Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/addnode.cpp @ 368:36ccc817fca4
6747051: Improve code and implicit null check generation for compressed oops
Summary: Push DecodeN node below the Null check to the non-null path to use the mach node without 0 test.
Reviewed-by: rasbold, never
author | kvn |
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date | Tue, 23 Sep 2008 12:29:06 -0700 |
parents | 2b73d212b1fd |
children | cc80376deb0c |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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 | |
99
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73 if (in2->is_Load()) { |
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74 if (!in1->is_Load()) { |
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75 // already x+Load to return |
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76 return false; |
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77 } |
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78 // both are loads, so fall through to sort inputs by idx |
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79 } else if( in1->is_Load() ) { |
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80 // Left is a Load and Right is not; move it right. |
0 | 81 add->swap_edges(1, 2); |
82 return true; | |
83 } | |
84 | |
85 PhiNode *phi; | |
86 // Check for tight loop increments: Loop-phi of Add of loop-phi | |
87 if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add) | |
88 return false; | |
89 if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){ | |
90 add->swap_edges(1, 2); | |
91 return true; | |
92 } | |
93 | |
94 // Otherwise, sort inputs (commutativity) to help value numbering. | |
95 if( in1->_idx > in2->_idx ) { | |
96 add->swap_edges(1, 2); | |
97 return true; | |
98 } | |
99 return false; | |
100 } | |
101 | |
102 //------------------------------Idealize--------------------------------------- | |
103 // If we get here, we assume we are associative! | |
104 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
105 const Type *t1 = phase->type( in(1) ); | |
106 const Type *t2 = phase->type( in(2) ); | |
107 int con_left = t1->singleton(); | |
108 int con_right = t2->singleton(); | |
109 | |
110 // Check for commutative operation desired | |
111 if( commute(this,con_left,con_right) ) return this; | |
112 | |
113 AddNode *progress = NULL; // Progress flag | |
114 | |
115 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a | |
116 // constant, and the left input is an add of a constant, flatten the | |
117 // expression tree. | |
118 Node *add1 = in(1); | |
119 Node *add2 = in(2); | |
120 int add1_op = add1->Opcode(); | |
121 int this_op = Opcode(); | |
122 if( con_right && t2 != Type::TOP && // Right input is a constant? | |
123 add1_op == this_op ) { // Left input is an Add? | |
124 | |
125 // Type of left _in right input | |
126 const Type *t12 = phase->type( add1->in(2) ); | |
127 if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? | |
128 // Check for rare case of closed data cycle which can happen inside | |
129 // unreachable loops. In these cases the computation is undefined. | |
130 #ifdef ASSERT | |
131 Node *add11 = add1->in(1); | |
132 int add11_op = add11->Opcode(); | |
133 if( (add1 == add1->in(1)) | |
134 || (add11_op == this_op && add11->in(1) == add1) ) { | |
135 assert(false, "dead loop in AddNode::Ideal"); | |
136 } | |
137 #endif | |
138 // The Add of the flattened expression | |
139 Node *x1 = add1->in(1); | |
140 Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 )); | |
141 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
142 if( igvn ) { | |
143 set_req_X(2,x2,igvn); | |
144 set_req_X(1,x1,igvn); | |
145 } else { | |
146 set_req(2,x2); | |
147 set_req(1,x1); | |
148 } | |
149 progress = this; // Made progress | |
150 add1 = in(1); | |
151 add1_op = add1->Opcode(); | |
152 } | |
153 } | |
154 | |
155 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree. | |
156 if( add1_op == this_op && !con_right ) { | |
157 Node *a12 = add1->in(2); | |
158 const Type *t12 = phase->type( a12 ); | |
159 if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) ) { | |
320
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160 assert(add1->in(1) != this, "dead loop in AddNode::Ideal"); |
0 | 161 add2 = add1->clone(); |
162 add2->set_req(2, in(2)); | |
163 add2 = phase->transform(add2); | |
164 set_req(1, add2); | |
165 set_req(2, a12); | |
166 progress = this; | |
167 add2 = a12; | |
168 } | |
169 } | |
170 | |
171 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree. | |
172 int add2_op = add2->Opcode(); | |
173 if( add2_op == this_op && !con_left ) { | |
174 Node *a22 = add2->in(2); | |
175 const Type *t22 = phase->type( a22 ); | |
176 if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) ) { | |
320
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177 assert(add2->in(1) != this, "dead loop in AddNode::Ideal"); |
0 | 178 Node *addx = add2->clone(); |
179 addx->set_req(1, in(1)); | |
180 addx->set_req(2, add2->in(1)); | |
181 addx = phase->transform(addx); | |
182 set_req(1, addx); | |
183 set_req(2, a22); | |
184 progress = this; | |
185 } | |
186 } | |
187 | |
188 return progress; | |
189 } | |
190 | |
191 //------------------------------Value----------------------------------------- | |
192 // An add node sums it's two _in. If one input is an RSD, we must mixin | |
193 // the other input's symbols. | |
194 const Type *AddNode::Value( PhaseTransform *phase ) const { | |
195 // Either input is TOP ==> the result is TOP | |
196 const Type *t1 = phase->type( in(1) ); | |
197 const Type *t2 = phase->type( in(2) ); | |
198 if( t1 == Type::TOP ) return Type::TOP; | |
199 if( t2 == Type::TOP ) return Type::TOP; | |
200 | |
201 // Either input is BOTTOM ==> the result is the local BOTTOM | |
202 const Type *bot = bottom_type(); | |
203 if( (t1 == bot) || (t2 == bot) || | |
204 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
205 return bot; | |
206 | |
207 // Check for an addition involving the additive identity | |
208 const Type *tadd = add_of_identity( t1, t2 ); | |
209 if( tadd ) return tadd; | |
210 | |
211 return add_ring(t1,t2); // Local flavor of type addition | |
212 } | |
213 | |
214 //------------------------------add_identity----------------------------------- | |
215 // Check for addition of the identity | |
216 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
217 const Type *zero = add_id(); // The additive identity | |
218 if( t1->higher_equal( zero ) ) return t2; | |
219 if( t2->higher_equal( zero ) ) return t1; | |
220 | |
221 return NULL; | |
222 } | |
223 | |
224 | |
225 //============================================================================= | |
226 //------------------------------Idealize--------------------------------------- | |
227 Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
228 int op1 = in(1)->Opcode(); | |
229 int op2 = in(2)->Opcode(); | |
230 // Fold (con1-x)+con2 into (con1+con2)-x | |
231 if( op1 == Op_SubI ) { | |
232 const Type *t_sub1 = phase->type( in(1)->in(1) ); | |
233 const Type *t_2 = phase->type( in(2) ); | |
234 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) | |
235 return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
236 in(1)->in(2) ); | |
237 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" | |
238 if( op2 == Op_SubI ) { | |
239 // Check for dead cycle: d = (a-b)+(c-d) | |
240 assert( in(1)->in(2) != this && in(2)->in(2) != this, | |
241 "dead loop in AddINode::Ideal" ); | |
242 Node *sub = new (phase->C, 3) SubINode(NULL, NULL); | |
243 sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in(1)->in(1), in(2)->in(1) ) )); | |
244 sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in(1)->in(2), in(2)->in(2) ) )); | |
245 return sub; | |
246 } | |
247 } | |
248 | |
249 // Convert "x+(0-y)" into "(x-y)" | |
250 if( op2 == Op_SubI && phase->type(in(2)->in(1)) == TypeInt::ZERO ) | |
251 return new (phase->C, 3) SubINode(in(1), in(2)->in(2) ); | |
252 | |
253 // Convert "(0-y)+x" into "(x-y)" | |
254 if( op1 == Op_SubI && phase->type(in(1)->in(1)) == TypeInt::ZERO ) | |
255 return new (phase->C, 3) SubINode( in(2), in(1)->in(2) ); | |
256 | |
257 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y. | |
258 // Helps with array allocation math constant folding | |
259 // See 4790063: | |
260 // Unrestricted transformation is unsafe for some runtime values of 'x' | |
261 // ( x == 0, z == 1, y == -1 ) fails | |
262 // ( x == -5, z == 1, y == 1 ) fails | |
263 // Transform works for small z and small negative y when the addition | |
264 // (x + (y << z)) does not cross zero. | |
265 // Implement support for negative y and (x >= -(y << z)) | |
266 // Have not observed cases where type information exists to support | |
267 // positive y and (x <= -(y << z)) | |
268 if( op1 == Op_URShiftI && op2 == Op_ConI && | |
269 in(1)->in(2)->Opcode() == Op_ConI ) { | |
270 jint z = phase->type( in(1)->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter | |
271 jint y = phase->type( in(2) )->is_int()->get_con(); | |
272 | |
273 if( z < 5 && -5 < y && y < 0 ) { | |
274 const Type *t_in11 = phase->type(in(1)->in(1)); | |
275 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) { | |
276 Node *a = phase->transform( new (phase->C, 3) AddINode( in(1)->in(1), phase->intcon(y<<z) ) ); | |
277 return new (phase->C, 3) URShiftINode( a, in(1)->in(2) ); | |
278 } | |
279 } | |
280 } | |
281 | |
282 return AddNode::Ideal(phase, can_reshape); | |
283 } | |
284 | |
285 | |
286 //------------------------------Identity--------------------------------------- | |
287 // Fold (x-y)+y OR y+(x-y) into x | |
288 Node *AddINode::Identity( PhaseTransform *phase ) { | |
289 if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) { | |
290 return in(1)->in(1); | |
291 } | |
292 else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) { | |
293 return in(2)->in(1); | |
294 } | |
295 return AddNode::Identity(phase); | |
296 } | |
297 | |
298 | |
299 //------------------------------add_ring--------------------------------------- | |
300 // Supplied function returns the sum of the inputs. Guaranteed never | |
301 // to be passed a TOP or BOTTOM type, these are filtered out by | |
302 // pre-check. | |
303 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const { | |
304 const TypeInt *r0 = t0->is_int(); // Handy access | |
305 const TypeInt *r1 = t1->is_int(); | |
306 int lo = r0->_lo + r1->_lo; | |
307 int hi = r0->_hi + r1->_hi; | |
308 if( !(r0->is_con() && r1->is_con()) ) { | |
309 // Not both constants, compute approximate result | |
310 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
311 lo = min_jint; hi = max_jint; // Underflow on the low side | |
312 } | |
313 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
314 lo = min_jint; hi = max_jint; // Overflow on the high side | |
315 } | |
316 if( lo > hi ) { // Handle overflow | |
317 lo = min_jint; hi = max_jint; | |
318 } | |
319 } else { | |
320 // both constants, compute precise result using 'lo' and 'hi' | |
321 // Semantics define overflow and underflow for integer addition | |
322 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
323 } | |
324 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
325 } | |
326 | |
327 | |
328 //============================================================================= | |
329 //------------------------------Idealize--------------------------------------- | |
330 Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
331 int op1 = in(1)->Opcode(); | |
332 int op2 = in(2)->Opcode(); | |
333 // Fold (con1-x)+con2 into (con1+con2)-x | |
334 if( op1 == Op_SubL ) { | |
335 const Type *t_sub1 = phase->type( in(1)->in(1) ); | |
336 const Type *t_2 = phase->type( in(2) ); | |
337 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) | |
338 return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
339 in(1)->in(2) ); | |
340 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" | |
341 if( op2 == Op_SubL ) { | |
342 // Check for dead cycle: d = (a-b)+(c-d) | |
343 assert( in(1)->in(2) != this && in(2)->in(2) != this, | |
344 "dead loop in AddLNode::Ideal" ); | |
345 Node *sub = new (phase->C, 3) SubLNode(NULL, NULL); | |
346 sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in(1)->in(1), in(2)->in(1) ) )); | |
347 sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in(1)->in(2), in(2)->in(2) ) )); | |
348 return sub; | |
349 } | |
350 } | |
351 | |
352 // Convert "x+(0-y)" into "(x-y)" | |
353 if( op2 == Op_SubL && phase->type(in(2)->in(1)) == TypeLong::ZERO ) | |
354 return new (phase->C, 3) SubLNode(in(1), in(2)->in(2) ); | |
355 | |
356 // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)" | |
357 // into "(X<<1)+Y" and let shift-folding happen. | |
358 if( op2 == Op_AddL && | |
359 in(2)->in(1) == in(1) && | |
360 op1 != Op_ConL && | |
361 0 ) { | |
362 Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in(1),phase->intcon(1))); | |
363 return new (phase->C, 3) AddLNode(shift,in(2)->in(2)); | |
364 } | |
365 | |
366 return AddNode::Ideal(phase, can_reshape); | |
367 } | |
368 | |
369 | |
370 //------------------------------Identity--------------------------------------- | |
371 // Fold (x-y)+y OR y+(x-y) into x | |
372 Node *AddLNode::Identity( PhaseTransform *phase ) { | |
373 if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) { | |
374 return in(1)->in(1); | |
375 } | |
376 else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) { | |
377 return in(2)->in(1); | |
378 } | |
379 return AddNode::Identity(phase); | |
380 } | |
381 | |
382 | |
383 //------------------------------add_ring--------------------------------------- | |
384 // Supplied function returns the sum of the inputs. Guaranteed never | |
385 // to be passed a TOP or BOTTOM type, these are filtered out by | |
386 // pre-check. | |
387 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
388 const TypeLong *r0 = t0->is_long(); // Handy access | |
389 const TypeLong *r1 = t1->is_long(); | |
390 jlong lo = r0->_lo + r1->_lo; | |
391 jlong hi = r0->_hi + r1->_hi; | |
392 if( !(r0->is_con() && r1->is_con()) ) { | |
393 // Not both constants, compute approximate result | |
394 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
395 lo =min_jlong; hi = max_jlong; // Underflow on the low side | |
396 } | |
397 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
398 lo = min_jlong; hi = max_jlong; // Overflow on the high side | |
399 } | |
400 if( lo > hi ) { // Handle overflow | |
401 lo = min_jlong; hi = max_jlong; | |
402 } | |
403 } else { | |
404 // both constants, compute precise result using 'lo' and 'hi' | |
405 // Semantics define overflow and underflow for integer addition | |
406 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
407 } | |
408 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
409 } | |
410 | |
411 | |
412 //============================================================================= | |
413 //------------------------------add_of_identity-------------------------------- | |
414 // Check for addition of the identity | |
415 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
416 // x ADD 0 should return x unless 'x' is a -zero | |
417 // | |
418 // const Type *zero = add_id(); // The additive identity | |
419 // jfloat f1 = t1->getf(); | |
420 // jfloat f2 = t2->getf(); | |
421 // | |
422 // if( t1->higher_equal( zero ) ) return t2; | |
423 // if( t2->higher_equal( zero ) ) return t1; | |
424 | |
425 return NULL; | |
426 } | |
427 | |
428 //------------------------------add_ring--------------------------------------- | |
429 // Supplied function returns the sum of the inputs. | |
430 // This also type-checks the inputs for sanity. Guaranteed never to | |
431 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
432 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const { | |
433 // We must be adding 2 float constants. | |
434 return TypeF::make( t0->getf() + t1->getf() ); | |
435 } | |
436 | |
437 //------------------------------Ideal------------------------------------------ | |
438 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
439 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
440 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
441 } | |
442 | |
443 // Floating point additions are not associative because of boundary conditions (infinity) | |
444 return commute(this, | |
445 phase->type( in(1) )->singleton(), | |
446 phase->type( in(2) )->singleton() ) ? this : NULL; | |
447 } | |
448 | |
449 | |
450 //============================================================================= | |
451 //------------------------------add_of_identity-------------------------------- | |
452 // Check for addition of the identity | |
453 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
454 // x ADD 0 should return x unless 'x' is a -zero | |
455 // | |
456 // const Type *zero = add_id(); // The additive identity | |
457 // jfloat f1 = t1->getf(); | |
458 // jfloat f2 = t2->getf(); | |
459 // | |
460 // if( t1->higher_equal( zero ) ) return t2; | |
461 // if( t2->higher_equal( zero ) ) return t1; | |
462 | |
463 return NULL; | |
464 } | |
465 //------------------------------add_ring--------------------------------------- | |
466 // Supplied function returns the sum of the inputs. | |
467 // This also type-checks the inputs for sanity. Guaranteed never to | |
468 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
469 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const { | |
470 // We must be adding 2 double constants. | |
471 return TypeD::make( t0->getd() + t1->getd() ); | |
472 } | |
473 | |
474 //------------------------------Ideal------------------------------------------ | |
475 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
476 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
477 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
478 } | |
479 | |
480 // Floating point additions are not associative because of boundary conditions (infinity) | |
481 return commute(this, | |
482 phase->type( in(1) )->singleton(), | |
483 phase->type( in(2) )->singleton() ) ? this : NULL; | |
484 } | |
485 | |
486 | |
487 //============================================================================= | |
488 //------------------------------Identity--------------------------------------- | |
489 // If one input is a constant 0, return the other input. | |
490 Node *AddPNode::Identity( PhaseTransform *phase ) { | |
491 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this; | |
492 } | |
493 | |
494 //------------------------------Idealize--------------------------------------- | |
495 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
496 // Bail out if dead inputs | |
497 if( phase->type( in(Address) ) == Type::TOP ) return NULL; | |
498 | |
499 // If the left input is an add of a constant, flatten the expression tree. | |
500 const Node *n = in(Address); | |
501 if (n->is_AddP() && n->in(Base) == in(Base)) { | |
502 const AddPNode *addp = n->as_AddP(); // Left input is an AddP | |
503 assert( !addp->in(Address)->is_AddP() || | |
504 addp->in(Address)->as_AddP() != addp, | |
505 "dead loop in AddPNode::Ideal" ); | |
506 // Type of left input's right input | |
507 const Type *t = phase->type( addp->in(Offset) ); | |
508 if( t == Type::TOP ) return NULL; | |
509 const TypeX *t12 = t->is_intptr_t(); | |
510 if( t12->is_con() ) { // Left input is an add of a constant? | |
511 // If the right input is a constant, combine constants | |
512 const Type *temp_t2 = phase->type( in(Offset) ); | |
513 if( temp_t2 == Type::TOP ) return NULL; | |
514 const TypeX *t2 = temp_t2->is_intptr_t(); | |
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515 Node* address; |
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516 Node* offset; |
0 | 517 if( t2->is_con() ) { |
518 // The Add of the flattened expression | |
32
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519 address = addp->in(Address); |
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520 offset = phase->MakeConX(t2->get_con() + t12->get_con()); |
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521 } else { |
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522 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) |
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523 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset))); |
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524 offset = addp->in(Offset); |
0 | 525 } |
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526 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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527 if( igvn ) { |
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528 set_req_X(Address,address,igvn); |
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529 set_req_X(Offset,offset,igvn); |
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530 } else { |
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531 set_req(Address,address); |
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532 set_req(Offset,offset); |
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533 } |
0 | 534 return this; |
535 } | |
536 } | |
537 | |
538 // Raw pointers? | |
539 if( in(Base)->bottom_type() == Type::TOP ) { | |
540 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr. | |
541 if (phase->type(in(Address)) == TypePtr::NULL_PTR) { | |
542 Node* offset = in(Offset); | |
543 return new (phase->C, 2) CastX2PNode(offset); | |
544 } | |
545 } | |
546 | |
547 // If the right is an add of a constant, push the offset down. | |
548 // Convert: (ptr + (offset+con)) into (ptr+offset)+con. | |
549 // The idea is to merge array_base+scaled_index groups together, | |
550 // and only have different constant offsets from the same base. | |
551 const Node *add = in(Offset); | |
552 if( add->Opcode() == Op_AddX && add->in(1) != add ) { | |
553 const Type *t22 = phase->type( add->in(2) ); | |
554 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant? | |
555 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1)))); | |
556 set_req(Offset, add->in(2)); | |
557 return this; // Made progress | |
558 } | |
559 } | |
560 | |
561 return NULL; // No progress | |
562 } | |
563 | |
564 //------------------------------bottom_type------------------------------------ | |
565 // Bottom-type is the pointer-type with unknown offset. | |
566 const Type *AddPNode::bottom_type() const { | |
567 if (in(Address) == NULL) return TypePtr::BOTTOM; | |
568 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr(); | |
569 if( !tp ) return Type::TOP; // TOP input means TOP output | |
570 assert( in(Offset)->Opcode() != Op_ConP, "" ); | |
571 const Type *t = in(Offset)->bottom_type(); | |
572 if( t == Type::TOP ) | |
573 return tp->add_offset(Type::OffsetTop); | |
574 const TypeX *tx = t->is_intptr_t(); | |
575 intptr_t txoffset = Type::OffsetBot; | |
576 if (tx->is_con()) { // Left input is an add of a constant? | |
577 txoffset = tx->get_con(); | |
578 } | |
579 return tp->add_offset(txoffset); | |
580 } | |
581 | |
582 //------------------------------Value------------------------------------------ | |
583 const Type *AddPNode::Value( PhaseTransform *phase ) const { | |
584 // Either input is TOP ==> the result is TOP | |
585 const Type *t1 = phase->type( in(Address) ); | |
586 const Type *t2 = phase->type( in(Offset) ); | |
587 if( t1 == Type::TOP ) return Type::TOP; | |
588 if( t2 == Type::TOP ) return Type::TOP; | |
589 | |
590 // Left input is a pointer | |
591 const TypePtr *p1 = t1->isa_ptr(); | |
592 // Right input is an int | |
593 const TypeX *p2 = t2->is_intptr_t(); | |
594 // Add 'em | |
595 intptr_t p2offset = Type::OffsetBot; | |
596 if (p2->is_con()) { // Left input is an add of a constant? | |
597 p2offset = p2->get_con(); | |
598 } | |
599 return p1->add_offset(p2offset); | |
600 } | |
601 | |
602 //------------------------Ideal_base_and_offset-------------------------------- | |
603 // Split an oop pointer into a base and offset. | |
604 // (The offset might be Type::OffsetBot in the case of an array.) | |
605 // Return the base, or NULL if failure. | |
606 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase, | |
607 // second return value: | |
608 intptr_t& offset) { | |
609 if (ptr->is_AddP()) { | |
610 Node* base = ptr->in(AddPNode::Base); | |
611 Node* addr = ptr->in(AddPNode::Address); | |
612 Node* offs = ptr->in(AddPNode::Offset); | |
613 if (base == addr || base->is_top()) { | |
614 offset = phase->find_intptr_t_con(offs, Type::OffsetBot); | |
615 if (offset != Type::OffsetBot) { | |
616 return addr; | |
617 } | |
618 } | |
619 } | |
620 offset = Type::OffsetBot; | |
621 return NULL; | |
622 } | |
623 | |
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624 //------------------------------unpack_offsets---------------------------------- |
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625 // Collect the AddP offset values into the elements array, giving up |
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626 // if there are more than length. |
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627 int AddPNode::unpack_offsets(Node* elements[], int length) { |
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628 int count = 0; |
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629 Node* addr = this; |
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630 Node* base = addr->in(AddPNode::Base); |
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631 while (addr->is_AddP()) { |
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632 if (addr->in(AddPNode::Base) != base) { |
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633 // give up |
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634 return -1; |
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635 } |
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636 elements[count++] = addr->in(AddPNode::Offset); |
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637 if (count == length) { |
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638 // give up |
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639 return -1; |
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640 } |
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641 addr = addr->in(AddPNode::Address); |
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642 } |
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643 return count; |
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644 } |
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645 |
0 | 646 //------------------------------match_edge------------------------------------- |
647 // Do we Match on this edge index or not? Do not match base pointer edge | |
648 uint AddPNode::match_edge(uint idx) const { | |
649 return idx > Base; | |
650 } | |
651 | |
652 //---------------------------mach_bottom_type---------------------------------- | |
653 // Utility function for use by ADLC. Implements bottom_type for matched AddP. | |
654 const Type *AddPNode::mach_bottom_type( const MachNode* n) { | |
655 Node* base = n->in(Base); | |
656 const Type *t = base->bottom_type(); | |
657 if ( t == Type::TOP ) { | |
658 // an untyped pointer | |
659 return TypeRawPtr::BOTTOM; | |
660 } | |
661 const TypePtr* tp = t->isa_oopptr(); | |
662 if ( tp == NULL ) return t; | |
663 if ( tp->_offset == TypePtr::OffsetBot ) return tp; | |
664 | |
665 // We must carefully add up the various offsets... | |
666 intptr_t offset = 0; | |
667 const TypePtr* tptr = NULL; | |
668 | |
669 uint numopnds = n->num_opnds(); | |
670 uint index = n->oper_input_base(); | |
671 for ( uint i = 1; i < numopnds; i++ ) { | |
672 MachOper *opnd = n->_opnds[i]; | |
673 // Check for any interesting operand info. | |
674 // In particular, check for both memory and non-memory operands. | |
675 // %%%%% Clean this up: use xadd_offset | |
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676 intptr_t con = opnd->constant(); |
0 | 677 if ( con == TypePtr::OffsetBot ) goto bottom_out; |
678 offset += con; | |
679 con = opnd->constant_disp(); | |
680 if ( con == TypePtr::OffsetBot ) goto bottom_out; | |
681 offset += con; | |
682 if( opnd->scale() != 0 ) goto bottom_out; | |
683 | |
684 // Check each operand input edge. Find the 1 allowed pointer | |
685 // edge. Other edges must be index edges; track exact constant | |
686 // inputs and otherwise assume the worst. | |
687 for ( uint j = opnd->num_edges(); j > 0; j-- ) { | |
688 Node* edge = n->in(index++); | |
689 const Type* et = edge->bottom_type(); | |
690 const TypeX* eti = et->isa_intptr_t(); | |
691 if ( eti == NULL ) { | |
692 // there must be one pointer among the operands | |
693 guarantee(tptr == NULL, "must be only one pointer operand"); | |
694 tptr = et->isa_oopptr(); | |
695 guarantee(tptr != NULL, "non-int operand must be pointer"); | |
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696 if (tptr->higher_equal(tp->add_offset(tptr->offset()))) |
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697 tp = tptr; // Set more precise type for bailout |
0 | 698 continue; |
699 } | |
700 if ( eti->_hi != eti->_lo ) goto bottom_out; | |
701 offset += eti->_lo; | |
702 } | |
703 } | |
704 guarantee(tptr != NULL, "must be exactly one pointer operand"); | |
705 return tptr->add_offset(offset); | |
706 | |
707 bottom_out: | |
708 return tp->add_offset(TypePtr::OffsetBot); | |
709 } | |
710 | |
711 //============================================================================= | |
712 //------------------------------Identity--------------------------------------- | |
713 Node *OrINode::Identity( PhaseTransform *phase ) { | |
714 // x | x => x | |
715 if (phase->eqv(in(1), in(2))) { | |
716 return in(1); | |
717 } | |
718 | |
719 return AddNode::Identity(phase); | |
720 } | |
721 | |
722 //------------------------------add_ring--------------------------------------- | |
723 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
724 // the logical operations the ring's ADD is really a logical OR function. | |
725 // This also type-checks the inputs for sanity. Guaranteed never to | |
726 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
727 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const { | |
728 const TypeInt *r0 = t0->is_int(); // Handy access | |
729 const TypeInt *r1 = t1->is_int(); | |
730 | |
731 // If both args are bool, can figure out better types | |
732 if ( r0 == TypeInt::BOOL ) { | |
733 if ( r1 == TypeInt::ONE) { | |
734 return TypeInt::ONE; | |
735 } else if ( r1 == TypeInt::BOOL ) { | |
736 return TypeInt::BOOL; | |
737 } | |
738 } else if ( r0 == TypeInt::ONE ) { | |
739 if ( r1 == TypeInt::BOOL ) { | |
740 return TypeInt::ONE; | |
741 } | |
742 } | |
743 | |
744 // If either input is not a constant, just return all integers. | |
745 if( !r0->is_con() || !r1->is_con() ) | |
746 return TypeInt::INT; // Any integer, but still no symbols. | |
747 | |
748 // Otherwise just OR them bits. | |
749 return TypeInt::make( r0->get_con() | r1->get_con() ); | |
750 } | |
751 | |
752 //============================================================================= | |
753 //------------------------------Identity--------------------------------------- | |
754 Node *OrLNode::Identity( PhaseTransform *phase ) { | |
755 // x | x => x | |
756 if (phase->eqv(in(1), in(2))) { | |
757 return in(1); | |
758 } | |
759 | |
760 return AddNode::Identity(phase); | |
761 } | |
762 | |
763 //------------------------------add_ring--------------------------------------- | |
764 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
765 const TypeLong *r0 = t0->is_long(); // Handy access | |
766 const TypeLong *r1 = t1->is_long(); | |
767 | |
768 // If either input is not a constant, just return all integers. | |
769 if( !r0->is_con() || !r1->is_con() ) | |
770 return TypeLong::LONG; // Any integer, but still no symbols. | |
771 | |
772 // Otherwise just OR them bits. | |
773 return TypeLong::make( r0->get_con() | r1->get_con() ); | |
774 } | |
775 | |
776 //============================================================================= | |
777 //------------------------------add_ring--------------------------------------- | |
778 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
779 // the logical operations the ring's ADD is really a logical OR function. | |
780 // This also type-checks the inputs for sanity. Guaranteed never to | |
781 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
782 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const { | |
783 const TypeInt *r0 = t0->is_int(); // Handy access | |
784 const TypeInt *r1 = t1->is_int(); | |
785 | |
786 // Complementing a boolean? | |
787 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE | |
788 || r1 == TypeInt::BOOL)) | |
789 return TypeInt::BOOL; | |
790 | |
791 if( !r0->is_con() || !r1->is_con() ) // Not constants | |
792 return TypeInt::INT; // Any integer, but still no symbols. | |
793 | |
794 // Otherwise just XOR them bits. | |
795 return TypeInt::make( r0->get_con() ^ r1->get_con() ); | |
796 } | |
797 | |
798 //============================================================================= | |
799 //------------------------------add_ring--------------------------------------- | |
800 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
801 const TypeLong *r0 = t0->is_long(); // Handy access | |
802 const TypeLong *r1 = t1->is_long(); | |
803 | |
804 // If either input is not a constant, just return all integers. | |
805 if( !r0->is_con() || !r1->is_con() ) | |
806 return TypeLong::LONG; // Any integer, but still no symbols. | |
807 | |
808 // Otherwise just OR them bits. | |
809 return TypeLong::make( r0->get_con() ^ r1->get_con() ); | |
810 } | |
811 | |
812 //============================================================================= | |
813 //------------------------------add_ring--------------------------------------- | |
814 // Supplied function returns the sum of the inputs. | |
815 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const { | |
816 const TypeInt *r0 = t0->is_int(); // Handy access | |
817 const TypeInt *r1 = t1->is_int(); | |
818 | |
819 // Otherwise just MAX them bits. | |
820 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
821 } | |
822 | |
823 //============================================================================= | |
824 //------------------------------Idealize--------------------------------------- | |
825 // MINs show up in range-check loop limit calculations. Look for | |
826 // "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)" | |
827 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
828 Node *progress = NULL; | |
829 // Force a right-spline graph | |
830 Node *l = in(1); | |
831 Node *r = in(2); | |
832 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) ) | |
833 // to force a right-spline graph for the rest of MinINode::Ideal(). | |
834 if( l->Opcode() == Op_MinI ) { | |
835 assert( l != l->in(1), "dead loop in MinINode::Ideal" ); | |
836 r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r)); | |
837 l = l->in(1); | |
838 set_req(1, l); | |
839 set_req(2, r); | |
840 return this; | |
841 } | |
842 | |
843 // Get left input & constant | |
844 Node *x = l; | |
845 int x_off = 0; | |
846 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant | |
847 x->in(2)->is_Con() ) { | |
848 const Type *t = x->in(2)->bottom_type(); | |
849 if( t == Type::TOP ) return NULL; // No progress | |
850 x_off = t->is_int()->get_con(); | |
851 x = x->in(1); | |
852 } | |
853 | |
854 // Scan a right-spline-tree for MINs | |
855 Node *y = r; | |
856 int y_off = 0; | |
857 // Check final part of MIN tree | |
858 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant | |
859 y->in(2)->is_Con() ) { | |
860 const Type *t = y->in(2)->bottom_type(); | |
861 if( t == Type::TOP ) return NULL; // No progress | |
862 y_off = t->is_int()->get_con(); | |
863 y = y->in(1); | |
864 } | |
865 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) { | |
866 swap_edges(1, 2); | |
867 return this; | |
868 } | |
869 | |
870 | |
871 if( r->Opcode() == Op_MinI ) { | |
872 assert( r != r->in(2), "dead loop in MinINode::Ideal" ); | |
873 y = r->in(1); | |
874 // Check final part of MIN tree | |
875 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant | |
876 y->in(2)->is_Con() ) { | |
877 const Type *t = y->in(2)->bottom_type(); | |
878 if( t == Type::TOP ) return NULL; // No progress | |
879 y_off = t->is_int()->get_con(); | |
880 y = y->in(1); | |
881 } | |
882 | |
883 if( x->_idx > y->_idx ) | |
884 return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2)))); | |
885 | |
886 // See if covers: MIN2(x+c0,MIN2(y+c1,z)) | |
887 if( !phase->eqv(x,y) ) return NULL; | |
888 // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into | |
889 // MIN2(x+c0 or x+c1 which less, z). | |
890 return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2)); | |
891 } else { | |
892 // See if covers: MIN2(x+c0,y+c1) | |
893 if( !phase->eqv(x,y) ) return NULL; | |
894 // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less. | |
895 return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off))); | |
896 } | |
897 | |
898 } | |
899 | |
900 //------------------------------add_ring--------------------------------------- | |
901 // Supplied function returns the sum of the inputs. | |
902 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const { | |
903 const TypeInt *r0 = t0->is_int(); // Handy access | |
904 const TypeInt *r1 = t1->is_int(); | |
905 | |
906 // Otherwise just MIN them bits. | |
907 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
908 } |