Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/subnode.cpp @ 145:f3de1255b035
6603011: RFE: Optimize long division
Summary: Transform long division by constant into multiply
Reviewed-by: never, kvn
author | rasbold |
---|---|
date | Wed, 07 May 2008 08:06:46 -0700 |
parents | ba764ed4b6f2 |
children | d1605aabd0a1 99bf1609e2a5 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved. | |
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Portions of code courtesy of Clifford Click | |
26 | |
27 // Optimization - Graph Style | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_subnode.cpp.incl" | |
31 #include "math.h" | |
32 | |
33 //============================================================================= | |
34 //------------------------------Identity--------------------------------------- | |
35 // If right input is a constant 0, return the left input. | |
36 Node *SubNode::Identity( PhaseTransform *phase ) { | |
37 assert(in(1) != this, "Must already have called Value"); | |
38 assert(in(2) != this, "Must already have called Value"); | |
39 | |
40 // Remove double negation | |
41 const Type *zero = add_id(); | |
42 if( phase->type( in(1) )->higher_equal( zero ) && | |
43 in(2)->Opcode() == Opcode() && | |
44 phase->type( in(2)->in(1) )->higher_equal( zero ) ) { | |
45 return in(2)->in(2); | |
46 } | |
47 | |
48 // Convert "(X+Y) - Y" into X | |
49 if( in(1)->Opcode() == Op_AddI ) { | |
50 if( phase->eqv(in(1)->in(2),in(2)) ) | |
51 return in(1)->in(1); | |
52 // Also catch: "(X + Opaque2(Y)) - Y". In this case, 'Y' is a loop-varying | |
53 // trip counter and X is likely to be loop-invariant (that's how O2 Nodes | |
54 // are originally used, although the optimizer sometimes jiggers things). | |
55 // This folding through an O2 removes a loop-exit use of a loop-varying | |
56 // value and generally lowers register pressure in and around the loop. | |
57 if( in(1)->in(2)->Opcode() == Op_Opaque2 && | |
58 phase->eqv(in(1)->in(2)->in(1),in(2)) ) | |
59 return in(1)->in(1); | |
60 } | |
61 | |
62 return ( phase->type( in(2) )->higher_equal( zero ) ) ? in(1) : this; | |
63 } | |
64 | |
65 //------------------------------Value------------------------------------------ | |
66 // A subtract node differences it's two inputs. | |
67 const Type *SubNode::Value( PhaseTransform *phase ) const { | |
68 const Node* in1 = in(1); | |
69 const Node* in2 = in(2); | |
70 // Either input is TOP ==> the result is TOP | |
71 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
72 if( t1 == Type::TOP ) return Type::TOP; | |
73 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
74 if( t2 == Type::TOP ) return Type::TOP; | |
75 | |
76 // Not correct for SubFnode and AddFNode (must check for infinity) | |
77 // Equal? Subtract is zero | |
78 if (phase->eqv_uncast(in1, in2)) return add_id(); | |
79 | |
80 // Either input is BOTTOM ==> the result is the local BOTTOM | |
81 if( t1 == Type::BOTTOM || t2 == Type::BOTTOM ) | |
82 return bottom_type(); | |
83 | |
84 return sub(t1,t2); // Local flavor of type subtraction | |
85 | |
86 } | |
87 | |
88 //============================================================================= | |
89 | |
90 //------------------------------Helper function-------------------------------- | |
91 static bool ok_to_convert(Node* inc, Node* iv) { | |
92 // Do not collapse (x+c0)-y if "+" is a loop increment, because the | |
93 // "-" is loop invariant and collapsing extends the live-range of "x" | |
94 // to overlap with the "+", forcing another register to be used in | |
95 // the loop. | |
96 // This test will be clearer with '&&' (apply DeMorgan's rule) | |
97 // but I like the early cutouts that happen here. | |
98 const PhiNode *phi; | |
99 if( ( !inc->in(1)->is_Phi() || | |
100 !(phi=inc->in(1)->as_Phi()) || | |
101 phi->is_copy() || | |
102 !phi->region()->is_CountedLoop() || | |
103 inc != phi->region()->as_CountedLoop()->incr() ) | |
104 && | |
105 // Do not collapse (x+c0)-iv if "iv" is a loop induction variable, | |
106 // because "x" maybe invariant. | |
107 ( !iv->is_loop_iv() ) | |
108 ) { | |
109 return true; | |
110 } else { | |
111 return false; | |
112 } | |
113 } | |
114 //------------------------------Ideal------------------------------------------ | |
115 Node *SubINode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
116 Node *in1 = in(1); | |
117 Node *in2 = in(2); | |
118 uint op1 = in1->Opcode(); | |
119 uint op2 = in2->Opcode(); | |
120 | |
121 #ifdef ASSERT | |
122 // Check for dead loop | |
123 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
124 ( op1 == Op_AddI || op1 == Op_SubI ) && | |
125 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
126 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
127 assert(false, "dead loop in SubINode::Ideal"); | |
128 #endif | |
129 | |
130 const Type *t2 = phase->type( in2 ); | |
131 if( t2 == Type::TOP ) return NULL; | |
132 // Convert "x-c0" into "x+ -c0". | |
133 if( t2->base() == Type::Int ){ // Might be bottom or top... | |
134 const TypeInt *i = t2->is_int(); | |
135 if( i->is_con() ) | |
136 return new (phase->C, 3) AddINode(in1, phase->intcon(-i->get_con())); | |
137 } | |
138 | |
139 // Convert "(x+c0) - y" into (x-y) + c0" | |
140 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
141 // if "y" is a loop induction variable. | |
142 if( op1 == Op_AddI && ok_to_convert(in1, in2) ) { | |
143 const Type *tadd = phase->type( in1->in(2) ); | |
144 if( tadd->singleton() && tadd != Type::TOP ) { | |
145 Node *sub2 = phase->transform( new (phase->C, 3) SubINode( in1->in(1), in2 )); | |
146 return new (phase->C, 3) AddINode( sub2, in1->in(2) ); | |
147 } | |
148 } | |
149 | |
150 | |
151 // Convert "x - (y+c0)" into "(x-y) - c0" | |
152 // Need the same check as in above optimization but reversed. | |
153 if (op2 == Op_AddI && ok_to_convert(in2, in1)) { | |
154 Node* in21 = in2->in(1); | |
155 Node* in22 = in2->in(2); | |
156 const TypeInt* tcon = phase->type(in22)->isa_int(); | |
157 if (tcon != NULL && tcon->is_con()) { | |
158 Node* sub2 = phase->transform( new (phase->C, 3) SubINode(in1, in21) ); | |
159 Node* neg_c0 = phase->intcon(- tcon->get_con()); | |
160 return new (phase->C, 3) AddINode(sub2, neg_c0); | |
161 } | |
162 } | |
163 | |
164 const Type *t1 = phase->type( in1 ); | |
165 if( t1 == Type::TOP ) return NULL; | |
166 | |
167 #ifdef ASSERT | |
168 // Check for dead loop | |
169 if( ( op2 == Op_AddI || op2 == Op_SubI ) && | |
170 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
171 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
172 assert(false, "dead loop in SubINode::Ideal"); | |
173 #endif | |
174 | |
175 // Convert "x - (x+y)" into "-y" | |
176 if( op2 == Op_AddI && | |
177 phase->eqv( in1, in2->in(1) ) ) | |
178 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(2)); | |
179 // Convert "(x-y) - x" into "-y" | |
180 if( op1 == Op_SubI && | |
181 phase->eqv( in1->in(1), in2 ) ) | |
182 return new (phase->C, 3) SubINode( phase->intcon(0),in1->in(2)); | |
183 // Convert "x - (y+x)" into "-y" | |
184 if( op2 == Op_AddI && | |
185 phase->eqv( in1, in2->in(2) ) ) | |
186 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(1)); | |
187 | |
188 // Convert "0 - (x-y)" into "y-x" | |
189 if( t1 == TypeInt::ZERO && op2 == Op_SubI ) | |
190 return new (phase->C, 3) SubINode( in2->in(2), in2->in(1) ); | |
191 | |
192 // Convert "0 - (x+con)" into "-con-x" | |
193 jint con; | |
194 if( t1 == TypeInt::ZERO && op2 == Op_AddI && | |
195 (con = in2->in(2)->find_int_con(0)) != 0 ) | |
196 return new (phase->C, 3) SubINode( phase->intcon(-con), in2->in(1) ); | |
197 | |
198 // Convert "(X+A) - (X+B)" into "A - B" | |
199 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(1) ) | |
200 return new (phase->C, 3) SubINode( in1->in(2), in2->in(2) ); | |
201 | |
202 // Convert "(A+X) - (B+X)" into "A - B" | |
203 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) ) | |
204 return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) ); | |
205 | |
206 // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally | |
207 // nicer to optimize than subtract. | |
208 if( op2 == Op_SubI && in2->outcnt() == 1) { | |
209 Node *add1 = phase->transform( new (phase->C, 3) AddINode( in1, in2->in(2) ) ); | |
210 return new (phase->C, 3) SubINode( add1, in2->in(1) ); | |
211 } | |
212 | |
213 return NULL; | |
214 } | |
215 | |
216 //------------------------------sub-------------------------------------------- | |
217 // A subtract node differences it's two inputs. | |
218 const Type *SubINode::sub( const Type *t1, const Type *t2 ) const { | |
219 const TypeInt *r0 = t1->is_int(); // Handy access | |
220 const TypeInt *r1 = t2->is_int(); | |
221 int32 lo = r0->_lo - r1->_hi; | |
222 int32 hi = r0->_hi - r1->_lo; | |
223 | |
224 // We next check for 32-bit overflow. | |
225 // If that happens, we just assume all integers are possible. | |
226 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
227 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
228 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
229 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
230 return TypeInt::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
231 else // Overflow; assume all integers | |
232 return TypeInt::INT; | |
233 } | |
234 | |
235 //============================================================================= | |
236 //------------------------------Ideal------------------------------------------ | |
237 Node *SubLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
238 Node *in1 = in(1); | |
239 Node *in2 = in(2); | |
240 uint op1 = in1->Opcode(); | |
241 uint op2 = in2->Opcode(); | |
242 | |
243 #ifdef ASSERT | |
244 // Check for dead loop | |
245 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) || | |
246 ( op1 == Op_AddL || op1 == Op_SubL ) && | |
247 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) || | |
248 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) ) | |
249 assert(false, "dead loop in SubLNode::Ideal"); | |
250 #endif | |
251 | |
252 if( phase->type( in2 ) == Type::TOP ) return NULL; | |
253 const TypeLong *i = phase->type( in2 )->isa_long(); | |
254 // Convert "x-c0" into "x+ -c0". | |
255 if( i && // Might be bottom or top... | |
256 i->is_con() ) | |
257 return new (phase->C, 3) AddLNode(in1, phase->longcon(-i->get_con())); | |
258 | |
259 // Convert "(x+c0) - y" into (x-y) + c0" | |
260 // Do not collapse (x+c0)-y if "+" is a loop increment or | |
261 // if "y" is a loop induction variable. | |
262 if( op1 == Op_AddL && ok_to_convert(in1, in2) ) { | |
263 Node *in11 = in1->in(1); | |
264 const Type *tadd = phase->type( in1->in(2) ); | |
265 if( tadd->singleton() && tadd != Type::TOP ) { | |
266 Node *sub2 = phase->transform( new (phase->C, 3) SubLNode( in11, in2 )); | |
267 return new (phase->C, 3) AddLNode( sub2, in1->in(2) ); | |
268 } | |
269 } | |
270 | |
271 // Convert "x - (y+c0)" into "(x-y) - c0" | |
272 // Need the same check as in above optimization but reversed. | |
273 if (op2 == Op_AddL && ok_to_convert(in2, in1)) { | |
274 Node* in21 = in2->in(1); | |
275 Node* in22 = in2->in(2); | |
276 const TypeLong* tcon = phase->type(in22)->isa_long(); | |
277 if (tcon != NULL && tcon->is_con()) { | |
278 Node* sub2 = phase->transform( new (phase->C, 3) SubLNode(in1, in21) ); | |
279 Node* neg_c0 = phase->longcon(- tcon->get_con()); | |
280 return new (phase->C, 3) AddLNode(sub2, neg_c0); | |
281 } | |
282 } | |
283 | |
284 const Type *t1 = phase->type( in1 ); | |
285 if( t1 == Type::TOP ) return NULL; | |
286 | |
287 #ifdef ASSERT | |
288 // Check for dead loop | |
289 if( ( op2 == Op_AddL || op2 == Op_SubL ) && | |
290 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) || | |
291 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) ) | |
292 assert(false, "dead loop in SubLNode::Ideal"); | |
293 #endif | |
294 | |
295 // Convert "x - (x+y)" into "-y" | |
296 if( op2 == Op_AddL && | |
297 phase->eqv( in1, in2->in(1) ) ) | |
298 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO), in2->in(2)); | |
299 // Convert "x - (y+x)" into "-y" | |
300 if( op2 == Op_AddL && | |
301 phase->eqv( in1, in2->in(2) ) ) | |
302 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO),in2->in(1)); | |
303 | |
304 // Convert "0 - (x-y)" into "y-x" | |
305 if( phase->type( in1 ) == TypeLong::ZERO && op2 == Op_SubL ) | |
306 return new (phase->C, 3) SubLNode( in2->in(2), in2->in(1) ); | |
307 | |
308 // Convert "(X+A) - (X+B)" into "A - B" | |
309 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(1) == in2->in(1) ) | |
310 return new (phase->C, 3) SubLNode( in1->in(2), in2->in(2) ); | |
311 | |
312 // Convert "(A+X) - (B+X)" into "A - B" | |
313 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(2) == in2->in(2) ) | |
314 return new (phase->C, 3) SubLNode( in1->in(1), in2->in(1) ); | |
315 | |
316 // Convert "A-(B-C)" into (A+C)-B" | |
317 if( op2 == Op_SubL && in2->outcnt() == 1) { | |
318 Node *add1 = phase->transform( new (phase->C, 3) AddLNode( in1, in2->in(2) ) ); | |
319 return new (phase->C, 3) SubLNode( add1, in2->in(1) ); | |
320 } | |
321 | |
322 return NULL; | |
323 } | |
324 | |
325 //------------------------------sub-------------------------------------------- | |
326 // A subtract node differences it's two inputs. | |
327 const Type *SubLNode::sub( const Type *t1, const Type *t2 ) const { | |
328 const TypeLong *r0 = t1->is_long(); // Handy access | |
329 const TypeLong *r1 = t2->is_long(); | |
330 jlong lo = r0->_lo - r1->_hi; | |
331 jlong hi = r0->_hi - r1->_lo; | |
332 | |
333 // We next check for 32-bit overflow. | |
334 // If that happens, we just assume all integers are possible. | |
335 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR | |
336 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND | |
337 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR | |
338 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs | |
339 return TypeLong::make(lo,hi,MAX2(r0->_widen,r1->_widen)); | |
340 else // Overflow; assume all integers | |
341 return TypeLong::LONG; | |
342 } | |
343 | |
344 //============================================================================= | |
345 //------------------------------Value------------------------------------------ | |
346 // A subtract node differences its two inputs. | |
347 const Type *SubFPNode::Value( PhaseTransform *phase ) const { | |
348 const Node* in1 = in(1); | |
349 const Node* in2 = in(2); | |
350 // Either input is TOP ==> the result is TOP | |
351 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
352 if( t1 == Type::TOP ) return Type::TOP; | |
353 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
354 if( t2 == Type::TOP ) return Type::TOP; | |
355 | |
356 // if both operands are infinity of same sign, the result is NaN; do | |
357 // not replace with zero | |
358 if( (t1->is_finite() && t2->is_finite()) ) { | |
359 if( phase->eqv(in1, in2) ) return add_id(); | |
360 } | |
361 | |
362 // Either input is BOTTOM ==> the result is the local BOTTOM | |
363 const Type *bot = bottom_type(); | |
364 if( (t1 == bot) || (t2 == bot) || | |
365 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
366 return bot; | |
367 | |
368 return sub(t1,t2); // Local flavor of type subtraction | |
369 } | |
370 | |
371 | |
372 //============================================================================= | |
373 //------------------------------Ideal------------------------------------------ | |
374 Node *SubFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
375 const Type *t2 = phase->type( in(2) ); | |
376 // Convert "x-c0" into "x+ -c0". | |
377 if( t2->base() == Type::FloatCon ) { // Might be bottom or top... | |
378 // return new (phase->C, 3) AddFNode(in(1), phase->makecon( TypeF::make(-t2->getf()) ) ); | |
379 } | |
380 | |
381 // Not associative because of boundary conditions (infinity) | |
382 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
383 // Convert "x - (x+y)" into "-y" | |
384 if( in(2)->is_Add() && | |
385 phase->eqv(in(1),in(2)->in(1) ) ) | |
386 return new (phase->C, 3) SubFNode( phase->makecon(TypeF::ZERO),in(2)->in(2)); | |
387 } | |
388 | |
389 // Cannot replace 0.0-X with -X because a 'fsub' bytecode computes | |
390 // 0.0-0.0 as +0.0, while a 'fneg' bytecode computes -0.0. | |
391 //if( phase->type(in(1)) == TypeF::ZERO ) | |
392 //return new (phase->C, 2) NegFNode(in(2)); | |
393 | |
394 return NULL; | |
395 } | |
396 | |
397 //------------------------------sub-------------------------------------------- | |
398 // A subtract node differences its two inputs. | |
399 const Type *SubFNode::sub( const Type *t1, const Type *t2 ) const { | |
400 // no folding if one of operands is infinity or NaN, do not do constant folding | |
401 if( g_isfinite(t1->getf()) && g_isfinite(t2->getf()) ) { | |
402 return TypeF::make( t1->getf() - t2->getf() ); | |
403 } | |
404 else if( g_isnan(t1->getf()) ) { | |
405 return t1; | |
406 } | |
407 else if( g_isnan(t2->getf()) ) { | |
408 return t2; | |
409 } | |
410 else { | |
411 return Type::FLOAT; | |
412 } | |
413 } | |
414 | |
415 //============================================================================= | |
416 //------------------------------Ideal------------------------------------------ | |
417 Node *SubDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
418 const Type *t2 = phase->type( in(2) ); | |
419 // Convert "x-c0" into "x+ -c0". | |
420 if( t2->base() == Type::DoubleCon ) { // Might be bottom or top... | |
421 // return new (phase->C, 3) AddDNode(in(1), phase->makecon( TypeD::make(-t2->getd()) ) ); | |
422 } | |
423 | |
424 // Not associative because of boundary conditions (infinity) | |
425 if( IdealizedNumerics && !phase->C->method()->is_strict() ) { | |
426 // Convert "x - (x+y)" into "-y" | |
427 if( in(2)->is_Add() && | |
428 phase->eqv(in(1),in(2)->in(1) ) ) | |
429 return new (phase->C, 3) SubDNode( phase->makecon(TypeD::ZERO),in(2)->in(2)); | |
430 } | |
431 | |
432 // Cannot replace 0.0-X with -X because a 'dsub' bytecode computes | |
433 // 0.0-0.0 as +0.0, while a 'dneg' bytecode computes -0.0. | |
434 //if( phase->type(in(1)) == TypeD::ZERO ) | |
435 //return new (phase->C, 2) NegDNode(in(2)); | |
436 | |
437 return NULL; | |
438 } | |
439 | |
440 //------------------------------sub-------------------------------------------- | |
441 // A subtract node differences its two inputs. | |
442 const Type *SubDNode::sub( const Type *t1, const Type *t2 ) const { | |
443 // no folding if one of operands is infinity or NaN, do not do constant folding | |
444 if( g_isfinite(t1->getd()) && g_isfinite(t2->getd()) ) { | |
445 return TypeD::make( t1->getd() - t2->getd() ); | |
446 } | |
447 else if( g_isnan(t1->getd()) ) { | |
448 return t1; | |
449 } | |
450 else if( g_isnan(t2->getd()) ) { | |
451 return t2; | |
452 } | |
453 else { | |
454 return Type::DOUBLE; | |
455 } | |
456 } | |
457 | |
458 //============================================================================= | |
459 //------------------------------Idealize--------------------------------------- | |
460 // Unlike SubNodes, compare must still flatten return value to the | |
461 // range -1, 0, 1. | |
462 // And optimizations like those for (X + Y) - X fail if overflow happens. | |
463 Node *CmpNode::Identity( PhaseTransform *phase ) { | |
464 return this; | |
465 } | |
466 | |
467 //============================================================================= | |
468 //------------------------------cmp-------------------------------------------- | |
469 // Simplify a CmpI (compare 2 integers) node, based on local information. | |
470 // If both inputs are constants, compare them. | |
471 const Type *CmpINode::sub( const Type *t1, const Type *t2 ) const { | |
472 const TypeInt *r0 = t1->is_int(); // Handy access | |
473 const TypeInt *r1 = t2->is_int(); | |
474 | |
475 if( r0->_hi < r1->_lo ) // Range is always low? | |
476 return TypeInt::CC_LT; | |
477 else if( r0->_lo > r1->_hi ) // Range is always high? | |
478 return TypeInt::CC_GT; | |
479 | |
480 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
481 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
482 return TypeInt::CC_EQ; // Equal results. | |
483 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
484 return TypeInt::CC_LE; | |
485 else if( r0->_lo == r1->_hi ) // Range is never low? | |
486 return TypeInt::CC_GE; | |
487 return TypeInt::CC; // else use worst case results | |
488 } | |
489 | |
490 // Simplify a CmpU (compare 2 integers) node, based on local information. | |
491 // If both inputs are constants, compare them. | |
492 const Type *CmpUNode::sub( const Type *t1, const Type *t2 ) const { | |
493 assert(!t1->isa_ptr(), "obsolete usage of CmpU"); | |
494 | |
495 // comparing two unsigned ints | |
496 const TypeInt *r0 = t1->is_int(); // Handy access | |
497 const TypeInt *r1 = t2->is_int(); | |
498 | |
499 // Current installed version | |
500 // Compare ranges for non-overlap | |
501 juint lo0 = r0->_lo; | |
502 juint hi0 = r0->_hi; | |
503 juint lo1 = r1->_lo; | |
504 juint hi1 = r1->_hi; | |
505 | |
506 // If either one has both negative and positive values, | |
507 // it therefore contains both 0 and -1, and since [0..-1] is the | |
508 // full unsigned range, the type must act as an unsigned bottom. | |
509 bool bot0 = ((jint)(lo0 ^ hi0) < 0); | |
510 bool bot1 = ((jint)(lo1 ^ hi1) < 0); | |
511 | |
512 if (bot0 || bot1) { | |
513 // All unsigned values are LE -1 and GE 0. | |
514 if (lo0 == 0 && hi0 == 0) { | |
515 return TypeInt::CC_LE; // 0 <= bot | |
516 } else if (lo1 == 0 && hi1 == 0) { | |
517 return TypeInt::CC_GE; // bot >= 0 | |
518 } | |
519 } else { | |
520 // We can use ranges of the form [lo..hi] if signs are the same. | |
521 assert(lo0 <= hi0 && lo1 <= hi1, "unsigned ranges are valid"); | |
522 // results are reversed, '-' > '+' for unsigned compare | |
523 if (hi0 < lo1) { | |
524 return TypeInt::CC_LT; // smaller | |
525 } else if (lo0 > hi1) { | |
526 return TypeInt::CC_GT; // greater | |
527 } else if (hi0 == lo1 && lo0 == hi1) { | |
528 return TypeInt::CC_EQ; // Equal results | |
529 } else if (lo0 >= hi1) { | |
530 return TypeInt::CC_GE; | |
531 } else if (hi0 <= lo1) { | |
532 // Check for special case in Hashtable::get. (See below.) | |
533 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && | |
534 in(1)->Opcode() == Op_ModI && | |
535 in(1)->in(2) == in(2) ) | |
536 return TypeInt::CC_LT; | |
537 return TypeInt::CC_LE; | |
538 } | |
539 } | |
540 // Check for special case in Hashtable::get - the hash index is | |
541 // mod'ed to the table size so the following range check is useless. | |
542 // Check for: (X Mod Y) CmpU Y, where the mod result and Y both have | |
543 // to be positive. | |
544 // (This is a gross hack, since the sub method never | |
545 // looks at the structure of the node in any other case.) | |
546 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && | |
547 in(1)->Opcode() == Op_ModI && | |
548 in(1)->in(2)->uncast() == in(2)->uncast()) | |
549 return TypeInt::CC_LT; | |
550 return TypeInt::CC; // else use worst case results | |
551 } | |
552 | |
553 //------------------------------Idealize--------------------------------------- | |
554 Node *CmpINode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
555 if (phase->type(in(2))->higher_equal(TypeInt::ZERO)) { | |
556 switch (in(1)->Opcode()) { | |
557 case Op_CmpL3: // Collapse a CmpL3/CmpI into a CmpL | |
558 return new (phase->C, 3) CmpLNode(in(1)->in(1),in(1)->in(2)); | |
559 case Op_CmpF3: // Collapse a CmpF3/CmpI into a CmpF | |
560 return new (phase->C, 3) CmpFNode(in(1)->in(1),in(1)->in(2)); | |
561 case Op_CmpD3: // Collapse a CmpD3/CmpI into a CmpD | |
562 return new (phase->C, 3) CmpDNode(in(1)->in(1),in(1)->in(2)); | |
563 //case Op_SubI: | |
564 // If (x - y) cannot overflow, then ((x - y) <?> 0) | |
565 // can be turned into (x <?> y). | |
566 // This is handled (with more general cases) by Ideal_sub_algebra. | |
567 } | |
568 } | |
569 return NULL; // No change | |
570 } | |
571 | |
572 | |
573 //============================================================================= | |
574 // Simplify a CmpL (compare 2 longs ) node, based on local information. | |
575 // If both inputs are constants, compare them. | |
576 const Type *CmpLNode::sub( const Type *t1, const Type *t2 ) const { | |
577 const TypeLong *r0 = t1->is_long(); // Handy access | |
578 const TypeLong *r1 = t2->is_long(); | |
579 | |
580 if( r0->_hi < r1->_lo ) // Range is always low? | |
581 return TypeInt::CC_LT; | |
582 else if( r0->_lo > r1->_hi ) // Range is always high? | |
583 return TypeInt::CC_GT; | |
584 | |
585 else if( r0->is_con() && r1->is_con() ) { // comparing constants? | |
586 assert(r0->get_con() == r1->get_con(), "must be equal"); | |
587 return TypeInt::CC_EQ; // Equal results. | |
588 } else if( r0->_hi == r1->_lo ) // Range is never high? | |
589 return TypeInt::CC_LE; | |
590 else if( r0->_lo == r1->_hi ) // Range is never low? | |
591 return TypeInt::CC_GE; | |
592 return TypeInt::CC; // else use worst case results | |
593 } | |
594 | |
595 //============================================================================= | |
596 //------------------------------sub-------------------------------------------- | |
597 // Simplify an CmpP (compare 2 pointers) node, based on local information. | |
598 // If both inputs are constants, compare them. | |
599 const Type *CmpPNode::sub( const Type *t1, const Type *t2 ) const { | |
600 const TypePtr *r0 = t1->is_ptr(); // Handy access | |
601 const TypePtr *r1 = t2->is_ptr(); | |
602 | |
603 // Undefined inputs makes for an undefined result | |
604 if( TypePtr::above_centerline(r0->_ptr) || | |
605 TypePtr::above_centerline(r1->_ptr) ) | |
606 return Type::TOP; | |
607 | |
608 if (r0 == r1 && r0->singleton()) { | |
609 // Equal pointer constants (klasses, nulls, etc.) | |
610 return TypeInt::CC_EQ; | |
611 } | |
612 | |
613 // See if it is 2 unrelated classes. | |
614 const TypeOopPtr* p0 = r0->isa_oopptr(); | |
615 const TypeOopPtr* p1 = r1->isa_oopptr(); | |
616 if (p0 && p1) { | |
33 | 617 Node* in1 = in(1)->uncast(); |
618 Node* in2 = in(2)->uncast(); | |
619 AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL); | |
620 AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL); | |
621 if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) { | |
622 return TypeInt::CC_GT; // different pointers | |
623 } | |
0 | 624 ciKlass* klass0 = p0->klass(); |
625 bool xklass0 = p0->klass_is_exact(); | |
626 ciKlass* klass1 = p1->klass(); | |
627 bool xklass1 = p1->klass_is_exact(); | |
628 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); | |
629 if (klass0 && klass1 && | |
630 kps != 1 && // both or neither are klass pointers | |
631 !klass0->is_interface() && // do not trust interfaces | |
632 !klass1->is_interface()) { | |
633 // See if neither subclasses the other, or if the class on top | |
634 // is precise. In either of these cases, the compare must fail. | |
635 if (klass0->equals(klass1) || // if types are unequal but klasses are | |
636 !klass0->is_java_klass() || // types not part of Java language? | |
637 !klass1->is_java_klass()) { // types not part of Java language? | |
638 // Do nothing; we know nothing for imprecise types | |
639 } else if (klass0->is_subtype_of(klass1)) { | |
640 // If klass1's type is PRECISE, then we can fail. | |
641 if (xklass1) return TypeInt::CC_GT; | |
642 } else if (klass1->is_subtype_of(klass0)) { | |
643 // If klass0's type is PRECISE, then we can fail. | |
644 if (xklass0) return TypeInt::CC_GT; | |
645 } else { // Neither subtypes the other | |
646 return TypeInt::CC_GT; // ...so always fail | |
647 } | |
648 } | |
649 } | |
650 | |
651 // Known constants can be compared exactly | |
652 // Null can be distinguished from any NotNull pointers | |
653 // Unknown inputs makes an unknown result | |
654 if( r0->singleton() ) { | |
655 intptr_t bits0 = r0->get_con(); | |
656 if( r1->singleton() ) | |
657 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; | |
658 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
659 } else if( r1->singleton() ) { | |
660 intptr_t bits1 = r1->get_con(); | |
661 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; | |
662 } else | |
663 return TypeInt::CC; | |
664 } | |
665 | |
666 //------------------------------Ideal------------------------------------------ | |
667 // Check for the case of comparing an unknown klass loaded from the primary | |
668 // super-type array vs a known klass with no subtypes. This amounts to | |
669 // checking to see an unknown klass subtypes a known klass with no subtypes; | |
670 // this only happens on an exact match. We can shorten this test by 1 load. | |
671 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) { | |
672 // Constant pointer on right? | |
673 const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr(); | |
674 if (t2 == NULL || !t2->klass_is_exact()) | |
675 return NULL; | |
676 // Get the constant klass we are comparing to. | |
677 ciKlass* superklass = t2->klass(); | |
678 | |
679 // Now check for LoadKlass on left. | |
680 Node* ldk1 = in(1); | |
681 if (ldk1->Opcode() != Op_LoadKlass) | |
682 return NULL; | |
683 // Take apart the address of the LoadKlass: | |
684 Node* adr1 = ldk1->in(MemNode::Address); | |
685 intptr_t con2 = 0; | |
686 Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2); | |
687 if (ldk2 == NULL) | |
688 return NULL; | |
689 if (con2 == oopDesc::klass_offset_in_bytes()) { | |
690 // We are inspecting an object's concrete class. | |
691 // Short-circuit the check if the query is abstract. | |
692 if (superklass->is_interface() || | |
693 superklass->is_abstract()) { | |
694 // Make it come out always false: | |
695 this->set_req(2, phase->makecon(TypePtr::NULL_PTR)); | |
696 return this; | |
697 } | |
698 } | |
699 | |
700 // Check for a LoadKlass from primary supertype array. | |
701 // Any nested loadklass from loadklass+con must be from the p.s. array. | |
702 if (ldk2->Opcode() != Op_LoadKlass) | |
703 return NULL; | |
704 | |
705 // Verify that we understand the situation | |
706 if (con2 != (intptr_t) superklass->super_check_offset()) | |
707 return NULL; // Might be element-klass loading from array klass | |
708 | |
709 // If 'superklass' has no subklasses and is not an interface, then we are | |
710 // assured that the only input which will pass the type check is | |
711 // 'superklass' itself. | |
712 // | |
713 // We could be more liberal here, and allow the optimization on interfaces | |
714 // which have a single implementor. This would require us to increase the | |
715 // expressiveness of the add_dependency() mechanism. | |
716 // %%% Do this after we fix TypeOopPtr: Deps are expressive enough now. | |
717 | |
718 // Object arrays must have their base element have no subtypes | |
719 while (superklass->is_obj_array_klass()) { | |
720 ciType* elem = superklass->as_obj_array_klass()->element_type(); | |
721 superklass = elem->as_klass(); | |
722 } | |
723 if (superklass->is_instance_klass()) { | |
724 ciInstanceKlass* ik = superklass->as_instance_klass(); | |
725 if (ik->has_subklass() || ik->is_interface()) return NULL; | |
726 // Add a dependency if there is a chance that a subclass will be added later. | |
727 if (!ik->is_final()) { | |
728 phase->C->dependencies()->assert_leaf_type(ik); | |
729 } | |
730 } | |
731 | |
732 // Bypass the dependent load, and compare directly | |
733 this->set_req(1,ldk2); | |
734 | |
735 return this; | |
736 } | |
737 | |
738 //============================================================================= | |
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739 //------------------------------sub-------------------------------------------- |
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740 // Simplify an CmpN (compare 2 pointers) node, based on local information. |
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741 // If both inputs are constants, compare them. |
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742 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const { |
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743 const TypePtr *r0 = t1->is_narrowoop()->make_oopptr(); // Handy access |
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744 const TypePtr *r1 = t2->is_narrowoop()->make_oopptr(); |
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745 |
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746 // Undefined inputs makes for an undefined result |
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747 if( TypePtr::above_centerline(r0->_ptr) || |
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748 TypePtr::above_centerline(r1->_ptr) ) |
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749 return Type::TOP; |
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750 |
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751 if (r0 == r1 && r0->singleton()) { |
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752 // Equal pointer constants (klasses, nulls, etc.) |
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753 return TypeInt::CC_EQ; |
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754 } |
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755 |
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756 // See if it is 2 unrelated classes. |
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757 const TypeOopPtr* p0 = r0->isa_oopptr(); |
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758 const TypeOopPtr* p1 = r1->isa_oopptr(); |
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759 if (p0 && p1) { |
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760 ciKlass* klass0 = p0->klass(); |
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761 bool xklass0 = p0->klass_is_exact(); |
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762 ciKlass* klass1 = p1->klass(); |
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763 bool xklass1 = p1->klass_is_exact(); |
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764 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0); |
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765 if (klass0 && klass1 && |
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766 kps != 1 && // both or neither are klass pointers |
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767 !klass0->is_interface() && // do not trust interfaces |
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768 !klass1->is_interface()) { |
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769 // See if neither subclasses the other, or if the class on top |
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770 // is precise. In either of these cases, the compare must fail. |
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771 if (klass0->equals(klass1) || // if types are unequal but klasses are |
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772 !klass0->is_java_klass() || // types not part of Java language? |
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773 !klass1->is_java_klass()) { // types not part of Java language? |
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774 // Do nothing; we know nothing for imprecise types |
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775 } else if (klass0->is_subtype_of(klass1)) { |
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776 // If klass1's type is PRECISE, then we can fail. |
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777 if (xklass1) return TypeInt::CC_GT; |
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778 } else if (klass1->is_subtype_of(klass0)) { |
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779 // If klass0's type is PRECISE, then we can fail. |
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780 if (xklass0) return TypeInt::CC_GT; |
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781 } else { // Neither subtypes the other |
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782 return TypeInt::CC_GT; // ...so always fail |
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783 } |
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784 } |
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785 } |
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786 |
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787 // Known constants can be compared exactly |
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788 // Null can be distinguished from any NotNull pointers |
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789 // Unknown inputs makes an unknown result |
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790 if( r0->singleton() ) { |
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791 intptr_t bits0 = r0->get_con(); |
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792 if( r1->singleton() ) |
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793 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT; |
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794 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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795 } else if( r1->singleton() ) { |
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796 intptr_t bits1 = r1->get_con(); |
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797 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC; |
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798 } else |
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799 return TypeInt::CC; |
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800 } |
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801 |
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802 //------------------------------Ideal------------------------------------------ |
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803 Node *CmpNNode::Ideal( PhaseGVN *phase, bool can_reshape ) { |
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804 return NULL; |
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805 } |
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806 |
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807 //============================================================================= |
0 | 808 //------------------------------Value------------------------------------------ |
809 // Simplify an CmpF (compare 2 floats ) node, based on local information. | |
810 // If both inputs are constants, compare them. | |
811 const Type *CmpFNode::Value( PhaseTransform *phase ) const { | |
812 const Node* in1 = in(1); | |
813 const Node* in2 = in(2); | |
814 // Either input is TOP ==> the result is TOP | |
815 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
816 if( t1 == Type::TOP ) return Type::TOP; | |
817 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
818 if( t2 == Type::TOP ) return Type::TOP; | |
819 | |
820 // Not constants? Don't know squat - even if they are the same | |
821 // value! If they are NaN's they compare to LT instead of EQ. | |
822 const TypeF *tf1 = t1->isa_float_constant(); | |
823 const TypeF *tf2 = t2->isa_float_constant(); | |
824 if( !tf1 || !tf2 ) return TypeInt::CC; | |
825 | |
826 // This implements the Java bytecode fcmpl, so unordered returns -1. | |
827 if( tf1->is_nan() || tf2->is_nan() ) | |
828 return TypeInt::CC_LT; | |
829 | |
830 if( tf1->_f < tf2->_f ) return TypeInt::CC_LT; | |
831 if( tf1->_f > tf2->_f ) return TypeInt::CC_GT; | |
832 assert( tf1->_f == tf2->_f, "do not understand FP behavior" ); | |
833 return TypeInt::CC_EQ; | |
834 } | |
835 | |
836 | |
837 //============================================================================= | |
838 //------------------------------Value------------------------------------------ | |
839 // Simplify an CmpD (compare 2 doubles ) node, based on local information. | |
840 // If both inputs are constants, compare them. | |
841 const Type *CmpDNode::Value( PhaseTransform *phase ) const { | |
842 const Node* in1 = in(1); | |
843 const Node* in2 = in(2); | |
844 // Either input is TOP ==> the result is TOP | |
845 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1); | |
846 if( t1 == Type::TOP ) return Type::TOP; | |
847 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2); | |
848 if( t2 == Type::TOP ) return Type::TOP; | |
849 | |
850 // Not constants? Don't know squat - even if they are the same | |
851 // value! If they are NaN's they compare to LT instead of EQ. | |
852 const TypeD *td1 = t1->isa_double_constant(); | |
853 const TypeD *td2 = t2->isa_double_constant(); | |
854 if( !td1 || !td2 ) return TypeInt::CC; | |
855 | |
856 // This implements the Java bytecode dcmpl, so unordered returns -1. | |
857 if( td1->is_nan() || td2->is_nan() ) | |
858 return TypeInt::CC_LT; | |
859 | |
860 if( td1->_d < td2->_d ) return TypeInt::CC_LT; | |
861 if( td1->_d > td2->_d ) return TypeInt::CC_GT; | |
862 assert( td1->_d == td2->_d, "do not understand FP behavior" ); | |
863 return TypeInt::CC_EQ; | |
864 } | |
865 | |
866 //------------------------------Ideal------------------------------------------ | |
867 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){ | |
868 // Check if we can change this to a CmpF and remove a ConvD2F operation. | |
869 // Change (CMPD (F2D (float)) (ConD value)) | |
870 // To (CMPF (float) (ConF value)) | |
871 // Valid when 'value' does not lose precision as a float. | |
872 // Benefits: eliminates conversion, does not require 24-bit mode | |
873 | |
874 // NaNs prevent commuting operands. This transform works regardless of the | |
875 // order of ConD and ConvF2D inputs by preserving the original order. | |
876 int idx_f2d = 1; // ConvF2D on left side? | |
877 if( in(idx_f2d)->Opcode() != Op_ConvF2D ) | |
878 idx_f2d = 2; // No, swap to check for reversed args | |
879 int idx_con = 3-idx_f2d; // Check for the constant on other input | |
880 | |
881 if( ConvertCmpD2CmpF && | |
882 in(idx_f2d)->Opcode() == Op_ConvF2D && | |
883 in(idx_con)->Opcode() == Op_ConD ) { | |
884 const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant(); | |
885 double t2_value_as_double = t2->_d; | |
886 float t2_value_as_float = (float)t2_value_as_double; | |
887 if( t2_value_as_double == (double)t2_value_as_float ) { | |
888 // Test value can be represented as a float | |
889 // Eliminate the conversion to double and create new comparison | |
890 Node *new_in1 = in(idx_f2d)->in(1); | |
891 Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) ); | |
892 if( idx_f2d != 1 ) { // Must flip args to match original order | |
893 Node *tmp = new_in1; | |
894 new_in1 = new_in2; | |
895 new_in2 = tmp; | |
896 } | |
897 CmpFNode *new_cmp = (Opcode() == Op_CmpD3) | |
898 ? new (phase->C, 3) CmpF3Node( new_in1, new_in2 ) | |
899 : new (phase->C, 3) CmpFNode ( new_in1, new_in2 ) ; | |
900 return new_cmp; // Changed to CmpFNode | |
901 } | |
902 // Testing value required the precision of a double | |
903 } | |
904 return NULL; // No change | |
905 } | |
906 | |
907 | |
908 //============================================================================= | |
909 //------------------------------cc2logical------------------------------------- | |
910 // Convert a condition code type to a logical type | |
911 const Type *BoolTest::cc2logical( const Type *CC ) const { | |
912 if( CC == Type::TOP ) return Type::TOP; | |
913 if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse | |
914 const TypeInt *ti = CC->is_int(); | |
915 if( ti->is_con() ) { // Only 1 kind of condition codes set? | |
916 // Match low order 2 bits | |
917 int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0; | |
918 if( _test & 4 ) tmp = 1-tmp; // Optionally complement result | |
919 return TypeInt::make(tmp); // Boolean result | |
920 } | |
921 | |
922 if( CC == TypeInt::CC_GE ) { | |
923 if( _test == ge ) return TypeInt::ONE; | |
924 if( _test == lt ) return TypeInt::ZERO; | |
925 } | |
926 if( CC == TypeInt::CC_LE ) { | |
927 if( _test == le ) return TypeInt::ONE; | |
928 if( _test == gt ) return TypeInt::ZERO; | |
929 } | |
930 | |
931 return TypeInt::BOOL; | |
932 } | |
933 | |
934 //------------------------------dump_spec------------------------------------- | |
935 // Print special per-node info | |
936 #ifndef PRODUCT | |
937 void BoolTest::dump_on(outputStream *st) const { | |
938 const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"}; | |
939 st->print(msg[_test]); | |
940 } | |
941 #endif | |
942 | |
943 //============================================================================= | |
944 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); } | |
945 uint BoolNode::size_of() const { return sizeof(BoolNode); } | |
946 | |
947 //------------------------------operator==------------------------------------- | |
948 uint BoolNode::cmp( const Node &n ) const { | |
949 const BoolNode *b = (const BoolNode *)&n; // Cast up | |
950 return (_test._test == b->_test._test); | |
951 } | |
952 | |
953 //------------------------------clone_cmp-------------------------------------- | |
954 // Clone a compare/bool tree | |
955 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) { | |
956 Node *ncmp = cmp->clone(); | |
957 ncmp->set_req(1,cmp1); | |
958 ncmp->set_req(2,cmp2); | |
959 ncmp = gvn->transform( ncmp ); | |
960 return new (gvn->C, 2) BoolNode( ncmp, test ); | |
961 } | |
962 | |
963 //-------------------------------make_predicate-------------------------------- | |
964 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) { | |
965 if (test_value->is_Con()) return test_value; | |
966 if (test_value->is_Bool()) return test_value; | |
967 Compile* C = phase->C; | |
968 if (test_value->is_CMove() && | |
969 test_value->in(CMoveNode::Condition)->is_Bool()) { | |
970 BoolNode* bol = test_value->in(CMoveNode::Condition)->as_Bool(); | |
971 const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse)); | |
972 const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue)); | |
973 if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) { | |
974 return bol; | |
975 } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) { | |
976 return phase->transform( bol->negate(phase) ); | |
977 } | |
978 // Else fall through. The CMove gets in the way of the test. | |
979 // It should be the case that make_predicate(bol->as_int_value()) == bol. | |
980 } | |
981 Node* cmp = new (C, 3) CmpINode(test_value, phase->intcon(0)); | |
982 cmp = phase->transform(cmp); | |
983 Node* bol = new (C, 2) BoolNode(cmp, BoolTest::ne); | |
984 return phase->transform(bol); | |
985 } | |
986 | |
987 //--------------------------------as_int_value--------------------------------- | |
988 Node* BoolNode::as_int_value(PhaseGVN* phase) { | |
989 // Inverse to make_predicate. The CMove probably boils down to a Conv2B. | |
990 Node* cmov = CMoveNode::make(phase->C, NULL, this, | |
991 phase->intcon(0), phase->intcon(1), | |
992 TypeInt::BOOL); | |
993 return phase->transform(cmov); | |
994 } | |
995 | |
996 //----------------------------------negate------------------------------------- | |
997 BoolNode* BoolNode::negate(PhaseGVN* phase) { | |
998 Compile* C = phase->C; | |
999 return new (C, 2) BoolNode(in(1), _test.negate()); | |
1000 } | |
1001 | |
1002 | |
1003 //------------------------------Ideal------------------------------------------ | |
1004 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1005 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)". | |
1006 // This moves the constant to the right. Helps value-numbering. | |
1007 Node *cmp = in(1); | |
1008 if( !cmp->is_Sub() ) return NULL; | |
1009 int cop = cmp->Opcode(); | |
1010 if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL; | |
1011 Node *cmp1 = cmp->in(1); | |
1012 Node *cmp2 = cmp->in(2); | |
1013 if( !cmp1 ) return NULL; | |
1014 | |
1015 // Constant on left? | |
1016 Node *con = cmp1; | |
1017 uint op2 = cmp2->Opcode(); | |
1018 // Move constants to the right of compare's to canonicalize. | |
1019 // Do not muck with Opaque1 nodes, as this indicates a loop | |
1020 // guard that cannot change shape. | |
1021 if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 && | |
1022 // Because of NaN's, CmpD and CmpF are not commutative | |
1023 cop != Op_CmpD && cop != Op_CmpF && | |
1024 // Protect against swapping inputs to a compare when it is used by a | |
1025 // counted loop exit, which requires maintaining the loop-limit as in(2) | |
1026 !is_counted_loop_exit_test() ) { | |
1027 // Ok, commute the constant to the right of the cmp node. | |
1028 // Clone the Node, getting a new Node of the same class | |
1029 cmp = cmp->clone(); | |
1030 // Swap inputs to the clone | |
1031 cmp->swap_edges(1, 2); | |
1032 cmp = phase->transform( cmp ); | |
1033 return new (phase->C, 2) BoolNode( cmp, _test.commute() ); | |
1034 } | |
1035 | |
1036 // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)". | |
1037 // The XOR-1 is an idiom used to flip the sense of a bool. We flip the | |
1038 // test instead. | |
1039 int cmp1_op = cmp1->Opcode(); | |
1040 const TypeInt* cmp2_type = phase->type(cmp2)->isa_int(); | |
1041 if (cmp2_type == NULL) return NULL; | |
1042 Node* j_xor = cmp1; | |
1043 if( cmp2_type == TypeInt::ZERO && | |
1044 cmp1_op == Op_XorI && | |
1045 j_xor->in(1) != j_xor && // An xor of itself is dead | |
1046 phase->type( j_xor->in(2) ) == TypeInt::ONE && | |
1047 (_test._test == BoolTest::eq || | |
1048 _test._test == BoolTest::ne) ) { | |
1049 Node *ncmp = phase->transform(new (phase->C, 3) CmpINode(j_xor->in(1),cmp2)); | |
1050 return new (phase->C, 2) BoolNode( ncmp, _test.negate() ); | |
1051 } | |
1052 | |
1053 // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)". | |
1054 // This is a standard idiom for branching on a boolean value. | |
1055 Node *c2b = cmp1; | |
1056 if( cmp2_type == TypeInt::ZERO && | |
1057 cmp1_op == Op_Conv2B && | |
1058 (_test._test == BoolTest::eq || | |
1059 _test._test == BoolTest::ne) ) { | |
1060 Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int() | |
1061 ? (Node*)new (phase->C, 3) CmpINode(c2b->in(1),cmp2) | |
1062 : (Node*)new (phase->C, 3) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR)) | |
1063 ); | |
1064 return new (phase->C, 2) BoolNode( ncmp, _test._test ); | |
1065 } | |
1066 | |
1067 // Comparing a SubI against a zero is equal to comparing the SubI | |
1068 // arguments directly. This only works for eq and ne comparisons | |
1069 // due to possible integer overflow. | |
1070 if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) && | |
1071 (cop == Op_CmpI) && | |
1072 (cmp1->Opcode() == Op_SubI) && | |
1073 ( cmp2_type == TypeInt::ZERO ) ) { | |
1074 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(1),cmp1->in(2))); | |
1075 return new (phase->C, 2) BoolNode( ncmp, _test._test ); | |
1076 } | |
1077 | |
1078 // Change (-A vs 0) into (A vs 0) by commuting the test. Disallow in the | |
1079 // most general case because negating 0x80000000 does nothing. Needed for | |
1080 // the CmpF3/SubI/CmpI idiom. | |
1081 if( cop == Op_CmpI && | |
1082 cmp1->Opcode() == Op_SubI && | |
1083 cmp2_type == TypeInt::ZERO && | |
1084 phase->type( cmp1->in(1) ) == TypeInt::ZERO && | |
1085 phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) { | |
1086 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(2),cmp2)); | |
1087 return new (phase->C, 2) BoolNode( ncmp, _test.commute() ); | |
1088 } | |
1089 | |
1090 // The transformation below is not valid for either signed or unsigned | |
1091 // comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE. | |
1092 // This transformation can be resurrected when we are able to | |
1093 // make inferences about the range of values being subtracted from | |
1094 // (or added to) relative to the wraparound point. | |
1095 // | |
1096 // // Remove +/-1's if possible. | |
1097 // // "X <= Y-1" becomes "X < Y" | |
1098 // // "X+1 <= Y" becomes "X < Y" | |
1099 // // "X < Y+1" becomes "X <= Y" | |
1100 // // "X-1 < Y" becomes "X <= Y" | |
1101 // // Do not this to compares off of the counted-loop-end. These guys are | |
1102 // // checking the trip counter and they want to use the post-incremented | |
1103 // // counter. If they use the PRE-incremented counter, then the counter has | |
1104 // // to be incremented in a private block on a loop backedge. | |
1105 // if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd ) | |
1106 // return NULL; | |
1107 // #ifndef PRODUCT | |
1108 // // Do not do this in a wash GVN pass during verification. | |
1109 // // Gets triggered by too many simple optimizations to be bothered with | |
1110 // // re-trying it again and again. | |
1111 // if( !phase->allow_progress() ) return NULL; | |
1112 // #endif | |
1113 // // Not valid for unsigned compare because of corner cases in involving zero. | |
1114 // // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an | |
1115 // // exception in case X is 0 (because 0-1 turns into 4billion unsigned but | |
1116 // // "0 <=u Y" is always true). | |
1117 // if( cmp->Opcode() == Op_CmpU ) return NULL; | |
1118 // int cmp2_op = cmp2->Opcode(); | |
1119 // if( _test._test == BoolTest::le ) { | |
1120 // if( cmp1_op == Op_AddI && | |
1121 // phase->type( cmp1->in(2) ) == TypeInt::ONE ) | |
1122 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt ); | |
1123 // else if( cmp2_op == Op_AddI && | |
1124 // phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 ) | |
1125 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt ); | |
1126 // } else if( _test._test == BoolTest::lt ) { | |
1127 // if( cmp1_op == Op_AddI && | |
1128 // phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 ) | |
1129 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le ); | |
1130 // else if( cmp2_op == Op_AddI && | |
1131 // phase->type( cmp2->in(2) ) == TypeInt::ONE ) | |
1132 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le ); | |
1133 // } | |
1134 | |
1135 return NULL; | |
1136 } | |
1137 | |
1138 //------------------------------Value------------------------------------------ | |
1139 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node, | |
1140 // based on local information. If the input is constant, do it. | |
1141 const Type *BoolNode::Value( PhaseTransform *phase ) const { | |
1142 return _test.cc2logical( phase->type( in(1) ) ); | |
1143 } | |
1144 | |
1145 //------------------------------dump_spec-------------------------------------- | |
1146 // Dump special per-node info | |
1147 #ifndef PRODUCT | |
1148 void BoolNode::dump_spec(outputStream *st) const { | |
1149 st->print("["); | |
1150 _test.dump_on(st); | |
1151 st->print("]"); | |
1152 } | |
1153 #endif | |
1154 | |
1155 //------------------------------is_counted_loop_exit_test-------------------------------------- | |
1156 // Returns true if node is used by a counted loop node. | |
1157 bool BoolNode::is_counted_loop_exit_test() { | |
1158 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) { | |
1159 Node* use = fast_out(i); | |
1160 if (use->is_CountedLoopEnd()) { | |
1161 return true; | |
1162 } | |
1163 } | |
1164 return false; | |
1165 } | |
1166 | |
1167 //============================================================================= | |
1168 //------------------------------NegNode---------------------------------------- | |
1169 Node *NegFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1170 if( in(1)->Opcode() == Op_SubF ) | |
1171 return new (phase->C, 3) SubFNode( in(1)->in(2), in(1)->in(1) ); | |
1172 return NULL; | |
1173 } | |
1174 | |
1175 Node *NegDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
1176 if( in(1)->Opcode() == Op_SubD ) | |
1177 return new (phase->C, 3) SubDNode( in(1)->in(2), in(1)->in(1) ); | |
1178 return NULL; | |
1179 } | |
1180 | |
1181 | |
1182 //============================================================================= | |
1183 //------------------------------Value------------------------------------------ | |
1184 // Compute sqrt | |
1185 const Type *SqrtDNode::Value( PhaseTransform *phase ) const { | |
1186 const Type *t1 = phase->type( in(1) ); | |
1187 if( t1 == Type::TOP ) return Type::TOP; | |
1188 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1189 double d = t1->getd(); | |
1190 if( d < 0.0 ) return Type::DOUBLE; | |
1191 return TypeD::make( sqrt( d ) ); | |
1192 } | |
1193 | |
1194 //============================================================================= | |
1195 //------------------------------Value------------------------------------------ | |
1196 // Compute cos | |
1197 const Type *CosDNode::Value( PhaseTransform *phase ) const { | |
1198 const Type *t1 = phase->type( in(1) ); | |
1199 if( t1 == Type::TOP ) return Type::TOP; | |
1200 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1201 double d = t1->getd(); | |
1202 if( d < 0.0 ) return Type::DOUBLE; | |
1203 return TypeD::make( SharedRuntime::dcos( d ) ); | |
1204 } | |
1205 | |
1206 //============================================================================= | |
1207 //------------------------------Value------------------------------------------ | |
1208 // Compute sin | |
1209 const Type *SinDNode::Value( PhaseTransform *phase ) const { | |
1210 const Type *t1 = phase->type( in(1) ); | |
1211 if( t1 == Type::TOP ) return Type::TOP; | |
1212 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1213 double d = t1->getd(); | |
1214 if( d < 0.0 ) return Type::DOUBLE; | |
1215 return TypeD::make( SharedRuntime::dsin( d ) ); | |
1216 } | |
1217 | |
1218 //============================================================================= | |
1219 //------------------------------Value------------------------------------------ | |
1220 // Compute tan | |
1221 const Type *TanDNode::Value( PhaseTransform *phase ) const { | |
1222 const Type *t1 = phase->type( in(1) ); | |
1223 if( t1 == Type::TOP ) return Type::TOP; | |
1224 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1225 double d = t1->getd(); | |
1226 if( d < 0.0 ) return Type::DOUBLE; | |
1227 return TypeD::make( SharedRuntime::dtan( d ) ); | |
1228 } | |
1229 | |
1230 //============================================================================= | |
1231 //------------------------------Value------------------------------------------ | |
1232 // Compute log | |
1233 const Type *LogDNode::Value( PhaseTransform *phase ) const { | |
1234 const Type *t1 = phase->type( in(1) ); | |
1235 if( t1 == Type::TOP ) return Type::TOP; | |
1236 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1237 double d = t1->getd(); | |
1238 if( d < 0.0 ) return Type::DOUBLE; | |
1239 return TypeD::make( SharedRuntime::dlog( d ) ); | |
1240 } | |
1241 | |
1242 //============================================================================= | |
1243 //------------------------------Value------------------------------------------ | |
1244 // Compute log10 | |
1245 const Type *Log10DNode::Value( PhaseTransform *phase ) const { | |
1246 const Type *t1 = phase->type( in(1) ); | |
1247 if( t1 == Type::TOP ) return Type::TOP; | |
1248 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1249 double d = t1->getd(); | |
1250 if( d < 0.0 ) return Type::DOUBLE; | |
1251 return TypeD::make( SharedRuntime::dlog10( d ) ); | |
1252 } | |
1253 | |
1254 //============================================================================= | |
1255 //------------------------------Value------------------------------------------ | |
1256 // Compute exp | |
1257 const Type *ExpDNode::Value( PhaseTransform *phase ) const { | |
1258 const Type *t1 = phase->type( in(1) ); | |
1259 if( t1 == Type::TOP ) return Type::TOP; | |
1260 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1261 double d = t1->getd(); | |
1262 if( d < 0.0 ) return Type::DOUBLE; | |
1263 return TypeD::make( SharedRuntime::dexp( d ) ); | |
1264 } | |
1265 | |
1266 | |
1267 //============================================================================= | |
1268 //------------------------------Value------------------------------------------ | |
1269 // Compute pow | |
1270 const Type *PowDNode::Value( PhaseTransform *phase ) const { | |
1271 const Type *t1 = phase->type( in(1) ); | |
1272 if( t1 == Type::TOP ) return Type::TOP; | |
1273 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1274 const Type *t2 = phase->type( in(2) ); | |
1275 if( t2 == Type::TOP ) return Type::TOP; | |
1276 if( t2->base() != Type::DoubleCon ) return Type::DOUBLE; | |
1277 double d1 = t1->getd(); | |
1278 double d2 = t2->getd(); | |
1279 if( d1 < 0.0 ) return Type::DOUBLE; | |
1280 if( d2 < 0.0 ) return Type::DOUBLE; | |
1281 return TypeD::make( SharedRuntime::dpow( d1, d2 ) ); | |
1282 } |