Mercurial > hg > graal-compiler
annotate src/share/vm/opto/subnode.cpp @ 221:1e026f8da827
6710487: More than half of JDI Regression tests hang with COOPs in -Xcomp mode
Summary: Remove DecodeNNode::decode() and EncodePNode::encode() methods.
Reviewed-by: rasbold, never
author | kvn |
---|---|
date | Tue, 24 Jun 2008 10:43:29 -0700 |
parents | 99bf1609e2a5 |
children | 9c2ecc2ffb12 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
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 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Portions of code courtesy of Clifford Click | |
26 | |
27 // Optimization - Graph Style | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_subnode.cpp.incl" | |
31 #include "math.h" | |
32 | |
33 //============================================================================= | |
34 //------------------------------Identity--------------------------------------- | |
35 // If right input is a constant 0, return the left input. | |
36 Node *SubNode::Identity( PhaseTransform *phase ) { | |
37 assert(in(1) != this, "Must already have called Value"); | |
38 assert(in(2) != this, "Must already have called Value"); | |
39 | |
40 // Remove double negation | |
41 const Type *zero = add_id(); | |
42 if( phase->type( in(1) )->higher_equal( zero ) && | |
43 in(2)->Opcode() == Opcode() && | |
44 phase->type( in(2)->in(1) )->higher_equal( zero ) ) { | |
45 return in(2)->in(2); | |
46 } | |
47 | |
212 | 48 // Convert "(X+Y) - Y" into X and "(X+Y) - X" into Y |
0 | 49 if( in(1)->Opcode() == Op_AddI ) { |
50 if( phase->eqv(in(1)->in(2),in(2)) ) | |
51 return in(1)->in(1); | |
212 | 52 if (phase->eqv(in(1)->in(1),in(2))) |
53 return in(1)->in(2); | |
54 | |
0 | 55 // Also catch: "(X + Opaque2(Y)) - Y". In this case, 'Y' is a loop-varying |
56 // trip counter and X is likely to be loop-invariant (that's how O2 Nodes | |
57 // are originally used, although the optimizer sometimes jiggers things). | |
58 // This folding through an O2 removes a loop-exit use of a loop-varying | |
59 // value and generally lowers register pressure in and around the loop. | |
60 if( in(1)->in(2)->Opcode() == Op_Opaque2 && | |
61 phase->eqv(in(1)->in(2)->in(1),in(2)) ) | |
62 return in(1)->in(1); | |
63 } | |
64 | |
65 return ( phase->type( in(2) )->higher_equal( zero ) ) ? in(1) : this; | |
66 } | |
67 | |
68 //------------------------------Value------------------------------------------ | |
69 // A subtract node differences it's two inputs. | |
70 const Type *SubNode::Value( PhaseTransform *phase ) const { | |
71 const Node* in1 = in(1); | |
72 const Node* in2 = in(2); | |
73 // Either input is TOP ==> the result is TOP | |
74 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
75 if( t1 == Type::TOP ) return Type::TOP; | |
76 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
77 if( t2 == Type::TOP ) return Type::TOP; | |
78 | |
79 // Not correct for SubFnode and AddFNode (must check for infinity) | |
80 // Equal? Subtract is zero | |
81 if (phase->eqv_uncast(in1, in2)) return add_id(); | |
82 | |
83 // Either input is BOTTOM ==> the result is the local BOTTOM | |
84 if( t1 == Type::BOTTOM || t2 == Type::BOTTOM ) | |
85 return bottom_type(); | |
86 | |
87 return sub(t1,t2); // Local flavor of type subtraction | |
88 | |
89 } | |
90 | |
91 //============================================================================= | |
92 | |
93 //------------------------------Helper function-------------------------------- | |
94 static bool ok_to_convert(Node* inc, Node* iv) { | |
95 // Do not collapse (x+c0)-y if "+" is a loop increment, because the | |
96 // "-" is loop invariant and collapsing extends the live-range of "x" | |
97 // to overlap with the "+", forcing another register to be used in | |
98 // the loop. | |
99 // This test will be clearer with '&&' (apply DeMorgan's rule) | |
100 // but I like the early cutouts that happen here. | |
101 const PhiNode *phi; | |
102 if( ( !inc->in(1)->is_Phi() || | |
103 !(phi=inc->in(1)->as_Phi()) || | |
104 phi->is_copy() || | |
105 !phi->region()->is_CountedLoop() || | |
106 inc != phi->region()->as_CountedLoop()->incr() ) | |
107 && | |
108 // Do not collapse (x+c0)-iv if "iv" is a loop induction variable, | |
109 // because "x" maybe invariant. | |
110 ( !iv->is_loop_iv() ) | |
111 ) { | |
112 return true; | |
113 } else { | |
114 return false; | |
115 } | |
116 } | |
117 //------------------------------Ideal------------------------------------------ | |
118 Node *SubINode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
119 Node *in1 = in(1); | |
120 Node *in2 = in(2); | |
121 uint op1 = in1->Opcode(); | |
122 uint op2 = in2->Opcode(); | |
123 | |
124 #ifdef ASSERT | |
125 // Check for dead loop | |
126 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
127 ( op1 == Op_AddI || op1 == Op_SubI ) && | |
128 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
129 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
130 assert(false, "dead loop in SubINode::Ideal"); | |
131 #endif | |
132 | |
133 const Type *t2 = phase->type( in2 ); | |
134 if( t2 == Type::TOP ) return NULL; | |
135 // Convert "x-c0" into "x+ -c0". | |
136 if( t2->base() == Type::Int ){ // Might be bottom or top... | |
137 const TypeInt *i = t2->is_int(); | |
138 if( i->is_con() ) | |
139 return new (phase->C, 3) AddINode(in1, phase->intcon(-i->get_con())); | |
140 } | |
141 | |
142 // Convert "(x+c0) - y" into (x-y) + c0" | |
143 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
144 // if "y" is a loop induction variable. | |
145 if( op1 == Op_AddI && ok_to_convert(in1, in2) ) { | |
146 const Type *tadd = phase->type( in1->in(2) ); | |
147 if( tadd->singleton() && tadd != Type::TOP ) { | |
148 Node *sub2 = phase->transform( new (phase->C, 3) SubINode( in1->in(1), in2 )); | |
149 return new (phase->C, 3) AddINode( sub2, in1->in(2) ); | |
150 } | |
151 } | |
152 | |
153 | |
154 // Convert "x - (y+c0)" into "(x-y) - c0" | |
155 // Need the same check as in above optimization but reversed. | |
156 if (op2 == Op_AddI && ok_to_convert(in2, in1)) { | |
157 Node* in21 = in2->in(1); | |
158 Node* in22 = in2->in(2); | |
159 const TypeInt* tcon = phase->type(in22)->isa_int(); | |
160 if (tcon != NULL && tcon->is_con()) { | |
161 Node* sub2 = phase->transform( new (phase->C, 3) SubINode(in1, in21) ); | |
162 Node* neg_c0 = phase->intcon(- tcon->get_con()); | |
163 return new (phase->C, 3) AddINode(sub2, neg_c0); | |
164 } | |
165 } | |
166 | |
167 const Type *t1 = phase->type( in1 ); | |
168 if( t1 == Type::TOP ) return NULL; | |
169 | |
170 #ifdef ASSERT | |
171 // Check for dead loop | |
172 if( ( op2 == Op_AddI || op2 == Op_SubI ) && | |
173 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
174 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
175 assert(false, "dead loop in SubINode::Ideal"); | |
176 #endif | |
177 | |
178 // Convert "x - (x+y)" into "-y" | |
179 if( op2 == Op_AddI && | |
180 phase->eqv( in1, in2->in(1) ) ) | |
181 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(2)); | |
182 // Convert "(x-y) - x" into "-y" | |
183 if( op1 == Op_SubI && | |
184 phase->eqv( in1->in(1), in2 ) ) | |
185 return new (phase->C, 3) SubINode( phase->intcon(0),in1->in(2)); | |
186 // Convert "x - (y+x)" into "-y" | |
187 if( op2 == Op_AddI && | |
188 phase->eqv( in1, in2->in(2) ) ) | |
189 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(1)); | |
190 | |
191 // Convert "0 - (x-y)" into "y-x" | |
192 if( t1 == TypeInt::ZERO && op2 == Op_SubI ) | |
193 return new (phase->C, 3) SubINode( in2->in(2), in2->in(1) ); | |
194 | |
195 // Convert "0 - (x+con)" into "-con-x" | |
196 jint con; | |
197 if( t1 == TypeInt::ZERO && op2 == Op_AddI && | |
198 (con = in2->in(2)->find_int_con(0)) != 0 ) | |
199 return new (phase->C, 3) SubINode( phase->intcon(-con), in2->in(1) ); | |
200 | |
201 // Convert "(X+A) - (X+B)" into "A - B" | |
202 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(1) ) | |
203 return new (phase->C, 3) SubINode( in1->in(2), in2->in(2) ); | |
204 | |
205 // Convert "(A+X) - (B+X)" into "A - B" | |
206 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) ) | |
207 return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) ); | |
208 | |
209 // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally | |
210 // nicer to optimize than subtract. | |
211 if( op2 == Op_SubI && in2->outcnt() == 1) { | |
212 Node *add1 = phase->transform( new (phase->C, 3) AddINode( in1, in2->in(2) ) ); | |
213 return new (phase->C, 3) SubINode( add1, in2->in(1) ); | |
214 } | |
215 | |
216 return NULL; | |
217 } | |
218 | |
219 //------------------------------sub-------------------------------------------- | |
220 // A subtract node differences it's two inputs. | |
221 const Type *SubINode::sub( const Type *t1, const Type *t2 ) const { | |
222 const TypeInt *r0 = t1->is_int(); // Handy access | |
223 const TypeInt *r1 = t2->is_int(); | |
224 int32 lo = r0->_lo - r1->_hi; | |
225 int32 hi = r0->_hi - r1->_lo; | |
226 | |
227 // We next check for 32-bit overflow. | |
228 // If that happens, we just assume all integers are possible. | |
229 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
230 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
231 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
232 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
233 return TypeInt::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
234 else // Overflow; assume all integers | |
235 return TypeInt::INT; | |
236 } | |
237 | |
238 //============================================================================= | |
239 //------------------------------Ideal------------------------------------------ | |
240 Node *SubLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
241 Node *in1 = in(1); | |
242 Node *in2 = in(2); | |
243 uint op1 = in1->Opcode(); | |
244 uint op2 = in2->Opcode(); | |
245 | |
246 #ifdef ASSERT | |
247 // Check for dead loop | |
248 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
249 ( op1 == Op_AddL || op1 == Op_SubL ) && | |
250 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
251 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
252 assert(false, "dead loop in SubLNode::Ideal"); | |
253 #endif | |
254 | |
255 if( phase->type( in2 ) == Type::TOP ) return NULL; | |
256 const TypeLong *i = phase->type( in2 )->isa_long(); | |
257 // Convert "x-c0" into "x+ -c0". | |
258 if( i && // Might be bottom or top... | |
259 i->is_con() ) | |
260 return new (phase->C, 3) AddLNode(in1, phase->longcon(-i->get_con())); | |
261 | |
262 // Convert "(x+c0) - y" into (x-y) + c0" | |
263 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
264 // if "y" is a loop induction variable. | |
265 if( op1 == Op_AddL && ok_to_convert(in1, in2) ) { | |
266 Node *in11 = in1->in(1); | |
267 const Type *tadd = phase->type( in1->in(2) ); | |
268 if( tadd->singleton() && tadd != Type::TOP ) { | |
269 Node *sub2 = phase->transform( new (phase->C, 3) SubLNode( in11, in2 )); | |
270 return new (phase->C, 3) AddLNode( sub2, in1->in(2) ); | |
271 } | |
272 } | |
273 | |
274 // Convert "x - (y+c0)" into "(x-y) - c0" | |
275 // Need the same check as in above optimization but reversed. | |
276 if (op2 == Op_AddL && ok_to_convert(in2, in1)) { | |
277 Node* in21 = in2->in(1); | |
278 Node* in22 = in2->in(2); | |
279 const TypeLong* tcon = phase->type(in22)->isa_long(); | |
280 if (tcon != NULL && tcon->is_con()) { | |
281 Node* sub2 = phase->transform( new (phase->C, 3) SubLNode(in1, in21) ); | |
282 Node* neg_c0 = phase->longcon(- tcon->get_con()); | |
283 return new (phase->C, 3) AddLNode(sub2, neg_c0); | |
284 } | |
285 } | |
286 | |
287 const Type *t1 = phase->type( in1 ); | |
288 if( t1 == Type::TOP ) return NULL; | |
289 | |
290 #ifdef ASSERT | |
291 // Check for dead loop | |
292 if( ( op2 == Op_AddL || op2 == Op_SubL ) && | |
293 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
294 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
295 assert(false, "dead loop in SubLNode::Ideal"); | |
296 #endif | |
297 | |
298 // Convert "x - (x+y)" into "-y" | |
299 if( op2 == Op_AddL && | |
300 phase->eqv( in1, in2->in(1) ) ) | |
301 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO), in2->in(2)); | |
302 // Convert "x - (y+x)" into "-y" | |
303 if( op2 == Op_AddL && | |
304 phase->eqv( in1, in2->in(2) ) ) | |
305 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO),in2->in(1)); | |
306 | |
307 // Convert "0 - (x-y)" into "y-x" | |
308 if( phase->type( in1 ) == TypeLong::ZERO && op2 == Op_SubL ) | |
309 return new (phase->C, 3) SubLNode( in2->in(2), in2->in(1) ); | |
310 | |
311 // Convert "(X+A) - (X+B)" into "A - B" | |
312 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(1) == in2->in(1) ) | |
313 return new (phase->C, 3) SubLNode( in1->in(2), in2->in(2) ); | |
314 | |
315 // Convert "(A+X) - (B+X)" into "A - B" | |
316 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(2) == in2->in(2) ) | |
317 return new (phase->C, 3) SubLNode( in1->in(1), in2->in(1) ); | |
318 | |
319 // Convert "A-(B-C)" into (A+C)-B" | |
320 if( op2 == Op_SubL && in2->outcnt() == 1) { | |
321 Node *add1 = phase->transform( new (phase->C, 3) AddLNode( in1, in2->in(2) ) ); | |
322 return new (phase->C, 3) SubLNode( add1, in2->in(1) ); | |
323 } | |
324 | |
325 return NULL; | |
326 } | |
327 | |
328 //------------------------------sub-------------------------------------------- | |
329 // A subtract node differences it's two inputs. | |
330 const Type *SubLNode::sub( const Type *t1, const Type *t2 ) const { | |
331 const TypeLong *r0 = t1->is_long(); // Handy access | |
332 const TypeLong *r1 = t2->is_long(); | |
333 jlong lo = r0->_lo - r1->_hi; | |
334 jlong hi = r0->_hi - r1->_lo; | |
335 | |
336 // We next check for 32-bit overflow. | |
337 // If that happens, we just assume all integers are possible. | |
338 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
339 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
340 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
341 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
342 return TypeLong::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
343 else // Overflow; assume all integers | |
344 return TypeLong::LONG; | |
345 } | |
346 | |
347 //============================================================================= | |
348 //------------------------------Value------------------------------------------ | |
349 // A subtract node differences its two inputs. | |
350 const Type *SubFPNode::Value( PhaseTransform *phase ) const { | |
351 const Node* in1 = in(1); | |
352 const Node* in2 = in(2); | |
353 // Either input is TOP ==> the result is TOP | |
354 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
355 if( t1 == Type::TOP ) return Type::TOP; | |
356 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
357 if( t2 == Type::TOP ) return Type::TOP; | |
358 | |
359 // if both operands are infinity of same sign, the result is NaN; do | |
360 // not replace with zero | |
361 if( (t1->is_finite() && t2->is_finite()) ) { | |
362 if( phase->eqv(in1, in2) ) return add_id(); | |
363 } | |
364 | |
365 // Either input is BOTTOM ==> the result is the local BOTTOM | |
366 const Type *bot = bottom_type(); | |
367 if( (t1 == bot) || (t2 == bot) || | |
368 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
369 return bot; | |
370 | |
371 return sub(t1,t2); // Local flavor of type subtraction | |
372 } | |
373 | |
374 | |
375 //============================================================================= | |
376 //------------------------------Ideal------------------------------------------ | |
377 Node *SubFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
378 const Type *t2 = phase->type( in(2) ); | |
379 // Convert "x-c0" into "x+ -c0". | |
380 if( t2->base() == Type::FloatCon ) { // Might be bottom or top... | |
381 // return new (phase->C, 3) AddFNode(in(1), phase->makecon( TypeF::make(-t2->getf()) ) ); | |
382 } | |
383 | |
384 // Not associative because of boundary conditions (infinity) | |
385 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
386 // Convert "x - (x+y)" into "-y" | |
387 if( in(2)->is_Add() && | |
388 phase->eqv(in(1),in(2)->in(1) ) ) | |
389 return new (phase->C, 3) SubFNode( phase->makecon(TypeF::ZERO),in(2)->in(2)); | |
390 } | |
391 | |
392 // Cannot replace 0.0-X with -X because a 'fsub' bytecode computes | |
393 // 0.0-0.0 as +0.0, while a 'fneg' bytecode computes -0.0. | |
394 //if( phase->type(in(1)) == TypeF::ZERO ) | |
395 //return new (phase->C, 2) NegFNode(in(2)); | |
396 | |
397 return NULL; | |
398 } | |
399 | |
400 //------------------------------sub-------------------------------------------- | |
401 // A subtract node differences its two inputs. | |
402 const Type *SubFNode::sub( const Type *t1, const Type *t2 ) const { | |
403 // no folding if one of operands is infinity or NaN, do not do constant folding | |
404 if( g_isfinite(t1->getf()) && g_isfinite(t2->getf()) ) { | |
405 return TypeF::make( t1->getf() - t2->getf() ); | |
406 } | |
407 else if( g_isnan(t1->getf()) ) { | |
408 return t1; | |
409 } | |
410 else if( g_isnan(t2->getf()) ) { | |
411 return t2; | |
412 } | |
413 else { | |
414 return Type::FLOAT; | |
415 } | |
416 } | |
417 | |
418 //============================================================================= | |
419 //------------------------------Ideal------------------------------------------ | |
420 Node *SubDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
421 const Type *t2 = phase->type( in(2) ); | |
422 // Convert "x-c0" into "x+ -c0". | |
423 if( t2->base() == Type::DoubleCon ) { // Might be bottom or top... | |
424 // return new (phase->C, 3) AddDNode(in(1), phase->makecon( TypeD::make(-t2->getd()) ) ); | |
425 } | |
426 | |
427 // Not associative because of boundary conditions (infinity) | |
428 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
429 // Convert "x - (x+y)" into "-y" | |
430 if( in(2)->is_Add() && | |
431 phase->eqv(in(1),in(2)->in(1) ) ) | |
432 return new (phase->C, 3) SubDNode( phase->makecon(TypeD::ZERO),in(2)->in(2)); | |
433 } | |
434 | |
435 // Cannot replace 0.0-X with -X because a 'dsub' bytecode computes | |
436 // 0.0-0.0 as +0.0, while a 'dneg' bytecode computes -0.0. | |
437 //if( phase->type(in(1)) == TypeD::ZERO ) | |
438 //return new (phase->C, 2) NegDNode(in(2)); | |
439 | |
440 return NULL; | |
441 } | |
442 | |
443 //------------------------------sub-------------------------------------------- | |
444 // A subtract node differences its two inputs. | |
445 const Type *SubDNode::sub( const Type *t1, const Type *t2 ) const { | |
446 // no folding if one of operands is infinity or NaN, do not do constant folding | |
447 if( g_isfinite(t1->getd()) && g_isfinite(t2->getd()) ) { | |
448 return TypeD::make( t1->getd() - t2->getd() ); | |
449 } | |
450 else if( g_isnan(t1->getd()) ) { | |
451 return t1; | |
452 } | |
453 else if( g_isnan(t2->getd()) ) { | |
454 return t2; | |
455 } | |
456 else { | |
457 return Type::DOUBLE; | |
458 } | |
459 } | |
460 | |
461 //============================================================================= | |
462 //------------------------------Idealize--------------------------------------- | |
463 // Unlike SubNodes, compare must still flatten return value to the | |
464 // range -1, 0, 1. | |
465 // And optimizations like those for (X + Y) - X fail if overflow happens. | |
466 Node *CmpNode::Identity( PhaseTransform *phase ) { | |
467 return this; | |
468 } | |
469 | |
470 //============================================================================= | |
471 //------------------------------cmp-------------------------------------------- | |
472 // Simplify a CmpI (compare 2 integers) node, based on local information. | |
473 // If both inputs are constants, compare them. | |
474 const Type *CmpINode::sub( const Type *t1, const Type *t2 ) const { | |
475 const TypeInt *r0 = t1->is_int(); // Handy access | |
476 const TypeInt *r1 = t2->is_int(); | |
477 | |
478 if( r0->_hi < r1->_lo ) // Range is always low? | |
479 return TypeInt::CC_LT; | |
480 else if( r0->_lo > r1->_hi ) // Range is always high? | |
481 return TypeInt::CC_GT; | |
482 | |
483 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
484 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
485 return TypeInt::CC_EQ; // Equal results. | |
486 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
487 return TypeInt::CC_LE; | |
488 else if( r0->_lo == r1->_hi ) // Range is never low? | |
489 return TypeInt::CC_GE; | |
490 return TypeInt::CC; // else use worst case results | |
491 } | |
492 | |
493 // Simplify a CmpU (compare 2 integers) node, based on local information. | |
494 // If both inputs are constants, compare them. | |
495 const Type *CmpUNode::sub( const Type *t1, const Type *t2 ) const { | |
496 assert(!t1->isa_ptr(), "obsolete usage of CmpU"); | |
497 | |
498 // comparing two unsigned ints | |
499 const TypeInt *r0 = t1->is_int(); // Handy access | |
500 const TypeInt *r1 = t2->is_int(); | |
501 | |
502 // Current installed version | |
503 // Compare ranges for non-overlap | |
504 juint lo0 = r0->_lo; | |
505 juint hi0 = r0->_hi; | |
506 juint lo1 = r1->_lo; | |
507 juint hi1 = r1->_hi; | |
508 | |
509 // If either one has both negative and positive values, | |
510 // it therefore contains both 0 and -1, and since [0..-1] is the | |
511 // full unsigned range, the type must act as an unsigned bottom. | |
512 bool bot0 = ((jint)(lo0 ^ hi0) < 0); | |
513 bool bot1 = ((jint)(lo1 ^ hi1) < 0); | |
514 | |
515 if (bot0 || bot1) { | |
516 // All unsigned values are LE -1 and GE 0. | |
517 if (lo0 == 0 && hi0 == 0) { | |
518 return TypeInt::CC_LE; // 0 <= bot | |
519 } else if (lo1 == 0 && hi1 == 0) { | |
520 return TypeInt::CC_GE; // bot >= 0 | |
521 } | |
522 } else { | |
523 // We can use ranges of the form [lo..hi] if signs are the same. | |
524 assert(lo0 <= hi0 && lo1 <= hi1, "unsigned ranges are valid"); | |
525 // results are reversed, '-' > '+' for unsigned compare | |
526 if (hi0 < lo1) { | |
527 return TypeInt::CC_LT; // smaller | |
528 } else if (lo0 > hi1) { | |
529 return TypeInt::CC_GT; // greater | |
530 } else if (hi0 == lo1 && lo0 == hi1) { | |
531 return TypeInt::CC_EQ; // Equal results | |
532 } else if (lo0 >= hi1) { | |
533 return TypeInt::CC_GE; | |
534 } else if (hi0 <= lo1) { | |
535 // Check for special case in Hashtable::get. (See below.) | |
536 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && | |
537 in(1)->Opcode() == Op_ModI && | |
538 in(1)->in(2) == in(2) ) | |
539 return TypeInt::CC_LT; | |
540 return TypeInt::CC_LE; | |
541 } | |
542 } | |
543 // Check for special case in Hashtable::get - the hash index is | |
544 // mod'ed to the table size so the following range check is useless. | |
545 // Check for: (X Mod Y) CmpU Y, where the mod result and Y both have | |
546 // to be positive. | |
547 // (This is a gross hack, since the sub method never | |
548 // looks at the structure of the node in any other case.) | |
549 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && | |
550 in(1)->Opcode() == Op_ModI && | |
551 in(1)->in(2)->uncast() == in(2)->uncast()) | |
552 return TypeInt::CC_LT; | |
553 return TypeInt::CC; // else use worst case results | |
554 } | |
555 | |
556 //------------------------------Idealize--------------------------------------- | |
557 Node *CmpINode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
558 if (phase->type(in(2))->higher_equal(TypeInt::ZERO)) { | |
559 switch (in(1)->Opcode()) { | |
560 case Op_CmpL3: // Collapse a CmpL3/CmpI into a CmpL | |
561 return new (phase->C, 3) CmpLNode(in(1)->in(1),in(1)->in(2)); | |
562 case Op_CmpF3: // Collapse a CmpF3/CmpI into a CmpF | |
563 return new (phase->C, 3) CmpFNode(in(1)->in(1),in(1)->in(2)); | |
564 case Op_CmpD3: // Collapse a CmpD3/CmpI into a CmpD | |
565 return new (phase->C, 3) CmpDNode(in(1)->in(1),in(1)->in(2)); | |
566 //case Op_SubI: | |
567 // If (x - y) cannot overflow, then ((x - y) <?> 0) | |
568 // can be turned into (x <?> y). | |
569 // This is handled (with more general cases) by Ideal_sub_algebra. | |
570 } | |
571 } | |
572 return NULL; // No change | |
573 } | |
574 | |
575 | |
576 //============================================================================= | |
577 // Simplify a CmpL (compare 2 longs ) node, based on local information. | |
578 // If both inputs are constants, compare them. | |
579 const Type *CmpLNode::sub( const Type *t1, const Type *t2 ) const { | |
580 const TypeLong *r0 = t1->is_long(); // Handy access | |
581 const TypeLong *r1 = t2->is_long(); | |
582 | |
583 if( r0->_hi < r1->_lo ) // Range is always low? | |
584 return TypeInt::CC_LT; | |
585 else if( r0->_lo > r1->_hi ) // Range is always high? | |
586 return TypeInt::CC_GT; | |
587 | |
588 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
589 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
590 return TypeInt::CC_EQ; // Equal results. | |
591 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
592 return TypeInt::CC_LE; | |
593 else if( r0->_lo == r1->_hi ) // Range is never low? | |
594 return TypeInt::CC_GE; | |
595 return TypeInt::CC; // else use worst case results | |
596 } | |
597 | |
598 //============================================================================= | |
599 //------------------------------sub-------------------------------------------- | |
600 // Simplify an CmpP (compare 2 pointers) node, based on local information. | |
601 // If both inputs are constants, compare them. | |
602 const Type *CmpPNode::sub( const Type *t1, const Type *t2 ) const { | |
603 const TypePtr *r0 = t1->is_ptr(); // Handy access | |
604 const TypePtr *r1 = t2->is_ptr(); | |
605 | |
606 // Undefined inputs makes for an undefined result | |
607 if( TypePtr::above_centerline(r0->_ptr) || | |
608 TypePtr::above_centerline(r1->_ptr) ) | |
609 return Type::TOP; | |
610 | |
611 if (r0 == r1 && r0->singleton()) { | |
612 // Equal pointer constants (klasses, nulls, etc.) | |
613 return TypeInt::CC_EQ; | |
614 } | |
615 | |
616 // See if it is 2 unrelated classes. | |
617 const TypeOopPtr* p0 = r0->isa_oopptr(); | |
618 const TypeOopPtr* p1 = r1->isa_oopptr(); | |
619 if (p0 && p1) { | |
33 | 620 Node* in1 = in(1)->uncast(); |
621 Node* in2 = in(2)->uncast(); | |
622 AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL); | |
623 AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL); | |
624 if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) { | |
625 return TypeInt::CC_GT; // different pointers | |
626 } | |
0 | 627 ciKlass* klass0 = p0->klass(); |
628 bool xklass0 = p0->klass_is_exact(); | |
629 ciKlass* klass1 = p1->klass(); | |
630 bool xklass1 = p1->klass_is_exact(); | |
631 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); | |
632 if (klass0 && klass1 && | |
633 kps != 1 && // both or neither are klass pointers | |
634 !klass0->is_interface() && // do not trust interfaces | |
635 !klass1->is_interface()) { | |
636 // See if neither subclasses the other, or if the class on top | |
637 // is precise. In either of these cases, the compare must fail. | |
638 if (klass0->equals(klass1) || // if types are unequal but klasses are | |
639 !klass0->is_java_klass() || // types not part of Java language? | |
640 !klass1->is_java_klass()) { // types not part of Java language? | |
641 // Do nothing; we know nothing for imprecise types | |
642 } else if (klass0->is_subtype_of(klass1)) { | |
643 // If klass1's type is PRECISE, then we can fail. | |
644 if (xklass1) return TypeInt::CC_GT; | |
645 } else if (klass1->is_subtype_of(klass0)) { | |
646 // If klass0's type is PRECISE, then we can fail. | |
647 if (xklass0) return TypeInt::CC_GT; | |
648 } else { // Neither subtypes the other | |
649 return TypeInt::CC_GT; // ...so always fail | |
650 } | |
651 } | |
652 } | |
653 | |
654 // Known constants can be compared exactly | |
655 // Null can be distinguished from any NotNull pointers | |
656 // Unknown inputs makes an unknown result | |
657 if( r0->singleton() ) { | |
658 intptr_t bits0 = r0->get_con(); | |
659 if( r1->singleton() ) | |
660 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; | |
661 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
662 } else if( r1->singleton() ) { | |
663 intptr_t bits1 = r1->get_con(); | |
664 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
665 } else | |
666 return TypeInt::CC; | |
667 } | |
668 | |
669 //------------------------------Ideal------------------------------------------ | |
670 // Check for the case of comparing an unknown klass loaded from the primary | |
671 // super-type array vs a known klass with no subtypes. This amounts to | |
672 // checking to see an unknown klass subtypes a known klass with no subtypes; | |
673 // this only happens on an exact match. We can shorten this test by 1 load. | |
674 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
675 // Constant pointer on right? | |
676 const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr(); | |
677 if (t2 == NULL || !t2->klass_is_exact()) | |
678 return NULL; | |
679 // Get the constant klass we are comparing to. | |
680 ciKlass* superklass = t2->klass(); | |
681 | |
682 // Now check for LoadKlass on left. | |
683 Node* ldk1 = in(1); | |
684 if (ldk1->Opcode() != Op_LoadKlass) | |
685 return NULL; | |
686 // Take apart the address of the LoadKlass: | |
687 Node* adr1 = ldk1->in(MemNode::Address); | |
688 intptr_t con2 = 0; | |
689 Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2); | |
690 if (ldk2 == NULL) | |
691 return NULL; | |
692 if (con2 == oopDesc::klass_offset_in_bytes()) { | |
693 // We are inspecting an object's concrete class. | |
694 // Short-circuit the check if the query is abstract. | |
695 if (superklass->is_interface() || | |
696 superklass->is_abstract()) { | |
697 // Make it come out always false: | |
698 this->set_req(2, phase->makecon(TypePtr::NULL_PTR)); | |
699 return this; | |
700 } | |
701 } | |
702 | |
703 // Check for a LoadKlass from primary supertype array. | |
704 // Any nested loadklass from loadklass+con must be from the p.s. array. | |
705 if (ldk2->Opcode() != Op_LoadKlass) | |
706 return NULL; | |
707 | |
708 // Verify that we understand the situation | |
709 if (con2 != (intptr_t) superklass->super_check_offset()) | |
710 return NULL; // Might be element-klass loading from array klass | |
711 | |
712 // If 'superklass' has no subklasses and is not an interface, then we are | |
713 // assured that the only input which will pass the type check is | |
714 // 'superklass' itself. | |
715 // | |
716 // We could be more liberal here, and allow the optimization on interfaces | |
717 // which have a single implementor. This would require us to increase the | |
718 // expressiveness of the add_dependency() mechanism. | |
719 // %%% Do this after we fix TypeOopPtr: Deps are expressive enough now. | |
720 | |
721 // Object arrays must have their base element have no subtypes | |
722 while (superklass->is_obj_array_klass()) { | |
723 ciType* elem = superklass->as_obj_array_klass()->element_type(); | |
724 superklass = elem->as_klass(); | |
725 } | |
726 if (superklass->is_instance_klass()) { | |
727 ciInstanceKlass* ik = superklass->as_instance_klass(); | |
728 if (ik->has_subklass() || ik->is_interface()) return NULL; | |
729 // Add a dependency if there is a chance that a subclass will be added later. | |
730 if (!ik->is_final()) { | |
731 phase->C->dependencies()->assert_leaf_type(ik); | |
732 } | |
733 } | |
734 | |
735 // Bypass the dependent load, and compare directly | |
736 this->set_req(1,ldk2); | |
737 | |
738 return this; | |
739 } | |
740 | |
741 //============================================================================= | |
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742 //------------------------------sub-------------------------------------------- |
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743 // Simplify an CmpN (compare 2 pointers) node, based on local information. |
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744 // If both inputs are constants, compare them. |
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745 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const { |
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746 const TypePtr *r0 = t1->make_ptr(); // Handy access |
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747 const TypePtr *r1 = t2->make_ptr(); |
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748 |
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749 // Undefined inputs makes for an undefined result |
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750 if( TypePtr::above_centerline(r0->_ptr) || |
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751 TypePtr::above_centerline(r1->_ptr) ) |
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752 return Type::TOP; |
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753 |
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754 if (r0 == r1 && r0->singleton()) { |
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755 // Equal pointer constants (klasses, nulls, etc.) |
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756 return TypeInt::CC_EQ; |
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757 } |
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758 |
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759 // See if it is 2 unrelated classes. |
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760 const TypeOopPtr* p0 = r0->isa_oopptr(); |
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761 const TypeOopPtr* p1 = r1->isa_oopptr(); |
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762 if (p0 && p1) { |
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763 ciKlass* klass0 = p0->klass(); |
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764 bool xklass0 = p0->klass_is_exact(); |
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765 ciKlass* klass1 = p1->klass(); |
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766 bool xklass1 = p1->klass_is_exact(); |
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767 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); |
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768 if (klass0 && klass1 && |
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769 kps != 1 && // both or neither are klass pointers |
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770 !klass0->is_interface() && // do not trust interfaces |
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771 !klass1->is_interface()) { |
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772 // See if neither subclasses the other, or if the class on top |
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773 // is precise. In either of these cases, the compare must fail. |
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774 if (klass0->equals(klass1) || // if types are unequal but klasses are |
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775 !klass0->is_java_klass() || // types not part of Java language? |
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776 !klass1->is_java_klass()) { // types not part of Java language? |
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777 // Do nothing; we know nothing for imprecise types |
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778 } else if (klass0->is_subtype_of(klass1)) { |
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779 // If klass1's type is PRECISE, then we can fail. |
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780 if (xklass1) return TypeInt::CC_GT; |
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781 } else if (klass1->is_subtype_of(klass0)) { |
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782 // If klass0's type is PRECISE, then we can fail. |
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783 if (xklass0) return TypeInt::CC_GT; |
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784 } else { // Neither subtypes the other |
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785 return TypeInt::CC_GT; // ...so always fail |
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786 } |
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787 } |
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788 } |
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789 |
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790 // Known constants can be compared exactly |
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791 // Null can be distinguished from any NotNull pointers |
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792 // Unknown inputs makes an unknown result |
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793 if( r0->singleton() ) { |
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794 intptr_t bits0 = r0->get_con(); |
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795 if( r1->singleton() ) |
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796 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; |
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797 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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798 } else if( r1->singleton() ) { |
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799 intptr_t bits1 = r1->get_con(); |
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800 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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801 } else |
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802 return TypeInt::CC; |
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803 } |
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804 |
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805 //------------------------------Ideal------------------------------------------ |
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806 Node *CmpNNode::Ideal( PhaseGVN *phase, bool can_reshape ) { |
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807 return NULL; |
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808 } |
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809 |
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810 //============================================================================= |
0 | 811 //------------------------------Value------------------------------------------ |
812 // Simplify an CmpF (compare 2 floats ) node, based on local information. | |
813 // If both inputs are constants, compare them. | |
814 const Type *CmpFNode::Value( PhaseTransform *phase ) const { | |
815 const Node* in1 = in(1); | |
816 const Node* in2 = in(2); | |
817 // Either input is TOP ==> the result is TOP | |
818 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
819 if( t1 == Type::TOP ) return Type::TOP; | |
820 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
821 if( t2 == Type::TOP ) return Type::TOP; | |
822 | |
823 // Not constants? Don't know squat - even if they are the same | |
824 // value! If they are NaN's they compare to LT instead of EQ. | |
825 const TypeF *tf1 = t1->isa_float_constant(); | |
826 const TypeF *tf2 = t2->isa_float_constant(); | |
827 if( !tf1 || !tf2 ) return TypeInt::CC; | |
828 | |
829 // This implements the Java bytecode fcmpl, so unordered returns -1. | |
830 if( tf1->is_nan() || tf2->is_nan() ) | |
831 return TypeInt::CC_LT; | |
832 | |
833 if( tf1->_f < tf2->_f ) return TypeInt::CC_LT; | |
834 if( tf1->_f > tf2->_f ) return TypeInt::CC_GT; | |
835 assert( tf1->_f == tf2->_f, "do not understand FP behavior" ); | |
836 return TypeInt::CC_EQ; | |
837 } | |
838 | |
839 | |
840 //============================================================================= | |
841 //------------------------------Value------------------------------------------ | |
842 // Simplify an CmpD (compare 2 doubles ) node, based on local information. | |
843 // If both inputs are constants, compare them. | |
844 const Type *CmpDNode::Value( PhaseTransform *phase ) const { | |
845 const Node* in1 = in(1); | |
846 const Node* in2 = in(2); | |
847 // Either input is TOP ==> the result is TOP | |
848 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
849 if( t1 == Type::TOP ) return Type::TOP; | |
850 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
851 if( t2 == Type::TOP ) return Type::TOP; | |
852 | |
853 // Not constants? Don't know squat - even if they are the same | |
854 // value! If they are NaN's they compare to LT instead of EQ. | |
855 const TypeD *td1 = t1->isa_double_constant(); | |
856 const TypeD *td2 = t2->isa_double_constant(); | |
857 if( !td1 || !td2 ) return TypeInt::CC; | |
858 | |
859 // This implements the Java bytecode dcmpl, so unordered returns -1. | |
860 if( td1->is_nan() || td2->is_nan() ) | |
861 return TypeInt::CC_LT; | |
862 | |
863 if( td1->_d < td2->_d ) return TypeInt::CC_LT; | |
864 if( td1->_d > td2->_d ) return TypeInt::CC_GT; | |
865 assert( td1->_d == td2->_d, "do not understand FP behavior" ); | |
866 return TypeInt::CC_EQ; | |
867 } | |
868 | |
869 //------------------------------Ideal------------------------------------------ | |
870 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
871 // Check if we can change this to a CmpF and remove a ConvD2F operation. | |
872 // Change (CMPD (F2D (float)) (ConD value)) | |
873 // To (CMPF (float) (ConF value)) | |
874 // Valid when 'value' does not lose precision as a float. | |
875 // Benefits: eliminates conversion, does not require 24-bit mode | |
876 | |
877 // NaNs prevent commuting operands. This transform works regardless of the | |
878 // order of ConD and ConvF2D inputs by preserving the original order. | |
879 int idx_f2d = 1; // ConvF2D on left side? | |
880 if( in(idx_f2d)->Opcode() != Op_ConvF2D ) | |
881 idx_f2d = 2; // No, swap to check for reversed args | |
882 int idx_con = 3-idx_f2d; // Check for the constant on other input | |
883 | |
884 if( ConvertCmpD2CmpF && | |
885 in(idx_f2d)->Opcode() == Op_ConvF2D && | |
886 in(idx_con)->Opcode() == Op_ConD ) { | |
887 const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant(); | |
888 double t2_value_as_double = t2->_d; | |
889 float t2_value_as_float = (float)t2_value_as_double; | |
890 if( t2_value_as_double == (double)t2_value_as_float ) { | |
891 // Test value can be represented as a float | |
892 // Eliminate the conversion to double and create new comparison | |
893 Node *new_in1 = in(idx_f2d)->in(1); | |
894 Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) ); | |
895 if( idx_f2d != 1 ) { // Must flip args to match original order | |
896 Node *tmp = new_in1; | |
897 new_in1 = new_in2; | |
898 new_in2 = tmp; | |
899 } | |
900 CmpFNode *new_cmp = (Opcode() == Op_CmpD3) | |
901 ? new (phase->C, 3) CmpF3Node( new_in1, new_in2 ) | |
902 : new (phase->C, 3) CmpFNode ( new_in1, new_in2 ) ; | |
903 return new_cmp; // Changed to CmpFNode | |
904 } | |
905 // Testing value required the precision of a double | |
906 } | |
907 return NULL; // No change | |
908 } | |
909 | |
910 | |
911 //============================================================================= | |
912 //------------------------------cc2logical------------------------------------- | |
913 // Convert a condition code type to a logical type | |
914 const Type *BoolTest::cc2logical( const Type *CC ) const { | |
915 if( CC == Type::TOP ) return Type::TOP; | |
916 if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse | |
917 const TypeInt *ti = CC->is_int(); | |
918 if( ti->is_con() ) { // Only 1 kind of condition codes set? | |
919 // Match low order 2 bits | |
920 int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0; | |
921 if( _test & 4 ) tmp = 1-tmp; // Optionally complement result | |
922 return TypeInt::make(tmp); // Boolean result | |
923 } | |
924 | |
925 if( CC == TypeInt::CC_GE ) { | |
926 if( _test == ge ) return TypeInt::ONE; | |
927 if( _test == lt ) return TypeInt::ZERO; | |
928 } | |
929 if( CC == TypeInt::CC_LE ) { | |
930 if( _test == le ) return TypeInt::ONE; | |
931 if( _test == gt ) return TypeInt::ZERO; | |
932 } | |
933 | |
934 return TypeInt::BOOL; | |
935 } | |
936 | |
937 //------------------------------dump_spec------------------------------------- | |
938 // Print special per-node info | |
939 #ifndef PRODUCT | |
940 void BoolTest::dump_on(outputStream *st) const { | |
941 const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"}; | |
942 st->print(msg[_test]); | |
943 } | |
944 #endif | |
945 | |
946 //============================================================================= | |
947 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); } | |
948 uint BoolNode::size_of() const { return sizeof(BoolNode); } | |
949 | |
950 //------------------------------operator==------------------------------------- | |
951 uint BoolNode::cmp( const Node &n ) const { | |
952 const BoolNode *b = (const BoolNode *)&n; // Cast up | |
953 return (_test._test == b->_test._test); | |
954 } | |
955 | |
956 //------------------------------clone_cmp-------------------------------------- | |
957 // Clone a compare/bool tree | |
958 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) { | |
959 Node *ncmp = cmp->clone(); | |
960 ncmp->set_req(1,cmp1); | |
961 ncmp->set_req(2,cmp2); | |
962 ncmp = gvn->transform( ncmp ); | |
963 return new (gvn->C, 2) BoolNode( ncmp, test ); | |
964 } | |
965 | |
966 //-------------------------------make_predicate-------------------------------- | |
967 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) { | |
968 if (test_value->is_Con()) return test_value; | |
969 if (test_value->is_Bool()) return test_value; | |
970 Compile* C = phase->C; | |
971 if (test_value->is_CMove() && | |
972 test_value->in(CMoveNode::Condition)->is_Bool()) { | |
973 BoolNode* bol = test_value->in(CMoveNode::Condition)->as_Bool(); | |
974 const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse)); | |
975 const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue)); | |
976 if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) { | |
977 return bol; | |
978 } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) { | |
979 return phase->transform( bol->negate(phase) ); | |
980 } | |
981 // Else fall through. The CMove gets in the way of the test. | |
982 // It should be the case that make_predicate(bol->as_int_value()) == bol. | |
983 } | |
984 Node* cmp = new (C, 3) CmpINode(test_value, phase->intcon(0)); | |
985 cmp = phase->transform(cmp); | |
986 Node* bol = new (C, 2) BoolNode(cmp, BoolTest::ne); | |
987 return phase->transform(bol); | |
988 } | |
989 | |
990 //--------------------------------as_int_value--------------------------------- | |
991 Node* BoolNode::as_int_value(PhaseGVN* phase) { | |
992 // Inverse to make_predicate. The CMove probably boils down to a Conv2B. | |
993 Node* cmov = CMoveNode::make(phase->C, NULL, this, | |
994 phase->intcon(0), phase->intcon(1), | |
995 TypeInt::BOOL); | |
996 return phase->transform(cmov); | |
997 } | |
998 | |
999 //----------------------------------negate------------------------------------- | |
1000 BoolNode* BoolNode::negate(PhaseGVN* phase) { | |
1001 Compile* C = phase->C; | |
1002 return new (C, 2) BoolNode(in(1), _test.negate()); | |
1003 } | |
1004 | |
1005 | |
1006 //------------------------------Ideal------------------------------------------ | |
1007 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1008 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)". | |
1009 // This moves the constant to the right. Helps value-numbering. | |
1010 Node *cmp = in(1); | |
1011 if( !cmp->is_Sub() ) return NULL; | |
1012 int cop = cmp->Opcode(); | |
1013 if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL; | |
1014 Node *cmp1 = cmp->in(1); | |
1015 Node *cmp2 = cmp->in(2); | |
1016 if( !cmp1 ) return NULL; | |
1017 | |
1018 // Constant on left? | |
1019 Node *con = cmp1; | |
1020 uint op2 = cmp2->Opcode(); | |
1021 // Move constants to the right of compare's to canonicalize. | |
1022 // Do not muck with Opaque1 nodes, as this indicates a loop | |
1023 // guard that cannot change shape. | |
1024 if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 && | |
1025 // Because of NaN's, CmpD and CmpF are not commutative | |
1026 cop != Op_CmpD && cop != Op_CmpF && | |
1027 // Protect against swapping inputs to a compare when it is used by a | |
1028 // counted loop exit, which requires maintaining the loop-limit as in(2) | |
1029 !is_counted_loop_exit_test() ) { | |
1030 // Ok, commute the constant to the right of the cmp node. | |
1031 // Clone the Node, getting a new Node of the same class | |
1032 cmp = cmp->clone(); | |
1033 // Swap inputs to the clone | |
1034 cmp->swap_edges(1, 2); | |
1035 cmp = phase->transform( cmp ); | |
1036 return new (phase->C, 2) BoolNode( cmp, _test.commute() ); | |
1037 } | |
1038 | |
1039 // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)". | |
1040 // The XOR-1 is an idiom used to flip the sense of a bool. We flip the | |
1041 // test instead. | |
1042 int cmp1_op = cmp1->Opcode(); | |
1043 const TypeInt* cmp2_type = phase->type(cmp2)->isa_int(); | |
1044 if (cmp2_type == NULL) return NULL; | |
1045 Node* j_xor = cmp1; | |
1046 if( cmp2_type == TypeInt::ZERO && | |
1047 cmp1_op == Op_XorI && | |
1048 j_xor->in(1) != j_xor && // An xor of itself is dead | |
1049 phase->type( j_xor->in(2) ) == TypeInt::ONE && | |
1050 (_test._test == BoolTest::eq || | |
1051 _test._test == BoolTest::ne) ) { | |
1052 Node *ncmp = phase->transform(new (phase->C, 3) CmpINode(j_xor->in(1),cmp2)); | |
1053 return new (phase->C, 2) BoolNode( ncmp, _test.negate() ); | |
1054 } | |
1055 | |
1056 // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)". | |
1057 // This is a standard idiom for branching on a boolean value. | |
1058 Node *c2b = cmp1; | |
1059 if( cmp2_type == TypeInt::ZERO && | |
1060 cmp1_op == Op_Conv2B && | |
1061 (_test._test == BoolTest::eq || | |
1062 _test._test == BoolTest::ne) ) { | |
1063 Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int() | |
1064 ? (Node*)new (phase->C, 3) CmpINode(c2b->in(1),cmp2) | |
1065 : (Node*)new (phase->C, 3) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR)) | |
1066 ); | |
1067 return new (phase->C, 2) BoolNode( ncmp, _test._test ); | |
1068 } | |
1069 | |
1070 // Comparing a SubI against a zero is equal to comparing the SubI | |
1071 // arguments directly. This only works for eq and ne comparisons | |
1072 // due to possible integer overflow. | |
1073 if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) && | |
1074 (cop == Op_CmpI) && | |
1075 (cmp1->Opcode() == Op_SubI) && | |
1076 ( cmp2_type == TypeInt::ZERO ) ) { | |
1077 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(1),cmp1->in(2))); | |
1078 return new (phase->C, 2) BoolNode( ncmp, _test._test ); | |
1079 } | |
1080 | |
1081 // Change (-A vs 0) into (A vs 0) by commuting the test. Disallow in the | |
1082 // most general case because negating 0x80000000 does nothing. Needed for | |
1083 // the CmpF3/SubI/CmpI idiom. | |
1084 if( cop == Op_CmpI && | |
1085 cmp1->Opcode() == Op_SubI && | |
1086 cmp2_type == TypeInt::ZERO && | |
1087 phase->type( cmp1->in(1) ) == TypeInt::ZERO && | |
1088 phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) { | |
1089 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(2),cmp2)); | |
1090 return new (phase->C, 2) BoolNode( ncmp, _test.commute() ); | |
1091 } | |
1092 | |
1093 // The transformation below is not valid for either signed or unsigned | |
1094 // comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE. | |
1095 // This transformation can be resurrected when we are able to | |
1096 // make inferences about the range of values being subtracted from | |
1097 // (or added to) relative to the wraparound point. | |
1098 // | |
1099 // // Remove +/-1's if possible. | |
1100 // // "X <= Y-1" becomes "X < Y" | |
1101 // // "X+1 <= Y" becomes "X < Y" | |
1102 // // "X < Y+1" becomes "X <= Y" | |
1103 // // "X-1 < Y" becomes "X <= Y" | |
1104 // // Do not this to compares off of the counted-loop-end. These guys are | |
1105 // // checking the trip counter and they want to use the post-incremented | |
1106 // // counter. If they use the PRE-incremented counter, then the counter has | |
1107 // // to be incremented in a private block on a loop backedge. | |
1108 // if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd ) | |
1109 // return NULL; | |
1110 // #ifndef PRODUCT | |
1111 // // Do not do this in a wash GVN pass during verification. | |
1112 // // Gets triggered by too many simple optimizations to be bothered with | |
1113 // // re-trying it again and again. | |
1114 // if( !phase->allow_progress() ) return NULL; | |
1115 // #endif | |
1116 // // Not valid for unsigned compare because of corner cases in involving zero. | |
1117 // // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an | |
1118 // // exception in case X is 0 (because 0-1 turns into 4billion unsigned but | |
1119 // // "0 <=u Y" is always true). | |
1120 // if( cmp->Opcode() == Op_CmpU ) return NULL; | |
1121 // int cmp2_op = cmp2->Opcode(); | |
1122 // if( _test._test == BoolTest::le ) { | |
1123 // if( cmp1_op == Op_AddI && | |
1124 // phase->type( cmp1->in(2) ) == TypeInt::ONE ) | |
1125 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt ); | |
1126 // else if( cmp2_op == Op_AddI && | |
1127 // phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 ) | |
1128 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt ); | |
1129 // } else if( _test._test == BoolTest::lt ) { | |
1130 // if( cmp1_op == Op_AddI && | |
1131 // phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 ) | |
1132 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le ); | |
1133 // else if( cmp2_op == Op_AddI && | |
1134 // phase->type( cmp2->in(2) ) == TypeInt::ONE ) | |
1135 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le ); | |
1136 // } | |
1137 | |
1138 return NULL; | |
1139 } | |
1140 | |
1141 //------------------------------Value------------------------------------------ | |
1142 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node, | |
1143 // based on local information. If the input is constant, do it. | |
1144 const Type *BoolNode::Value( PhaseTransform *phase ) const { | |
1145 return _test.cc2logical( phase->type( in(1) ) ); | |
1146 } | |
1147 | |
1148 //------------------------------dump_spec-------------------------------------- | |
1149 // Dump special per-node info | |
1150 #ifndef PRODUCT | |
1151 void BoolNode::dump_spec(outputStream *st) const { | |
1152 st->print("["); | |
1153 _test.dump_on(st); | |
1154 st->print("]"); | |
1155 } | |
1156 #endif | |
1157 | |
1158 //------------------------------is_counted_loop_exit_test-------------------------------------- | |
1159 // Returns true if node is used by a counted loop node. | |
1160 bool BoolNode::is_counted_loop_exit_test() { | |
1161 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { | |
1162 Node* use = fast_out(i); | |
1163 if (use->is_CountedLoopEnd()) { | |
1164 return true; | |
1165 } | |
1166 } | |
1167 return false; | |
1168 } | |
1169 | |
1170 //============================================================================= | |
1171 //------------------------------NegNode---------------------------------------- | |
1172 Node *NegFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1173 if( in(1)->Opcode() == Op_SubF ) | |
1174 return new (phase->C, 3) SubFNode( in(1)->in(2), in(1)->in(1) ); | |
1175 return NULL; | |
1176 } | |
1177 | |
1178 Node *NegDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1179 if( in(1)->Opcode() == Op_SubD ) | |
1180 return new (phase->C, 3) SubDNode( in(1)->in(2), in(1)->in(1) ); | |
1181 return NULL; | |
1182 } | |
1183 | |
1184 | |
1185 //============================================================================= | |
1186 //------------------------------Value------------------------------------------ | |
1187 // Compute sqrt | |
1188 const Type *SqrtDNode::Value( PhaseTransform *phase ) const { | |
1189 const Type *t1 = phase->type( in(1) ); | |
1190 if( t1 == Type::TOP ) return Type::TOP; | |
1191 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1192 double d = t1->getd(); | |
1193 if( d < 0.0 ) return Type::DOUBLE; | |
1194 return TypeD::make( sqrt( d ) ); | |
1195 } | |
1196 | |
1197 //============================================================================= | |
1198 //------------------------------Value------------------------------------------ | |
1199 // Compute cos | |
1200 const Type *CosDNode::Value( PhaseTransform *phase ) const { | |
1201 const Type *t1 = phase->type( in(1) ); | |
1202 if( t1 == Type::TOP ) return Type::TOP; | |
1203 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1204 double d = t1->getd(); | |
1205 if( d < 0.0 ) return Type::DOUBLE; | |
1206 return TypeD::make( SharedRuntime::dcos( d ) ); | |
1207 } | |
1208 | |
1209 //============================================================================= | |
1210 //------------------------------Value------------------------------------------ | |
1211 // Compute sin | |
1212 const Type *SinDNode::Value( PhaseTransform *phase ) const { | |
1213 const Type *t1 = phase->type( in(1) ); | |
1214 if( t1 == Type::TOP ) return Type::TOP; | |
1215 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1216 double d = t1->getd(); | |
1217 if( d < 0.0 ) return Type::DOUBLE; | |
1218 return TypeD::make( SharedRuntime::dsin( d ) ); | |
1219 } | |
1220 | |
1221 //============================================================================= | |
1222 //------------------------------Value------------------------------------------ | |
1223 // Compute tan | |
1224 const Type *TanDNode::Value( PhaseTransform *phase ) const { | |
1225 const Type *t1 = phase->type( in(1) ); | |
1226 if( t1 == Type::TOP ) return Type::TOP; | |
1227 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1228 double d = t1->getd(); | |
1229 if( d < 0.0 ) return Type::DOUBLE; | |
1230 return TypeD::make( SharedRuntime::dtan( d ) ); | |
1231 } | |
1232 | |
1233 //============================================================================= | |
1234 //------------------------------Value------------------------------------------ | |
1235 // Compute log | |
1236 const Type *LogDNode::Value( PhaseTransform *phase ) const { | |
1237 const Type *t1 = phase->type( in(1) ); | |
1238 if( t1 == Type::TOP ) return Type::TOP; | |
1239 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1240 double d = t1->getd(); | |
1241 if( d < 0.0 ) return Type::DOUBLE; | |
1242 return TypeD::make( SharedRuntime::dlog( d ) ); | |
1243 } | |
1244 | |
1245 //============================================================================= | |
1246 //------------------------------Value------------------------------------------ | |
1247 // Compute log10 | |
1248 const Type *Log10DNode::Value( PhaseTransform *phase ) const { | |
1249 const Type *t1 = phase->type( in(1) ); | |
1250 if( t1 == Type::TOP ) return Type::TOP; | |
1251 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1252 double d = t1->getd(); | |
1253 if( d < 0.0 ) return Type::DOUBLE; | |
1254 return TypeD::make( SharedRuntime::dlog10( d ) ); | |
1255 } | |
1256 | |
1257 //============================================================================= | |
1258 //------------------------------Value------------------------------------------ | |
1259 // Compute exp | |
1260 const Type *ExpDNode::Value( PhaseTransform *phase ) const { | |
1261 const Type *t1 = phase->type( in(1) ); | |
1262 if( t1 == Type::TOP ) return Type::TOP; | |
1263 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1264 double d = t1->getd(); | |
1265 if( d < 0.0 ) return Type::DOUBLE; | |
1266 return TypeD::make( SharedRuntime::dexp( d ) ); | |
1267 } | |
1268 | |
1269 | |
1270 //============================================================================= | |
1271 //------------------------------Value------------------------------------------ | |
1272 // Compute pow | |
1273 const Type *PowDNode::Value( PhaseTransform *phase ) const { | |
1274 const Type *t1 = phase->type( in(1) ); | |
1275 if( t1 == Type::TOP ) return Type::TOP; | |
1276 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1277 const Type *t2 = phase->type( in(2) ); | |
1278 if( t2 == Type::TOP ) return Type::TOP; | |
1279 if( t2->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1280 double d1 = t1->getd(); | |
1281 double d2 = t2->getd(); | |
1282 if( d1 < 0.0 ) return Type::DOUBLE; | |
1283 if( d2 < 0.0 ) return Type::DOUBLE; | |
1284 return TypeD::make( SharedRuntime::dpow( d1, d2 ) ); | |
1285 } |