Mercurial > hg > truffle
annotate src/share/vm/opto/addnode.cpp @ 2645:b2c1e959be46
Clean up around BlockBegin / StdEntry.
author | Thomas Wuerthinger <thomas@wuerthinger.net> |
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date | Wed, 11 May 2011 14:34:29 +0200 |
parents | f95d63e2154a |
children | a6eef545f1a2 |
rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
1552
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "opto/addnode.hpp" | |
28 #include "opto/cfgnode.hpp" | |
29 #include "opto/connode.hpp" | |
30 #include "opto/machnode.hpp" | |
31 #include "opto/mulnode.hpp" | |
32 #include "opto/phaseX.hpp" | |
33 #include "opto/subnode.hpp" | |
0 | 34 |
1972 | 35 // Portions of code courtesy of Clifford Click |
0 | 36 |
37 #define MAXFLOAT ((float)3.40282346638528860e+38) | |
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( PhaseTransform *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( Node *add, int con_left, int con_right ) { | |
66 Node *in1 = add->in(1); | |
67 Node *in2 = add->in(2); | |
68 | |
69 // Convert "1+x" into "x+1". | |
70 // Right is a constant; leave it | |
71 if( con_right ) return false; | |
72 // Left is a constant; move it right. | |
73 if( con_left ) { | |
74 add->swap_edges(1, 2); | |
75 return true; | |
76 } | |
77 | |
78 // Convert "Load+x" into "x+Load". | |
79 // Now check for loads | |
99
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80 if (in2->is_Load()) { |
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81 if (!in1->is_Load()) { |
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82 // already x+Load to return |
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83 return false; |
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84 } |
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85 // both are loads, so fall through to sort inputs by idx |
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86 } else if( in1->is_Load() ) { |
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87 // Left is a Load and Right is not; move it right. |
0 | 88 add->swap_edges(1, 2); |
89 return true; | |
90 } | |
91 | |
92 PhiNode *phi; | |
93 // Check for tight loop increments: Loop-phi of Add of loop-phi | |
94 if( in1->is_Phi() && (phi = in1->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add) | |
95 return false; | |
96 if( in2->is_Phi() && (phi = in2->as_Phi()) && !phi->is_copy() && phi->region()->is_Loop() && phi->in(2)==add){ | |
97 add->swap_edges(1, 2); | |
98 return true; | |
99 } | |
100 | |
101 // Otherwise, sort inputs (commutativity) to help value numbering. | |
102 if( in1->_idx > in2->_idx ) { | |
103 add->swap_edges(1, 2); | |
104 return true; | |
105 } | |
106 return false; | |
107 } | |
108 | |
109 //------------------------------Idealize--------------------------------------- | |
110 // If we get here, we assume we are associative! | |
111 Node *AddNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
112 const Type *t1 = phase->type( in(1) ); | |
113 const Type *t2 = phase->type( in(2) ); | |
114 int con_left = t1->singleton(); | |
115 int con_right = t2->singleton(); | |
116 | |
117 // Check for commutative operation desired | |
118 if( commute(this,con_left,con_right) ) return this; | |
119 | |
120 AddNode *progress = NULL; // Progress flag | |
121 | |
122 // Convert "(x+1)+2" into "x+(1+2)". If the right input is a | |
123 // constant, and the left input is an add of a constant, flatten the | |
124 // expression tree. | |
125 Node *add1 = in(1); | |
126 Node *add2 = in(2); | |
127 int add1_op = add1->Opcode(); | |
128 int this_op = Opcode(); | |
129 if( con_right && t2 != Type::TOP && // Right input is a constant? | |
130 add1_op == this_op ) { // Left input is an Add? | |
131 | |
132 // Type of left _in right input | |
133 const Type *t12 = phase->type( add1->in(2) ); | |
134 if( t12->singleton() && t12 != Type::TOP ) { // Left input is an add of a constant? | |
135 // Check for rare case of closed data cycle which can happen inside | |
136 // unreachable loops. In these cases the computation is undefined. | |
137 #ifdef ASSERT | |
138 Node *add11 = add1->in(1); | |
139 int add11_op = add11->Opcode(); | |
140 if( (add1 == add1->in(1)) | |
141 || (add11_op == this_op && add11->in(1) == add1) ) { | |
142 assert(false, "dead loop in AddNode::Ideal"); | |
143 } | |
144 #endif | |
145 // The Add of the flattened expression | |
146 Node *x1 = add1->in(1); | |
147 Node *x2 = phase->makecon( add1->as_Add()->add_ring( t2, t12 )); | |
148 PhaseIterGVN *igvn = phase->is_IterGVN(); | |
149 if( igvn ) { | |
150 set_req_X(2,x2,igvn); | |
151 set_req_X(1,x1,igvn); | |
152 } else { | |
153 set_req(2,x2); | |
154 set_req(1,x1); | |
155 } | |
156 progress = this; // Made progress | |
157 add1 = in(1); | |
158 add1_op = add1->Opcode(); | |
159 } | |
160 } | |
161 | |
162 // Convert "(x+1)+y" into "(x+y)+1". Push constants down the expression tree. | |
163 if( add1_op == this_op && !con_right ) { | |
164 Node *a12 = add1->in(2); | |
165 const Type *t12 = phase->type( a12 ); | |
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166 if( t12->singleton() && t12 != Type::TOP && (add1 != add1->in(1)) && |
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167 !(add1->in(1)->is_Phi() && add1->in(1)->as_Phi()->is_tripcount()) ) { |
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168 assert(add1->in(1) != this, "dead loop in AddNode::Ideal"); |
0 | 169 add2 = add1->clone(); |
170 add2->set_req(2, in(2)); | |
171 add2 = phase->transform(add2); | |
172 set_req(1, add2); | |
173 set_req(2, a12); | |
174 progress = this; | |
175 add2 = a12; | |
176 } | |
177 } | |
178 | |
179 // Convert "x+(y+1)" into "(x+y)+1". Push constants down the expression tree. | |
180 int add2_op = add2->Opcode(); | |
181 if( add2_op == this_op && !con_left ) { | |
182 Node *a22 = add2->in(2); | |
183 const Type *t22 = phase->type( a22 ); | |
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184 if( t22->singleton() && t22 != Type::TOP && (add2 != add2->in(1)) && |
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185 !(add2->in(1)->is_Phi() && add2->in(1)->as_Phi()->is_tripcount()) ) { |
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186 assert(add2->in(1) != this, "dead loop in AddNode::Ideal"); |
0 | 187 Node *addx = add2->clone(); |
188 addx->set_req(1, in(1)); | |
189 addx->set_req(2, add2->in(1)); | |
190 addx = phase->transform(addx); | |
191 set_req(1, addx); | |
192 set_req(2, a22); | |
193 progress = this; | |
194 } | |
195 } | |
196 | |
197 return progress; | |
198 } | |
199 | |
200 //------------------------------Value----------------------------------------- | |
201 // An add node sums it's two _in. If one input is an RSD, we must mixin | |
202 // the other input's symbols. | |
203 const Type *AddNode::Value( PhaseTransform *phase ) const { | |
204 // Either input is TOP ==> the result is TOP | |
205 const Type *t1 = phase->type( in(1) ); | |
206 const Type *t2 = phase->type( in(2) ); | |
207 if( t1 == Type::TOP ) return Type::TOP; | |
208 if( t2 == Type::TOP ) return Type::TOP; | |
209 | |
210 // Either input is BOTTOM ==> the result is the local BOTTOM | |
211 const Type *bot = bottom_type(); | |
212 if( (t1 == bot) || (t2 == bot) || | |
213 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
214 return bot; | |
215 | |
216 // Check for an addition involving the additive identity | |
217 const Type *tadd = add_of_identity( t1, t2 ); | |
218 if( tadd ) return tadd; | |
219 | |
220 return add_ring(t1,t2); // Local flavor of type addition | |
221 } | |
222 | |
223 //------------------------------add_identity----------------------------------- | |
224 // Check for addition of the identity | |
225 const Type *AddNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
226 const Type *zero = add_id(); // The additive identity | |
227 if( t1->higher_equal( zero ) ) return t2; | |
228 if( t2->higher_equal( zero ) ) return t1; | |
229 | |
230 return NULL; | |
231 } | |
232 | |
233 | |
234 //============================================================================= | |
235 //------------------------------Idealize--------------------------------------- | |
236 Node *AddINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
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237 Node* in1 = in(1); |
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238 Node* in2 = in(2); |
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239 int op1 = in1->Opcode(); |
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240 int op2 = in2->Opcode(); |
0 | 241 // Fold (con1-x)+con2 into (con1+con2)-x |
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242 if ( op1 == Op_AddI && op2 == Op_SubI ) { |
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243 // Swap edges to try optimizations below |
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244 in1 = in2; |
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245 in2 = in(1); |
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246 op1 = op2; |
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247 op2 = in2->Opcode(); |
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248 } |
0 | 249 if( op1 == Op_SubI ) { |
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250 const Type *t_sub1 = phase->type( in1->in(1) ); |
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251 const Type *t_2 = phase->type( in2 ); |
0 | 252 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) |
253 return new (phase->C, 3) SubINode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
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254 in1->in(2) ); |
0 | 255 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" |
256 if( op2 == Op_SubI ) { | |
257 // Check for dead cycle: d = (a-b)+(c-d) | |
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258 assert( in1->in(2) != this && in2->in(2) != this, |
0 | 259 "dead loop in AddINode::Ideal" ); |
260 Node *sub = new (phase->C, 3) SubINode(NULL, NULL); | |
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261 sub->init_req(1, phase->transform(new (phase->C, 3) AddINode(in1->in(1), in2->in(1) ) )); |
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262 sub->init_req(2, phase->transform(new (phase->C, 3) AddINode(in1->in(2), in2->in(2) ) )); |
0 | 263 return sub; |
264 } | |
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265 // Convert "(a-b)+(b+c)" into "(a+c)" |
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266 if( op2 == Op_AddI && in1->in(2) == in2->in(1) ) { |
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267 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); |
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268 return new (phase->C, 3) AddINode(in1->in(1), in2->in(2)); |
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269 } |
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270 // Convert "(a-b)+(c+b)" into "(a+c)" |
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271 if( op2 == Op_AddI && in1->in(2) == in2->in(2) ) { |
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272 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); |
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273 return new (phase->C, 3) AddINode(in1->in(1), in2->in(1)); |
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274 } |
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275 // Convert "(a-b)+(b-c)" into "(a-c)" |
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276 if( op2 == Op_SubI && in1->in(2) == in2->in(1) ) { |
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277 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddINode::Ideal"); |
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278 return new (phase->C, 3) SubINode(in1->in(1), in2->in(2)); |
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279 } |
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280 // Convert "(a-b)+(c-a)" into "(c-b)" |
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281 if( op2 == Op_SubI && in1->in(1) == in2->in(2) ) { |
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282 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddINode::Ideal"); |
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283 return new (phase->C, 3) SubINode(in2->in(1), in1->in(2)); |
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284 } |
0 | 285 } |
286 | |
287 // Convert "x+(0-y)" into "(x-y)" | |
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288 if( op2 == Op_SubI && phase->type(in2->in(1)) == TypeInt::ZERO ) |
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289 return new (phase->C, 3) SubINode(in1, in2->in(2) ); |
0 | 290 |
291 // Convert "(0-y)+x" into "(x-y)" | |
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292 if( op1 == Op_SubI && phase->type(in1->in(1)) == TypeInt::ZERO ) |
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293 return new (phase->C, 3) SubINode( in2, in1->in(2) ); |
0 | 294 |
295 // Convert (x>>>z)+y into (x+(y<<z))>>>z for small constant z and y. | |
296 // Helps with array allocation math constant folding | |
297 // See 4790063: | |
298 // Unrestricted transformation is unsafe for some runtime values of 'x' | |
299 // ( x == 0, z == 1, y == -1 ) fails | |
300 // ( x == -5, z == 1, y == 1 ) fails | |
301 // Transform works for small z and small negative y when the addition | |
302 // (x + (y << z)) does not cross zero. | |
303 // Implement support for negative y and (x >= -(y << z)) | |
304 // Have not observed cases where type information exists to support | |
305 // positive y and (x <= -(y << z)) | |
306 if( op1 == Op_URShiftI && op2 == Op_ConI && | |
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307 in1->in(2)->Opcode() == Op_ConI ) { |
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308 jint z = phase->type( in1->in(2) )->is_int()->get_con() & 0x1f; // only least significant 5 bits matter |
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309 jint y = phase->type( in2 )->is_int()->get_con(); |
0 | 310 |
311 if( z < 5 && -5 < y && y < 0 ) { | |
400
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312 const Type *t_in11 = phase->type(in1->in(1)); |
0 | 313 if( t_in11 != Type::TOP && (t_in11->is_int()->_lo >= -(y << z)) ) { |
400
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314 Node *a = phase->transform( new (phase->C, 3) AddINode( in1->in(1), phase->intcon(y<<z) ) ); |
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315 return new (phase->C, 3) URShiftINode( a, in1->in(2) ); |
0 | 316 } |
317 } | |
318 } | |
319 | |
320 return AddNode::Ideal(phase, can_reshape); | |
321 } | |
322 | |
323 | |
324 //------------------------------Identity--------------------------------------- | |
325 // Fold (x-y)+y OR y+(x-y) into x | |
326 Node *AddINode::Identity( PhaseTransform *phase ) { | |
327 if( in(1)->Opcode() == Op_SubI && phase->eqv(in(1)->in(2),in(2)) ) { | |
328 return in(1)->in(1); | |
329 } | |
330 else if( in(2)->Opcode() == Op_SubI && phase->eqv(in(2)->in(2),in(1)) ) { | |
331 return in(2)->in(1); | |
332 } | |
333 return AddNode::Identity(phase); | |
334 } | |
335 | |
336 | |
337 //------------------------------add_ring--------------------------------------- | |
338 // Supplied function returns the sum of the inputs. Guaranteed never | |
339 // to be passed a TOP or BOTTOM type, these are filtered out by | |
340 // pre-check. | |
341 const Type *AddINode::add_ring( const Type *t0, const Type *t1 ) const { | |
342 const TypeInt *r0 = t0->is_int(); // Handy access | |
343 const TypeInt *r1 = t1->is_int(); | |
344 int lo = r0->_lo + r1->_lo; | |
345 int hi = r0->_hi + r1->_hi; | |
346 if( !(r0->is_con() && r1->is_con()) ) { | |
347 // Not both constants, compute approximate result | |
348 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
349 lo = min_jint; hi = max_jint; // Underflow on the low side | |
350 } | |
351 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
352 lo = min_jint; hi = max_jint; // Overflow on the high side | |
353 } | |
354 if( lo > hi ) { // Handle overflow | |
355 lo = min_jint; hi = max_jint; | |
356 } | |
357 } else { | |
358 // both constants, compute precise result using 'lo' and 'hi' | |
359 // Semantics define overflow and underflow for integer addition | |
360 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
361 } | |
362 return TypeInt::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
363 } | |
364 | |
365 | |
366 //============================================================================= | |
367 //------------------------------Idealize--------------------------------------- | |
368 Node *AddLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
400
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369 Node* in1 = in(1); |
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370 Node* in2 = in(2); |
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371 int op1 = in1->Opcode(); |
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372 int op2 = in2->Opcode(); |
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373 // Fold (con1-x)+con2 into (con1+con2)-x |
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374 if ( op1 == Op_AddL && op2 == Op_SubL ) { |
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375 // Swap edges to try optimizations below |
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376 in1 = in2; |
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377 in2 = in(1); |
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378 op1 = op2; |
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379 op2 = in2->Opcode(); |
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380 } |
0 | 381 // Fold (con1-x)+con2 into (con1+con2)-x |
382 if( op1 == Op_SubL ) { | |
400
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383 const Type *t_sub1 = phase->type( in1->in(1) ); |
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384 const Type *t_2 = phase->type( in2 ); |
0 | 385 if( t_sub1->singleton() && t_2->singleton() && t_sub1 != Type::TOP && t_2 != Type::TOP ) |
386 return new (phase->C, 3) SubLNode(phase->makecon( add_ring( t_sub1, t_2 ) ), | |
400
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387 in1->in(2) ); |
0 | 388 // Convert "(a-b)+(c-d)" into "(a+c)-(b+d)" |
389 if( op2 == Op_SubL ) { | |
390 // Check for dead cycle: d = (a-b)+(c-d) | |
400
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391 assert( in1->in(2) != this && in2->in(2) != this, |
0 | 392 "dead loop in AddLNode::Ideal" ); |
393 Node *sub = new (phase->C, 3) SubLNode(NULL, NULL); | |
400
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394 sub->init_req(1, phase->transform(new (phase->C, 3) AddLNode(in1->in(1), in2->in(1) ) )); |
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395 sub->init_req(2, phase->transform(new (phase->C, 3) AddLNode(in1->in(2), in2->in(2) ) )); |
0 | 396 return sub; |
397 } | |
400
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398 // Convert "(a-b)+(b+c)" into "(a+c)" |
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399 if( op2 == Op_AddL && in1->in(2) == in2->in(1) ) { |
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400 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); |
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401 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(2)); |
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402 } |
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403 // Convert "(a-b)+(c+b)" into "(a+c)" |
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404 if( op2 == Op_AddL && in1->in(2) == in2->in(2) ) { |
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405 assert(in1->in(1) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); |
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406 return new (phase->C, 3) AddLNode(in1->in(1), in2->in(1)); |
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407 } |
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408 // Convert "(a-b)+(b-c)" into "(a-c)" |
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409 if( op2 == Op_SubL && in1->in(2) == in2->in(1) ) { |
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410 assert(in1->in(1) != this && in2->in(2) != this,"dead loop in AddLNode::Ideal"); |
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411 return new (phase->C, 3) SubLNode(in1->in(1), in2->in(2)); |
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412 } |
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413 // Convert "(a-b)+(c-a)" into "(c-b)" |
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414 if( op2 == Op_SubL && in1->in(1) == in1->in(2) ) { |
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415 assert(in1->in(2) != this && in2->in(1) != this,"dead loop in AddLNode::Ideal"); |
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416 return new (phase->C, 3) SubLNode(in2->in(1), in1->in(2)); |
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417 } |
0 | 418 } |
419 | |
420 // Convert "x+(0-y)" into "(x-y)" | |
400
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421 if( op2 == Op_SubL && phase->type(in2->in(1)) == TypeLong::ZERO ) |
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422 return new (phase->C, 3) SubLNode( in1, in2->in(2) ); |
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423 |
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424 // Convert "(0-y)+x" into "(x-y)" |
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425 if( op1 == Op_SubL && phase->type(in1->in(1)) == TypeInt::ZERO ) |
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426 return new (phase->C, 3) SubLNode( in2, in1->in(2) ); |
0 | 427 |
428 // Convert "X+X+X+X+X...+X+Y" into "k*X+Y" or really convert "X+(X+Y)" | |
429 // into "(X<<1)+Y" and let shift-folding happen. | |
430 if( op2 == Op_AddL && | |
400
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431 in2->in(1) == in1 && |
0 | 432 op1 != Op_ConL && |
433 0 ) { | |
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434 Node *shift = phase->transform(new (phase->C, 3) LShiftLNode(in1,phase->intcon(1))); |
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435 return new (phase->C, 3) AddLNode(shift,in2->in(2)); |
0 | 436 } |
437 | |
438 return AddNode::Ideal(phase, can_reshape); | |
439 } | |
440 | |
441 | |
442 //------------------------------Identity--------------------------------------- | |
443 // Fold (x-y)+y OR y+(x-y) into x | |
444 Node *AddLNode::Identity( PhaseTransform *phase ) { | |
445 if( in(1)->Opcode() == Op_SubL && phase->eqv(in(1)->in(2),in(2)) ) { | |
446 return in(1)->in(1); | |
447 } | |
448 else if( in(2)->Opcode() == Op_SubL && phase->eqv(in(2)->in(2),in(1)) ) { | |
449 return in(2)->in(1); | |
450 } | |
451 return AddNode::Identity(phase); | |
452 } | |
453 | |
454 | |
455 //------------------------------add_ring--------------------------------------- | |
456 // Supplied function returns the sum of the inputs. Guaranteed never | |
457 // to be passed a TOP or BOTTOM type, these are filtered out by | |
458 // pre-check. | |
459 const Type *AddLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
460 const TypeLong *r0 = t0->is_long(); // Handy access | |
461 const TypeLong *r1 = t1->is_long(); | |
462 jlong lo = r0->_lo + r1->_lo; | |
463 jlong hi = r0->_hi + r1->_hi; | |
464 if( !(r0->is_con() && r1->is_con()) ) { | |
465 // Not both constants, compute approximate result | |
466 if( (r0->_lo & r1->_lo) < 0 && lo >= 0 ) { | |
467 lo =min_jlong; hi = max_jlong; // Underflow on the low side | |
468 } | |
469 if( (~(r0->_hi | r1->_hi)) < 0 && hi < 0 ) { | |
470 lo = min_jlong; hi = max_jlong; // Overflow on the high side | |
471 } | |
472 if( lo > hi ) { // Handle overflow | |
473 lo = min_jlong; hi = max_jlong; | |
474 } | |
475 } else { | |
476 // both constants, compute precise result using 'lo' and 'hi' | |
477 // Semantics define overflow and underflow for integer addition | |
478 // as expected. In particular: 0x80000000 + 0x80000000 --> 0x0 | |
479 } | |
480 return TypeLong::make( lo, hi, MAX2(r0->_widen,r1->_widen) ); | |
481 } | |
482 | |
483 | |
484 //============================================================================= | |
485 //------------------------------add_of_identity-------------------------------- | |
486 // Check for addition of the identity | |
487 const Type *AddFNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
488 // x ADD 0 should return x unless 'x' is a -zero | |
489 // | |
490 // const Type *zero = add_id(); // The additive identity | |
491 // jfloat f1 = t1->getf(); | |
492 // jfloat f2 = t2->getf(); | |
493 // | |
494 // if( t1->higher_equal( zero ) ) return t2; | |
495 // if( t2->higher_equal( zero ) ) return t1; | |
496 | |
497 return NULL; | |
498 } | |
499 | |
500 //------------------------------add_ring--------------------------------------- | |
501 // Supplied function returns the sum of the inputs. | |
502 // This also type-checks the inputs for sanity. Guaranteed never to | |
503 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
504 const Type *AddFNode::add_ring( const Type *t0, const Type *t1 ) const { | |
505 // We must be adding 2 float constants. | |
506 return TypeF::make( t0->getf() + t1->getf() ); | |
507 } | |
508 | |
509 //------------------------------Ideal------------------------------------------ | |
510 Node *AddFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
511 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
512 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
513 } | |
514 | |
515 // Floating point additions are not associative because of boundary conditions (infinity) | |
516 return commute(this, | |
517 phase->type( in(1) )->singleton(), | |
518 phase->type( in(2) )->singleton() ) ? this : NULL; | |
519 } | |
520 | |
521 | |
522 //============================================================================= | |
523 //------------------------------add_of_identity-------------------------------- | |
524 // Check for addition of the identity | |
525 const Type *AddDNode::add_of_identity( const Type *t1, const Type *t2 ) const { | |
526 // x ADD 0 should return x unless 'x' is a -zero | |
527 // | |
528 // const Type *zero = add_id(); // The additive identity | |
529 // jfloat f1 = t1->getf(); | |
530 // jfloat f2 = t2->getf(); | |
531 // | |
532 // if( t1->higher_equal( zero ) ) return t2; | |
533 // if( t2->higher_equal( zero ) ) return t1; | |
534 | |
535 return NULL; | |
536 } | |
537 //------------------------------add_ring--------------------------------------- | |
538 // Supplied function returns the sum of the inputs. | |
539 // This also type-checks the inputs for sanity. Guaranteed never to | |
540 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
541 const Type *AddDNode::add_ring( const Type *t0, const Type *t1 ) const { | |
542 // We must be adding 2 double constants. | |
543 return TypeD::make( t0->getd() + t1->getd() ); | |
544 } | |
545 | |
546 //------------------------------Ideal------------------------------------------ | |
547 Node *AddDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
548 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
549 return AddNode::Ideal(phase, can_reshape); // commutative and associative transforms | |
550 } | |
551 | |
552 // Floating point additions are not associative because of boundary conditions (infinity) | |
553 return commute(this, | |
554 phase->type( in(1) )->singleton(), | |
555 phase->type( in(2) )->singleton() ) ? this : NULL; | |
556 } | |
557 | |
558 | |
559 //============================================================================= | |
560 //------------------------------Identity--------------------------------------- | |
561 // If one input is a constant 0, return the other input. | |
562 Node *AddPNode::Identity( PhaseTransform *phase ) { | |
563 return ( phase->type( in(Offset) )->higher_equal( TypeX_ZERO ) ) ? in(Address) : this; | |
564 } | |
565 | |
566 //------------------------------Idealize--------------------------------------- | |
567 Node *AddPNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
568 // Bail out if dead inputs | |
569 if( phase->type( in(Address) ) == Type::TOP ) return NULL; | |
570 | |
571 // If the left input is an add of a constant, flatten the expression tree. | |
572 const Node *n = in(Address); | |
573 if (n->is_AddP() && n->in(Base) == in(Base)) { | |
574 const AddPNode *addp = n->as_AddP(); // Left input is an AddP | |
575 assert( !addp->in(Address)->is_AddP() || | |
576 addp->in(Address)->as_AddP() != addp, | |
577 "dead loop in AddPNode::Ideal" ); | |
578 // Type of left input's right input | |
579 const Type *t = phase->type( addp->in(Offset) ); | |
580 if( t == Type::TOP ) return NULL; | |
581 const TypeX *t12 = t->is_intptr_t(); | |
582 if( t12->is_con() ) { // Left input is an add of a constant? | |
583 // If the right input is a constant, combine constants | |
584 const Type *temp_t2 = phase->type( in(Offset) ); | |
585 if( temp_t2 == Type::TOP ) return NULL; | |
586 const TypeX *t2 = temp_t2->is_intptr_t(); | |
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587 Node* address; |
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588 Node* offset; |
0 | 589 if( t2->is_con() ) { |
590 // The Add of the flattened expression | |
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591 address = addp->in(Address); |
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592 offset = phase->MakeConX(t2->get_con() + t12->get_con()); |
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593 } else { |
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594 // Else move the constant to the right. ((A+con)+B) into ((A+B)+con) |
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595 address = phase->transform(new (phase->C, 4) AddPNode(in(Base),addp->in(Address),in(Offset))); |
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596 offset = addp->in(Offset); |
0 | 597 } |
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598 PhaseIterGVN *igvn = phase->is_IterGVN(); |
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599 if( igvn ) { |
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600 set_req_X(Address,address,igvn); |
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601 set_req_X(Offset,offset,igvn); |
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602 } else { |
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603 set_req(Address,address); |
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604 set_req(Offset,offset); |
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605 } |
0 | 606 return this; |
607 } | |
608 } | |
609 | |
610 // Raw pointers? | |
611 if( in(Base)->bottom_type() == Type::TOP ) { | |
612 // If this is a NULL+long form (from unsafe accesses), switch to a rawptr. | |
613 if (phase->type(in(Address)) == TypePtr::NULL_PTR) { | |
614 Node* offset = in(Offset); | |
615 return new (phase->C, 2) CastX2PNode(offset); | |
616 } | |
617 } | |
618 | |
619 // If the right is an add of a constant, push the offset down. | |
620 // Convert: (ptr + (offset+con)) into (ptr+offset)+con. | |
621 // The idea is to merge array_base+scaled_index groups together, | |
622 // and only have different constant offsets from the same base. | |
623 const Node *add = in(Offset); | |
624 if( add->Opcode() == Op_AddX && add->in(1) != add ) { | |
625 const Type *t22 = phase->type( add->in(2) ); | |
626 if( t22->singleton() && (t22 != Type::TOP) ) { // Right input is an add of a constant? | |
627 set_req(Address, phase->transform(new (phase->C, 4) AddPNode(in(Base),in(Address),add->in(1)))); | |
628 set_req(Offset, add->in(2)); | |
629 return this; // Made progress | |
630 } | |
631 } | |
632 | |
633 return NULL; // No progress | |
634 } | |
635 | |
636 //------------------------------bottom_type------------------------------------ | |
637 // Bottom-type is the pointer-type with unknown offset. | |
638 const Type *AddPNode::bottom_type() const { | |
639 if (in(Address) == NULL) return TypePtr::BOTTOM; | |
640 const TypePtr *tp = in(Address)->bottom_type()->isa_ptr(); | |
641 if( !tp ) return Type::TOP; // TOP input means TOP output | |
642 assert( in(Offset)->Opcode() != Op_ConP, "" ); | |
643 const Type *t = in(Offset)->bottom_type(); | |
644 if( t == Type::TOP ) | |
645 return tp->add_offset(Type::OffsetTop); | |
646 const TypeX *tx = t->is_intptr_t(); | |
647 intptr_t txoffset = Type::OffsetBot; | |
648 if (tx->is_con()) { // Left input is an add of a constant? | |
649 txoffset = tx->get_con(); | |
650 } | |
651 return tp->add_offset(txoffset); | |
652 } | |
653 | |
654 //------------------------------Value------------------------------------------ | |
655 const Type *AddPNode::Value( PhaseTransform *phase ) const { | |
656 // Either input is TOP ==> the result is TOP | |
657 const Type *t1 = phase->type( in(Address) ); | |
658 const Type *t2 = phase->type( in(Offset) ); | |
659 if( t1 == Type::TOP ) return Type::TOP; | |
660 if( t2 == Type::TOP ) return Type::TOP; | |
661 | |
662 // Left input is a pointer | |
663 const TypePtr *p1 = t1->isa_ptr(); | |
664 // Right input is an int | |
665 const TypeX *p2 = t2->is_intptr_t(); | |
666 // Add 'em | |
667 intptr_t p2offset = Type::OffsetBot; | |
668 if (p2->is_con()) { // Left input is an add of a constant? | |
669 p2offset = p2->get_con(); | |
670 } | |
671 return p1->add_offset(p2offset); | |
672 } | |
673 | |
674 //------------------------Ideal_base_and_offset-------------------------------- | |
675 // Split an oop pointer into a base and offset. | |
676 // (The offset might be Type::OffsetBot in the case of an array.) | |
677 // Return the base, or NULL if failure. | |
678 Node* AddPNode::Ideal_base_and_offset(Node* ptr, PhaseTransform* phase, | |
679 // second return value: | |
680 intptr_t& offset) { | |
681 if (ptr->is_AddP()) { | |
682 Node* base = ptr->in(AddPNode::Base); | |
683 Node* addr = ptr->in(AddPNode::Address); | |
684 Node* offs = ptr->in(AddPNode::Offset); | |
685 if (base == addr || base->is_top()) { | |
686 offset = phase->find_intptr_t_con(offs, Type::OffsetBot); | |
687 if (offset != Type::OffsetBot) { | |
688 return addr; | |
689 } | |
690 } | |
691 } | |
692 offset = Type::OffsetBot; | |
693 return NULL; | |
694 } | |
695 | |
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696 //------------------------------unpack_offsets---------------------------------- |
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697 // Collect the AddP offset values into the elements array, giving up |
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698 // if there are more than length. |
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699 int AddPNode::unpack_offsets(Node* elements[], int length) { |
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700 int count = 0; |
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701 Node* addr = this; |
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702 Node* base = addr->in(AddPNode::Base); |
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703 while (addr->is_AddP()) { |
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704 if (addr->in(AddPNode::Base) != base) { |
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705 // give up |
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706 return -1; |
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707 } |
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708 elements[count++] = addr->in(AddPNode::Offset); |
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709 if (count == length) { |
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710 // give up |
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711 return -1; |
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712 } |
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713 addr = addr->in(AddPNode::Address); |
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714 } |
1763 | 715 if (addr != base) { |
716 return -1; | |
717 } | |
17
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718 return count; |
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719 } |
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720 |
0 | 721 //------------------------------match_edge------------------------------------- |
722 // Do we Match on this edge index or not? Do not match base pointer edge | |
723 uint AddPNode::match_edge(uint idx) const { | |
724 return idx > Base; | |
725 } | |
726 | |
727 //============================================================================= | |
728 //------------------------------Identity--------------------------------------- | |
729 Node *OrINode::Identity( PhaseTransform *phase ) { | |
730 // x | x => x | |
731 if (phase->eqv(in(1), in(2))) { | |
732 return in(1); | |
733 } | |
734 | |
735 return AddNode::Identity(phase); | |
736 } | |
737 | |
738 //------------------------------add_ring--------------------------------------- | |
739 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
740 // the logical operations the ring's ADD is really a logical OR function. | |
741 // This also type-checks the inputs for sanity. Guaranteed never to | |
742 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
743 const Type *OrINode::add_ring( const Type *t0, const Type *t1 ) const { | |
744 const TypeInt *r0 = t0->is_int(); // Handy access | |
745 const TypeInt *r1 = t1->is_int(); | |
746 | |
747 // If both args are bool, can figure out better types | |
748 if ( r0 == TypeInt::BOOL ) { | |
749 if ( r1 == TypeInt::ONE) { | |
750 return TypeInt::ONE; | |
751 } else if ( r1 == TypeInt::BOOL ) { | |
752 return TypeInt::BOOL; | |
753 } | |
754 } else if ( r0 == TypeInt::ONE ) { | |
755 if ( r1 == TypeInt::BOOL ) { | |
756 return TypeInt::ONE; | |
757 } | |
758 } | |
759 | |
760 // If either input is not a constant, just return all integers. | |
761 if( !r0->is_con() || !r1->is_con() ) | |
762 return TypeInt::INT; // Any integer, but still no symbols. | |
763 | |
764 // Otherwise just OR them bits. | |
765 return TypeInt::make( r0->get_con() | r1->get_con() ); | |
766 } | |
767 | |
768 //============================================================================= | |
769 //------------------------------Identity--------------------------------------- | |
770 Node *OrLNode::Identity( PhaseTransform *phase ) { | |
771 // x | x => x | |
772 if (phase->eqv(in(1), in(2))) { | |
773 return in(1); | |
774 } | |
775 | |
776 return AddNode::Identity(phase); | |
777 } | |
778 | |
779 //------------------------------add_ring--------------------------------------- | |
780 const Type *OrLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
781 const TypeLong *r0 = t0->is_long(); // Handy access | |
782 const TypeLong *r1 = t1->is_long(); | |
783 | |
784 // If either input is not a constant, just return all integers. | |
785 if( !r0->is_con() || !r1->is_con() ) | |
786 return TypeLong::LONG; // Any integer, but still no symbols. | |
787 | |
788 // Otherwise just OR them bits. | |
789 return TypeLong::make( r0->get_con() | r1->get_con() ); | |
790 } | |
791 | |
792 //============================================================================= | |
793 //------------------------------add_ring--------------------------------------- | |
794 // Supplied function returns the sum of the inputs IN THE CURRENT RING. For | |
795 // the logical operations the ring's ADD is really a logical OR function. | |
796 // This also type-checks the inputs for sanity. Guaranteed never to | |
797 // be passed a TOP or BOTTOM type, these are filtered out by pre-check. | |
798 const Type *XorINode::add_ring( const Type *t0, const Type *t1 ) const { | |
799 const TypeInt *r0 = t0->is_int(); // Handy access | |
800 const TypeInt *r1 = t1->is_int(); | |
801 | |
802 // Complementing a boolean? | |
803 if( r0 == TypeInt::BOOL && ( r1 == TypeInt::ONE | |
804 || r1 == TypeInt::BOOL)) | |
805 return TypeInt::BOOL; | |
806 | |
807 if( !r0->is_con() || !r1->is_con() ) // Not constants | |
808 return TypeInt::INT; // Any integer, but still no symbols. | |
809 | |
810 // Otherwise just XOR them bits. | |
811 return TypeInt::make( r0->get_con() ^ r1->get_con() ); | |
812 } | |
813 | |
814 //============================================================================= | |
815 //------------------------------add_ring--------------------------------------- | |
816 const Type *XorLNode::add_ring( const Type *t0, const Type *t1 ) const { | |
817 const TypeLong *r0 = t0->is_long(); // Handy access | |
818 const TypeLong *r1 = t1->is_long(); | |
819 | |
820 // If either input is not a constant, just return all integers. | |
821 if( !r0->is_con() || !r1->is_con() ) | |
822 return TypeLong::LONG; // Any integer, but still no symbols. | |
823 | |
824 // Otherwise just OR them bits. | |
825 return TypeLong::make( r0->get_con() ^ r1->get_con() ); | |
826 } | |
827 | |
828 //============================================================================= | |
829 //------------------------------add_ring--------------------------------------- | |
830 // Supplied function returns the sum of the inputs. | |
831 const Type *MaxINode::add_ring( const Type *t0, const Type *t1 ) const { | |
832 const TypeInt *r0 = t0->is_int(); // Handy access | |
833 const TypeInt *r1 = t1->is_int(); | |
834 | |
835 // Otherwise just MAX them bits. | |
836 return TypeInt::make( MAX2(r0->_lo,r1->_lo), MAX2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
837 } | |
838 | |
839 //============================================================================= | |
840 //------------------------------Idealize--------------------------------------- | |
841 // MINs show up in range-check loop limit calculations. Look for | |
842 // "MIN2(x+c0,MIN2(y,x+c1))". Pick the smaller constant: "MIN2(x+c0,y)" | |
843 Node *MinINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
844 Node *progress = NULL; | |
845 // Force a right-spline graph | |
846 Node *l = in(1); | |
847 Node *r = in(2); | |
848 // Transform MinI1( MinI2(a,b), c) into MinI1( a, MinI2(b,c) ) | |
849 // to force a right-spline graph for the rest of MinINode::Ideal(). | |
850 if( l->Opcode() == Op_MinI ) { | |
851 assert( l != l->in(1), "dead loop in MinINode::Ideal" ); | |
852 r = phase->transform(new (phase->C, 3) MinINode(l->in(2),r)); | |
853 l = l->in(1); | |
854 set_req(1, l); | |
855 set_req(2, r); | |
856 return this; | |
857 } | |
858 | |
859 // Get left input & constant | |
860 Node *x = l; | |
861 int x_off = 0; | |
862 if( x->Opcode() == Op_AddI && // Check for "x+c0" and collect constant | |
863 x->in(2)->is_Con() ) { | |
864 const Type *t = x->in(2)->bottom_type(); | |
865 if( t == Type::TOP ) return NULL; // No progress | |
866 x_off = t->is_int()->get_con(); | |
867 x = x->in(1); | |
868 } | |
869 | |
870 // Scan a right-spline-tree for MINs | |
871 Node *y = r; | |
872 int y_off = 0; | |
873 // Check final part of MIN tree | |
874 if( y->Opcode() == Op_AddI && // Check for "y+c1" and collect constant | |
875 y->in(2)->is_Con() ) { | |
876 const Type *t = y->in(2)->bottom_type(); | |
877 if( t == Type::TOP ) return NULL; // No progress | |
878 y_off = t->is_int()->get_con(); | |
879 y = y->in(1); | |
880 } | |
881 if( x->_idx > y->_idx && r->Opcode() != Op_MinI ) { | |
882 swap_edges(1, 2); | |
883 return this; | |
884 } | |
885 | |
886 | |
887 if( r->Opcode() == Op_MinI ) { | |
888 assert( r != r->in(2), "dead loop in MinINode::Ideal" ); | |
889 y = r->in(1); | |
890 // Check final part of MIN tree | |
891 if( y->Opcode() == Op_AddI &&// Check for "y+c1" and collect constant | |
892 y->in(2)->is_Con() ) { | |
893 const Type *t = y->in(2)->bottom_type(); | |
894 if( t == Type::TOP ) return NULL; // No progress | |
895 y_off = t->is_int()->get_con(); | |
896 y = y->in(1); | |
897 } | |
898 | |
899 if( x->_idx > y->_idx ) | |
900 return new (phase->C, 3) MinINode(r->in(1),phase->transform(new (phase->C, 3) MinINode(l,r->in(2)))); | |
901 | |
902 // See if covers: MIN2(x+c0,MIN2(y+c1,z)) | |
903 if( !phase->eqv(x,y) ) return NULL; | |
904 // If (y == x) transform MIN2(x+c0, MIN2(x+c1,z)) into | |
905 // MIN2(x+c0 or x+c1 which less, z). | |
906 return new (phase->C, 3) MinINode(phase->transform(new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off)))),r->in(2)); | |
907 } else { | |
908 // See if covers: MIN2(x+c0,y+c1) | |
909 if( !phase->eqv(x,y) ) return NULL; | |
910 // If (y == x) transform MIN2(x+c0,x+c1) into x+c0 or x+c1 which less. | |
911 return new (phase->C, 3) AddINode(x,phase->intcon(MIN2(x_off,y_off))); | |
912 } | |
913 | |
914 } | |
915 | |
916 //------------------------------add_ring--------------------------------------- | |
917 // Supplied function returns the sum of the inputs. | |
918 const Type *MinINode::add_ring( const Type *t0, const Type *t1 ) const { | |
919 const TypeInt *r0 = t0->is_int(); // Handy access | |
920 const TypeInt *r1 = t1->is_int(); | |
921 | |
922 // Otherwise just MIN them bits. | |
923 return TypeInt::make( MIN2(r0->_lo,r1->_lo), MIN2(r0->_hi,r1->_hi), MAX2(r0->_widen,r1->_widen) ); | |
924 } |