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) {
|
|
617 ciKlass* klass0 = p0->klass();
|
|
618 bool xklass0 = p0->klass_is_exact();
|
|
619 ciKlass* klass1 = p1->klass();
|
|
620 bool xklass1 = p1->klass_is_exact();
|
|
621 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);
|
|
622 if (klass0 && klass1 &&
|
|
623 kps != 1 && // both or neither are klass pointers
|
|
624 !klass0->is_interface() && // do not trust interfaces
|
|
625 !klass1->is_interface()) {
|
|
626 // See if neither subclasses the other, or if the class on top
|
|
627 // is precise. In either of these cases, the compare must fail.
|
|
628 if (klass0->equals(klass1) || // if types are unequal but klasses are
|
|
629 !klass0->is_java_klass() || // types not part of Java language?
|
|
630 !klass1->is_java_klass()) { // types not part of Java language?
|
|
631 // Do nothing; we know nothing for imprecise types
|
|
632 } else if (klass0->is_subtype_of(klass1)) {
|
|
633 // If klass1's type is PRECISE, then we can fail.
|
|
634 if (xklass1) return TypeInt::CC_GT;
|
|
635 } else if (klass1->is_subtype_of(klass0)) {
|
|
636 // If klass0's type is PRECISE, then we can fail.
|
|
637 if (xklass0) return TypeInt::CC_GT;
|
|
638 } else { // Neither subtypes the other
|
|
639 return TypeInt::CC_GT; // ...so always fail
|
|
640 }
|
|
641 }
|
|
642 }
|
|
643
|
|
644 // Known constants can be compared exactly
|
|
645 // Null can be distinguished from any NotNull pointers
|
|
646 // Unknown inputs makes an unknown result
|
|
647 if( r0->singleton() ) {
|
|
648 intptr_t bits0 = r0->get_con();
|
|
649 if( r1->singleton() )
|
|
650 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
|
|
651 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
|
|
652 } else if( r1->singleton() ) {
|
|
653 intptr_t bits1 = r1->get_con();
|
|
654 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
|
|
655 } else
|
|
656 return TypeInt::CC;
|
|
657 }
|
|
658
|
|
659 //------------------------------Ideal------------------------------------------
|
|
660 // Check for the case of comparing an unknown klass loaded from the primary
|
|
661 // super-type array vs a known klass with no subtypes. This amounts to
|
|
662 // checking to see an unknown klass subtypes a known klass with no subtypes;
|
|
663 // this only happens on an exact match. We can shorten this test by 1 load.
|
|
664 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
|
|
665 // Constant pointer on right?
|
|
666 const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
|
|
667 if (t2 == NULL || !t2->klass_is_exact())
|
|
668 return NULL;
|
|
669 // Get the constant klass we are comparing to.
|
|
670 ciKlass* superklass = t2->klass();
|
|
671
|
|
672 // Now check for LoadKlass on left.
|
|
673 Node* ldk1 = in(1);
|
|
674 if (ldk1->Opcode() != Op_LoadKlass)
|
|
675 return NULL;
|
|
676 // Take apart the address of the LoadKlass:
|
|
677 Node* adr1 = ldk1->in(MemNode::Address);
|
|
678 intptr_t con2 = 0;
|
|
679 Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
|
|
680 if (ldk2 == NULL)
|
|
681 return NULL;
|
|
682 if (con2 == oopDesc::klass_offset_in_bytes()) {
|
|
683 // We are inspecting an object's concrete class.
|
|
684 // Short-circuit the check if the query is abstract.
|
|
685 if (superklass->is_interface() ||
|
|
686 superklass->is_abstract()) {
|
|
687 // Make it come out always false:
|
|
688 this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
|
|
689 return this;
|
|
690 }
|
|
691 }
|
|
692
|
|
693 // Check for a LoadKlass from primary supertype array.
|
|
694 // Any nested loadklass from loadklass+con must be from the p.s. array.
|
|
695 if (ldk2->Opcode() != Op_LoadKlass)
|
|
696 return NULL;
|
|
697
|
|
698 // Verify that we understand the situation
|
|
699 if (con2 != (intptr_t) superklass->super_check_offset())
|
|
700 return NULL; // Might be element-klass loading from array klass
|
|
701
|
|
702 // If 'superklass' has no subklasses and is not an interface, then we are
|
|
703 // assured that the only input which will pass the type check is
|
|
704 // 'superklass' itself.
|
|
705 //
|
|
706 // We could be more liberal here, and allow the optimization on interfaces
|
|
707 // which have a single implementor. This would require us to increase the
|
|
708 // expressiveness of the add_dependency() mechanism.
|
|
709 // %%% Do this after we fix TypeOopPtr: Deps are expressive enough now.
|
|
710
|
|
711 // Object arrays must have their base element have no subtypes
|
|
712 while (superklass->is_obj_array_klass()) {
|
|
713 ciType* elem = superklass->as_obj_array_klass()->element_type();
|
|
714 superklass = elem->as_klass();
|
|
715 }
|
|
716 if (superklass->is_instance_klass()) {
|
|
717 ciInstanceKlass* ik = superklass->as_instance_klass();
|
|
718 if (ik->has_subklass() || ik->is_interface()) return NULL;
|
|
719 // Add a dependency if there is a chance that a subclass will be added later.
|
|
720 if (!ik->is_final()) {
|
|
721 phase->C->dependencies()->assert_leaf_type(ik);
|
|
722 }
|
|
723 }
|
|
724
|
|
725 // Bypass the dependent load, and compare directly
|
|
726 this->set_req(1,ldk2);
|
|
727
|
|
728 return this;
|
|
729 }
|
|
730
|
|
731 //=============================================================================
|
|
732 //------------------------------Value------------------------------------------
|
|
733 // Simplify an CmpF (compare 2 floats ) node, based on local information.
|
|
734 // If both inputs are constants, compare them.
|
|
735 const Type *CmpFNode::Value( PhaseTransform *phase ) const {
|
|
736 const Node* in1 = in(1);
|
|
737 const Node* in2 = in(2);
|
|
738 // Either input is TOP ==> the result is TOP
|
|
739 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
|
|
740 if( t1 == Type::TOP ) return Type::TOP;
|
|
741 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
|
|
742 if( t2 == Type::TOP ) return Type::TOP;
|
|
743
|
|
744 // Not constants? Don't know squat - even if they are the same
|
|
745 // value! If they are NaN's they compare to LT instead of EQ.
|
|
746 const TypeF *tf1 = t1->isa_float_constant();
|
|
747 const TypeF *tf2 = t2->isa_float_constant();
|
|
748 if( !tf1 || !tf2 ) return TypeInt::CC;
|
|
749
|
|
750 // This implements the Java bytecode fcmpl, so unordered returns -1.
|
|
751 if( tf1->is_nan() || tf2->is_nan() )
|
|
752 return TypeInt::CC_LT;
|
|
753
|
|
754 if( tf1->_f < tf2->_f ) return TypeInt::CC_LT;
|
|
755 if( tf1->_f > tf2->_f ) return TypeInt::CC_GT;
|
|
756 assert( tf1->_f == tf2->_f, "do not understand FP behavior" );
|
|
757 return TypeInt::CC_EQ;
|
|
758 }
|
|
759
|
|
760
|
|
761 //=============================================================================
|
|
762 //------------------------------Value------------------------------------------
|
|
763 // Simplify an CmpD (compare 2 doubles ) node, based on local information.
|
|
764 // If both inputs are constants, compare them.
|
|
765 const Type *CmpDNode::Value( PhaseTransform *phase ) const {
|
|
766 const Node* in1 = in(1);
|
|
767 const Node* in2 = in(2);
|
|
768 // Either input is TOP ==> the result is TOP
|
|
769 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
|
|
770 if( t1 == Type::TOP ) return Type::TOP;
|
|
771 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
|
|
772 if( t2 == Type::TOP ) return Type::TOP;
|
|
773
|
|
774 // Not constants? Don't know squat - even if they are the same
|
|
775 // value! If they are NaN's they compare to LT instead of EQ.
|
|
776 const TypeD *td1 = t1->isa_double_constant();
|
|
777 const TypeD *td2 = t2->isa_double_constant();
|
|
778 if( !td1 || !td2 ) return TypeInt::CC;
|
|
779
|
|
780 // This implements the Java bytecode dcmpl, so unordered returns -1.
|
|
781 if( td1->is_nan() || td2->is_nan() )
|
|
782 return TypeInt::CC_LT;
|
|
783
|
|
784 if( td1->_d < td2->_d ) return TypeInt::CC_LT;
|
|
785 if( td1->_d > td2->_d ) return TypeInt::CC_GT;
|
|
786 assert( td1->_d == td2->_d, "do not understand FP behavior" );
|
|
787 return TypeInt::CC_EQ;
|
|
788 }
|
|
789
|
|
790 //------------------------------Ideal------------------------------------------
|
|
791 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){
|
|
792 // Check if we can change this to a CmpF and remove a ConvD2F operation.
|
|
793 // Change (CMPD (F2D (float)) (ConD value))
|
|
794 // To (CMPF (float) (ConF value))
|
|
795 // Valid when 'value' does not lose precision as a float.
|
|
796 // Benefits: eliminates conversion, does not require 24-bit mode
|
|
797
|
|
798 // NaNs prevent commuting operands. This transform works regardless of the
|
|
799 // order of ConD and ConvF2D inputs by preserving the original order.
|
|
800 int idx_f2d = 1; // ConvF2D on left side?
|
|
801 if( in(idx_f2d)->Opcode() != Op_ConvF2D )
|
|
802 idx_f2d = 2; // No, swap to check for reversed args
|
|
803 int idx_con = 3-idx_f2d; // Check for the constant on other input
|
|
804
|
|
805 if( ConvertCmpD2CmpF &&
|
|
806 in(idx_f2d)->Opcode() == Op_ConvF2D &&
|
|
807 in(idx_con)->Opcode() == Op_ConD ) {
|
|
808 const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant();
|
|
809 double t2_value_as_double = t2->_d;
|
|
810 float t2_value_as_float = (float)t2_value_as_double;
|
|
811 if( t2_value_as_double == (double)t2_value_as_float ) {
|
|
812 // Test value can be represented as a float
|
|
813 // Eliminate the conversion to double and create new comparison
|
|
814 Node *new_in1 = in(idx_f2d)->in(1);
|
|
815 Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) );
|
|
816 if( idx_f2d != 1 ) { // Must flip args to match original order
|
|
817 Node *tmp = new_in1;
|
|
818 new_in1 = new_in2;
|
|
819 new_in2 = tmp;
|
|
820 }
|
|
821 CmpFNode *new_cmp = (Opcode() == Op_CmpD3)
|
|
822 ? new (phase->C, 3) CmpF3Node( new_in1, new_in2 )
|
|
823 : new (phase->C, 3) CmpFNode ( new_in1, new_in2 ) ;
|
|
824 return new_cmp; // Changed to CmpFNode
|
|
825 }
|
|
826 // Testing value required the precision of a double
|
|
827 }
|
|
828 return NULL; // No change
|
|
829 }
|
|
830
|
|
831
|
|
832 //=============================================================================
|
|
833 //------------------------------cc2logical-------------------------------------
|
|
834 // Convert a condition code type to a logical type
|
|
835 const Type *BoolTest::cc2logical( const Type *CC ) const {
|
|
836 if( CC == Type::TOP ) return Type::TOP;
|
|
837 if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse
|
|
838 const TypeInt *ti = CC->is_int();
|
|
839 if( ti->is_con() ) { // Only 1 kind of condition codes set?
|
|
840 // Match low order 2 bits
|
|
841 int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0;
|
|
842 if( _test & 4 ) tmp = 1-tmp; // Optionally complement result
|
|
843 return TypeInt::make(tmp); // Boolean result
|
|
844 }
|
|
845
|
|
846 if( CC == TypeInt::CC_GE ) {
|
|
847 if( _test == ge ) return TypeInt::ONE;
|
|
848 if( _test == lt ) return TypeInt::ZERO;
|
|
849 }
|
|
850 if( CC == TypeInt::CC_LE ) {
|
|
851 if( _test == le ) return TypeInt::ONE;
|
|
852 if( _test == gt ) return TypeInt::ZERO;
|
|
853 }
|
|
854
|
|
855 return TypeInt::BOOL;
|
|
856 }
|
|
857
|
|
858 //------------------------------dump_spec-------------------------------------
|
|
859 // Print special per-node info
|
|
860 #ifndef PRODUCT
|
|
861 void BoolTest::dump_on(outputStream *st) const {
|
|
862 const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"};
|
|
863 st->print(msg[_test]);
|
|
864 }
|
|
865 #endif
|
|
866
|
|
867 //=============================================================================
|
|
868 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); }
|
|
869 uint BoolNode::size_of() const { return sizeof(BoolNode); }
|
|
870
|
|
871 //------------------------------operator==-------------------------------------
|
|
872 uint BoolNode::cmp( const Node &n ) const {
|
|
873 const BoolNode *b = (const BoolNode *)&n; // Cast up
|
|
874 return (_test._test == b->_test._test);
|
|
875 }
|
|
876
|
|
877 //------------------------------clone_cmp--------------------------------------
|
|
878 // Clone a compare/bool tree
|
|
879 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) {
|
|
880 Node *ncmp = cmp->clone();
|
|
881 ncmp->set_req(1,cmp1);
|
|
882 ncmp->set_req(2,cmp2);
|
|
883 ncmp = gvn->transform( ncmp );
|
|
884 return new (gvn->C, 2) BoolNode( ncmp, test );
|
|
885 }
|
|
886
|
|
887 //-------------------------------make_predicate--------------------------------
|
|
888 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) {
|
|
889 if (test_value->is_Con()) return test_value;
|
|
890 if (test_value->is_Bool()) return test_value;
|
|
891 Compile* C = phase->C;
|
|
892 if (test_value->is_CMove() &&
|
|
893 test_value->in(CMoveNode::Condition)->is_Bool()) {
|
|
894 BoolNode* bol = test_value->in(CMoveNode::Condition)->as_Bool();
|
|
895 const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse));
|
|
896 const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue));
|
|
897 if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) {
|
|
898 return bol;
|
|
899 } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) {
|
|
900 return phase->transform( bol->negate(phase) );
|
|
901 }
|
|
902 // Else fall through. The CMove gets in the way of the test.
|
|
903 // It should be the case that make_predicate(bol->as_int_value()) == bol.
|
|
904 }
|
|
905 Node* cmp = new (C, 3) CmpINode(test_value, phase->intcon(0));
|
|
906 cmp = phase->transform(cmp);
|
|
907 Node* bol = new (C, 2) BoolNode(cmp, BoolTest::ne);
|
|
908 return phase->transform(bol);
|
|
909 }
|
|
910
|
|
911 //--------------------------------as_int_value---------------------------------
|
|
912 Node* BoolNode::as_int_value(PhaseGVN* phase) {
|
|
913 // Inverse to make_predicate. The CMove probably boils down to a Conv2B.
|
|
914 Node* cmov = CMoveNode::make(phase->C, NULL, this,
|
|
915 phase->intcon(0), phase->intcon(1),
|
|
916 TypeInt::BOOL);
|
|
917 return phase->transform(cmov);
|
|
918 }
|
|
919
|
|
920 //----------------------------------negate-------------------------------------
|
|
921 BoolNode* BoolNode::negate(PhaseGVN* phase) {
|
|
922 Compile* C = phase->C;
|
|
923 return new (C, 2) BoolNode(in(1), _test.negate());
|
|
924 }
|
|
925
|
|
926
|
|
927 //------------------------------Ideal------------------------------------------
|
|
928 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) {
|
|
929 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)".
|
|
930 // This moves the constant to the right. Helps value-numbering.
|
|
931 Node *cmp = in(1);
|
|
932 if( !cmp->is_Sub() ) return NULL;
|
|
933 int cop = cmp->Opcode();
|
|
934 if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL;
|
|
935 Node *cmp1 = cmp->in(1);
|
|
936 Node *cmp2 = cmp->in(2);
|
|
937 if( !cmp1 ) return NULL;
|
|
938
|
|
939 // Constant on left?
|
|
940 Node *con = cmp1;
|
|
941 uint op2 = cmp2->Opcode();
|
|
942 // Move constants to the right of compare's to canonicalize.
|
|
943 // Do not muck with Opaque1 nodes, as this indicates a loop
|
|
944 // guard that cannot change shape.
|
|
945 if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 &&
|
|
946 // Because of NaN's, CmpD and CmpF are not commutative
|
|
947 cop != Op_CmpD && cop != Op_CmpF &&
|
|
948 // Protect against swapping inputs to a compare when it is used by a
|
|
949 // counted loop exit, which requires maintaining the loop-limit as in(2)
|
|
950 !is_counted_loop_exit_test() ) {
|
|
951 // Ok, commute the constant to the right of the cmp node.
|
|
952 // Clone the Node, getting a new Node of the same class
|
|
953 cmp = cmp->clone();
|
|
954 // Swap inputs to the clone
|
|
955 cmp->swap_edges(1, 2);
|
|
956 cmp = phase->transform( cmp );
|
|
957 return new (phase->C, 2) BoolNode( cmp, _test.commute() );
|
|
958 }
|
|
959
|
|
960 // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)".
|
|
961 // The XOR-1 is an idiom used to flip the sense of a bool. We flip the
|
|
962 // test instead.
|
|
963 int cmp1_op = cmp1->Opcode();
|
|
964 const TypeInt* cmp2_type = phase->type(cmp2)->isa_int();
|
|
965 if (cmp2_type == NULL) return NULL;
|
|
966 Node* j_xor = cmp1;
|
|
967 if( cmp2_type == TypeInt::ZERO &&
|
|
968 cmp1_op == Op_XorI &&
|
|
969 j_xor->in(1) != j_xor && // An xor of itself is dead
|
|
970 phase->type( j_xor->in(2) ) == TypeInt::ONE &&
|
|
971 (_test._test == BoolTest::eq ||
|
|
972 _test._test == BoolTest::ne) ) {
|
|
973 Node *ncmp = phase->transform(new (phase->C, 3) CmpINode(j_xor->in(1),cmp2));
|
|
974 return new (phase->C, 2) BoolNode( ncmp, _test.negate() );
|
|
975 }
|
|
976
|
|
977 // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)".
|
|
978 // This is a standard idiom for branching on a boolean value.
|
|
979 Node *c2b = cmp1;
|
|
980 if( cmp2_type == TypeInt::ZERO &&
|
|
981 cmp1_op == Op_Conv2B &&
|
|
982 (_test._test == BoolTest::eq ||
|
|
983 _test._test == BoolTest::ne) ) {
|
|
984 Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int()
|
|
985 ? (Node*)new (phase->C, 3) CmpINode(c2b->in(1),cmp2)
|
|
986 : (Node*)new (phase->C, 3) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR))
|
|
987 );
|
|
988 return new (phase->C, 2) BoolNode( ncmp, _test._test );
|
|
989 }
|
|
990
|
|
991 // Comparing a SubI against a zero is equal to comparing the SubI
|
|
992 // arguments directly. This only works for eq and ne comparisons
|
|
993 // due to possible integer overflow.
|
|
994 if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) &&
|
|
995 (cop == Op_CmpI) &&
|
|
996 (cmp1->Opcode() == Op_SubI) &&
|
|
997 ( cmp2_type == TypeInt::ZERO ) ) {
|
|
998 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(1),cmp1->in(2)));
|
|
999 return new (phase->C, 2) BoolNode( ncmp, _test._test );
|
|
1000 }
|
|
1001
|
|
1002 // Change (-A vs 0) into (A vs 0) by commuting the test. Disallow in the
|
|
1003 // most general case because negating 0x80000000 does nothing. Needed for
|
|
1004 // the CmpF3/SubI/CmpI idiom.
|
|
1005 if( cop == Op_CmpI &&
|
|
1006 cmp1->Opcode() == Op_SubI &&
|
|
1007 cmp2_type == TypeInt::ZERO &&
|
|
1008 phase->type( cmp1->in(1) ) == TypeInt::ZERO &&
|
|
1009 phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) {
|
|
1010 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(2),cmp2));
|
|
1011 return new (phase->C, 2) BoolNode( ncmp, _test.commute() );
|
|
1012 }
|
|
1013
|
|
1014 // The transformation below is not valid for either signed or unsigned
|
|
1015 // comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE.
|
|
1016 // This transformation can be resurrected when we are able to
|
|
1017 // make inferences about the range of values being subtracted from
|
|
1018 // (or added to) relative to the wraparound point.
|
|
1019 //
|
|
1020 // // Remove +/-1's if possible.
|
|
1021 // // "X <= Y-1" becomes "X < Y"
|
|
1022 // // "X+1 <= Y" becomes "X < Y"
|
|
1023 // // "X < Y+1" becomes "X <= Y"
|
|
1024 // // "X-1 < Y" becomes "X <= Y"
|
|
1025 // // Do not this to compares off of the counted-loop-end. These guys are
|
|
1026 // // checking the trip counter and they want to use the post-incremented
|
|
1027 // // counter. If they use the PRE-incremented counter, then the counter has
|
|
1028 // // to be incremented in a private block on a loop backedge.
|
|
1029 // if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd )
|
|
1030 // return NULL;
|
|
1031 // #ifndef PRODUCT
|
|
1032 // // Do not do this in a wash GVN pass during verification.
|
|
1033 // // Gets triggered by too many simple optimizations to be bothered with
|
|
1034 // // re-trying it again and again.
|
|
1035 // if( !phase->allow_progress() ) return NULL;
|
|
1036 // #endif
|
|
1037 // // Not valid for unsigned compare because of corner cases in involving zero.
|
|
1038 // // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an
|
|
1039 // // exception in case X is 0 (because 0-1 turns into 4billion unsigned but
|
|
1040 // // "0 <=u Y" is always true).
|
|
1041 // if( cmp->Opcode() == Op_CmpU ) return NULL;
|
|
1042 // int cmp2_op = cmp2->Opcode();
|
|
1043 // if( _test._test == BoolTest::le ) {
|
|
1044 // if( cmp1_op == Op_AddI &&
|
|
1045 // phase->type( cmp1->in(2) ) == TypeInt::ONE )
|
|
1046 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt );
|
|
1047 // else if( cmp2_op == Op_AddI &&
|
|
1048 // phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 )
|
|
1049 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt );
|
|
1050 // } else if( _test._test == BoolTest::lt ) {
|
|
1051 // if( cmp1_op == Op_AddI &&
|
|
1052 // phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 )
|
|
1053 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le );
|
|
1054 // else if( cmp2_op == Op_AddI &&
|
|
1055 // phase->type( cmp2->in(2) ) == TypeInt::ONE )
|
|
1056 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le );
|
|
1057 // }
|
|
1058
|
|
1059 return NULL;
|
|
1060 }
|
|
1061
|
|
1062 //------------------------------Value------------------------------------------
|
|
1063 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node,
|
|
1064 // based on local information. If the input is constant, do it.
|
|
1065 const Type *BoolNode::Value( PhaseTransform *phase ) const {
|
|
1066 return _test.cc2logical( phase->type( in(1) ) );
|
|
1067 }
|
|
1068
|
|
1069 //------------------------------dump_spec--------------------------------------
|
|
1070 // Dump special per-node info
|
|
1071 #ifndef PRODUCT
|
|
1072 void BoolNode::dump_spec(outputStream *st) const {
|
|
1073 st->print("[");
|
|
1074 _test.dump_on(st);
|
|
1075 st->print("]");
|
|
1076 }
|
|
1077 #endif
|
|
1078
|
|
1079 //------------------------------is_counted_loop_exit_test--------------------------------------
|
|
1080 // Returns true if node is used by a counted loop node.
|
|
1081 bool BoolNode::is_counted_loop_exit_test() {
|
|
1082 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) {
|
|
1083 Node* use = fast_out(i);
|
|
1084 if (use->is_CountedLoopEnd()) {
|
|
1085 return true;
|
|
1086 }
|
|
1087 }
|
|
1088 return false;
|
|
1089 }
|
|
1090
|
|
1091 //=============================================================================
|
|
1092 //------------------------------NegNode----------------------------------------
|
|
1093 Node *NegFNode::Ideal(PhaseGVN *phase, bool can_reshape) {
|
|
1094 if( in(1)->Opcode() == Op_SubF )
|
|
1095 return new (phase->C, 3) SubFNode( in(1)->in(2), in(1)->in(1) );
|
|
1096 return NULL;
|
|
1097 }
|
|
1098
|
|
1099 Node *NegDNode::Ideal(PhaseGVN *phase, bool can_reshape) {
|
|
1100 if( in(1)->Opcode() == Op_SubD )
|
|
1101 return new (phase->C, 3) SubDNode( in(1)->in(2), in(1)->in(1) );
|
|
1102 return NULL;
|
|
1103 }
|
|
1104
|
|
1105
|
|
1106 //=============================================================================
|
|
1107 //------------------------------Value------------------------------------------
|
|
1108 // Compute sqrt
|
|
1109 const Type *SqrtDNode::Value( PhaseTransform *phase ) const {
|
|
1110 const Type *t1 = phase->type( in(1) );
|
|
1111 if( t1 == Type::TOP ) return Type::TOP;
|
|
1112 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1113 double d = t1->getd();
|
|
1114 if( d < 0.0 ) return Type::DOUBLE;
|
|
1115 return TypeD::make( sqrt( d ) );
|
|
1116 }
|
|
1117
|
|
1118 //=============================================================================
|
|
1119 //------------------------------Value------------------------------------------
|
|
1120 // Compute cos
|
|
1121 const Type *CosDNode::Value( PhaseTransform *phase ) const {
|
|
1122 const Type *t1 = phase->type( in(1) );
|
|
1123 if( t1 == Type::TOP ) return Type::TOP;
|
|
1124 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1125 double d = t1->getd();
|
|
1126 if( d < 0.0 ) return Type::DOUBLE;
|
|
1127 return TypeD::make( SharedRuntime::dcos( d ) );
|
|
1128 }
|
|
1129
|
|
1130 //=============================================================================
|
|
1131 //------------------------------Value------------------------------------------
|
|
1132 // Compute sin
|
|
1133 const Type *SinDNode::Value( PhaseTransform *phase ) const {
|
|
1134 const Type *t1 = phase->type( in(1) );
|
|
1135 if( t1 == Type::TOP ) return Type::TOP;
|
|
1136 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1137 double d = t1->getd();
|
|
1138 if( d < 0.0 ) return Type::DOUBLE;
|
|
1139 return TypeD::make( SharedRuntime::dsin( d ) );
|
|
1140 }
|
|
1141
|
|
1142 //=============================================================================
|
|
1143 //------------------------------Value------------------------------------------
|
|
1144 // Compute tan
|
|
1145 const Type *TanDNode::Value( PhaseTransform *phase ) const {
|
|
1146 const Type *t1 = phase->type( in(1) );
|
|
1147 if( t1 == Type::TOP ) return Type::TOP;
|
|
1148 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1149 double d = t1->getd();
|
|
1150 if( d < 0.0 ) return Type::DOUBLE;
|
|
1151 return TypeD::make( SharedRuntime::dtan( d ) );
|
|
1152 }
|
|
1153
|
|
1154 //=============================================================================
|
|
1155 //------------------------------Value------------------------------------------
|
|
1156 // Compute log
|
|
1157 const Type *LogDNode::Value( PhaseTransform *phase ) const {
|
|
1158 const Type *t1 = phase->type( in(1) );
|
|
1159 if( t1 == Type::TOP ) return Type::TOP;
|
|
1160 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1161 double d = t1->getd();
|
|
1162 if( d < 0.0 ) return Type::DOUBLE;
|
|
1163 return TypeD::make( SharedRuntime::dlog( d ) );
|
|
1164 }
|
|
1165
|
|
1166 //=============================================================================
|
|
1167 //------------------------------Value------------------------------------------
|
|
1168 // Compute log10
|
|
1169 const Type *Log10DNode::Value( PhaseTransform *phase ) const {
|
|
1170 const Type *t1 = phase->type( in(1) );
|
|
1171 if( t1 == Type::TOP ) return Type::TOP;
|
|
1172 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1173 double d = t1->getd();
|
|
1174 if( d < 0.0 ) return Type::DOUBLE;
|
|
1175 return TypeD::make( SharedRuntime::dlog10( d ) );
|
|
1176 }
|
|
1177
|
|
1178 //=============================================================================
|
|
1179 //------------------------------Value------------------------------------------
|
|
1180 // Compute exp
|
|
1181 const Type *ExpDNode::Value( PhaseTransform *phase ) const {
|
|
1182 const Type *t1 = phase->type( in(1) );
|
|
1183 if( t1 == Type::TOP ) return Type::TOP;
|
|
1184 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1185 double d = t1->getd();
|
|
1186 if( d < 0.0 ) return Type::DOUBLE;
|
|
1187 return TypeD::make( SharedRuntime::dexp( d ) );
|
|
1188 }
|
|
1189
|
|
1190
|
|
1191 //=============================================================================
|
|
1192 //------------------------------Value------------------------------------------
|
|
1193 // Compute pow
|
|
1194 const Type *PowDNode::Value( PhaseTransform *phase ) const {
|
|
1195 const Type *t1 = phase->type( in(1) );
|
|
1196 if( t1 == Type::TOP ) return Type::TOP;
|
|
1197 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1198 const Type *t2 = phase->type( in(2) );
|
|
1199 if( t2 == Type::TOP ) return Type::TOP;
|
|
1200 if( t2->base() != Type::DoubleCon ) return Type::DOUBLE;
|
|
1201 double d1 = t1->getd();
|
|
1202 double d2 = t2->getd();
|
|
1203 if( d1 < 0.0 ) return Type::DOUBLE;
|
|
1204 if( d2 < 0.0 ) return Type::DOUBLE;
|
|
1205 return TypeD::make( SharedRuntime::dpow( d1, d2 ) );
|
|
1206 }
|