phase->type( in2 )->isa_long(); | |
278 // Convert "x-c0" into "x+ -c0". | |
279 if( i && // Might be bottom or top... | |
280 i->is_con() ) | |
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281 return new (phase->C) AddLNode(in1, phase->longcon(-i->get_con())); |
0 | 282 |
283 // Convert "(x+c0) - y" into (x-y) + c0" | |
284 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
285 // if "y" is a loop induction variable. | |
286 if( op1 == Op_AddL && ok_to_convert(in1, in2) ) { | |
287 Node *in11 = in1->in(1); | |
288 const Type *tadd = phase->type( in1->in(2) ); | |
289 if( tadd->singleton() && tadd != Type::TOP ) { | |
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290 Node *sub2 = phase->transform( new (phase->C) SubLNode( in11, in2 )); |
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291 return new (phase->C) AddLNode( sub2, in1->in(2) ); |
0 | 292 } |
293 } | |
294 | |
295 // Convert "x - (y+c0)" into "(x-y) - c0" | |
296 // Need the same check as in above optimization but reversed. | |
297 if (op2 == Op_AddL && ok_to_convert(in2, in1)) { | |
298 Node* in21 = in2->in(1); | |
299 Node* in22 = in2->in(2); | |
300 const TypeLong* tcon = phase->type(in22)->isa_long(); | |
301 if (tcon != NULL && tcon->is_con()) { | |
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302 Node* sub2 = phase->transform( new (phase->C) SubLNode(in1, in21) ); |
0 | 303 Node* neg_c0 = phase->longcon(- tcon->get_con()); |
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304 return new (phase->C) AddLNode(sub2, neg_c0); |
0 | 305 } |
306 } | |
307 | |
308 const Type *t1 = phase->type( in1 ); | |
309 if( t1 == Type::TOP ) return NULL; | |
310 | |
311 #ifdef ASSERT | |
312 // Check for dead loop | |
313 if( ( op2 == Op_AddL || op2 == Op_SubL ) && | |
314 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
315 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
316 assert(false, "dead loop in SubLNode::Ideal"); | |
317 #endif | |
318 | |
319 // Convert "x - (x+y)" into "-y" | |
320 if( op2 == Op_AddL && | |
321 phase->eqv( in1, in2->in(1) ) ) | |
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322 return new (phase->C) SubLNode( phase->makecon(TypeLong::ZERO), in2->in(2)); |
0 | 323 // Convert "x - (y+x)" into "-y" |
324 if( op2 == Op_AddL && | |
325 phase->eqv( in1, in2->in(2) ) ) | |
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326 return new (phase->C) SubLNode( phase->makecon(TypeLong::ZERO),in2->in(1)); |
0 | 327 |
328 // Convert "0 - (x-y)" into "y-x" | |
329 if( phase->type( in1 ) == TypeLong::ZERO && op2 == Op_SubL ) | |
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330 return new (phase->C) SubLNode( in2->in(2), in2->in(1) ); |
0 | 331 |
332 // Convert "(X+A) - (X+B)" into "A - B" | |
333 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(1) == in2->in(1) ) | |
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334 return new (phase->C) SubLNode( in1->in(2), in2->in(2) ); |
0 | 335 |
336 // Convert "(A+X) - (B+X)" into "A - B" | |
337 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(2) == in2->in(2) ) | |
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338 return new (phase->C) SubLNode( in1->in(1), in2->in(1) ); |
0 | 339 |
340 // Convert "A-(B-C)" into (A+C)-B" | |
341 if( op2 == Op_SubL && in2->outcnt() == 1) { | |
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342 Node *add1 = phase->transform( new (phase->C) AddLNode( in1, in2->in(2) ) ); |
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343 return new (phase->C) SubLNode( add1, in2->in(1) ); |
0 | 344 } |
345 | |
346 return NULL; | |
347 } | |
348 | |
349 //------------------------------sub-------------------------------------------- | |
350 // A subtract node differences it's two inputs. | |
351 const Type *SubLNode::sub( const Type *t1, const Type *t2 ) const { | |
352 const TypeLong *r0 = t1->is_long(); // Handy access | |
353 const TypeLong *r1 = t2->is_long(); | |
354 jlong lo = r0->_lo - r1->_hi; | |
355 jlong hi = r0->_hi - r1->_lo; | |
356 | |
357 // We next check for 32-bit overflow. | |
358 // If that happens, we just assume all integers are possible. | |
359 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
360 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
361 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
362 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
363 return TypeLong::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
364 else // Overflow; assume all integers | |
365 return TypeLong::LONG; | |
366 } | |
367 | |
368 //============================================================================= | |
369 //------------------------------Value------------------------------------------ | |
370 // A subtract node differences its two inputs. | |
371 const Type *SubFPNode::Value( PhaseTransform *phase ) const { | |
372 const Node* in1 = in(1); | |
373 const Node* in2 = in(2); | |
374 // Either input is TOP ==> the result is TOP | |
375 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
376 if( t1 == Type::TOP ) return Type::TOP; | |
377 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
378 if( t2 == Type::TOP ) return Type::TOP; | |
379 | |
380 // if both operands are infinity of same sign, the result is NaN; do | |
381 // not replace with zero | |
382 if( (t1->is_finite() && t2->is_finite()) ) { | |
383 if( phase->eqv(in1, in2) ) return add_id(); | |
384 } | |
385 | |
386 // Either input is BOTTOM ==> the result is the local BOTTOM | |
387 const Type *bot = bottom_type(); | |
388 if( (t1 == bot) || (t2 == bot) || | |
389 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
390 return bot; | |
391 | |
392 return sub(t1,t2); // Local flavor of type subtraction | |
393 } | |
394 | |
395 | |
396 //============================================================================= | |
397 //------------------------------Ideal------------------------------------------ | |
398 Node *SubFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
399 const Type *t2 = phase->type( in(2) ); | |
400 // Convert "x-c0" into "x+ -c0". | |
401 if( t2->base() == Type::FloatCon ) { // Might be bottom or top... | |
402 // return new (phase->C, 3) AddFNode(in(1), phase->makecon( TypeF::make(-t2->getf()) ) ); | |
403 } | |
404 | |
405 // Not associative because of boundary conditions (infinity) | |
406 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
407 // Convert "x - (x+y)" into "-y" | |
408 if( in(2)->is_Add() && | |
409 phase->eqv(in(1),in(2)->in(1) ) ) | |
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410 return new (phase->C) SubFNode( phase->makecon(TypeF::ZERO),in(2)->in(2)); |
0 | 411 } |
412 | |
413 // Cannot replace 0.0-X with -X because a 'fsub' bytecode computes | |
414 // 0.0-0.0 as +0.0, while a 'fneg' bytecode computes -0.0. | |
415 //if( phase->type(in(1)) == TypeF::ZERO ) | |
416 //return new (phase->C, 2) NegFNode(in(2)); | |
417 | |
418 return NULL; | |
419 } | |
420 | |
421 //------------------------------sub-------------------------------------------- | |
422 // A subtract node differences its two inputs. | |
423 const Type *SubFNode::sub( const Type *t1, const Type *t2 ) const { | |
424 // no folding if one of operands is infinity or NaN, do not do constant folding | |
425 if( g_isfinite(t1->getf()) && g_isfinite(t2->getf()) ) { | |
426 return TypeF::make( t1->getf() - t2->getf() ); | |
427 } | |
428 else if( g_isnan(t1->getf()) ) { | |
429 return t1; | |
430 } | |
431 else if( g_isnan(t2->getf()) ) { | |
432 return t2; | |
433 } | |
434 else { | |
435 return Type::FLOAT; | |
436 } | |
437 } | |
438 | |
439 //============================================================================= | |
440 //------------------------------Ideal------------------------------------------ | |
441 Node *SubDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
442 const Type *t2 = phase->type( in(2) ); | |
443 // Convert "x-c0" into "x+ -c0". | |
444 if( t2->base() == Type::DoubleCon ) { // Might be bottom or top... | |
445 // return new (phase->C, 3) AddDNode(in(1), phase->makecon( TypeD::make(-t2->getd()) ) ); | |
446 } | |
447 | |
448 // Not associative because of boundary conditions (infinity) | |
449 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
450 // Convert "x - (x+y)" into "-y" | |
451 if( in(2)->is_Add() && | |
452 phase->eqv(in(1),in(2)->in(1) ) ) | |
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453 return new (phase->C) SubDNode( phase->makecon(TypeD::ZERO),in(2)->in(2)); |
0 | 454 } |
455 | |
456 // Cannot replace 0.0-X with -X because a 'dsub' bytecode computes | |
457 // 0.0-0.0 as +0.0, while a 'dneg' bytecode computes -0.0. | |
458 //if( phase->type(in(1)) == TypeD::ZERO ) | |
459 //return new (phase->C, 2) NegDNode(in(2)); | |
460 | |
461 return NULL; | |
462 } | |
463 | |
464 //------------------------------sub-------------------------------------------- | |
465 // A subtract node differences its two inputs. | |
466 const Type *SubDNode::sub( const Type *t1, const Type *t2 ) const { | |
467 // no folding if one of operands is infinity or NaN, do not do constant folding | |
468 if( g_isfinite(t1->getd()) && g_isfinite(t2->getd()) ) { | |
469 return TypeD::make( t1->getd() - t2->getd() ); | |
470 } | |
471 else if( g_isnan(t1->getd()) ) { | |
472 return t1; | |
473 } | |
474 else if( g_isnan(t2->getd()) ) { | |
475 return t2; | |
476 } | |
477 else { | |
478 return Type::DOUBLE; | |
479 } | |
480 } | |
481 | |
482 //============================================================================= | |
483 //------------------------------Idealize--------------------------------------- | |
484 // Unlike SubNodes, compare must still flatten return value to the | |
485 // range -1, 0, 1. | |
486 // And optimizations like those for (X + Y) - X fail if overflow happens. | |
487 Node *CmpNode::Identity( PhaseTransform *phase ) { | |
488 return this; | |
489 } | |
490 | |
491 //============================================================================= | |
492 //------------------------------cmp-------------------------------------------- | |
493 // Simplify a CmpI (compare 2 integers) node, based on local information. | |
494 // If both inputs are constants, compare them. | |
495 const Type *CmpINode::sub( const Type *t1, const Type *t2 ) const { | |
496 const TypeInt *r0 = t1->is_int(); // Handy access | |
497 const TypeInt *r1 = t2->is_int(); | |
498 | |
499 if( r0->_hi < r1->_lo ) // Range is always low? | |
500 return TypeInt::CC_LT; | |
501 else if( r0->_lo > r1->_hi ) // Range is always high? | |
502 return TypeInt::CC_GT; | |
503 | |
504 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
505 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
506 return TypeInt::CC_EQ; // Equal results. | |
507 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
508 return TypeInt::CC_LE; | |
509 else if( r0->_lo == r1->_hi ) // Range is never low? | |
510 return TypeInt::CC_GE; | |
511 return TypeInt::CC; // else use worst case results | |
512 } | |
513 | |
514 // Simplify a CmpU (compare 2 integers) node, based on local information. | |
515 // If both inputs are constants, compare them. | |
516 const Type *CmpUNode::sub( const Type *t1, const Type *t2 ) const { | |
517 assert(!t1->isa_ptr(), "obsolete usage of CmpU"); | |
518 | |
519 // comparing two unsigned ints | |
520 const TypeInt *r0 = t1->is_int(); // Handy access | |
521 const TypeInt *r1 = t2->is_int(); | |
522 | |
523 // Current installed version | |
524 // Compare ranges for non-overlap | |
525 juint lo0 = r0->_lo; | |
526 juint hi0 = r0->_hi; | |
527 juint lo1 = r1->_lo; | |
528 juint hi1 = r1->_hi; | |
529 | |
530 // If either one has both negative and positive values, | |
531 // it therefore contains both 0 and -1, and since [0..-1] is the | |
532 // full unsigned range, the type must act as an unsigned bottom. | |
533 bool bot0 = ((jint)(lo0 ^ hi0) < 0); | |
534 bool bot1 = ((jint)(lo1 ^ hi1) < 0); | |
535 | |
536 if (bot0 || bot1) { | |
537 // All unsigned values are LE -1 and GE 0. | |
538 if (lo0 == 0 && hi0 == 0) { | |
539 return TypeInt::CC_LE; // 0 <= bot | |
540 } else if (lo1 == 0 && hi1 == 0) { | |
541 return TypeInt::CC_GE; // bot >= 0 | |
542 } | |
543 } else { | |
544 // We can use ranges of the form [lo..hi] if signs are the same. | |
545 assert(lo0 <= hi0 && lo1 <= hi1, "unsigned ranges are valid"); | |
546 // results are reversed, '-' > '+' for unsigned compare | |
547 if (hi0 < lo1) { | |
548 return TypeInt::CC_LT; // smaller | |
549 } else if (lo0 > hi1) { | |
550 return TypeInt::CC_GT; // greater | |
551 } else if (hi0 == lo1 && lo0 == hi1) { | |
552 return TypeInt::CC_EQ; // Equal results | |
553 } else if (lo0 >= hi1) { | |
554 return TypeInt::CC_GE; | |
555 } else if (hi0 <= lo1) { | |
556 // Check for special case in Hashtable::get. (See below.) | |
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557 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check()) |
0 | 558 return TypeInt::CC_LT; |
559 return TypeInt::CC_LE; | |
560 } | |
561 } | |
562 // Check for special case in Hashtable::get - the hash index is | |
563 // mod'ed to the table size so the following range check is useless. | |
564 // Check for: (X Mod Y) CmpU Y, where the mod result and Y both have | |
565 // to be positive. | |
566 // (This is a gross hack, since the sub method never | |
567 // looks at the structure of the node in any other case.) | |
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568 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check()) |
0 | 569 return TypeInt::CC_LT; |
570 return TypeInt::CC; // else use worst case results | |
571 } | |
572 | |
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573 bool CmpUNode::is_index_range_check() const { |
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574 // Check for the "(X ModI Y) CmpU Y" shape |
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575 return (in(1)->Opcode() == Op_ModI && |
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576 in(1)->in(2)->eqv_uncast(in(2))); |
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577 } |
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578 |
0 | 579 //------------------------------Idealize--------------------------------------- |
580 Node *CmpINode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
581 if (phase->type(in(2))->higher_equal(TypeInt::ZERO)) { | |
582 switch (in(1)->Opcode()) { | |
583 case Op_CmpL3: // Collapse a CmpL3/CmpI into a CmpL | |
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584 return new (phase->C) CmpLNode(in(1)->in(1),in(1)->in(2)); |
0 | 585 case Op_CmpF3: // Collapse a CmpF3/CmpI into a CmpF |
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586 return new (phase->C) CmpFNode(in(1)->in(1),in(1)->in(2)); |
0 | 587 case Op_CmpD3: // Collapse a CmpD3/CmpI into a CmpD |
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588 return new (phase->C) CmpDNode(in(1)->in(1),in(1)->in(2)); |
0 | 589 //case Op_SubI: |
590 // If (x - y) cannot overflow, then ((x - y) <?> 0) | |
591 // can be turned into (x <?> y). | |
592 // This is handled (with more general cases) by Ideal_sub_algebra. | |
593 } | |
594 } | |
595 return NULL; // No change | |
596 } | |
597 | |
598 | |
599 //============================================================================= | |
600 // Simplify a CmpL (compare 2 longs ) node, based on local information. | |
601 // If both inputs are constants, compare them. | |
602 const Type *CmpLNode::sub( const Type *t1, const Type *t2 ) const { | |
603 const TypeLong *r0 = t1->is_long(); // Handy access | |
604 const TypeLong *r1 = t2->is_long(); | |
605 | |
606 if( r0->_hi < r1->_lo ) // Range is always low? | |
607 return TypeInt::CC_LT; | |
608 else if( r0->_lo > r1->_hi ) // Range is always high? | |
609 return TypeInt::CC_GT; | |
610 | |
611 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
612 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
613 return TypeInt::CC_EQ; // Equal results. | |
614 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
615 return TypeInt::CC_LE; | |
616 else if( r0->_lo == r1->_hi ) // Range is never low? | |
617 return TypeInt::CC_GE; | |
618 return TypeInt::CC; // else use worst case results | |
619 } | |
620 | |
621 //============================================================================= | |
622 //------------------------------sub-------------------------------------------- | |
623 // Simplify an CmpP (compare 2 pointers) node, based on local information. | |
624 // If both inputs are constants, compare them. | |
625 const Type *CmpPNode::sub( const Type *t1, const Type *t2 ) const { | |
626 const TypePtr *r0 = t1->is_ptr(); // Handy access | |
627 const TypePtr *r1 = t2->is_ptr(); | |
628 | |
629 // Undefined inputs makes for an undefined result | |
630 if( TypePtr::above_centerline(r0->_ptr) || | |
631 TypePtr::above_centerline(r1->_ptr) ) | |
632 return Type::TOP; | |
633 | |
634 if (r0 == r1 && r0->singleton()) { | |
635 // Equal pointer constants (klasses, nulls, etc.) | |
636 return TypeInt::CC_EQ; | |
637 } | |
638 | |
639 // See if it is 2 unrelated classes. | |
640 const TypeOopPtr* p0 = r0->isa_oopptr(); | |
641 const TypeOopPtr* p1 = r1->isa_oopptr(); | |
642 if (p0 && p1) { | |
33 | 643 Node* in1 = in(1)->uncast(); |
644 Node* in2 = in(2)->uncast(); | |
645 AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL); | |
646 AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL); | |
647 if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) { | |
648 return TypeInt::CC_GT; // different pointers | |
649 } | |
0 | 650 ciKlass* klass0 = p0->klass(); |
651 bool xklass0 = p0->klass_is_exact(); | |
652 ciKlass* klass1 = p1->klass(); | |
653 bool xklass1 = p1->klass_is_exact(); | |
654 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); | |
655 if (klass0 && klass1 && | |
656 kps != 1 && // both or neither are klass pointers | |
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657 klass0->is_loaded() && !klass0->is_interface() && // do not trust interfaces |
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658 klass1->is_loaded() && !klass1->is_interface() && |
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659 (!klass0->is_obj_array_klass() || |
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660 !klass0->as_obj_array_klass()->base_element_klass()->is_interface()) && |
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661 (!klass1->is_obj_array_klass() || |
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662 !klass1->as_obj_array_klass()->base_element_klass()->is_interface())) { |
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663 bool unrelated_classes = false; |
0 | 664 // See if neither subclasses the other, or if the class on top |
296
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665 // is precise. In either of these cases, the compare is known |
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666 // to fail if at least one of the pointers is provably not null. |
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667 if (klass0->equals(klass1)) { // if types are unequal but klasses are equal |
0 | 668 // Do nothing; we know nothing for imprecise types |
669 } else if (klass0->is_subtype_of(klass1)) { | |
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670 // If klass1's type is PRECISE, then classes are unrelated. |
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671 unrelated_classes = xklass1; |
0 | 672 } else if (klass1->is_subtype_of(klass0)) { |
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673 // If klass0's type is PRECISE, then classes are unrelated. |
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674 unrelated_classes = xklass0; |
0 | 675 } else { // Neither subtypes the other |
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676 unrelated_classes = true; |
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677 } |
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678 if (unrelated_classes) { |
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679 // The oops classes are known to be unrelated. If the joined PTRs of |
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680 // two oops is not Null and not Bottom, then we are sure that one |
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681 // of the two oops is non-null, and the comparison will always fail. |
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682 TypePtr::PTR jp = r0->join_ptr(r1->_ptr); |
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683 if (jp != TypePtr::Null && jp != TypePtr::BotPTR) { |
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684 return TypeInt::CC_GT; |
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685 } |
0 | 686 } |
687 } | |
688 } | |
689 | |
690 // Known constants can be compared exactly | |
691 // Null can be distinguished from any NotNull pointers | |
692 // Unknown inputs makes an unknown result | |
693 if( r0->singleton() ) { | |
694 intptr_t bits0 = r0->get_con(); | |
695 if( r1->singleton() ) | |
696 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; | |
697 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
698 } else if( r1->singleton() ) { | |
699 intptr_t bits1 = r1->get_con(); | |
700 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
701 } else | |
702 return TypeInt::CC; | |
703 } | |
704 | |
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705 static inline Node* isa_java_mirror_load(PhaseGVN* phase, Node* n) { |
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706 // Return the klass node for |
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707 // LoadP(AddP(foo:Klass, #java_mirror)) |
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708 // or NULL if not matching. |
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709 if (n->Opcode() != Op_LoadP) return NULL; |
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710 |
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711 const TypeInstPtr* tp = phase->type(n)->isa_instptr(); |
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712 if (!tp || tp->klass() != phase->C->env()->Class_klass()) return NULL; |
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713 |
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714 Node* adr = n->in(MemNode::Address); |
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715 intptr_t off = 0; |
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716 Node* k = AddPNode::Ideal_base_and_offset(adr, phase, off); |
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717 if (k == NULL) return NULL; |
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718 const TypeKlassPtr* tkp = phase->type(k)->isa_klassptr(); |
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719 if (!tkp || off != in_bytes(Klass::java_mirror_offset())) return NULL; |
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720 |
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721 // We've found the klass node of a Java mirror load. |
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722 return k; |
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723 } |
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724 |
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725 static inline Node* isa_const_java_mirror(PhaseGVN* phase, Node* n) { |
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726 // for ConP(Foo.class) return ConP(Foo.klass) |
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727 // otherwise return NULL |
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728 if (!n->is_Con()) return NULL; |
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729 |
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730 const TypeInstPtr* tp = phase->type(n)->isa_instptr(); |
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731 if (!tp) return NULL; |
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732 |
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733 ciType* mirror_type = tp->java_mirror_type(); |
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734 // TypeInstPtr::java_mirror_type() returns non-NULL for compile- |
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735 // time Class constants only. |
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736 if (!mirror_type) return NULL; |
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737 |
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738 // x.getClass() == int.class can never be true (for all primitive types) |
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739 // Return a ConP(NULL) node for this case. |
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740 if (mirror_type->is_classless()) { |
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741 return phase->makecon(TypePtr::NULL_PTR); |
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742 } |
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743 |
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744 // return the ConP(Foo.klass) |
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745 assert(mirror_type->is_klass(), "mirror_type should represent a Klass*"); |
6131
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746 return phase->makecon(TypeKlassPtr::make(mirror_type->as_klass())); |
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747 } |
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748 |
0 | 749 //------------------------------Ideal------------------------------------------ |
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750 // Normalize comparisons between Java mirror loads to compare the klass instead. |
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751 // |
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752 // Also check for the case of comparing an unknown klass loaded from the primary |
0 | 753 // super-type array vs a known klass with no subtypes. This amounts to |
754 // checking to see an unknown klass subtypes a known klass with no subtypes; | |
755 // this only happens on an exact match. We can shorten this test by 1 load. | |
756 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
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757 // Normalize comparisons between Java mirrors into comparisons of the low- |
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758 // level klass, where a dependent load could be shortened. |
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759 // |
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760 // The new pattern has a nice effect of matching the same pattern used in the |
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761 // fast path of instanceof/checkcast/Class.isInstance(), which allows |
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762 // redundant exact type check be optimized away by GVN. |
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763 // For example, in |
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764 // if (x.getClass() == Foo.class) { |
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765 // Foo foo = (Foo) x; |
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766 // // ... use a ... |
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767 // } |
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768 // a CmpPNode could be shared between if_acmpne and checkcast |
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769 { |
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770 Node* k1 = isa_java_mirror_load(phase, in(1)); |
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771 Node* k2 = isa_java_mirror_load(phase, in(2)); |
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772 Node* conk2 = isa_const_java_mirror(phase, in(2)); |
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773 |
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774 if (k1 && (k2 || conk2)) { |
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775 Node* lhs = k1; |
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776 Node* rhs = (k2 != NULL) ? k2 : conk2; |
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777 this->set_req(1, lhs); |
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778 this->set_req(2, rhs); |
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779 return this; |
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780 } |
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781 } |
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782 |
0 | 783 // Constant pointer on right? |
784 const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr(); | |
785 if (t2 == NULL || !t2->klass_is_exact()) | |
786 return NULL; | |
787 // Get the constant klass we are comparing to. | |
788 ciKlass* superklass = t2->klass(); | |
789 | |
790 // Now check for LoadKlass on left. | |
791 Node* ldk1 = in(1); | |
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792 if (ldk1->is_DecodeNKlass()) { |
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793 ldk1 = ldk1->in(1); |
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794 if (ldk1->Opcode() != Op_LoadNKlass ) |
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795 return NULL; |
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796 } else if (ldk1->Opcode() != Op_LoadKlass ) |
0 | 797 return NULL; |
798 // Take apart the address of the LoadKlass: | |
799 Node* adr1 = ldk1->in(MemNode::Address); | |
800 intptr_t con2 = 0; | |
801 Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2); | |
802 if (ldk2 == NULL) | |
803 return NULL; | |
804 if (con2 == oopDesc::klass_offset_in_bytes()) { | |
805 // We are inspecting an object's concrete class. | |
806 // Short-circuit the check if the query is abstract. | |
807 if (superklass->is_interface() || | |
808 superklass->is_abstract()) { | |
809 // Make it come out always false: | |
810 this->set_req(2, phase->makecon(TypePtr::NULL_PTR)); | |
811 return this; | |
812 } | |
813 } | |
814 | |
815 // Check for a LoadKlass from primary supertype array. | |
816 // Any nested loadklass from loadklass+con must be from the p.s. array. | |
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817 if (ldk2->is_DecodeNKlass()) { |
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818 // Keep ldk2 as DecodeN since it could be used in CmpP below. |
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819 if (ldk2->in(1)->Opcode() != Op_LoadNKlass ) |
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820 return NULL; |
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821 } else if (ldk2->Opcode() != Op_LoadKlass) |
0 | 822 return NULL; |
823 | |
824 // Verify that we understand the situation | |
825 if (con2 != (intptr_t) superklass->super_check_offset()) | |
826 return NULL; // Might be element-klass loading from array klass | |
827 | |
828 // If 'superklass' has no subklasses and is not an interface, then we are | |
829 // assured that the only input which will pass the type check is | |
830 // 'superklass' itself. | |
831 // | |
832 // We could be more liberal here, and allow the optimization on interfaces | |
833 // which have a single implementor. This would require us to increase the | |
834 // expressiveness of the add_dependency() mechanism. | |
835 // %%% Do this after we fix TypeOopPtr: Deps are expressive enough now. | |
836 | |
837 // Object arrays must have their base element have no subtypes | |
838 while (superklass->is_obj_array_klass()) { | |
839 ciType* elem = superklass->as_obj_array_klass()->element_type(); | |
840 superklass = elem->as_klass(); | |
841 } | |
842 if (superklass->is_instance_klass()) { | |
843 ciInstanceKlass* ik = superklass->as_instance_klass(); | |
844 if (ik->has_subklass() || ik->is_interface()) return NULL; | |
845 // Add a dependency if there is a chance that a subclass will be added later. | |
846 if (!ik->is_final()) { | |
847 phase->C->dependencies()->assert_leaf_type(ik); | |
848 } | |
849 } | |
850 | |
851 // Bypass the dependent load, and compare directly | |
852 this->set_req(1,ldk2); | |
853 | |
854 return this; | |
855 } | |
856 | |
857 //============================================================================= | |
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858 //------------------------------sub-------------------------------------------- |
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859 // Simplify an CmpN (compare 2 pointers) node, based on local information. |
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860 // If both inputs are constants, compare them. |
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861 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const { |
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862 const TypePtr *r0 = t1->make_ptr(); // Handy access |
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863 const TypePtr *r1 = t2->make_ptr(); |
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864 |
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865 // Undefined inputs makes for an undefined result |
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866 if( TypePtr::above_centerline(r0->_ptr) || |
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867 TypePtr::above_centerline(r1->_ptr) ) |
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868 return Type::TOP; |
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869 |
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870 if (r0 == r1 && r0->singleton()) { |
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871 // Equal pointer constants (klasses, nulls, etc.) |
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872 return TypeInt::CC_EQ; |
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873 } |
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874 |
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875 // See if it is 2 unrelated classes. |
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876 const TypeOopPtr* p0 = r0->isa_oopptr(); |
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877 const TypeOopPtr* p1 = r1->isa_oopptr(); |
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878 if (p0 && p1) { |
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879 ciKlass* klass0 = p0->klass(); |
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880 bool xklass0 = p0->klass_is_exact(); |
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881 ciKlass* klass1 = p1->klass(); |
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882 bool xklass1 = p1->klass_is_exact(); |
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883 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); |
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884 if (klass0 && klass1 && |
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885 kps != 1 && // both or neither are klass pointers |
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886 !klass0->is_interface() && // do not trust interfaces |
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887 !klass1->is_interface()) { |
296
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888 bool unrelated_classes = false; |
113
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889 // See if neither subclasses the other, or if the class on top |
296
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890 // is precise. In either of these cases, the compare is known |
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891 // to fail if at least one of the pointers is provably not null. |
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892 if (klass0->equals(klass1)) { // if types are unequal but klasses are equal |
113
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893 // Do nothing; we know nothing for imprecise types |
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894 } else if (klass0->is_subtype_of(klass1)) { |
296
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895 // If klass1's type is PRECISE, then classes are unrelated. |
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896 unrelated_classes = xklass1; |
113
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897 } else if (klass1->is_subtype_of(klass0)) { |
296
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898 // If klass0's type is PRECISE, then classes are unrelated. |
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899 unrelated_classes = xklass0; |
113
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900 } else { // Neither subtypes the other |
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901 unrelated_classes = true; |
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902 } |
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903 if (unrelated_classes) { |
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904 // The oops classes are known to be unrelated. If the joined PTRs of |
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905 // two oops is not Null and not Bottom, then we are sure that one |
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906 // of the two oops is non-null, and the comparison will always fail. |
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907 TypePtr::PTR jp = r0->join_ptr(r1->_ptr); |
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908 if (jp != TypePtr::Null && jp != TypePtr::BotPTR) { |
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909 return TypeInt::CC_GT; |
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910 } |
113
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911 } |
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912 } |
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913 } |
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914 |
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915 // Known constants can be compared exactly |
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916 // Null can be distinguished from any NotNull pointers |
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917 // Unknown inputs makes an unknown result |
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918 if( r0->singleton() ) { |
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919 intptr_t bits0 = r0->get_con(); |
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920 if( r1->singleton() ) |
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921 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; |
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922 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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923 } else if( r1->singleton() ) { |
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924 intptr_t bits1 = r1->get_con(); |
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925 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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926 } else |
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927 return TypeInt::CC; |
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928 } |
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929 |
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930 //------------------------------Ideal------------------------------------------ |
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931 Node *CmpNNode::Ideal( PhaseGVN *phase, bool can_reshape ) { |
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932 return NULL; |
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933 } |
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934 |
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935 //============================================================================= |
0 | 936 //------------------------------Value------------------------------------------ |
937 // Simplify an CmpF (compare 2 floats ) node, based on local information. | |
938 // If both inputs are constants, compare them. | |
939 const Type *CmpFNode::Value( PhaseTransform *phase ) const { | |
940 const Node* in1 = in(1); | |
941 const Node* in2 = in(2); | |
942 // Either input is TOP ==> the result is TOP | |
943 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
944 if( t1 == Type::TOP ) return Type::TOP; | |
945 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
946 if( t2 == Type::TOP ) return Type::TOP; | |
947 | |
948 // Not constants? Don't know squat - even if they are the same | |
949 // value! If they are NaN's they compare to LT instead of EQ. | |
950 const TypeF *tf1 = t1->isa_float_constant(); | |
951 const TypeF *tf2 = t2->isa_float_constant(); | |
952 if( !tf1 || !tf2 ) return TypeInt::CC; | |
953 | |
954 // This implements the Java bytecode fcmpl, so unordered returns -1. | |
955 if( tf1->is_nan() || tf2->is_nan() ) | |
956 return TypeInt::CC_LT; | |
957 | |
958 if( tf1->_f < tf2->_f ) return TypeInt::CC_LT; | |
959 if( tf1->_f > tf2->_f ) return TypeInt::CC_GT; | |
960 assert( tf1->_f == tf2->_f, "do not understand FP behavior" ); | |
961 return TypeInt::CC_EQ; | |
962 } | |
963 | |
964 | |
965 //============================================================================= | |
966 //------------------------------Value------------------------------------------ | |
967 // Simplify an CmpD (compare 2 doubles ) node, based on local information. | |
968 // If both inputs are constants, compare them. | |
969 const Type *CmpDNode::Value( PhaseTransform *phase ) const { | |
970 const Node* in1 = in(1); | |
971 const Node* in2 = in(2); | |
972 // Either input is TOP ==> the result is TOP | |
973 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
974 if( t1 == Type::TOP ) return Type::TOP; | |
975 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
976 if( t2 == Type::TOP ) return Type::TOP; | |
977 | |
978 // Not constants? Don't know squat - even if they are the same | |
979 // value! If they are NaN's they compare to LT instead of EQ. | |
980 const TypeD *td1 = t1->isa_double_constant(); | |
981 const TypeD *td2 = t2->isa_double_constant(); | |
982 if( !td1 || !td2 ) return TypeInt::CC; | |
983 | |
984 // This implements the Java bytecode dcmpl, so unordered returns -1. | |
985 if( td1->is_nan() || td2->is_nan() ) | |
986 return TypeInt::CC_LT; | |
987 | |
988 if( td1->_d < td2->_d ) return TypeInt::CC_LT; | |
989 if( td1->_d > td2->_d ) return TypeInt::CC_GT; | |
990 assert( td1->_d == td2->_d, "do not understand FP behavior" ); | |
991 return TypeInt::CC_EQ; | |
992 } | |
993 | |
994 //------------------------------Ideal------------------------------------------ | |
995 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
996 // Check if we can change this to a CmpF and remove a ConvD2F operation. | |
997 // Change (CMPD (F2D (float)) (ConD value)) | |
998 // To (CMPF (float) (ConF value)) | |
999 // Valid when 'value' does not lose precision as a float. | |
1000 // Benefits: eliminates conversion, does not require 24-bit mode | |
1001 | |
1002 // NaNs prevent commuting operands. This transform works regardless of the | |
1003 // order of ConD and ConvF2D inputs by preserving the original order. | |
1004 int idx_f2d = 1; // ConvF2D on left side? | |
1005 if( in(idx_f2d)->Opcode() != Op_ConvF2D ) | |
1006 idx_f2d = 2; // No, swap to check for reversed args | |
1007 int idx_con = 3-idx_f2d; // Check for the constant on other input | |
1008 | |
1009 if( ConvertCmpD2CmpF && | |
1010 in(idx_f2d)->Opcode() == Op_ConvF2D && | |
1011 in(idx_con)->Opcode() == Op_ConD ) { | |
1012 const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant(); | |
1013 double t2_value_as_double = t2->_d; | |
1014 float t2_value_as_float = (float)t2_value_as_double; | |
1015 if( t2_value_as_double == (double)t2_value_as_float ) { | |
1016 // Test value can be represented as a float | |
1017 // Eliminate the conversion to double and create new comparison | |
1018 Node *new_in1 = in(idx_f2d)->in(1); | |
1019 Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) ); | |
1020 if( idx_f2d != 1 ) { // Must flip args to match original order | |
1021 Node *tmp = new_in1; | |
1022 new_in1 = new_in2; | |
1023 new_in2 = tmp; | |
1024 } | |
1025 CmpFNode *new_cmp = (Opcode() == Op_CmpD3) | |
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1026 ? new (phase->C) CmpF3Node( new_in1, new_in2 ) |
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1027 : new (phase->C) CmpFNode ( new_in1, new_in2 ) ; |
0 | 1028 return new_cmp; // Changed to CmpFNode |
1029 } | |
1030 // Testing value required the precision of a double | |
1031 } | |
1032 return NULL; // No change | |
1033 } | |
1034 | |
1035 | |
1036 //============================================================================= | |
1037 //------------------------------cc2logical------------------------------------- | |
1038 // Convert a condition code type to a logical type | |
1039 const Type *BoolTest::cc2logical( const Type *CC ) const { | |
1040 if( CC == Type::TOP ) return Type::TOP; | |
1041 if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse | |
1042 const TypeInt *ti = CC->is_int(); | |
1043 if( ti->is_con() ) { // Only 1 kind of condition codes set? | |
1044 // Match low order 2 bits | |
1045 int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0; | |
1046 if( _test & 4 ) tmp = 1-tmp; // Optionally complement result | |
1047 return TypeInt::make(tmp); // Boolean result | |
1048 } | |
1049 | |
1050 if( CC == TypeInt::CC_GE ) { | |
1051 if( _test == ge ) return TypeInt::ONE; | |
1052 if( _test == lt ) return TypeInt::ZERO; | |
1053 } | |
1054 if( CC == TypeInt::CC_LE ) { | |
1055 if( _test == le ) return TypeInt::ONE; | |
1056 if( _test == gt ) return TypeInt::ZERO; | |
1057 } | |
1058 | |
1059 return TypeInt::BOOL; | |
1060 } | |
1061 | |
1062 //------------------------------dump_spec------------------------------------- | |
1063 // Print special per-node info | |
1064 #ifndef PRODUCT | |
1065 void BoolTest::dump_on(outputStream *st) const { | |
1066 const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"}; | |
1067 st->print(msg[_test]); | |
1068 } | |
1069 #endif | |
1070 | |
1071 //============================================================================= | |
1072 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); } | |
1073 uint BoolNode::size_of() const { return sizeof(BoolNode); } | |
1074 | |
1075 //------------------------------operator==------------------------------------- | |
1076 uint BoolNode::cmp( const Node &n ) const { | |
1077 const BoolNode *b = (const BoolNode *)&n; // Cast up | |
1078 return (_test._test == b->_test._test); | |
1079 } | |
1080 | |
1081 //------------------------------clone_cmp-------------------------------------- | |
1082 // Clone a compare/bool tree | |
1083 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) { | |
1084 Node *ncmp = cmp->clone(); | |
1085 ncmp->set_req(1,cmp1); | |
1086 ncmp->set_req(2,cmp2); | |
1087 ncmp = gvn->transform( ncmp ); | |
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1088 return new (gvn->C) BoolNode( ncmp, test ); |
0 | 1089 } |
1090 | |
1091 //-------------------------------make_predicate-------------------------------- | |
1092 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) { | |
1093 if (test_value->is_Con()) return test_value; | |
1094 if (test_value->is_Bool()) return test_value; | |
1095 Compile* C = phase->C; | |
1096 if (test_value->is_CMove() && | |
1097 test_value->in(CMoveNode::Condition)->is_Bool()) { | |
1098 BoolNode* bol = test_value->in(CMoveNode::Condition)->as_Bool(); | |
1099 const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse)); | |
1100 const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue)); | |
1101 if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) { | |
1102 return bol; | |
1103 } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) { | |
1104 return phase->transform( bol->negate(phase) ); | |
1105 } | |
1106 // Else fall through. The CMove gets in the way of the test. | |
1107 // It should be the case that make_predicate(bol->as_int_value()) == bol. | |
1108 } | |
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1109 Node* cmp = new (C) CmpINode(test_value, phase->intcon(0)); |
0 | 1110 cmp = phase->transform(cmp); |
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1111 Node* bol = new (C) BoolNode(cmp, BoolTest::ne); |
0 | 1112 return phase->transform(bol); |
1113 } | |
1114 | |
1115 //--------------------------------as_int_value--------------------------------- | |
1116 Node* BoolNode::as_int_value(PhaseGVN* phase) { | |
1117 // Inverse to make_predicate. The CMove probably boils down to a Conv2B. | |
1118 Node* cmov = CMoveNode::make(phase->C, NULL, this, | |
1119 phase->intcon(0), phase->intcon(1), | |
1120 TypeInt::BOOL); | |
1121 return phase->transform(cmov); | |
1122 } | |
1123 | |
1124 //----------------------------------negate------------------------------------- | |
1125 BoolNode* BoolNode::negate(PhaseGVN* phase) { | |
1126 Compile* C = phase->C; | |
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1127 return new (C) BoolNode(in(1), _test.negate()); |
0 | 1128 } |
1129 | |
1130 | |
1131 //------------------------------Ideal------------------------------------------ | |
1132 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1133 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)". | |
1134 // This moves the constant to the right. Helps value-numbering. | |
1135 Node *cmp = in(1); | |
1136 if( !cmp->is_Sub() ) return NULL; | |
1137 int cop = cmp->Opcode(); | |
1138 if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL; | |
1139 Node *cmp1 = cmp->in(1); | |
1140 Node *cmp2 = cmp->in(2); | |
1141 if( !cmp1 ) return NULL; | |
1142 | |
1143 // Constant on left? | |
1144 Node *con = cmp1; | |
1145 uint op2 = cmp2->Opcode(); | |
1146 // Move constants to the right of compare's to canonicalize. | |
1147 // Do not muck with Opaque1 nodes, as this indicates a loop | |
1148 // guard that cannot change shape. | |
1149 if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 && | |
1150 // Because of NaN's, CmpD and CmpF are not commutative | |
1151 cop != Op_CmpD && cop != Op_CmpF && | |
1152 // Protect against swapping inputs to a compare when it is used by a | |
1153 // counted loop exit, which requires maintaining the loop-limit as in(2) | |
1154 !is_counted_loop_exit_test() ) { | |
1155 // Ok, commute the constant to the right of the cmp node. | |
1156 // Clone the Node, getting a new Node of the same class | |
1157 cmp = cmp->clone(); | |
1158 // Swap inputs to the clone | |
1159 cmp->swap_edges(1, 2); | |
1160 cmp = phase->transform( cmp ); | |
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1161 return new (phase->C) BoolNode( cmp, _test.commute() ); |
0 | 1162 } |
1163 | |
1164 // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)". | |
1165 // The XOR-1 is an idiom used to flip the sense of a bool. We flip the | |
1166 // test instead. | |
1167 int cmp1_op = cmp1->Opcode(); | |
1168 const TypeInt* cmp2_type = phase->type(cmp2)->isa_int(); | |
1169 if (cmp2_type == NULL) return NULL; | |
1170 Node* j_xor = cmp1; | |
1171 if( cmp2_type == TypeInt::ZERO && | |
1172 cmp1_op == Op_XorI && | |
1173 j_xor->in(1) != j_xor && // An xor of itself is dead | |
3743 | 1174 phase->type( j_xor->in(1) ) == TypeInt::BOOL && |
0 | 1175 phase->type( j_xor->in(2) ) == TypeInt::ONE && |
1176 (_test._test == BoolTest::eq || | |
1177 _test._test == BoolTest::ne) ) { | |
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1178 Node *ncmp = phase->transform(new (phase->C) CmpINode(j_xor->in(1),cmp2)); |
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1179 return new (phase->C) BoolNode( ncmp, _test.negate() ); |
0 | 1180 } |
1181 | |
1182 // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)". | |
1183 // This is a standard idiom for branching on a boolean value. | |
1184 Node *c2b = cmp1; | |
1185 if( cmp2_type == TypeInt::ZERO && | |
1186 cmp1_op == Op_Conv2B && | |
1187 (_test._test == BoolTest::eq || | |
1188 _test._test == BoolTest::ne) ) { | |
1189 Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int() | |
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1190 ? (Node*)new (phase->C) CmpINode(c2b->in(1),cmp2) |
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1191 : (Node*)new (phase->C) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR)) |
0 | 1192 ); |
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1193 return new (phase->C) BoolNode( ncmp, _test._test ); |
0 | 1194 } |
1195 | |
1196 // Comparing a SubI against a zero is equal to comparing the SubI | |
1197 // arguments directly. This only works for eq and ne comparisons | |
1198 // due to possible integer overflow. | |
1199 if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) && | |
1200 (cop == Op_CmpI) && | |
1201 (cmp1->Opcode() == Op_SubI) && | |
1202 ( cmp2_type == TypeInt::ZERO ) ) { | |
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1203 Node *ncmp = phase->transform( new (phase->C) CmpINode(cmp1->in(1),cmp1->in(2))); |
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1204 return new (phase->C) BoolNode( ncmp, _test._test ); |
0 | 1205 } |
1206 | |
1207 // Change (-A vs 0) into (A vs 0) by commuting the test. Disallow in the | |
1208 // most general case because negating 0x80000000 does nothing. Needed for | |
1209 // the CmpF3/SubI/CmpI idiom. | |
1210 if( cop == Op_CmpI && | |
1211 cmp1->Opcode() == Op_SubI && | |
1212 cmp2_type == TypeInt::ZERO && | |
1213 phase->type( cmp1->in(1) ) == TypeInt::ZERO && | |
1214 phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) { | |
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1215 Node *ncmp = phase->transform( new (phase->C) CmpINode(cmp1->in(2),cmp2)); |
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1216 return new (phase->C) BoolNode( ncmp, _test.commute() ); |
0 | 1217 } |
1218 | |
1219 // The transformation below is not valid for either signed or unsigned | |
1220 // comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE. | |
1221 // This transformation can be resurrected when we are able to | |
1222 // make inferences about the range of values being subtracted from | |
1223 // (or added to) relative to the wraparound point. | |
1224 // | |
1225 // // Remove +/-1's if possible. | |
1226 // // "X <= Y-1" becomes "X < Y" | |
1227 // // "X+1 <= Y" becomes "X < Y" | |
1228 // // "X < Y+1" becomes "X <= Y" | |
1229 // // "X-1 < Y" becomes "X <= Y" | |
1230 // // Do not this to compares off of the counted-loop-end. These guys are | |
1231 // // checking the trip counter and they want to use the post-incremented | |
1232 // // counter. If they use the PRE-incremented counter, then the counter has | |
1233 // // to be incremented in a private block on a loop backedge. | |
1234 // if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd ) | |
1235 // return NULL; | |
1236 // #ifndef PRODUCT | |
1237 // // Do not do this in a wash GVN pass during verification. | |
1238 // // Gets triggered by too many simple optimizations to be bothered with | |
1239 // // re-trying it again and again. | |
1240 // if( !phase->allow_progress() ) return NULL; | |
1241 // #endif | |
1242 // // Not valid for unsigned compare because of corner cases in involving zero. | |
1243 // // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an | |
1244 // // exception in case X is 0 (because 0-1 turns into 4billion unsigned but | |
1245 // // "0 <=u Y" is always true). | |
1246 // if( cmp->Opcode() == Op_CmpU ) return NULL; | |
1247 // int cmp2_op = cmp2->Opcode(); | |
1248 // if( _test._test == BoolTest::le ) { | |
1249 // if( cmp1_op == Op_AddI && | |
1250 // phase->type( cmp1->in(2) ) == TypeInt::ONE ) | |
1251 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt ); | |
1252 // else if( cmp2_op == Op_AddI && | |
1253 // phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 ) | |
1254 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt ); | |
1255 // } else if( _test._test == BoolTest::lt ) { | |
1256 // if( cmp1_op == Op_AddI && | |
1257 // phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 ) | |
1258 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le ); | |
1259 // else if( cmp2_op == Op_AddI && | |
1260 // phase->type( cmp2->in(2) ) == TypeInt::ONE ) | |
1261 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le ); | |
1262 // } | |
1263 | |
1264 return NULL; | |
1265 } | |
1266 | |
1267 //------------------------------Value------------------------------------------ | |
1268 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node, | |
1269 // based on local information. If the input is constant, do it. | |
1270 const Type *BoolNode::Value( PhaseTransform *phase ) const { | |
1271 return _test.cc2logical( phase->type( in(1) ) ); | |
1272 } | |
1273 | |
1274 //------------------------------dump_spec-------------------------------------- | |
1275 // Dump special per-node info | |
1276 #ifndef PRODUCT | |
1277 void BoolNode::dump_spec(outputStream *st) const { | |
1278 st->print("["); | |
1279 _test.dump_on(st); | |
1280 st->print("]"); | |
1281 } | |
1282 #endif | |
1283 | |
1284 //------------------------------is_counted_loop_exit_test-------------------------------------- | |
1285 // Returns true if node is used by a counted loop node. | |
1286 bool BoolNode::is_counted_loop_exit_test() { | |
1287 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { | |
1288 Node* use = fast_out(i); | |
1289 if (use->is_CountedLoopEnd()) { | |
1290 return true; | |
1291 } | |
1292 } | |
1293 return false; | |
1294 } | |
1295 | |
1296 //============================================================================= | |
1297 //------------------------------Value------------------------------------------ | |
1298 // Compute sqrt | |
1299 const Type *SqrtDNode::Value( PhaseTransform *phase ) const { | |
1300 const Type *t1 = phase->type( in(1) ); | |
1301 if( t1 == Type::TOP ) return Type::TOP; | |
1302 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1303 double d = t1->getd(); | |
1304 if( d < 0.0 ) return Type::DOUBLE; | |
1305 return TypeD::make( sqrt( d ) ); | |
1306 } | |
1307 | |
1308 //============================================================================= | |
1309 //------------------------------Value------------------------------------------ | |
1310 // Compute cos | |
1311 const Type *CosDNode::Value( PhaseTransform *phase ) const { | |
1312 const Type *t1 = phase->type( in(1) ); | |
1313 if( t1 == Type::TOP ) return Type::TOP; | |
1314 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1315 double d = t1->getd(); | |
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1316 return TypeD::make( StubRoutines::intrinsic_cos( d ) ); |
0 | 1317 } |
1318 | |
1319 //============================================================================= | |
1320 //------------------------------Value------------------------------------------ | |
1321 // Compute sin | |
1322 const Type *SinDNode::Value( PhaseTransform *phase ) const { | |
1323 const Type *t1 = phase->type( in(1) ); | |
1324 if( t1 == Type::TOP ) return Type::TOP; | |
1325 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1326 double d = t1->getd(); | |
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1327 return TypeD::make( StubRoutines::intrinsic_sin( d ) ); |
0 | 1328 } |
1329 | |
1330 //============================================================================= | |
1331 //------------------------------Value------------------------------------------ | |
1332 // Compute tan | |
1333 const Type *TanDNode::Value( PhaseTransform *phase ) const { | |
1334 const Type *t1 = phase->type( in(1) ); | |
1335 if( t1 == Type::TOP ) return Type::TOP; | |
1336 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1337 double d = t1->getd(); | |
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1338 return TypeD::make( StubRoutines::intrinsic_tan( d ) ); |
0 | 1339 } |
1340 | |
1341 //============================================================================= | |
1342 //------------------------------Value------------------------------------------ | |
1343 // Compute log | |
1344 const Type *LogDNode::Value( PhaseTransform *phase ) const { | |
1345 const Type *t1 = phase->type( in(1) ); | |
1346 if( t1 == Type::TOP ) return Type::TOP; | |
1347 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1348 double d = t1->getd(); | |
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1349 return TypeD::make( StubRoutines::intrinsic_log( d ) ); |
0 | 1350 } |
1351 | |
1352 //============================================================================= | |
1353 //------------------------------Value------------------------------------------ | |
1354 // Compute log10 | |
1355 const Type *Log10DNode::Value( PhaseTransform *phase ) const { | |
1356 const Type *t1 = phase->type( in(1) ); | |
1357 if( t1 == Type::TOP ) return Type::TOP; | |
1358 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1359 double d = t1->getd(); | |
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1360 return TypeD::make( StubRoutines::intrinsic_log10( d ) ); |
0 | 1361 } |
1362 | |
1363 //============================================================================= | |
1364 //------------------------------Value------------------------------------------ | |
1365 // Compute exp | |
1366 const Type *ExpDNode::Value( PhaseTransform *phase ) const { | |
1367 const Type *t1 = phase->type( in(1) ); | |
1368 if( t1 == Type::TOP ) return Type::TOP; | |
1369 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1370 double d = t1->getd(); | |
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1371 return TypeD::make( StubRoutines::intrinsic_exp( d ) ); |
0 | 1372 } |
1373 | |
1374 | |
1375 //============================================================================= | |
1376 //------------------------------Value------------------------------------------ | |
1377 // Compute pow | |
1378 const Type *PowDNode::Value( PhaseTransform *phase ) const { | |
1379 const Type *t1 = phase->type( in(1) ); | |
1380 if( t1 == Type::TOP ) return Type::TOP; | |
1381 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1382 const Type *t2 = phase->type( in(2) ); | |
1383 if( t2 == Type::TOP ) return Type::TOP; | |
1384 if( t2->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1385 double d1 = t1->getd(); | |
1386 double d2 = t2->getd(); | |
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1387 return TypeD::make( StubRoutines::intrinsic_pow( d1, d2 ) ); |
0 | 1388 } |