1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. 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.
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
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23 */
24
25 #include "precompiled.hpp"
26 #include "memory/allocation.inline.hpp"
27 #include "opto/addnode.hpp"
28 #include "opto/castnode.hpp"
29 #include "opto/cfgnode.hpp"
30 #include "opto/connode.hpp"
31 #include "opto/machnode.hpp"
32 #include "opto/movenode.hpp"
33 #include "opto/mulnode.hpp"
34 #include "opto/phaseX.hpp"
35 #include "opto/subnode.hpp"
36
37 // Portions of code courtesy of Clifford Click
38
39 // Classic Add functionality. This covers all the usual 'add' behaviors for
40 // an algebraic ring. Add-integer, add-float, add-double, and binary-or are
41 // all inherited from this class. The various identity values are supplied
42 // by virtual functions.
43
44
45 //=============================================================================
46 //------------------------------hash-------------------------------------------
47 // Hash function over AddNodes. Needs to be commutative; i.e., I swap
48 // (commute) inputs to AddNodes willy-nilly so the hash function must return
49 // the same value in the presence of edge swapping.
50 uint AddNode::hash() const {
51 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode();
52 }
53
54 //------------------------------Identity---------------------------------------
55 // If either input is a constant 0, return the other input.
56 Node* AddNode::Identity(PhaseGVN* phase) {
57 const Type *zero = add_id(); // The additive identity
58 if( phase->type( in(1) )->higher_equal( zero ) ) return in(2);
59 if( phase->type( in(2) )->higher_equal( zero ) ) return in(1);
60 return this;
61 }
62
63 //------------------------------commute----------------------------------------
64 // Commute operands to move loads and constants to the right.
65 static bool commute(PhaseGVN* phase, Node* add) {
66 Node *in1 = add->in(1);
67 Node *in2 = add->in(2);
68
69 // convert "max(a,b) + min(a,b)" into "a+b".
70 if ((in1->Opcode() == add->as_Add()->max_opcode() && in2->Opcode() == add->as_Add()->min_opcode())
71 || (in1->Opcode() == add->as_Add()->min_opcode() && in2->Opcode() == add->as_Add()->max_opcode())) {
72 Node *in11 = in1->in(1);
73 Node *in12 = in1->in(2);
74
75 Node *in21 = in2->in(1);
76 Node *in22 = in2->in(2);
77
78 if ((in11 == in21 && in12 == in22) ||
79 (in11 == in22 && in12 == in21)) {
80 add->set_req(1, in11);
81 add->set_req(2, in12);
82 PhaseIterGVN* igvn = phase->is_IterGVN();
83 if (igvn) {
84 igvn->_worklist.push(in1);
85 igvn->_worklist.push(in2);
86 }
87 return true;
88 }
89 }
90
91 bool con_left = phase->type(in1)->singleton();
92 bool con_right = phase->type(in2)->singleton();
93
94 // Convert "1+x" into "x+1".
95 // Right is a constant; leave it
96 if( con_right ) return false;
97 // Left is a constant; move it right.
98 if( con_left ) {
99 add->swap_edges(1, 2);
100 return true;
101 }
102
103 // Convert "Load+x" into "x+Load".
104 // Now check for loads
105 if (in2->is_Load()) {
106 if (!in1->is_Load()) {
107 // already x+Load to return
108 return false;
109 }
110 // both are loads, so fall through to sort inputs by idx
111 } else if( in1->is_Load() ) {
112 // Left is a Load and Right is not; move it right.
113 add->swap_edges(1, 2);
114 return true;
115 }
116
117 PhiNode *phi;
118 // Check for tight loop increments: Loop-phi of Add of loop-phi
119 if (in1->is_Phi() && (phi = in1->as_Phi()) && phi->region()->is_Loop() && phi->in(2) == add)
120 return false;
121 if (in2->is_Phi() && (phi = in2->as_Phi()) && phi->region()->is_Loop() && phi->in(2) == add) {
122 add->swap_edges(1, 2);
123 return true;
124 }
125
126 // Otherwise, sort inputs (commutativity) to help value numbering.
127 if( in1->_idx > in2->_idx ) {
128 add->swap_edges(1, 2);
129 return true;
130 }
131 return false;
132 }
133
134 //------------------------------Idealize---------------------------------------
135 // If we get here, we assume we are associative!
136 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) {
137 const Type *t1 = phase->type(in(1));
138 const Type *t2 = phase->type(in(2));
139 bool con_left = t1->singleton();
140 bool con_right = t2->singleton();
141
142 // Check for commutative operation desired
143 if (commute(phase, this)) return this;
144
145 AddNode *progress = NULL; // Progress flag
146
147 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a
148 // constant, and the left input is an add of a constant, flatten the
149 // expression tree.
150 Node *add1 = in(1);
151 Node *add2 = in(2);
152 int add1_op = add1->Opcode();
153 int this_op = Opcode();
154 if (con_right && t2 != Type::TOP && // Right input is a constant?
155 add1_op == this_op) { // Left input is an Add?
156
157 // Type of left _in right input
158 const Type *t12 = phase->type(add1->in(2));
159 if (t12->singleton() && t12 != Type::TOP) { // Left input is an add of a constant?
160 // Check for rare case of closed data cycle which can happen inside
161 // unreachable loops. In these cases the computation is undefined.
162 #ifdef ASSERT
163 Node *add11 = add1->in(1);
164 int add11_op = add11->Opcode();
165 if ((add1 == add1->in(1))
166 || (add11_op == this_op && add11->in(1) == add1)) {
167 assert(false, "dead loop in AddNode::Ideal");
168 }
169 #endif
170 // The Add of the flattened expression
171 Node *x1 = add1->in(1);
172 Node *x2 = phase->makecon(add1->as_Add()->add_ring(t2, t12));
173 set_req_X(2, x2, phase);
174 set_req_X(1, x1, phase);
175 progress = this; // Made progress
176 add1 = in(1);
177 add1_op = add1->Opcode();
178 }
179 }
180
181 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree.
182 if (add1_op == this_op && !con_right) {
183 Node *a12 = add1->in(2);
184 const Type *t12 = phase->type( a12 );
185 if (t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) &&
186 !(add1->in(1)->is_Phi() && (add1->in(1)->as_Phi()->is_tripcount(T_INT) || add1->in(1)->as_Phi()->is_tripcount(T_LONG)))) {
187 assert(add1->in(1) != this, "dead loop in AddNode::Ideal");
188 add2 = add1->clone();
189 add2->set_req(2, in(2));
190 add2 = phase->transform(add2);
191 set_req_X(1, add2, phase);
192 set_req_X(2, a12, phase);
193 progress = this;
194 add2 = a12;
195 }
196 }
197
198 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree.
199 int add2_op = add2->Opcode();
200 if (add2_op == this_op && !con_left) {
201 Node *a22 = add2->in(2);
202 const Type *t22 = phase->type( a22 );
203 if (t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) &&
204 !(add2->in(1)->is_Phi() && (add2->in(1)->as_Phi()->is_tripcount(T_INT) || add2->in(1)->as_Phi()->is_tripcount(T_LONG)))) {
205 assert(add2->in(1) != this, "dead loop in AddNode::Ideal");
206 Node *addx = add2->clone();
207 addx->set_req(1, in(1));
208 addx->set_req(2, add2->in(1));
209 addx = phase->transform(addx);
210 set_req_X(1, addx, phase);
211 set_req_X(2, a22, phase);
212 progress = this;
213 }
214 }
215
216 return progress;
217 }
218
219 //------------------------------Value-----------------------------------------
220 // An add node sums it's two _in. If one input is an RSD, we must mixin
221 // the other input's symbols.
222 const Type* AddNode::Value(PhaseGVN* phase) const {
223 // Either input is TOP ==> the result is TOP
224 const Type *t1 = phase->type( in(1) );
225 const Type *t2 = phase->type( in(2) );
226 if( t1 == Type::TOP ) return Type::TOP;
227 if( t2 == Type::TOP ) return Type::TOP;
228
229 // Either input is BOTTOM ==> the result is the local BOTTOM
230 const Type *bot = bottom_type();
231 if( (t1 == bot) || (t2 == bot) ||
232 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) )
233 return bot;
234
235 // Check for an addition involving the additive identity
236 const Type *tadd = add_of_identity( t1, t2 );
237 if( tadd ) return tadd;
238
239 return add_ring(t1,t2); // Local flavor of type addition
240 }
241
242 //------------------------------add_identity-----------------------------------
243 // Check for addition of the identity
244 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const {
245 const Type *zero = add_id(); // The additive identity
246 if( t1->higher_equal( zero ) ) return t2;
247 if( t2->higher_equal( zero ) ) return t1;
248
249 return NULL;
250 }
251
252 AddNode* AddNode::make(Node* in1, Node* in2, BasicType bt) {
253 switch (bt) {
254 case T_INT:
255 return new AddINode(in1, in2);
256 case T_LONG:
257 return new AddLNode(in1, in2);
258 default:
259 fatal("Not implemented for %s", type2name(bt));
260 }
261 return NULL;
262 }
263
264 //=============================================================================
265 //------------------------------Idealize---------------------------------------
266 Node* AddNode::IdealIL(PhaseGVN* phase, bool can_reshape, BasicType bt) {
267 Node* in1 = in(1);
268 Node* in2 = in(2);
269 int op1 = in1->Opcode();
270 int op2 = in2->Opcode();
271 // Fold (con1-x)+con2 into (con1+con2)-x
272 if (op1 == Op_Add(bt) && op2 == Op_Sub(bt)) {
273 // Swap edges to try optimizations below
274 in1 = in2;
275 in2 = in(1);
276 op1 = op2;
277 op2 = in2->Opcode();
278 }
279 if (op1 == Op_Sub(bt)) {
280 const Type* t_sub1 = phase->type(in1->in(1));
281 const Type* t_2 = phase->type(in2 );
282 if (t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP) {
283 return SubNode::make(phase->makecon(add_ring(t_sub1, t_2)), in1->in(2), bt);
284 }
285 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)"
286 if (op2 == Op_Sub(bt)) {
287 // Check for dead cycle: d = (a-b)+(c-d)
288 assert( in1->in(2) != this && in2->in(2) != this,
289 "dead loop in AddINode::Ideal" );
290 Node* sub = SubNode::make(NULL, NULL, bt);
291 sub->init_req(1, phase->transform(AddNode::make(in1->in(1), in2->in(1), bt)));
292 sub->init_req(2, phase->transform(AddNode::make(in1->in(2), in2->in(2), bt)));
293 return sub;
294 }
295 // Convert "(a-b)+(b+c)" into "(a+c)"
296 if (op2 == Op_Add(bt) && in1->in(2) == in2->in(1)) {
297 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal/AddLNode::Ideal");
298 return AddNode::make(in1->in(1), in2->in(2), bt);
299 }
300 // Convert "(a-b)+(c+b)" into "(a+c)"
301 if (op2 == Op_Add(bt) && in1->in(2) == in2->in(2)) {
302 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddINode::Ideal/AddLNode::Ideal");
303 return AddNode::make(in1->in(1), in2->in(1), bt);
304 }
305 }
306
307 // Convert "x+(0-y)" into "(x-y)"
308 if (op2 == Op_Sub(bt) && phase->type(in2->in(1)) == TypeInteger::zero(bt)) {
309 return SubNode::make(in1, in2->in(2), bt);
310 }
311
312 // Convert "(0-y)+x" into "(x-y)"
313 if (op1 == Op_Sub(bt) && phase->type(in1->in(1)) == TypeInteger::zero(bt)) {
314 return SubNode::make(in2, in1->in(2), bt);
315 }
316
317 // Associative
318 if (op1 == Op_Mul(bt) && op2 == Op_Mul(bt)) {
319 Node* add_in1 = NULL;
320 Node* add_in2 = NULL;
321 Node* mul_in = NULL;
322
323 if (in1->in(1) == in2->in(1)) {
324 // Convert "a*b+a*c into a*(b+c)
325 add_in1 = in1->in(2);
326 add_in2 = in2->in(2);
327 mul_in = in1->in(1);
328 } else if (in1->in(2) == in2->in(1)) {
329 // Convert a*b+b*c into b*(a+c)
330 add_in1 = in1->in(1);
331 add_in2 = in2->in(2);
332 mul_in = in1->in(2);
333 } else if (in1->in(2) == in2->in(2)) {
334 // Convert a*c+b*c into (a+b)*c
335 add_in1 = in1->in(1);
336 add_in2 = in2->in(1);
337 mul_in = in1->in(2);
338 } else if (in1->in(1) == in2->in(2)) {
339 // Convert a*b+c*a into a*(b+c)
340 add_in1 = in1->in(2);
341 add_in2 = in2->in(1);
342 mul_in = in1->in(1);
343 }
344
345 if (mul_in != NULL) {
346 Node* add = phase->transform(AddNode::make(add_in1, add_in2, bt));
347 return MulNode::make(mul_in, add, bt);
348 }
349 }
350
351 // Convert (x >>> rshift) + (x << lshift) into RotateRight(x, rshift)
352 if (Matcher::match_rule_supported(Op_RotateRight) &&
353 ((op1 == Op_URShift(bt) && op2 == Op_LShift(bt)) || (op1 == Op_LShift(bt) && op2 == Op_URShift(bt))) &&
354 in1->in(1) != NULL && in1->in(1) == in2->in(1)) {
355 Node* rshift = op1 == Op_URShift(bt) ? in1->in(2) : in2->in(2);
356 Node* lshift = op1 == Op_URShift(bt) ? in2->in(2) : in1->in(2);
357 if (rshift != NULL && lshift != NULL) {
358 const TypeInt* rshift_t = phase->type(rshift)->isa_int();
359 const TypeInt* lshift_t = phase->type(lshift)->isa_int();
360 int bits = bt == T_INT ? 32 : 64;
361 int mask = bt == T_INT ? 0x1F : 0x3F;
362 if (lshift_t != NULL && lshift_t->is_con() &&
363 rshift_t != NULL && rshift_t->is_con() &&
364 ((lshift_t->get_con() & mask) == (bits - (rshift_t->get_con() & mask)))) {
365 return new RotateRightNode(in1->in(1), phase->intcon(rshift_t->get_con() & mask), TypeInteger::bottom(bt));
366 }
367 }
368 }
369
370 // Convert (~x+c) into (c-1)-x. Note there isn't a bitwise not
371 // bytecode, "~x" would typically represented as "x^(-1)", so (~x+c)
372 // will be (x^(-1))+c.
373 if (op1 == Op_Xor(bt) &&
374 (in2->Opcode() == Op_ConI || in2->Opcode() == Op_ConL) &&
375 phase->type(in1->in(2)) == TypeInteger::minus_1(bt)) {
376 Node* c_minus_one = phase->makecon(add_ring(phase->type(in(2)), TypeInteger::minus_1(bt)));
377 return SubNode::make(c_minus_one, in1->in(1), bt);
378 }
379 return AddNode::Ideal(phase, can_reshape);
380 }
381
382
383 Node* AddINode::Ideal(PhaseGVN* phase, bool can_reshape) {
384 Node* in1 = in(1);
385 Node* in2 = in(2);
386 int op1 = in1->Opcode();
387 int op2 = in2->Opcode();
388
389 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y.
390 // Helps with array allocation math constant folding
391 // See 4790063:
392 // Unrestricted transformation is unsafe for some runtime values of 'x'
393 // ( x == 0, z == 1, y == -1 ) fails
394 // ( x == -5, z == 1, y == 1 ) fails
395 // Transform works for small z and small negative y when the addition
396 // (x + (y << z)) does not cross zero.
397 // Implement support for negative y and (x >= -(y << z))
398 // Have not observed cases where type information exists to support
399 // positive y and (x <= -(y << z))
400 if (op1 == Op_URShiftI && op2 == Op_ConI &&
401 in1->in(2)->Opcode() == Op_ConI) {
402 jint z = phase->type(in1->in(2))->is_int()->get_con() & 0x1f; // only least significant 5 bits matter
403 jint y = phase->type(in2)->is_int()->get_con();
404
405 if (z < 5 && -5 < y && y < 0) {
406 const Type* t_in11 = phase->type(in1->in(1));
407 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z))) {
408 Node* a = phase->transform(new AddINode( in1->in(1), phase->intcon(y<<z)));
409 return new URShiftINode(a, in1->in(2));
410 }
411 }
412 }
413
414 return AddNode::IdealIL(phase, can_reshape, T_INT);
415 }
416
417
418 //------------------------------Identity---------------------------------------
419 // Fold (x-y)+y OR y+(x-y) into x
420 Node* AddINode::Identity(PhaseGVN* phase) {
421 if (in(1)->Opcode() == Op_SubI && in(1)->in(2) == in(2)) {
422 return in(1)->in(1);
423 } else if (in(2)->Opcode() == Op_SubI && in(2)->in(2) == in(1)) {
424 return in(2)->in(1);
425 }
426 return AddNode::Identity(phase);
427 }
428
429
430 //------------------------------add_ring---------------------------------------
431 // Supplied function returns the sum of the inputs. Guaranteed never
432 // to be passed a TOP or BOTTOM type, these are filtered out by
433 // pre-check.
434 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const {
435 const TypeInt *r0 = t0->is_int(); // Handy access
436 const TypeInt *r1 = t1->is_int();
437 int lo = java_add(r0->_lo, r1->_lo);
438 int hi = java_add(r0->_hi, r1->_hi);
439 if( !(r0->is_con() && r1->is_con()) ) {
440 // Not both constants, compute approximate result
441 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) {
442 lo = min_jint; hi = max_jint; // Underflow on the low side
443 }
444 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) {
445 lo = min_jint; hi = max_jint; // Overflow on the high side
446 }
447 if( lo > hi ) { // Handle overflow
448 lo = min_jint; hi = max_jint;
449 }
450 } else {
451 // both constants, compute precise result using 'lo' and 'hi'
452 // Semantics define overflow and underflow for integer addition
453 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0
454 }
455 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) );
456 }
457
458
459 //=============================================================================
460 //------------------------------Idealize---------------------------------------
461 Node* AddLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
462 return AddNode::IdealIL(phase, can_reshape, T_LONG);
463 }
464
465
466 //------------------------------Identity---------------------------------------
467 // Fold (x-y)+y OR y+(x-y) into x
468 Node* AddLNode::Identity(PhaseGVN* phase) {
469 if (in(1)->Opcode() == Op_SubL && in(1)->in(2) == in(2)) {
470 return in(1)->in(1);
471 } else if (in(2)->Opcode() == Op_SubL && in(2)->in(2) == in(1)) {
472 return in(2)->in(1);
473 }
474 return AddNode::Identity(phase);
475 }
476
477
478 //------------------------------add_ring---------------------------------------
479 // Supplied function returns the sum of the inputs. Guaranteed never
480 // to be passed a TOP or BOTTOM type, these are filtered out by
481 // pre-check.
482 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const {
483 const TypeLong *r0 = t0->is_long(); // Handy access
484 const TypeLong *r1 = t1->is_long();
485 jlong lo = java_add(r0->_lo, r1->_lo);
486 jlong hi = java_add(r0->_hi, r1->_hi);
487 if( !(r0->is_con() && r1->is_con()) ) {
488 // Not both constants, compute approximate result
489 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) {
490 lo =min_jlong; hi = max_jlong; // Underflow on the low side
491 }
492 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) {
493 lo = min_jlong; hi = max_jlong; // Overflow on the high side
494 }
495 if( lo > hi ) { // Handle overflow
496 lo = min_jlong; hi = max_jlong;
497 }
498 } else {
499 // both constants, compute precise result using 'lo' and 'hi'
500 // Semantics define overflow and underflow for integer addition
501 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0
502 }
503 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) );
504 }
505
506
507 //=============================================================================
508 //------------------------------add_of_identity--------------------------------
509 // Check for addition of the identity
510 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const {
511 // x ADD 0 should return x unless 'x' is a -zero
512 //
513 // const Type *zero = add_id(); // The additive identity
514 // jfloat f1 = t1->getf();
515 // jfloat f2 = t2->getf();
516 //
517 // if( t1->higher_equal( zero ) ) return t2;
518 // if( t2->higher_equal( zero ) ) return t1;
519
520 return NULL;
521 }
522
523 //------------------------------add_ring---------------------------------------
524 // Supplied function returns the sum of the inputs.
525 // This also type-checks the inputs for sanity. Guaranteed never to
526 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
527 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const {
528 // We must be adding 2 float constants.
529 return TypeF::make( t0->getf() + t1->getf() );
530 }
531
532 //------------------------------Ideal------------------------------------------
533 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) {
534 // Floating point additions are not associative because of boundary conditions (infinity)
535 return commute(phase, this) ? this : NULL;
536 }
537
538
539 //=============================================================================
540 //------------------------------add_of_identity--------------------------------
541 // Check for addition of the identity
542 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const {
543 // x ADD 0 should return x unless 'x' is a -zero
544 //
545 // const Type *zero = add_id(); // The additive identity
546 // jfloat f1 = t1->getf();
547 // jfloat f2 = t2->getf();
548 //
549 // if( t1->higher_equal( zero ) ) return t2;
550 // if( t2->higher_equal( zero ) ) return t1;
551
552 return NULL;
553 }
554 //------------------------------add_ring---------------------------------------
555 // Supplied function returns the sum of the inputs.
556 // This also type-checks the inputs for sanity. Guaranteed never to
557 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
558 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const {
559 // We must be adding 2 double constants.
560 return TypeD::make( t0->getd() + t1->getd() );
561 }
562
563 //------------------------------Ideal------------------------------------------
564 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) {
565 // Floating point additions are not associative because of boundary conditions (infinity)
566 return commute(phase, this) ? this : NULL;
567 }
568
569
570 //=============================================================================
571 //------------------------------Identity---------------------------------------
572 // If one input is a constant 0, return the other input.
573 Node* AddPNode::Identity(PhaseGVN* phase) {
574 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this;
575 }
576
577 //------------------------------Idealize---------------------------------------
578 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) {
579 // Bail out if dead inputs
580 if( phase->type( in(Address) ) == Type::TOP ) return NULL;
581
582 // If the left input is an add of a constant, flatten the expression tree.
583 const Node *n = in(Address);
584 if (n->is_AddP() && n->in(Base) == in(Base)) {
585 const AddPNode *addp = n->as_AddP(); // Left input is an AddP
586 assert( !addp->in(Address)->is_AddP() ||
587 addp->in(Address)->as_AddP() != addp,
588 "dead loop in AddPNode::Ideal" );
589 // Type of left input's right input
590 const Type *t = phase->type( addp->in(Offset) );
591 if( t == Type::TOP ) return NULL;
592 const TypeX *t12 = t->is_intptr_t();
593 if( t12->is_con() ) { // Left input is an add of a constant?
594 // If the right input is a constant, combine constants
595 const Type *temp_t2 = phase->type( in(Offset) );
596 if( temp_t2 == Type::TOP ) return NULL;
597 const TypeX *t2 = temp_t2->is_intptr_t();
598 Node* address;
599 Node* offset;
600 if( t2->is_con() ) {
601 // The Add of the flattened expression
602 address = addp->in(Address);
603 offset = phase->MakeConX(t2->get_con() + t12->get_con());
604 } else {
605 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con)
606 address = phase->transform(new AddPNode(in(Base),addp->in(Address),in(Offset)));
607 offset = addp->in(Offset);
608 }
609 set_req_X(Address, address, phase);
610 set_req_X(Offset, offset, phase);
611 return this;
612 }
613 }
614
615 // Raw pointers?
616 if( in(Base)->bottom_type() == Type::TOP ) {
617 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr.
618 if (phase->type(in(Address)) == TypePtr::NULL_PTR) {
619 Node* offset = in(Offset);
620 return new CastX2PNode(offset);
621 }
622 }
623
624 // If the right is an add of a constant, push the offset down.
625 // Convert: (ptr + (offset+con)) into (ptr+offset)+con.
626 // The idea is to merge array_base+scaled_index groups together,
627 // and only have different constant offsets from the same base.
628 const Node *add = in(Offset);
629 if( add->Opcode() == Op_AddX && add->in(1) != add ) {
630 const Type *t22 = phase->type( add->in(2) );
631 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant?
632 set_req(Address, phase->transform(new AddPNode(in(Base),in(Address),add->in(1))));
633 set_req(Offset, add->in(2));
634 PhaseIterGVN* igvn = phase->is_IterGVN();
635 if (add->outcnt() == 0 && igvn) {
636 // add disconnected.
637 igvn->_worklist.push((Node*)add);
638 }
639 return this; // Made progress
640 }
641 }
642
643 return NULL; // No progress
644 }
645
646 //------------------------------bottom_type------------------------------------
647 // Bottom-type is the pointer-type with unknown offset.
648 const Type *AddPNode::bottom_type() const {
649 if (in(Address) == NULL) return TypePtr::BOTTOM;
650 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr();
651 if( !tp ) return Type::TOP; // TOP input means TOP output
652 assert( in(Offset)->Opcode() != Op_ConP, "" );
653 const Type *t = in(Offset)->bottom_type();
654 if( t == Type::TOP )
655 return tp->add_offset(Type::OffsetTop);
656 const TypeX *tx = t->is_intptr_t();
657 intptr_t txoffset = Type::OffsetBot;
658 if (tx->is_con()) { // Left input is an add of a constant?
659 txoffset = tx->get_con();
660 }
661 return tp->add_offset(txoffset);
662 }
663
664 //------------------------------Value------------------------------------------
665 const Type* AddPNode::Value(PhaseGVN* phase) const {
666 // Either input is TOP ==> the result is TOP
667 const Type *t1 = phase->type( in(Address) );
668 const Type *t2 = phase->type( in(Offset) );
669 if( t1 == Type::TOP ) return Type::TOP;
670 if( t2 == Type::TOP ) return Type::TOP;
671
672 // Left input is a pointer
673 const TypePtr *p1 = t1->isa_ptr();
674 // Right input is an int
675 const TypeX *p2 = t2->is_intptr_t();
676 // Add 'em
677 intptr_t p2offset = Type::OffsetBot;
678 if (p2->is_con()) { // Left input is an add of a constant?
679 p2offset = p2->get_con();
680 }
681 return p1->add_offset(p2offset);
682 }
683
684 //------------------------Ideal_base_and_offset--------------------------------
685 // Split an oop pointer into a base and offset.
686 // (The offset might be Type::OffsetBot in the case of an array.)
687 // Return the base, or NULL if failure.
688 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase,
689 // second return value:
690 intptr_t& offset) {
691 if (ptr->is_AddP()) {
692 Node* base = ptr->in(AddPNode::Base);
693 Node* addr = ptr->in(AddPNode::Address);
694 Node* offs = ptr->in(AddPNode::Offset);
695 if (base == addr || base->is_top()) {
696 offset = phase->find_intptr_t_con(offs, Type::OffsetBot);
697 if (offset != Type::OffsetBot) {
698 return addr;
699 }
700 }
701 }
702 offset = Type::OffsetBot;
703 return NULL;
704 }
705
706 //------------------------------unpack_offsets----------------------------------
707 // Collect the AddP offset values into the elements array, giving up
708 // if there are more than length.
709 int AddPNode::unpack_offsets(Node* elements[], int length) {
710 int count = 0;
711 Node* addr = this;
712 Node* base = addr->in(AddPNode::Base);
713 while (addr->is_AddP()) {
714 if (addr->in(AddPNode::Base) != base) {
715 // give up
716 return -1;
717 }
718 elements[count++] = addr->in(AddPNode::Offset);
719 if (count == length) {
720 // give up
721 return -1;
722 }
723 addr = addr->in(AddPNode::Address);
724 }
725 if (addr != base) {
726 return -1;
727 }
728 return count;
729 }
730
731 //------------------------------match_edge-------------------------------------
732 // Do we Match on this edge index or not? Do not match base pointer edge
733 uint AddPNode::match_edge(uint idx) const {
734 return idx > Base;
735 }
736
737 //=============================================================================
738 //------------------------------Identity---------------------------------------
739 Node* OrINode::Identity(PhaseGVN* phase) {
740 // x | x => x
741 if (in(1) == in(2)) {
742 return in(1);
743 }
744
745 return AddNode::Identity(phase);
746 }
747
748 // Find shift value for Integer or Long OR.
749 Node* rotate_shift(PhaseGVN* phase, Node* lshift, Node* rshift, int mask) {
750 // val << norm_con_shift | val >> ({32|64} - norm_con_shift) => rotate_left val, norm_con_shift
751 const TypeInt* lshift_t = phase->type(lshift)->isa_int();
752 const TypeInt* rshift_t = phase->type(rshift)->isa_int();
753 if (lshift_t != NULL && lshift_t->is_con() &&
754 rshift_t != NULL && rshift_t->is_con() &&
755 ((lshift_t->get_con() & mask) == ((mask + 1) - (rshift_t->get_con() & mask)))) {
756 return phase->intcon(lshift_t->get_con() & mask);
757 }
758 // val << var_shift | val >> ({0|32|64} - var_shift) => rotate_left val, var_shift
759 if (rshift->Opcode() == Op_SubI && rshift->in(2) == lshift && rshift->in(1)->is_Con()){
760 const TypeInt* shift_t = phase->type(rshift->in(1))->isa_int();
761 if (shift_t != NULL && shift_t->is_con() &&
762 (shift_t->get_con() == 0 || shift_t->get_con() == (mask + 1))) {
763 return lshift;
764 }
765 }
766 return NULL;
767 }
768
769 Node* OrINode::Ideal(PhaseGVN* phase, bool can_reshape) {
770 int lopcode = in(1)->Opcode();
771 int ropcode = in(2)->Opcode();
772 if (Matcher::match_rule_supported(Op_RotateLeft) &&
773 lopcode == Op_LShiftI && ropcode == Op_URShiftI && in(1)->in(1) == in(2)->in(1)) {
774 Node* lshift = in(1)->in(2);
775 Node* rshift = in(2)->in(2);
776 Node* shift = rotate_shift(phase, lshift, rshift, 0x1F);
777 if (shift != NULL) {
778 return new RotateLeftNode(in(1)->in(1), shift, TypeInt::INT);
779 }
780 return NULL;
781 }
782 if (Matcher::match_rule_supported(Op_RotateRight) &&
783 lopcode == Op_URShiftI && ropcode == Op_LShiftI && in(1)->in(1) == in(2)->in(1)) {
784 Node* rshift = in(1)->in(2);
785 Node* lshift = in(2)->in(2);
786 Node* shift = rotate_shift(phase, rshift, lshift, 0x1F);
787 if (shift != NULL) {
788 return new RotateRightNode(in(1)->in(1), shift, TypeInt::INT);
789 }
790 }
791 return NULL;
792 }
793
794 //------------------------------add_ring---------------------------------------
795 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For
796 // the logical operations the ring's ADD is really a logical OR function.
797 // This also type-checks the inputs for sanity. Guaranteed never to
798 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
799 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const {
800 const TypeInt *r0 = t0->is_int(); // Handy access
801 const TypeInt *r1 = t1->is_int();
802
803 // If both args are bool, can figure out better types
804 if ( r0 == TypeInt::BOOL ) {
805 if ( r1 == TypeInt::ONE) {
806 return TypeInt::ONE;
807 } else if ( r1 == TypeInt::BOOL ) {
808 return TypeInt::BOOL;
809 }
810 } else if ( r0 == TypeInt::ONE ) {
811 if ( r1 == TypeInt::BOOL ) {
812 return TypeInt::ONE;
813 }
814 }
815
816 // If either input is not a constant, just return all integers.
817 if( !r0->is_con() || !r1->is_con() )
818 return TypeInt::INT; // Any integer, but still no symbols.
819
820 // Otherwise just OR them bits.
821 return TypeInt::make( r0->get_con() | r1->get_con() );
822 }
823
824 //=============================================================================
825 //------------------------------Identity---------------------------------------
826 Node* OrLNode::Identity(PhaseGVN* phase) {
827 // x | x => x
828 if (in(1) == in(2)) {
829 return in(1);
830 }
831
832 return AddNode::Identity(phase);
833 }
834
835 Node* OrLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
836 int lopcode = in(1)->Opcode();
837 int ropcode = in(2)->Opcode();
838 if (Matcher::match_rule_supported(Op_RotateLeft) &&
839 lopcode == Op_LShiftL && ropcode == Op_URShiftL && in(1)->in(1) == in(2)->in(1)) {
840 Node* lshift = in(1)->in(2);
841 Node* rshift = in(2)->in(2);
842 Node* shift = rotate_shift(phase, lshift, rshift, 0x3F);
843 if (shift != NULL) {
844 return new RotateLeftNode(in(1)->in(1), shift, TypeLong::LONG);
845 }
846 return NULL;
847 }
848 if (Matcher::match_rule_supported(Op_RotateRight) &&
849 lopcode == Op_URShiftL && ropcode == Op_LShiftL && in(1)->in(1) == in(2)->in(1)) {
850 Node* rshift = in(1)->in(2);
851 Node* lshift = in(2)->in(2);
852 Node* shift = rotate_shift(phase, rshift, lshift, 0x3F);
853 if (shift != NULL) {
854 return new RotateRightNode(in(1)->in(1), shift, TypeLong::LONG);
855 }
856 }
857 return NULL;
858 }
859
860 //------------------------------add_ring---------------------------------------
861 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const {
862 const TypeLong *r0 = t0->is_long(); // Handy access
863 const TypeLong *r1 = t1->is_long();
864
865 // If either input is not a constant, just return all integers.
866 if( !r0->is_con() || !r1->is_con() )
867 return TypeLong::LONG; // Any integer, but still no symbols.
868
869 // Otherwise just OR them bits.
870 return TypeLong::make( r0->get_con() | r1->get_con() );
871 }
872
873 //=============================================================================
874 //------------------------------Idealize---------------------------------------
875 Node* XorINode::Ideal(PhaseGVN* phase, bool can_reshape) {
876 Node* in1 = in(1);
877 Node* in2 = in(2);
878 int op1 = in1->Opcode();
879 // Convert ~(x+c) into (-c-1)-x. Note there isn't a bitwise not
880 // bytecode, "~x" would typically represented as "x^(-1)", so ~(x+c)
881 // will eventually be (x+c)^-1.
882 if (op1 == Op_AddI && phase->type(in2) == TypeInt::MINUS_1 &&
883 in1->in(2)->Opcode() == Op_ConI) {
884 jint c = phase->type(in1->in(2))->isa_int()->get_con();
885 Node* neg_c_minus_one = phase->intcon(java_add(-c, -1));
886 return new SubINode(neg_c_minus_one, in1->in(1));
887 }
888 return AddNode::Ideal(phase, can_reshape);
889 }
890
891 const Type* XorINode::Value(PhaseGVN* phase) const {
892 Node* in1 = in(1);
893 Node* in2 = in(2);
894 const Type* t1 = phase->type(in1);
895 const Type* t2 = phase->type(in2);
896 if (t1 == Type::TOP || t2 == Type::TOP) {
897 return Type::TOP;
898 }
899 // x ^ x ==> 0
900 if (in1->eqv_uncast(in2)) {
901 return add_id();
902 }
903 // result of xor can only have bits sets where any of the
904 // inputs have bits set. lo can always become 0.
905 const TypeInt* t1i = t1->is_int();
906 const TypeInt* t2i = t2->is_int();
907 if ((t1i->_lo >= 0) &&
908 (t1i->_hi > 0) &&
909 (t2i->_lo >= 0) &&
910 (t2i->_hi > 0)) {
911 // hi - set all bits below the highest bit. Using round_down to avoid overflow.
912 const TypeInt* t1x = TypeInt::make(0, round_down_power_of_2(t1i->_hi) + (round_down_power_of_2(t1i->_hi) - 1), t1i->_widen);
913 const TypeInt* t2x = TypeInt::make(0, round_down_power_of_2(t2i->_hi) + (round_down_power_of_2(t2i->_hi) - 1), t2i->_widen);
914 return t1x->meet(t2x);
915 }
916 return AddNode::Value(phase);
917 }
918
919
920 //------------------------------add_ring---------------------------------------
921 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For
922 // the logical operations the ring's ADD is really a logical OR function.
923 // This also type-checks the inputs for sanity. Guaranteed never to
924 // be passed a TOP or BOTTOM type, these are filtered out by pre-check.
925 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const {
926 const TypeInt *r0 = t0->is_int(); // Handy access
927 const TypeInt *r1 = t1->is_int();
928
929 // Complementing a boolean?
930 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE
931 || r1 == TypeInt::BOOL))
932 return TypeInt::BOOL;
933
934 if( !r0->is_con() || !r1->is_con() ) // Not constants
935 return TypeInt::INT; // Any integer, but still no symbols.
936
937 // Otherwise just XOR them bits.
938 return TypeInt::make( r0->get_con() ^ r1->get_con() );
939 }
940
941 //=============================================================================
942 //------------------------------add_ring---------------------------------------
943 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const {
944 const TypeLong *r0 = t0->is_long(); // Handy access
945 const TypeLong *r1 = t1->is_long();
946
947 // If either input is not a constant, just return all integers.
948 if( !r0->is_con() || !r1->is_con() )
949 return TypeLong::LONG; // Any integer, but still no symbols.
950
951 // Otherwise just OR them bits.
952 return TypeLong::make( r0->get_con() ^ r1->get_con() );
953 }
954
955 Node* XorLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
956 Node* in1 = in(1);
957 Node* in2 = in(2);
958 int op1 = in1->Opcode();
959 // Convert ~(x+c) into (-c-1)-x. Note there isn't a bitwise not
960 // bytecode, "~x" would typically represented as "x^(-1)", so ~(x+c)
961 // will eventually be (x+c)^-1.
962 if (op1 == Op_AddL && phase->type(in2) == TypeLong::MINUS_1 &&
963 in1->in(2)->Opcode() == Op_ConL) {
964 jlong c = phase->type(in1->in(2))->isa_long()->get_con();
965 Node* neg_c_minus_one = phase->longcon(java_add(-c, (jlong)-1));
966 return new SubLNode(neg_c_minus_one, in1->in(1));
967 }
968 return AddNode::Ideal(phase, can_reshape);
969 }
970
971 const Type* XorLNode::Value(PhaseGVN* phase) const {
972 Node* in1 = in(1);
973 Node* in2 = in(2);
974 const Type* t1 = phase->type(in1);
975 const Type* t2 = phase->type(in2);
976 if (t1 == Type::TOP || t2 == Type::TOP) {
977 return Type::TOP;
978 }
979 // x ^ x ==> 0
980 if (in1->eqv_uncast(in2)) {
981 return add_id();
982 }
983 // result of xor can only have bits sets where any of the
984 // inputs have bits set. lo can always become 0.
985 const TypeLong* t1l = t1->is_long();
986 const TypeLong* t2l = t2->is_long();
987 if ((t1l->_lo >= 0) &&
988 (t1l->_hi > 0) &&
989 (t2l->_lo >= 0) &&
990 (t2l->_hi > 0)) {
991 // hi - set all bits below the highest bit. Using round_down to avoid overflow.
992 const TypeLong* t1x = TypeLong::make(0, round_down_power_of_2(t1l->_hi) + (round_down_power_of_2(t1l->_hi) - 1), t1l->_widen);
993 const TypeLong* t2x = TypeLong::make(0, round_down_power_of_2(t2l->_hi) + (round_down_power_of_2(t2l->_hi) - 1), t2l->_widen);
994 return t1x->meet(t2x);
995 }
996 return AddNode::Value(phase);
997 }
998
999 Node* MaxNode::build_min_max(Node* a, Node* b, bool is_max, bool is_unsigned, const Type* t, PhaseGVN& gvn) {
1000 bool is_int = gvn.type(a)->isa_int();
1001 assert(is_int || gvn.type(a)->isa_long(), "int or long inputs");
1002 assert(is_int == (gvn.type(b)->isa_int() != NULL), "inconsistent inputs");
1003 BasicType bt = is_int ? T_INT: T_LONG;
1004 Node* hook = NULL;
1005 if (gvn.is_IterGVN()) {
1006 // Make sure a and b are not destroyed
1007 hook = new Node(2);
1008 hook->init_req(0, a);
1009 hook->init_req(1, b);
1010 }
1011 Node* res = NULL;
1012 if (is_int && !is_unsigned) {
1013 if (is_max) {
1014 res = gvn.transform(new MaxINode(a, b));
1015 assert(gvn.type(res)->is_int()->_lo >= t->is_int()->_lo && gvn.type(res)->is_int()->_hi <= t->is_int()->_hi, "type doesn't match");
1016 } else {
1017 Node* res = gvn.transform(new MinINode(a, b));
1018 assert(gvn.type(res)->is_int()->_lo >= t->is_int()->_lo && gvn.type(res)->is_int()->_hi <= t->is_int()->_hi, "type doesn't match");
1019 }
1020 } else {
1021 Node* cmp = NULL;
1022 if (is_max) {
1023 cmp = gvn.transform(CmpNode::make(a, b, bt, is_unsigned));
1024 } else {
1025 cmp = gvn.transform(CmpNode::make(b, a, bt, is_unsigned));
1026 }
1027 Node* bol = gvn.transform(new BoolNode(cmp, BoolTest::lt));
1028 res = gvn.transform(CMoveNode::make(NULL, bol, a, b, t));
1029 }
1030 if (hook != NULL) {
1031 hook->destruct(&gvn);
1032 }
1033 return res;
1034 }
1035
1036 Node* MaxNode::build_min_max_diff_with_zero(Node* a, Node* b, bool is_max, const Type* t, PhaseGVN& gvn) {
1037 bool is_int = gvn.type(a)->isa_int();
1038 assert(is_int || gvn.type(a)->isa_long(), "int or long inputs");
1039 assert(is_int == (gvn.type(b)->isa_int() != NULL), "inconsistent inputs");
1040 BasicType bt = is_int ? T_INT: T_LONG;
1041 Node* zero = gvn.integercon(0, bt);
1042 Node* hook = NULL;
1043 if (gvn.is_IterGVN()) {
1044 // Make sure a and b are not destroyed
1045 hook = new Node(2);
1046 hook->init_req(0, a);
1047 hook->init_req(1, b);
1048 }
1049 Node* cmp = NULL;
1050 if (is_max) {
1051 cmp = gvn.transform(CmpNode::make(a, b, bt, false));
1052 } else {
1053 cmp = gvn.transform(CmpNode::make(b, a, bt, false));
1054 }
1055 Node* sub = gvn.transform(SubNode::make(a, b, bt));
1056 Node* bol = gvn.transform(new BoolNode(cmp, BoolTest::lt));
1057 Node* res = gvn.transform(CMoveNode::make(NULL, bol, sub, zero, t));
1058 if (hook != NULL) {
1059 hook->destruct(&gvn);
1060 }
1061 return res;
1062 }
1063
1064 //=============================================================================
1065 //------------------------------add_ring---------------------------------------
1066 // Supplied function returns the sum of the inputs.
1067 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const {
1068 const TypeInt *r0 = t0->is_int(); // Handy access
1069 const TypeInt *r1 = t1->is_int();
1070
1071 // Otherwise just MAX them bits.
1072 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) );
1073 }
1074
1075 // Check if addition of an integer with type 't' and a constant 'c' can overflow
1076 static bool can_overflow(const TypeInt* t, jint c) {
1077 jint t_lo = t->_lo;
1078 jint t_hi = t->_hi;
1079 return ((c < 0 && (java_add(t_lo, c) > t_lo)) ||
1080 (c > 0 && (java_add(t_hi, c) < t_hi)));
1081 }
1082
1083 //=============================================================================
1084 //------------------------------Idealize---------------------------------------
1085 // MINs show up in range-check loop limit calculations. Look for
1086 // "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)"
1087 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) {
1088 Node *progress = NULL;
1089 // Force a right-spline graph
1090 Node *l = in(1);
1091 Node *r = in(2);
1092 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) )
1093 // to force a right-spline graph for the rest of MinINode::Ideal().
1094 if( l->Opcode() == Op_MinI ) {
1095 assert( l != l->in(1), "dead loop in MinINode::Ideal" );
1096 r = phase->transform(new MinINode(l->in(2),r));
1097 l = l->in(1);
1098 set_req_X(1, l, phase);
1099 set_req_X(2, r, phase);
1100 return this;
1101 }
1102
1103 // Get left input & constant
1104 Node *x = l;
1105 jint x_off = 0;
1106 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant
1107 x->in(2)->is_Con() ) {
1108 const Type *t = x->in(2)->bottom_type();
1109 if( t == Type::TOP ) return NULL; // No progress
1110 x_off = t->is_int()->get_con();
1111 x = x->in(1);
1112 }
1113
1114 // Scan a right-spline-tree for MINs
1115 Node *y = r;
1116 jint y_off = 0;
1117 // Check final part of MIN tree
1118 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant
1119 y->in(2)->is_Con() ) {
1120 const Type *t = y->in(2)->bottom_type();
1121 if( t == Type::TOP ) return NULL; // No progress
1122 y_off = t->is_int()->get_con();
1123 y = y->in(1);
1124 }
1125 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) {
1126 swap_edges(1, 2);
1127 return this;
1128 }
1129
1130 const TypeInt* tx = phase->type(x)->isa_int();
1131
1132 if( r->Opcode() == Op_MinI ) {
1133 assert( r != r->in(2), "dead loop in MinINode::Ideal" );
1134 y = r->in(1);
1135 // Check final part of MIN tree
1136 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant
1137 y->in(2)->is_Con() ) {
1138 const Type *t = y->in(2)->bottom_type();
1139 if( t == Type::TOP ) return NULL; // No progress
1140 y_off = t->is_int()->get_con();
1141 y = y->in(1);
1142 }
1143
1144 if( x->_idx > y->_idx )
1145 return new MinINode(r->in(1),phase->transform(new MinINode(l,r->in(2))));
1146
1147 // Transform MIN2(x + c0, MIN2(x + c1, z)) into MIN2(x + MIN2(c0, c1), z)
1148 // if x == y and the additions can't overflow.
1149 if (x == y && tx != NULL &&
1150 !can_overflow(tx, x_off) &&
1151 !can_overflow(tx, y_off)) {
1152 return new MinINode(phase->transform(new AddINode(x, phase->intcon(MIN2(x_off, y_off)))), r->in(2));
1153 }
1154 } else {
1155 // Transform MIN2(x + c0, y + c1) into x + MIN2(c0, c1)
1156 // if x == y and the additions can't overflow.
1157 if (x == y && tx != NULL &&
1158 !can_overflow(tx, x_off) &&
1159 !can_overflow(tx, y_off)) {
1160 return new AddINode(x,phase->intcon(MIN2(x_off,y_off)));
1161 }
1162 }
1163 return NULL;
1164 }
1165
1166 //------------------------------add_ring---------------------------------------
1167 // Supplied function returns the sum of the inputs.
1168 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const {
1169 const TypeInt *r0 = t0->is_int(); // Handy access
1170 const TypeInt *r1 = t1->is_int();
1171
1172 // Otherwise just MIN them bits.
1173 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) );
1174 }
1175
1176 //------------------------------add_ring---------------------------------------
1177 const Type *MinFNode::add_ring( const Type *t0, const Type *t1 ) const {
1178 const TypeF *r0 = t0->is_float_constant();
1179 const TypeF *r1 = t1->is_float_constant();
1180
1181 if (r0->is_nan()) {
1182 return r0;
1183 }
1184 if (r1->is_nan()) {
1185 return r1;
1186 }
1187
1188 float f0 = r0->getf();
1189 float f1 = r1->getf();
1190 if (f0 != 0.0f || f1 != 0.0f) {
1191 return f0 < f1 ? r0 : r1;
1192 }
1193
1194 // handle min of 0.0, -0.0 case.
1195 return (jint_cast(f0) < jint_cast(f1)) ? r0 : r1;
1196 }
1197
1198 //------------------------------add_ring---------------------------------------
1199 const Type *MinDNode::add_ring( const Type *t0, const Type *t1 ) const {
1200 const TypeD *r0 = t0->is_double_constant();
1201 const TypeD *r1 = t1->is_double_constant();
1202
1203 if (r0->is_nan()) {
1204 return r0;
1205 }
1206 if (r1->is_nan()) {
1207 return r1;
1208 }
1209
1210 double d0 = r0->getd();
1211 double d1 = r1->getd();
1212 if (d0 != 0.0 || d1 != 0.0) {
1213 return d0 < d1 ? r0 : r1;
1214 }
1215
1216 // handle min of 0.0, -0.0 case.
1217 return (jlong_cast(d0) < jlong_cast(d1)) ? r0 : r1;
1218 }
1219
1220 //------------------------------add_ring---------------------------------------
1221 const Type *MaxFNode::add_ring( const Type *t0, const Type *t1 ) const {
1222 const TypeF *r0 = t0->is_float_constant();
1223 const TypeF *r1 = t1->is_float_constant();
1224
1225 if (r0->is_nan()) {
1226 return r0;
1227 }
1228 if (r1->is_nan()) {
1229 return r1;
1230 }
1231
1232 float f0 = r0->getf();
1233 float f1 = r1->getf();
1234 if (f0 != 0.0f || f1 != 0.0f) {
1235 return f0 > f1 ? r0 : r1;
1236 }
1237
1238 // handle max of 0.0,-0.0 case.
1239 return (jint_cast(f0) > jint_cast(f1)) ? r0 : r1;
1240 }
1241
1242 //------------------------------add_ring---------------------------------------
1243 const Type *MaxDNode::add_ring( const Type *t0, const Type *t1 ) const {
1244 const TypeD *r0 = t0->is_double_constant();
1245 const TypeD *r1 = t1->is_double_constant();
1246
1247 if (r0->is_nan()) {
1248 return r0;
1249 }
1250 if (r1->is_nan()) {
1251 return r1;
1252 }
1253
1254 double d0 = r0->getd();
1255 double d1 = r1->getd();
1256 if (d0 != 0.0 || d1 != 0.0) {
1257 return d0 > d1 ? r0 : r1;
1258 }
1259
1260 // handle max of 0.0, -0.0 case.
1261 return (jlong_cast(d0) > jlong_cast(d1)) ? r0 : r1;
1262 }