Mercurial > hg > truffle
annotate src/share/vm/opto/addnode.cpp @ 32:4d428c5b4cb3
6667573: Use set_req_X() in AddPNode::Ideal() for Iterative GVN
Summary: set_req_X() puts dependent nodes on IGVN worklist which allows to improve graph and gives more opportunities for EA scalar replacement.
Reviewed-by: jrose, never
author | kvn |
---|---|
date | Thu, 28 Feb 2008 15:40:09 -0800 |
parents | ff5961f4c095 |
children | 8a4ef4e001d3 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2006 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 #include "incls/_precompiled.incl" | |
28 #include "incls/_addnode.cpp.incl" | |
29 | |
30 #define MAXFLOAT ((float)3.40282346638528860e+38) | |
31 | |
32 // Classic Add functionality. This covers all the usual 'add' behaviors for | |
33 // an algebraic ring. Add-integer, add-float, add-double, and binary-or are | |
34 // all inherited from this class. The various identity values are supplied | |
35 // by virtual functions. | |
36 | |
37 | |
38 //============================================================================= | |
39 //------------------------------hash------------------------------------------- | |
40 // Hash function over AddNodes. Needs to be commutative; i.e., I swap | |
41 // (commute) inputs to AddNodes willy-nilly so the hash function must return | |
42 // the same value in the presence of edge swapping. | |
43 uint AddNode::hash() const { | |
44 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); | |
45 } | |
46 | |
47 //------------------------------Identity--------------------------------------- | |
48 // If either input is a constant 0, return the other input. | |
49 Node *AddNode::Identity( PhaseTransform *phase ) { | |
50 const Type *zero = add_id(); // The additive identity | |
51 if( phase->type( in(1) )->higher_equal( zero ) ) return in(2); | |
52 if( phase->type( in(2) )->higher_equal( zero ) ) return in(1); | |
53 return this; | |
54 } | |
55 | |
56 //------------------------------commute---------------------------------------- | |
57 // Commute operands to move loads and constants to the right. | |
58 static bool commute( Node *add, int con_left, int con_right ) { | |
59 Node *in1 = add->in(1); | |
60 Node *in2 = add->in(2); | |
61 | |
62 // Convert "1+x" into "x+1". | |
63 // Right is a constant; leave it | |
64 if( con_right ) return false; | |
65 // Left is a constant; move it right. | |
66 if( con_left ) { | |
67 add->swap_edges(1, 2); | |
68 return true; | |
69 } | |
70 | |
71 // Convert "Load+x" into "x+Load". | |
72 // Now check for loads | |
73 if( in2->is_Load() ) return false; | |
74 // Left is a Load and Right is not; move it right. | |
75 if( in1->is_Load() ) { | |
76 add->swap_edges(1, 2); | |
77 return true; | |
78 } | |
79 | |
80 PhiNode *phi; | |
81 // Check for tight loop increments: Loop-phi of Add of loop-phi | |
82 if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add) | |
83 return false; | |
84 if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){ | |
85 add->swap_edges(1, 2); | |
86 return true; | |
87 } | |
88 | |
89 // Otherwise, sort inputs (commutativity) to help value numbering. | |
90 if( in1->_idx > in2->_idx ) { | |
91 add->swap_edges(1, 2); | |
92 return true; | |
93 } | |
94 return false; | |
95 } | |
96 | |
97 //------------------------------Idealize--------------------------------------- | |
98 // If we get here, we assume we are associative! | |
99 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
100 const Type *t1 = phase->type( in(1) ); | |
101 const Type *t2 = phase->type( in(2) ); | |
102 int con_left = t1->singleton(); | |
103 int con_right = t2->singleton(); | |
104 | |
105 // Check for commutative operation desired | |
106 if( commute(this,con_left,con_right) ) return this; | |
107 | |
108 AddNode *progress = NULL; // Progress flag | |
109 | |
110 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a | |
111 // constant, and the left input is an add of a constant, flatten the | |
112 // expression tree. | |
113 Node *add1 = in(1); | |
114 Node *add2 = in(2); | |
115 int add1_op = add1->Opcode(); | |
116 int this_op = Opcode(); | |
117 if( con_right && t2 != Type::TOP && // Right input is a constant? | |
118 add1_op == this_op ) { // Left input is an Add? | |
119 | |
120 // Type of left _in right input | |
121 const Type *t12 = phase->type( add1->in(2) ); | |
122 if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? | |
123 // Check for rare case of closed data cycle which can happen inside | |
124 // unreachable loops. In these cases the computation is undefined. | |
125 #ifdef ASSERT | |
126 Node *add11 = add1->in(1); | |
127 int add11_op = add11->Opcode(); | |
128 if( (add1 == add1->in(1)) | |
129 || (add11_op == this_op && add11->in(1) == add1) ) { | |
130 assert(false, "dead loop in AddNode::Ideal"); | |
131 } | |
132 #endif | |
133 // The Add of the flattened expression | |
134 Node *x1 = add1->in(1); | |
135 Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 )); | |
136 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
137 if( igvn ) { | |
138 set_req_X(2,x2,igvn); | |
139 set_req_X(1,x1,igvn); | |
140 } else { | |
141 set_req(2,x2); | |
142 set_req(1,x1); | |
143 } | |
144 progress = this; // Made progress | |
145 add1 = in(1); | |
146 add1_op = add1->Opcode(); | |
147 } | |
148 } | |
149 | |
150 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree. | |
151 if( add1_op == this_op && !con_right ) { | |
152 Node *a12 = add1->in(2); | |
153 const Type *t12 = phase->type( a12 ); | |
154 if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) ) { | |
155 add2 = add1->clone(); | |
156 add2->set_req(2, in(2)); | |
157 add2 = phase->transform(add2); | |
158 set_req(1, add2); | |
159 set_req(2, a12); | |
160 progress = this; | |
161 add2 = a12; | |
162 } | |
163 } | |
164 | |
165 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree. | |
166 int add2_op = add2->Opcode(); | |
167 if( add2_op == this_op && !con_left ) { | |
168 Node *a22 = add2->in(2); | |
169 const Type *t22 = phase->type( a22 ); | |
170 if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) ) { | |
171 Node *addx = add2->clone(); | |
172 addx->set_req(1, in(1)); | |
173 addx->set_req(2, add2->in(1)); | |
174 addx = phase->transform(addx); | |
175 set_req(1, addx); | |
176 set_req(2, a22); | |
177 progress = this; | |
178 } | |
179 } | |
180 | |
181 return progress; | |
182 } | |
183 | |
184 //------------------------------Value----------------------------------------- | |
185 // An add node sums it's two _in. If one input is an RSD, we must mixin | |
186 // the other input's symbols. | |
187 const Type *AddNode::Value( PhaseTransform *phase ) const { | |
188 // Either input is TOP ==> the result is TOP | |
189 const Type *t1 = phase->type( in(1) ); | |
190 const Type *t2 = phase->type( in(2) ); | |
191 if( t1 == Type::TOP ) return Type::TOP; | |
192 if( t2 == Type::TOP ) return Type::TOP; | |
193 | |
194 // Either input is BOTTOM ==> the result is the local BOTTOM | |
195 const Type *bot = bottom_type(); | |
196 if( (t1 == bot) || (t2 == bot) || | |
197 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
198 return bot; | |
199 | |
200 // Check for an addition involving the additive identity | |
201 const Type *tadd = add_of_identity( t1, t2 ); | |
202 if( tadd ) return tadd; | |
203 | |
204 return add_ring(t1,t2); // Local flavor of type addition | |
205 } | |
206 | |
207 //------------------------------add_identity----------------------------------- | |
208 // Check for addition of the identity | |
209 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
210 const Type *zero = add_id(); // The additive identity | |
211 if( t1->higher_equal( zero ) ) return t2; | |
212 if( t2->higher_equal( zero ) ) return t1; | |
213 | |
214 return NULL; | |
215 } | |
216 | |
217 | |
218 //============================================================================= | |
219 //------------------------------Idealize--------------------------------------- | |
220 Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
221 int op1 = in(1)->Opcode(); | |
222 int op2 = in(2)->Opcode(); | |
223 // Fold (con1-x)+con2 into (con1+con2)-x | |
224 if( op1 == Op_SubI ) { | |
225 const Type *t_sub1 = phase->type( in(1)->in(1) ); | |
226 const Type *t_2 = phase->type( in(2) ); | |
227 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) | |
228 return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
229 in(1)->in(2) ); | |
230 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" | |
231 if( op2 == Op_SubI ) { | |
232 // Check for dead cycle: d = (a-b)+(c-d) | |
233 assert( in(1)->in(2) != this && in(2)->in(2) != this, | |
234 "dead loop in AddINode::Ideal" ); | |
235 Node *sub = new (phase->C, 3) SubINode(NULL, NULL); | |
236 sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in(1)->in(1), in(2)->in(1) ) )); | |
237 sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in(1)->in(2), in(2)->in(2) ) )); | |
238 return sub; | |
239 } | |
240 } | |
241 | |
242 // Convert "x+(0-y)" into "(x-y)" | |
243 if( op2 == Op_SubI && phase->type(in(2)->in(1)) == TypeInt::ZERO ) | |
244 return new (phase->C, 3) SubINode(in(1), in(2)->in(2) ); | |
245 | |
246 // Convert "(0-y)+x" into "(x-y)" | |
247 if( op1 == Op_SubI && phase->type(in(1)->in(1)) == TypeInt::ZERO ) | |
248 return new (phase->C, 3) SubINode( in(2), in(1)->in(2) ); | |
249 | |
250 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y. | |
251 // Helps with array allocation math constant folding | |
252 // See 4790063: | |
253 // Unrestricted transformation is unsafe for some runtime values of 'x' | |
254 // ( x == 0, z == 1, y == -1 ) fails | |
255 // ( x == -5, z == 1, y == 1 ) fails | |
256 // Transform works for small z and small negative y when the addition | |
257 // (x + (y << z)) does not cross zero. | |
258 // Implement support for negative y and (x >= -(y << z)) | |
259 // Have not observed cases where type information exists to support | |
260 // positive y and (x <= -(y << z)) | |
261 if( op1 == Op_URShiftI && op2 == Op_ConI && | |
262 in(1)->in(2)->Opcode() == Op_ConI ) { | |
263 jint z = phase->type( in(1)->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter | |
264 jint y = phase->type( in(2) )->is_int()->get_con(); | |
265 | |
266 if( z < 5 && -5 < y && y < 0 ) { | |
267 const Type *t_in11 = phase->type(in(1)->in(1)); | |
268 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) { | |
269 Node *a = phase->transform( new (phase->C, 3) AddINode( in(1)->in(1), phase->intcon(y<<z) ) ); | |
270 return new (phase->C, 3) URShiftINode( a, in(1)->in(2) ); | |
271 } | |
272 } | |
273 } | |
274 | |
275 return AddNode::Ideal(phase, can_reshape); | |
276 } | |
277 | |
278 | |
279 //------------------------------Identity--------------------------------------- | |
280 // Fold (x-y)+y OR y+(x-y) into x | |
281 Node *AddINode::Identity( PhaseTransform *phase ) { | |
282 if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) { | |
283 return in(1)->in(1); | |
284 } | |
285 else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) { | |
286 return in(2)->in(1); | |
287 } | |
288 return AddNode::Identity(phase); | |
289 } | |
290 | |
291 | |
292 //------------------------------add_ring--------------------------------------- | |
293 // Supplied function returns the sum of the inputs. Guaranteed never | |
294 // to be passed a TOP or BOTTOM type, these are filtered out by | |
295 // pre-check. | |
296 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const { | |
297 const TypeInt *r0 = t0->is_int(); // Handy access | |
298 const TypeInt *r1 = t1->is_int(); | |
299 int lo = r0->_lo + r1->_lo; | |
300 int hi = r0->_hi + r1->_hi; | |
301 if( !(r0->is_con() && r1->is_con()) ) { | |
302 // Not both constants, compute approximate result | |
303 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
304 lo = min_jint; hi = max_jint; // Underflow on the low side | |
305 } | |
306 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
307 lo = min_jint; hi = max_jint; // Overflow on the high side | |
308 } | |
309 if( lo > hi ) { // Handle overflow | |
310 lo = min_jint; hi = max_jint; | |
311 } | |
312 } else { | |
313 // both constants, compute precise result using 'lo' and 'hi' | |
314 // Semantics define overflow and underflow for integer addition | |
315 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
316 } | |
317 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
318 } | |
319 | |
320 | |
321 //============================================================================= | |
322 //------------------------------Idealize--------------------------------------- | |
323 Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
324 int op1 = in(1)->Opcode(); | |
325 int op2 = in(2)->Opcode(); | |
326 // Fold (con1-x)+con2 into (con1+con2)-x | |
327 if( op1 == Op_SubL ) { | |
328 const Type *t_sub1 = phase->type( in(1)->in(1) ); | |
329 const Type *t_2 = phase->type( in(2) ); | |
330 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) | |
331 return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
332 in(1)->in(2) ); | |
333 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" | |
334 if( op2 == Op_SubL ) { | |
335 // Check for dead cycle: d = (a-b)+(c-d) | |
336 assert( in(1)->in(2) != this && in(2)->in(2) != this, | |
337 "dead loop in AddLNode::Ideal" ); | |
338 Node *sub = new (phase->C, 3) SubLNode(NULL, NULL); | |
339 sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in(1)->in(1), in(2)->in(1) ) )); | |
340 sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in(1)->in(2), in(2)->in(2) ) )); | |
341 return sub; | |
342 } | |
343 } | |
344 | |
345 // Convert "x+(0-y)" into "(x-y)" | |
346 if( op2 == Op_SubL && phase->type(in(2)->in(1)) == TypeLong::ZERO ) | |
347 return new (phase->C, 3) SubLNode(in(1), in(2)->in(2) ); | |
348 | |
349 // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)" | |
350 // into "(X<<1)+Y" and let shift-folding happen. | |
351 if( op2 == Op_AddL && | |
352 in(2)->in(1) == in(1) && | |
353 op1 != Op_ConL && | |
354 0 ) { | |
355 Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in(1),phase->intcon(1))); | |
356 return new (phase->C, 3) AddLNode(shift,in(2)->in(2)); | |
357 } | |
358 | |
359 return AddNode::Ideal(phase, can_reshape); | |
360 } | |
361 | |
362 | |
363 //------------------------------Identity--------------------------------------- | |
364 // Fold (x-y)+y OR y+(x-y) into x | |
365 Node *AddLNode::Identity( PhaseTransform *phase ) { | |
366 if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) { | |
367 return in(1)->in(1); | |
368 } | |
369 else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) { | |
370 return in(2)->in(1); | |
371 } | |
372 return AddNode::Identity(phase); | |
373 } | |
374 | |
375 | |
376 //------------------------------add_ring--------------------------------------- | |
377 // Supplied function returns the sum of the inputs. Guaranteed never | |
378 // to be passed a TOP or BOTTOM type, these are filtered out by | |
379 // pre-check. | |
380 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
381 const TypeLong *r0 = t0->is_long(); // Handy access | |
382 const TypeLong *r1 = t1->is_long(); | |
383 jlong lo = r0->_lo + r1->_lo; | |
384 jlong hi = r0->_hi + r1->_hi; | |
385 if( !(r0->is_con() && r1->is_con()) ) { | |
386 // Not both constants, compute approximate result | |
387 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
388 lo =min_jlong; hi = max_jlong; // Underflow on the low side | |
389 } | |
390 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
391 lo = min_jlong; hi = max_jlong; // Overflow on the high side | |
392 } | |
393 if( lo > hi ) { // Handle overflow | |
394 lo = min_jlong; hi = max_jlong; | |
395 } | |
396 } else { | |
397 // both constants, compute precise result using 'lo' and 'hi' | |
398 // Semantics define overflow and underflow for integer addition | |
399 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
400 } | |
401 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
402 } | |
403 | |
404 | |
405 //============================================================================= | |
406 //------------------------------add_of_identity-------------------------------- | |
407 // Check for addition of the identity | |
408 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
409 // x ADD 0 should return x unless 'x' is a -zero | |
410 // | |
411 // const Type *zero = add_id(); // The additive identity | |
412 // jfloat f1 = t1->getf(); | |
413 // jfloat f2 = t2->getf(); | |
414 // | |
415 // if( t1->higher_equal( zero ) ) return t2; | |
416 // if( t2->higher_equal( zero ) ) return t1; | |
417 | |
418 return NULL; | |
419 } | |
420 | |
421 //------------------------------add_ring--------------------------------------- | |
422 // Supplied function returns the sum of the inputs. | |
423 // This also type-checks the inputs for sanity. Guaranteed never to | |
424 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
425 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const { | |
426 // We must be adding 2 float constants. | |
427 return TypeF::make( t0->getf() + t1->getf() ); | |
428 } | |
429 | |
430 //------------------------------Ideal------------------------------------------ | |
431 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
432 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
433 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
434 } | |
435 | |
436 // Floating point additions are not associative because of boundary conditions (infinity) | |
437 return commute(this, | |
438 phase->type( in(1) )->singleton(), | |
439 phase->type( in(2) )->singleton() ) ? this : NULL; | |
440 } | |
441 | |
442 | |
443 //============================================================================= | |
444 //------------------------------add_of_identity-------------------------------- | |
445 // Check for addition of the identity | |
446 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
447 // x ADD 0 should return x unless 'x' is a -zero | |
448 // | |
449 // const Type *zero = add_id(); // The additive identity | |
450 // jfloat f1 = t1->getf(); | |
451 // jfloat f2 = t2->getf(); | |
452 // | |
453 // if( t1->higher_equal( zero ) ) return t2; | |
454 // if( t2->higher_equal( zero ) ) return t1; | |
455 | |
456 return NULL; | |
457 } | |
458 //------------------------------add_ring--------------------------------------- | |
459 // Supplied function returns the sum of the inputs. | |
460 // This also type-checks the inputs for sanity. Guaranteed never to | |
461 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
462 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const { | |
463 // We must be adding 2 double constants. | |
464 return TypeD::make( t0->getd() + t1->getd() ); | |
465 } | |
466 | |
467 //------------------------------Ideal------------------------------------------ | |
468 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
469 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
470 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
471 } | |
472 | |
473 // Floating point additions are not associative because of boundary conditions (infinity) | |
474 return commute(this, | |
475 phase->type( in(1) )->singleton(), | |
476 phase->type( in(2) )->singleton() ) ? this : NULL; | |
477 } | |
478 | |
479 | |
480 //============================================================================= | |
481 //------------------------------Identity--------------------------------------- | |
482 // If one input is a constant 0, return the other input. | |
483 Node *AddPNode::Identity( PhaseTransform *phase ) { | |
484 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this; | |
485 } | |
486 | |
487 //------------------------------Idealize--------------------------------------- | |
488 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
489 // Bail out if dead inputs | |
490 if( phase->type( in(Address) ) == Type::TOP ) return NULL; | |
491 | |
492 // If the left input is an add of a constant, flatten the expression tree. | |
493 const Node *n = in(Address); | |
494 if (n->is_AddP() && n->in(Base) == in(Base)) { | |
495 const AddPNode *addp = n->as_AddP(); // Left input is an AddP | |
496 assert( !addp->in(Address)->is_AddP() || | |
497 addp->in(Address)->as_AddP() != addp, | |
498 "dead loop in AddPNode::Ideal" ); | |
499 // Type of left input's right input | |
500 const Type *t = phase->type( addp->in(Offset) ); | |
501 if( t == Type::TOP ) return NULL; | |
502 const TypeX *t12 = t->is_intptr_t(); | |
503 if( t12->is_con() ) { // Left input is an add of a constant? | |
504 // If the right input is a constant, combine constants | |
505 const Type *temp_t2 = phase->type( in(Offset) ); | |
506 if( temp_t2 == Type::TOP ) return NULL; | |
507 const TypeX *t2 = temp_t2->is_intptr_t(); | |
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508 Node* address; |
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509 Node* offset; |
0 | 510 if( t2->is_con() ) { |
511 // The Add of the flattened expression | |
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512 address = addp->in(Address); |
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513 offset = phase->MakeConX(t2->get_con() + t12->get_con()); |
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514 } else { |
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515 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) |
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516 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset))); |
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517 offset = addp->in(Offset); |
0 | 518 } |
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519 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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520 if( igvn ) { |
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521 set_req_X(Address,address,igvn); |
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522 set_req_X(Offset,offset,igvn); |
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523 } else { |
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524 set_req(Address,address); |
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525 set_req(Offset,offset); |
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526 } |
0 | 527 return this; |
528 } | |
529 } | |
530 | |
531 // Raw pointers? | |
532 if( in(Base)->bottom_type() == Type::TOP ) { | |
533 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr. | |
534 if (phase->type(in(Address)) == TypePtr::NULL_PTR) { | |
535 Node* offset = in(Offset); | |
536 return new (phase->C, 2) CastX2PNode(offset); | |
537 } | |
538 } | |
539 | |
540 // If the right is an add of a constant, push the offset down. | |
541 // Convert: (ptr + (offset+con)) into (ptr+offset)+con. | |
542 // The idea is to merge array_base+scaled_index groups together, | |
543 // and only have different constant offsets from the same base. | |
544 const Node *add = in(Offset); | |
545 if( add->Opcode() == Op_AddX && add->in(1) != add ) { | |
546 const Type *t22 = phase->type( add->in(2) ); | |
547 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant? | |
548 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1)))); | |
549 set_req(Offset, add->in(2)); | |
550 return this; // Made progress | |
551 } | |
552 } | |
553 | |
554 return NULL; // No progress | |
555 } | |
556 | |
557 //------------------------------bottom_type------------------------------------ | |
558 // Bottom-type is the pointer-type with unknown offset. | |
559 const Type *AddPNode::bottom_type() const { | |
560 if (in(Address) == NULL) return TypePtr::BOTTOM; | |
561 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr(); | |
562 if( !tp ) return Type::TOP; // TOP input means TOP output | |
563 assert( in(Offset)->Opcode() != Op_ConP, "" ); | |
564 const Type *t = in(Offset)->bottom_type(); | |
565 if( t == Type::TOP ) | |
566 return tp->add_offset(Type::OffsetTop); | |
567 const TypeX *tx = t->is_intptr_t(); | |
568 intptr_t txoffset = Type::OffsetBot; | |
569 if (tx->is_con()) { // Left input is an add of a constant? | |
570 txoffset = tx->get_con(); | |
571 if (txoffset != (int)txoffset) | |
572 txoffset = Type::OffsetBot; // oops: add_offset will choke on it | |
573 } | |
574 return tp->add_offset(txoffset); | |
575 } | |
576 | |
577 //------------------------------Value------------------------------------------ | |
578 const Type *AddPNode::Value( PhaseTransform *phase ) const { | |
579 // Either input is TOP ==> the result is TOP | |
580 const Type *t1 = phase->type( in(Address) ); | |
581 const Type *t2 = phase->type( in(Offset) ); | |
582 if( t1 == Type::TOP ) return Type::TOP; | |
583 if( t2 == Type::TOP ) return Type::TOP; | |
584 | |
585 // Left input is a pointer | |
586 const TypePtr *p1 = t1->isa_ptr(); | |
587 // Right input is an int | |
588 const TypeX *p2 = t2->is_intptr_t(); | |
589 // Add 'em | |
590 intptr_t p2offset = Type::OffsetBot; | |
591 if (p2->is_con()) { // Left input is an add of a constant? | |
592 p2offset = p2->get_con(); | |
593 if (p2offset != (int)p2offset) | |
594 p2offset = Type::OffsetBot; // oops: add_offset will choke on it | |
595 } | |
596 return p1->add_offset(p2offset); | |
597 } | |
598 | |
599 //------------------------Ideal_base_and_offset-------------------------------- | |
600 // Split an oop pointer into a base and offset. | |
601 // (The offset might be Type::OffsetBot in the case of an array.) | |
602 // Return the base, or NULL if failure. | |
603 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase, | |
604 // second return value: | |
605 intptr_t& offset) { | |
606 if (ptr->is_AddP()) { | |
607 Node* base = ptr->in(AddPNode::Base); | |
608 Node* addr = ptr->in(AddPNode::Address); | |
609 Node* offs = ptr->in(AddPNode::Offset); | |
610 if (base == addr || base->is_top()) { | |
611 offset = phase->find_intptr_t_con(offs, Type::OffsetBot); | |
612 if (offset != Type::OffsetBot) { | |
613 return addr; | |
614 } | |
615 } | |
616 } | |
617 offset = Type::OffsetBot; | |
618 return NULL; | |
619 } | |
620 | |
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621 //------------------------------unpack_offsets---------------------------------- |
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622 // Collect the AddP offset values into the elements array, giving up |
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623 // if there are more than length. |
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624 int AddPNode::unpack_offsets(Node* elements[], int length) { |
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625 int count = 0; |
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626 Node* addr = this; |
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627 Node* base = addr->in(AddPNode::Base); |
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628 while (addr->is_AddP()) { |
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629 if (addr->in(AddPNode::Base) != base) { |
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630 // give up |
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631 return -1; |
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632 } |
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633 elements[count++] = addr->in(AddPNode::Offset); |
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634 if (count == length) { |
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635 // give up |
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636 return -1; |
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637 } |
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638 addr = addr->in(AddPNode::Address); |
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639 } |
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640 return count; |
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641 } |
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642 |
0 | 643 //------------------------------match_edge------------------------------------- |
644 // Do we Match on this edge index or not? Do not match base pointer edge | |
645 uint AddPNode::match_edge(uint idx) const { | |
646 return idx > Base; | |
647 } | |
648 | |
649 //---------------------------mach_bottom_type---------------------------------- | |
650 // Utility function for use by ADLC. Implements bottom_type for matched AddP. | |
651 const Type *AddPNode::mach_bottom_type( const MachNode* n) { | |
652 Node* base = n->in(Base); | |
653 const Type *t = base->bottom_type(); | |
654 if ( t == Type::TOP ) { | |
655 // an untyped pointer | |
656 return TypeRawPtr::BOTTOM; | |
657 } | |
658 const TypePtr* tp = t->isa_oopptr(); | |
659 if ( tp == NULL ) return t; | |
660 if ( tp->_offset == TypePtr::OffsetBot ) return tp; | |
661 | |
662 // We must carefully add up the various offsets... | |
663 intptr_t offset = 0; | |
664 const TypePtr* tptr = NULL; | |
665 | |
666 uint numopnds = n->num_opnds(); | |
667 uint index = n->oper_input_base(); | |
668 for ( uint i = 1; i < numopnds; i++ ) { | |
669 MachOper *opnd = n->_opnds[i]; | |
670 // Check for any interesting operand info. | |
671 // In particular, check for both memory and non-memory operands. | |
672 // %%%%% Clean this up: use xadd_offset | |
673 int con = opnd->constant(); | |
674 if ( con == TypePtr::OffsetBot ) goto bottom_out; | |
675 offset += con; | |
676 con = opnd->constant_disp(); | |
677 if ( con == TypePtr::OffsetBot ) goto bottom_out; | |
678 offset += con; | |
679 if( opnd->scale() != 0 ) goto bottom_out; | |
680 | |
681 // Check each operand input edge. Find the 1 allowed pointer | |
682 // edge. Other edges must be index edges; track exact constant | |
683 // inputs and otherwise assume the worst. | |
684 for ( uint j = opnd->num_edges(); j > 0; j-- ) { | |
685 Node* edge = n->in(index++); | |
686 const Type* et = edge->bottom_type(); | |
687 const TypeX* eti = et->isa_intptr_t(); | |
688 if ( eti == NULL ) { | |
689 // there must be one pointer among the operands | |
690 guarantee(tptr == NULL, "must be only one pointer operand"); | |
691 tptr = et->isa_oopptr(); | |
692 guarantee(tptr != NULL, "non-int operand must be pointer"); | |
693 continue; | |
694 } | |
695 if ( eti->_hi != eti->_lo ) goto bottom_out; | |
696 offset += eti->_lo; | |
697 } | |
698 } | |
699 guarantee(tptr != NULL, "must be exactly one pointer operand"); | |
700 return tptr->add_offset(offset); | |
701 | |
702 bottom_out: | |
703 return tp->add_offset(TypePtr::OffsetBot); | |
704 } | |
705 | |
706 //============================================================================= | |
707 //------------------------------Identity--------------------------------------- | |
708 Node *OrINode::Identity( PhaseTransform *phase ) { | |
709 // x | x => x | |
710 if (phase->eqv(in(1), in(2))) { | |
711 return in(1); | |
712 } | |
713 | |
714 return AddNode::Identity(phase); | |
715 } | |
716 | |
717 //------------------------------add_ring--------------------------------------- | |
718 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
719 // the logical operations the ring's ADD is really a logical OR function. | |
720 // This also type-checks the inputs for sanity. Guaranteed never to | |
721 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
722 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const { | |
723 const TypeInt *r0 = t0->is_int(); // Handy access | |
724 const TypeInt *r1 = t1->is_int(); | |
725 | |
726 // If both args are bool, can figure out better types | |
727 if ( r0 == TypeInt::BOOL ) { | |
728 if ( r1 == TypeInt::ONE) { | |
729 return TypeInt::ONE; | |
730 } else if ( r1 == TypeInt::BOOL ) { | |
731 return TypeInt::BOOL; | |
732 } | |
733 } else if ( r0 == TypeInt::ONE ) { | |
734 if ( r1 == TypeInt::BOOL ) { | |
735 return TypeInt::ONE; | |
736 } | |
737 } | |
738 | |
739 // If either input is not a constant, just return all integers. | |
740 if( !r0->is_con() || !r1->is_con() ) | |
741 return TypeInt::INT; // Any integer, but still no symbols. | |
742 | |
743 // Otherwise just OR them bits. | |
744 return TypeInt::make( r0->get_con() | r1->get_con() ); | |
745 } | |
746 | |
747 //============================================================================= | |
748 //------------------------------Identity--------------------------------------- | |
749 Node *OrLNode::Identity( PhaseTransform *phase ) { | |
750 // x | x => x | |
751 if (phase->eqv(in(1), in(2))) { | |
752 return in(1); | |
753 } | |
754 | |
755 return AddNode::Identity(phase); | |
756 } | |
757 | |
758 //------------------------------add_ring--------------------------------------- | |
759 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
760 const TypeLong *r0 = t0->is_long(); // Handy access | |
761 const TypeLong *r1 = t1->is_long(); | |
762 | |
763 // If either input is not a constant, just return all integers. | |
764 if( !r0->is_con() || !r1->is_con() ) | |
765 return TypeLong::LONG; // Any integer, but still no symbols. | |
766 | |
767 // Otherwise just OR them bits. | |
768 return TypeLong::make( r0->get_con() | r1->get_con() ); | |
769 } | |
770 | |
771 //============================================================================= | |
772 //------------------------------add_ring--------------------------------------- | |
773 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
774 // the logical operations the ring's ADD is really a logical OR function. | |
775 // This also type-checks the inputs for sanity. Guaranteed never to | |
776 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
777 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const { | |
778 const TypeInt *r0 = t0->is_int(); // Handy access | |
779 const TypeInt *r1 = t1->is_int(); | |
780 | |
781 // Complementing a boolean? | |
782 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE | |
783 || r1 == TypeInt::BOOL)) | |
784 return TypeInt::BOOL; | |
785 | |
786 if( !r0->is_con() || !r1->is_con() ) // Not constants | |
787 return TypeInt::INT; // Any integer, but still no symbols. | |
788 | |
789 // Otherwise just XOR them bits. | |
790 return TypeInt::make( r0->get_con() ^ r1->get_con() ); | |
791 } | |
792 | |
793 //============================================================================= | |
794 //------------------------------add_ring--------------------------------------- | |
795 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
796 const TypeLong *r0 = t0->is_long(); // Handy access | |
797 const TypeLong *r1 = t1->is_long(); | |
798 | |
799 // If either input is not a constant, just return all integers. | |
800 if( !r0->is_con() || !r1->is_con() ) | |
801 return TypeLong::LONG; // Any integer, but still no symbols. | |
802 | |
803 // Otherwise just OR them bits. | |
804 return TypeLong::make( r0->get_con() ^ r1->get_con() ); | |
805 } | |
806 | |
807 //============================================================================= | |
808 //------------------------------add_ring--------------------------------------- | |
809 // Supplied function returns the sum of the inputs. | |
810 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const { | |
811 const TypeInt *r0 = t0->is_int(); // Handy access | |
812 const TypeInt *r1 = t1->is_int(); | |
813 | |
814 // Otherwise just MAX them bits. | |
815 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
816 } | |
817 | |
818 //============================================================================= | |
819 //------------------------------Idealize--------------------------------------- | |
820 // MINs show up in range-check loop limit calculations. Look for | |
821 // "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)" | |
822 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
823 Node *progress = NULL; | |
824 // Force a right-spline graph | |
825 Node *l = in(1); | |
826 Node *r = in(2); | |
827 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) ) | |
828 // to force a right-spline graph for the rest of MinINode::Ideal(). | |
829 if( l->Opcode() == Op_MinI ) { | |
830 assert( l != l->in(1), "dead loop in MinINode::Ideal" ); | |
831 r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r)); | |
832 l = l->in(1); | |
833 set_req(1, l); | |
834 set_req(2, r); | |
835 return this; | |
836 } | |
837 | |
838 // Get left input & constant | |
839 Node *x = l; | |
840 int x_off = 0; | |
841 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant | |
842 x->in(2)->is_Con() ) { | |
843 const Type *t = x->in(2)->bottom_type(); | |
844 if( t == Type::TOP ) return NULL; // No progress | |
845 x_off = t->is_int()->get_con(); | |
846 x = x->in(1); | |
847 } | |
848 | |
849 // Scan a right-spline-tree for MINs | |
850 Node *y = r; | |
851 int y_off = 0; | |
852 // Check final part of MIN tree | |
853 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant | |
854 y->in(2)->is_Con() ) { | |
855 const Type *t = y->in(2)->bottom_type(); | |
856 if( t == Type::TOP ) return NULL; // No progress | |
857 y_off = t->is_int()->get_con(); | |
858 y = y->in(1); | |
859 } | |
860 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) { | |
861 swap_edges(1, 2); | |
862 return this; | |
863 } | |
864 | |
865 | |
866 if( r->Opcode() == Op_MinI ) { | |
867 assert( r != r->in(2), "dead loop in MinINode::Ideal" ); | |
868 y = r->in(1); | |
869 // Check final part of MIN tree | |
870 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant | |
871 y->in(2)->is_Con() ) { | |
872 const Type *t = y->in(2)->bottom_type(); | |
873 if( t == Type::TOP ) return NULL; // No progress | |
874 y_off = t->is_int()->get_con(); | |
875 y = y->in(1); | |
876 } | |
877 | |
878 if( x->_idx > y->_idx ) | |
879 return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2)))); | |
880 | |
881 // See if covers: MIN2(x+c0,MIN2(y+c1,z)) | |
882 if( !phase->eqv(x,y) ) return NULL; | |
883 // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into | |
884 // MIN2(x+c0 or x+c1 which less, z). | |
885 return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2)); | |
886 } else { | |
887 // See if covers: MIN2(x+c0,y+c1) | |
888 if( !phase->eqv(x,y) ) return NULL; | |
889 // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less. | |
890 return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off))); | |
891 } | |
892 | |
893 } | |
894 | |
895 //------------------------------add_ring--------------------------------------- | |
896 // Supplied function returns the sum of the inputs. | |
897 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const { | |
898 const TypeInt *r0 = t0->is_int(); // Handy access | |
899 const TypeInt *r1 = t1->is_int(); | |
900 | |
901 // Otherwise just MIN them bits. | |
902 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
903 } |