Mercurial > hg > truffle
annotate src/share/vm/c1/c1_Canonicalizer.cpp @ 1764:14197af1010e
Merge
author | never |
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date | Fri, 27 Aug 2010 17:35:08 -0700 |
parents | b812ff5abc73 |
children | d5d065957597 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
c18cbe5936b8
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_c1_Canonicalizer.cpp.incl" | |
27 | |
28 | |
1584 | 29 class PrintValueVisitor: public ValueVisitor { |
30 void visit(Value* vp) { | |
31 (*vp)->print_line(); | |
32 } | |
33 }; | |
0 | 34 |
35 void Canonicalizer::set_canonical(Value x) { | |
36 assert(x != NULL, "value must exist"); | |
37 // Note: we can not currently substitute root nodes which show up in | |
38 // the instruction stream (because the instruction list is embedded | |
39 // in the instructions). | |
40 if (canonical() != x) { | |
41 if (PrintCanonicalization) { | |
1584 | 42 PrintValueVisitor do_print_value; |
43 canonical()->input_values_do(&do_print_value); | |
0 | 44 canonical()->print_line(); |
45 tty->print_cr("canonicalized to:"); | |
1584 | 46 x->input_values_do(&do_print_value); |
0 | 47 x->print_line(); |
48 tty->cr(); | |
49 } | |
50 assert(_canonical->type()->tag() == x->type()->tag(), "types must match"); | |
51 _canonical = x; | |
52 } | |
53 } | |
54 | |
55 | |
56 void Canonicalizer::move_const_to_right(Op2* x) { | |
57 if (x->x()->type()->is_constant() && x->is_commutative()) x->swap_operands(); | |
58 } | |
59 | |
60 | |
61 void Canonicalizer::do_Op2(Op2* x) { | |
62 if (x->x() == x->y()) { | |
63 switch (x->op()) { | |
64 case Bytecodes::_isub: set_constant(0); return; | |
65 case Bytecodes::_lsub: set_constant(jlong_cast(0)); return; | |
66 case Bytecodes::_iand: // fall through | |
67 case Bytecodes::_land: // fall through | |
68 case Bytecodes::_ior: // fall through | |
69 case Bytecodes::_lor : set_canonical(x->x()); return; | |
70 case Bytecodes::_ixor: set_constant(0); return; | |
71 case Bytecodes::_lxor: set_constant(jlong_cast(0)); return; | |
72 } | |
73 } | |
74 | |
75 if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
76 // do constant folding for selected operations | |
77 switch (x->type()->tag()) { | |
78 case intTag: | |
79 { jint a = x->x()->type()->as_IntConstant()->value(); | |
80 jint b = x->y()->type()->as_IntConstant()->value(); | |
81 switch (x->op()) { | |
82 case Bytecodes::_iadd: set_constant(a + b); return; | |
83 case Bytecodes::_isub: set_constant(a - b); return; | |
84 case Bytecodes::_imul: set_constant(a * b); return; | |
85 case Bytecodes::_idiv: | |
86 if (b != 0) { | |
87 if (a == min_jint && b == -1) { | |
88 set_constant(min_jint); | |
89 } else { | |
90 set_constant(a / b); | |
91 } | |
92 return; | |
93 } | |
94 break; | |
95 case Bytecodes::_irem: | |
96 if (b != 0) { | |
97 if (a == min_jint && b == -1) { | |
98 set_constant(0); | |
99 } else { | |
100 set_constant(a % b); | |
101 } | |
102 return; | |
103 } | |
104 break; | |
105 case Bytecodes::_iand: set_constant(a & b); return; | |
106 case Bytecodes::_ior : set_constant(a | b); return; | |
107 case Bytecodes::_ixor: set_constant(a ^ b); return; | |
108 } | |
109 } | |
110 break; | |
111 case longTag: | |
112 { jlong a = x->x()->type()->as_LongConstant()->value(); | |
113 jlong b = x->y()->type()->as_LongConstant()->value(); | |
114 switch (x->op()) { | |
115 case Bytecodes::_ladd: set_constant(a + b); return; | |
116 case Bytecodes::_lsub: set_constant(a - b); return; | |
117 case Bytecodes::_lmul: set_constant(a * b); return; | |
118 case Bytecodes::_ldiv: | |
119 if (b != 0) { | |
120 set_constant(SharedRuntime::ldiv(b, a)); | |
121 return; | |
122 } | |
123 break; | |
124 case Bytecodes::_lrem: | |
125 if (b != 0) { | |
126 set_constant(SharedRuntime::lrem(b, a)); | |
127 return; | |
128 } | |
129 break; | |
130 case Bytecodes::_land: set_constant(a & b); return; | |
131 case Bytecodes::_lor : set_constant(a | b); return; | |
132 case Bytecodes::_lxor: set_constant(a ^ b); return; | |
133 } | |
134 } | |
135 break; | |
136 // other cases not implemented (must be extremely careful with floats & doubles!) | |
137 } | |
138 } | |
139 // make sure constant is on the right side, if any | |
140 move_const_to_right(x); | |
141 | |
142 if (x->y()->type()->is_constant()) { | |
143 // do constant folding for selected operations | |
144 switch (x->type()->tag()) { | |
145 case intTag: | |
146 if (x->y()->type()->as_IntConstant()->value() == 0) { | |
147 switch (x->op()) { | |
148 case Bytecodes::_iadd: set_canonical(x->x()); return; | |
149 case Bytecodes::_isub: set_canonical(x->x()); return; | |
150 case Bytecodes::_imul: set_constant(0); return; | |
151 // Note: for div and rem, make sure that C semantics | |
152 // corresponds to Java semantics! | |
153 case Bytecodes::_iand: set_constant(0); return; | |
154 case Bytecodes::_ior : set_canonical(x->x()); return; | |
155 } | |
156 } | |
157 break; | |
158 case longTag: | |
159 if (x->y()->type()->as_LongConstant()->value() == (jlong)0) { | |
160 switch (x->op()) { | |
161 case Bytecodes::_ladd: set_canonical(x->x()); return; | |
162 case Bytecodes::_lsub: set_canonical(x->x()); return; | |
163 case Bytecodes::_lmul: set_constant((jlong)0); return; | |
164 // Note: for div and rem, make sure that C semantics | |
165 // corresponds to Java semantics! | |
166 case Bytecodes::_land: set_constant((jlong)0); return; | |
167 case Bytecodes::_lor : set_canonical(x->x()); return; | |
168 } | |
169 } | |
170 break; | |
171 } | |
172 } | |
173 } | |
174 | |
175 | |
176 void Canonicalizer::do_Phi (Phi* x) {} | |
177 void Canonicalizer::do_Constant (Constant* x) {} | |
178 void Canonicalizer::do_Local (Local* x) {} | |
179 void Canonicalizer::do_LoadField (LoadField* x) {} | |
180 | |
181 // checks if v is in the block that is currently processed by | |
182 // GraphBuilder. This is the only block that has not BlockEnd yet. | |
183 static bool in_current_block(Value v) { | |
184 int max_distance = 4; | |
185 while (max_distance > 0 && v != NULL && v->as_BlockEnd() == NULL) { | |
186 v = v->next(); | |
187 max_distance--; | |
188 } | |
189 return v == NULL; | |
190 } | |
191 | |
192 void Canonicalizer::do_StoreField (StoreField* x) { | |
193 // If a value is going to be stored into a field or array some of | |
194 // the conversions emitted by javac are unneeded because the fields | |
195 // are packed to their natural size. | |
196 Convert* conv = x->value()->as_Convert(); | |
197 if (conv) { | |
198 Value value = NULL; | |
199 BasicType type = x->field()->type()->basic_type(); | |
200 switch (conv->op()) { | |
201 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
202 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
203 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
204 } | |
205 // limit this optimization to current block | |
206 if (value != NULL && in_current_block(conv)) { | |
207 set_canonical(new StoreField(x->obj(), x->offset(), x->field(), value, x->is_static(), | |
1584 | 208 x->lock_stack(), x->state_before(), x->is_loaded(), x->is_initialized())); |
0 | 209 return; |
210 } | |
211 } | |
212 | |
213 } | |
214 | |
215 void Canonicalizer::do_ArrayLength (ArrayLength* x) { | |
216 NewArray* array = x->array()->as_NewArray(); | |
217 if (array != NULL && array->length() != NULL) { | |
218 Constant* length = array->length()->as_Constant(); | |
219 if (length != NULL) { | |
220 // do not use the Constant itself, but create a new Constant | |
221 // with same value Otherwise a Constant is live over multiple | |
222 // blocks without being registered in a state array. | |
223 assert(length->type()->as_IntConstant() != NULL, "array length must be integer"); | |
224 set_constant(length->type()->as_IntConstant()->value()); | |
225 } | |
226 } else { | |
227 LoadField* lf = x->array()->as_LoadField(); | |
1295 | 228 if (lf != NULL) { |
229 ciField* field = lf->field(); | |
230 if (field->is_constant() && field->is_static()) { | |
231 // final static field | |
232 ciObject* c = field->constant_value().as_object(); | |
233 if (c->is_array()) { | |
234 ciArray* array = (ciArray*) c; | |
235 set_constant(array->length()); | |
236 } | |
0 | 237 } |
238 } | |
239 } | |
240 } | |
241 | |
242 void Canonicalizer::do_LoadIndexed (LoadIndexed* x) {} | |
243 void Canonicalizer::do_StoreIndexed (StoreIndexed* x) { | |
244 // If a value is going to be stored into a field or array some of | |
245 // the conversions emitted by javac are unneeded because the fields | |
246 // are packed to their natural size. | |
247 Convert* conv = x->value()->as_Convert(); | |
248 if (conv) { | |
249 Value value = NULL; | |
250 BasicType type = x->elt_type(); | |
251 switch (conv->op()) { | |
252 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
253 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
254 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
255 } | |
256 // limit this optimization to current block | |
257 if (value != NULL && in_current_block(conv)) { | |
258 set_canonical(new StoreIndexed(x->array(), x->index(), x->length(), | |
259 x->elt_type(), value, x->lock_stack())); | |
260 return; | |
261 } | |
262 } | |
263 | |
264 | |
265 } | |
266 | |
267 | |
268 void Canonicalizer::do_NegateOp(NegateOp* x) { | |
269 ValueType* t = x->x()->type(); | |
270 if (t->is_constant()) { | |
271 switch (t->tag()) { | |
272 case intTag : set_constant(-t->as_IntConstant ()->value()); return; | |
273 case longTag : set_constant(-t->as_LongConstant ()->value()); return; | |
274 case floatTag : set_constant(-t->as_FloatConstant ()->value()); return; | |
275 case doubleTag: set_constant(-t->as_DoubleConstant()->value()); return; | |
276 default : ShouldNotReachHere(); | |
277 } | |
278 } | |
279 } | |
280 | |
281 | |
282 void Canonicalizer::do_ArithmeticOp (ArithmeticOp* x) { do_Op2(x); } | |
283 | |
284 | |
285 void Canonicalizer::do_ShiftOp (ShiftOp* x) { | |
286 ValueType* t = x->x()->type(); | |
287 ValueType* t2 = x->y()->type(); | |
288 if (t->is_constant()) { | |
289 switch (t->tag()) { | |
290 case intTag : if (t->as_IntConstant()->value() == 0) { set_constant(0); return; } break; | |
291 case longTag : if (t->as_LongConstant()->value() == (jlong)0) { set_constant(jlong_cast(0)); return; } break; | |
292 default : ShouldNotReachHere(); | |
293 } | |
294 if (t2->is_constant()) { | |
295 if (t->tag() == intTag) { | |
296 int value = t->as_IntConstant()->value(); | |
297 int shift = t2->as_IntConstant()->value() & 31; | |
298 jint mask = ~(~0 << (32 - shift)); | |
299 if (shift == 0) mask = ~0; | |
300 switch (x->op()) { | |
301 case Bytecodes::_ishl: set_constant(value << shift); return; | |
302 case Bytecodes::_ishr: set_constant(value >> shift); return; | |
303 case Bytecodes::_iushr: set_constant((value >> shift) & mask); return; | |
304 } | |
305 } else if (t->tag() == longTag) { | |
306 jlong value = t->as_LongConstant()->value(); | |
307 int shift = t2->as_IntConstant()->value() & 63; | |
308 jlong mask = ~(~jlong_cast(0) << (64 - shift)); | |
309 if (shift == 0) mask = ~jlong_cast(0); | |
310 switch (x->op()) { | |
311 case Bytecodes::_lshl: set_constant(value << shift); return; | |
312 case Bytecodes::_lshr: set_constant(value >> shift); return; | |
313 case Bytecodes::_lushr: set_constant((value >> shift) & mask); return; | |
314 } | |
315 } | |
316 } | |
317 } | |
318 if (t2->is_constant()) { | |
319 switch (t2->tag()) { | |
320 case intTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return; | |
321 case longTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return; | |
322 default : ShouldNotReachHere(); | |
323 } | |
324 } | |
325 } | |
326 | |
327 | |
328 void Canonicalizer::do_LogicOp (LogicOp* x) { do_Op2(x); } | |
329 void Canonicalizer::do_CompareOp (CompareOp* x) { | |
330 if (x->x() == x->y()) { | |
331 switch (x->x()->type()->tag()) { | |
332 case longTag: set_constant(0); break; | |
333 case floatTag: { | |
334 FloatConstant* fc = x->x()->type()->as_FloatConstant(); | |
335 if (fc) { | |
336 if (g_isnan(fc->value())) { | |
337 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
338 } else { | |
339 set_constant(0); | |
340 } | |
341 } | |
342 break; | |
343 } | |
344 case doubleTag: { | |
345 DoubleConstant* dc = x->x()->type()->as_DoubleConstant(); | |
346 if (dc) { | |
347 if (g_isnan(dc->value())) { | |
348 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
349 } else { | |
350 set_constant(0); | |
351 } | |
352 } | |
353 break; | |
354 } | |
355 } | |
356 } else if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
357 switch (x->x()->type()->tag()) { | |
358 case longTag: { | |
359 jlong vx = x->x()->type()->as_LongConstant()->value(); | |
360 jlong vy = x->y()->type()->as_LongConstant()->value(); | |
361 if (vx == vy) | |
362 set_constant(0); | |
363 else if (vx < vy) | |
364 set_constant(-1); | |
365 else | |
366 set_constant(1); | |
367 break; | |
368 } | |
369 | |
370 case floatTag: { | |
371 float vx = x->x()->type()->as_FloatConstant()->value(); | |
372 float vy = x->y()->type()->as_FloatConstant()->value(); | |
373 if (g_isnan(vx) || g_isnan(vy)) | |
374 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
375 else if (vx == vy) | |
376 set_constant(0); | |
377 else if (vx < vy) | |
378 set_constant(-1); | |
379 else | |
380 set_constant(1); | |
381 break; | |
382 } | |
383 | |
384 case doubleTag: { | |
385 double vx = x->x()->type()->as_DoubleConstant()->value(); | |
386 double vy = x->y()->type()->as_DoubleConstant()->value(); | |
387 if (g_isnan(vx) || g_isnan(vy)) | |
388 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
389 else if (vx == vy) | |
390 set_constant(0); | |
391 else if (vx < vy) | |
392 set_constant(-1); | |
393 else | |
394 set_constant(1); | |
395 break; | |
396 } | |
397 } | |
398 | |
399 } | |
400 } | |
401 | |
402 | |
403 void Canonicalizer::do_IfInstanceOf(IfInstanceOf* x) {} | |
404 | |
405 void Canonicalizer::do_IfOp(IfOp* x) { | |
406 // Caution: do not use do_Op2(x) here for now since | |
407 // we map the condition to the op for now! | |
408 move_const_to_right(x); | |
409 } | |
410 | |
411 | |
412 void Canonicalizer::do_Intrinsic (Intrinsic* x) { | |
413 switch (x->id()) { | |
414 case vmIntrinsics::_floatToRawIntBits : { | |
415 FloatConstant* c = x->argument_at(0)->type()->as_FloatConstant(); | |
416 if (c != NULL) { | |
417 JavaValue v; | |
418 v.set_jfloat(c->value()); | |
419 set_constant(v.get_jint()); | |
420 } | |
421 break; | |
422 } | |
423 case vmIntrinsics::_intBitsToFloat : { | |
424 IntConstant* c = x->argument_at(0)->type()->as_IntConstant(); | |
425 if (c != NULL) { | |
426 JavaValue v; | |
427 v.set_jint(c->value()); | |
428 set_constant(v.get_jfloat()); | |
429 } | |
430 break; | |
431 } | |
432 case vmIntrinsics::_doubleToRawLongBits : { | |
433 DoubleConstant* c = x->argument_at(0)->type()->as_DoubleConstant(); | |
434 if (c != NULL) { | |
435 JavaValue v; | |
436 v.set_jdouble(c->value()); | |
437 set_constant(v.get_jlong()); | |
438 } | |
439 break; | |
440 } | |
441 case vmIntrinsics::_longBitsToDouble : { | |
442 LongConstant* c = x->argument_at(0)->type()->as_LongConstant(); | |
443 if (c != NULL) { | |
444 JavaValue v; | |
445 v.set_jlong(c->value()); | |
446 set_constant(v.get_jdouble()); | |
447 } | |
448 break; | |
449 } | |
450 } | |
451 } | |
452 | |
453 void Canonicalizer::do_Convert (Convert* x) { | |
454 if (x->value()->type()->is_constant()) { | |
455 switch (x->op()) { | |
456 case Bytecodes::_i2b: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 24) >> 24)); break; | |
457 case Bytecodes::_i2s: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 16) >> 16)); break; | |
458 case Bytecodes::_i2c: set_constant((int)(x->value()->type()->as_IntConstant()->value() & ((1<<16)-1))); break; | |
459 case Bytecodes::_i2l: set_constant((jlong)(x->value()->type()->as_IntConstant()->value())); break; | |
460 case Bytecodes::_i2f: set_constant((float)(x->value()->type()->as_IntConstant()->value())); break; | |
461 case Bytecodes::_i2d: set_constant((double)(x->value()->type()->as_IntConstant()->value())); break; | |
462 case Bytecodes::_l2i: set_constant((int)(x->value()->type()->as_LongConstant()->value())); break; | |
463 case Bytecodes::_l2f: set_constant(SharedRuntime::l2f(x->value()->type()->as_LongConstant()->value())); break; | |
464 case Bytecodes::_l2d: set_constant(SharedRuntime::l2d(x->value()->type()->as_LongConstant()->value())); break; | |
465 case Bytecodes::_f2d: set_constant((double)(x->value()->type()->as_FloatConstant()->value())); break; | |
466 case Bytecodes::_f2i: set_constant(SharedRuntime::f2i(x->value()->type()->as_FloatConstant()->value())); break; | |
467 case Bytecodes::_f2l: set_constant(SharedRuntime::f2l(x->value()->type()->as_FloatConstant()->value())); break; | |
468 case Bytecodes::_d2f: set_constant((float)(x->value()->type()->as_DoubleConstant()->value())); break; | |
469 case Bytecodes::_d2i: set_constant(SharedRuntime::d2i(x->value()->type()->as_DoubleConstant()->value())); break; | |
470 case Bytecodes::_d2l: set_constant(SharedRuntime::d2l(x->value()->type()->as_DoubleConstant()->value())); break; | |
471 default: | |
472 ShouldNotReachHere(); | |
473 } | |
474 } | |
475 | |
476 Value value = x->value(); | |
477 BasicType type = T_ILLEGAL; | |
478 LoadField* lf = value->as_LoadField(); | |
479 if (lf) { | |
480 type = lf->field_type(); | |
481 } else { | |
482 LoadIndexed* li = value->as_LoadIndexed(); | |
483 if (li) { | |
484 type = li->elt_type(); | |
485 } else { | |
486 Convert* conv = value->as_Convert(); | |
487 if (conv) { | |
488 switch (conv->op()) { | |
489 case Bytecodes::_i2b: type = T_BYTE; break; | |
490 case Bytecodes::_i2s: type = T_SHORT; break; | |
491 case Bytecodes::_i2c: type = T_CHAR; break; | |
492 } | |
493 } | |
494 } | |
495 } | |
496 if (type != T_ILLEGAL) { | |
497 switch (x->op()) { | |
498 case Bytecodes::_i2b: if (type == T_BYTE) set_canonical(x->value()); break; | |
499 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) set_canonical(x->value()); break; | |
500 case Bytecodes::_i2c: if (type == T_CHAR) set_canonical(x->value()); break; | |
501 } | |
502 } else { | |
503 Op2* op2 = x->value()->as_Op2(); | |
504 if (op2 && op2->op() == Bytecodes::_iand && op2->y()->type()->is_constant()) { | |
505 jint safebits = 0; | |
506 jint mask = op2->y()->type()->as_IntConstant()->value(); | |
507 switch (x->op()) { | |
508 case Bytecodes::_i2b: safebits = 0x7f; break; | |
509 case Bytecodes::_i2s: safebits = 0x7fff; break; | |
510 case Bytecodes::_i2c: safebits = 0xffff; break; | |
511 } | |
512 // When casting a masked integer to a smaller signed type, if | |
513 // the mask doesn't include the sign bit the cast isn't needed. | |
514 if (safebits && (mask & ~safebits) == 0) { | |
515 set_canonical(x->value()); | |
516 } | |
517 } | |
518 } | |
519 | |
520 } | |
521 | |
522 void Canonicalizer::do_NullCheck (NullCheck* x) { | |
523 if (x->obj()->as_NewArray() != NULL || x->obj()->as_NewInstance() != NULL) { | |
524 set_canonical(x->obj()); | |
525 } else { | |
526 Constant* con = x->obj()->as_Constant(); | |
527 if (con) { | |
528 ObjectType* c = con->type()->as_ObjectType(); | |
529 if (c && c->is_loaded()) { | |
530 ObjectConstant* oc = c->as_ObjectConstant(); | |
531 if (!oc || !oc->value()->is_null_object()) { | |
532 set_canonical(con); | |
533 } | |
534 } | |
535 } | |
536 } | |
537 } | |
538 | |
539 void Canonicalizer::do_Invoke (Invoke* x) {} | |
540 void Canonicalizer::do_NewInstance (NewInstance* x) {} | |
541 void Canonicalizer::do_NewTypeArray (NewTypeArray* x) {} | |
542 void Canonicalizer::do_NewObjectArray (NewObjectArray* x) {} | |
543 void Canonicalizer::do_NewMultiArray (NewMultiArray* x) {} | |
544 void Canonicalizer::do_CheckCast (CheckCast* x) { | |
545 if (x->klass()->is_loaded()) { | |
546 Value obj = x->obj(); | |
547 ciType* klass = obj->exact_type(); | |
548 if (klass == NULL) klass = obj->declared_type(); | |
549 if (klass != NULL && klass->is_loaded() && klass->is_subtype_of(x->klass())) { | |
550 set_canonical(obj); | |
551 return; | |
552 } | |
553 // checkcast of null returns null | |
554 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
555 set_canonical(obj); | |
556 } | |
557 } | |
558 } | |
559 void Canonicalizer::do_InstanceOf (InstanceOf* x) { | |
560 if (x->klass()->is_loaded()) { | |
561 Value obj = x->obj(); | |
562 ciType* exact = obj->exact_type(); | |
563 if (exact != NULL && exact->is_loaded() && (obj->as_NewInstance() || obj->as_NewArray())) { | |
564 set_constant(exact->is_subtype_of(x->klass()) ? 1 : 0); | |
565 return; | |
566 } | |
567 // instanceof null returns false | |
568 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
569 set_constant(0); | |
570 } | |
571 } | |
572 | |
573 } | |
574 void Canonicalizer::do_MonitorEnter (MonitorEnter* x) {} | |
575 void Canonicalizer::do_MonitorExit (MonitorExit* x) {} | |
576 void Canonicalizer::do_BlockBegin (BlockBegin* x) {} | |
577 void Canonicalizer::do_Goto (Goto* x) {} | |
578 | |
579 | |
580 static bool is_true(jlong x, If::Condition cond, jlong y) { | |
581 switch (cond) { | |
582 case If::eql: return x == y; | |
583 case If::neq: return x != y; | |
584 case If::lss: return x < y; | |
585 case If::leq: return x <= y; | |
586 case If::gtr: return x > y; | |
587 case If::geq: return x >= y; | |
588 } | |
589 ShouldNotReachHere(); | |
590 return false; | |
591 } | |
592 | |
593 | |
594 void Canonicalizer::do_If(If* x) { | |
595 // move const to right | |
596 if (x->x()->type()->is_constant()) x->swap_operands(); | |
597 // simplify | |
598 const Value l = x->x(); ValueType* lt = l->type(); | |
599 const Value r = x->y(); ValueType* rt = r->type(); | |
600 | |
601 if (l == r && !lt->is_float_kind()) { | |
602 // pattern: If (a cond a) => simplify to Goto | |
603 BlockBegin* sux; | |
604 switch (x->cond()) { | |
605 case If::eql: sux = x->sux_for(true); break; | |
606 case If::neq: sux = x->sux_for(false); break; | |
607 case If::lss: sux = x->sux_for(false); break; | |
608 case If::leq: sux = x->sux_for(true); break; | |
609 case If::gtr: sux = x->sux_for(false); break; | |
610 case If::geq: sux = x->sux_for(true); break; | |
611 } | |
612 // If is a safepoint then the debug information should come from the state_before of the If. | |
613 set_canonical(new Goto(sux, x->state_before(), x->is_safepoint())); | |
614 return; | |
615 } | |
616 | |
617 if (lt->is_constant() && rt->is_constant()) { | |
618 if (x->x()->as_Constant() != NULL) { | |
619 // pattern: If (lc cond rc) => simplify to: Goto | |
620 BlockBegin* sux = x->x()->as_Constant()->compare(x->cond(), x->y(), | |
621 x->sux_for(true), | |
622 x->sux_for(false)); | |
623 if (sux != NULL) { | |
624 // If is a safepoint then the debug information should come from the state_before of the If. | |
625 set_canonical(new Goto(sux, x->state_before(), x->is_safepoint())); | |
626 } | |
627 } | |
628 } else if (rt->as_IntConstant() != NULL) { | |
629 // pattern: If (l cond rc) => investigate further | |
630 const jint rc = rt->as_IntConstant()->value(); | |
631 if (l->as_CompareOp() != NULL) { | |
632 // pattern: If ((a cmp b) cond rc) => simplify to: If (x cond y) or: Goto | |
633 CompareOp* cmp = l->as_CompareOp(); | |
634 bool unordered_is_less = cmp->op() == Bytecodes::_fcmpl || cmp->op() == Bytecodes::_dcmpl; | |
635 BlockBegin* lss_sux = x->sux_for(is_true(-1, x->cond(), rc)); // successor for a < b | |
636 BlockBegin* eql_sux = x->sux_for(is_true( 0, x->cond(), rc)); // successor for a = b | |
637 BlockBegin* gtr_sux = x->sux_for(is_true(+1, x->cond(), rc)); // successor for a > b | |
638 BlockBegin* nan_sux = unordered_is_less ? lss_sux : gtr_sux ; // successor for unordered | |
639 // Note: At this point all successors (lss_sux, eql_sux, gtr_sux, nan_sux) are | |
640 // equal to x->tsux() or x->fsux(). Furthermore, nan_sux equals either | |
641 // lss_sux or gtr_sux. | |
642 if (lss_sux == eql_sux && eql_sux == gtr_sux) { | |
643 // all successors identical => simplify to: Goto | |
644 set_canonical(new Goto(lss_sux, x->state_before(), x->is_safepoint())); | |
645 } else { | |
646 // two successors differ and two successors are the same => simplify to: If (x cmp y) | |
647 // determine new condition & successors | |
648 If::Condition cond; | |
649 BlockBegin* tsux = NULL; | |
650 BlockBegin* fsux = NULL; | |
651 if (lss_sux == eql_sux) { cond = If::leq; tsux = lss_sux; fsux = gtr_sux; } | |
652 else if (lss_sux == gtr_sux) { cond = If::neq; tsux = lss_sux; fsux = eql_sux; } | |
653 else if (eql_sux == gtr_sux) { cond = If::geq; tsux = eql_sux; fsux = lss_sux; } | |
654 else { ShouldNotReachHere(); } | |
655 If* canon = new If(cmp->x(), cond, nan_sux == tsux, cmp->y(), tsux, fsux, cmp->state_before(), x->is_safepoint()); | |
656 if (cmp->x() == cmp->y()) { | |
657 do_If(canon); | |
658 } else { | |
659 set_canonical(canon); | |
660 set_bci(cmp->bci()); | |
661 } | |
662 } | |
663 } else if (l->as_InstanceOf() != NULL) { | |
664 // NOTE: Code permanently disabled for now since it leaves the old InstanceOf | |
665 // instruction in the graph (it is pinned). Need to fix this at some point. | |
666 return; | |
667 // pattern: If ((obj instanceof klass) cond rc) => simplify to: IfInstanceOf or: Goto | |
668 InstanceOf* inst = l->as_InstanceOf(); | |
669 BlockBegin* is_inst_sux = x->sux_for(is_true(1, x->cond(), rc)); // successor for instanceof == 1 | |
670 BlockBegin* no_inst_sux = x->sux_for(is_true(0, x->cond(), rc)); // successor for instanceof == 0 | |
671 if (is_inst_sux == no_inst_sux && inst->is_loaded()) { | |
672 // both successors identical and klass is loaded => simplify to: Goto | |
673 set_canonical(new Goto(is_inst_sux, x->state_before(), x->is_safepoint())); | |
674 } else { | |
675 // successors differ => simplify to: IfInstanceOf | |
676 set_canonical(new IfInstanceOf(inst->klass(), inst->obj(), true, inst->bci(), is_inst_sux, no_inst_sux)); | |
677 } | |
678 } | |
679 } else if (rt == objectNull && (l->as_NewInstance() || l->as_NewArray())) { | |
680 if (x->cond() == Instruction::eql) { | |
681 set_canonical(new Goto(x->fsux(), x->state_before(), x->is_safepoint())); | |
682 } else { | |
683 assert(x->cond() == Instruction::neq, "only other valid case"); | |
684 set_canonical(new Goto(x->tsux(), x->state_before(), x->is_safepoint())); | |
685 } | |
686 } | |
687 } | |
688 | |
689 | |
690 void Canonicalizer::do_TableSwitch(TableSwitch* x) { | |
691 if (x->tag()->type()->is_constant()) { | |
692 int v = x->tag()->type()->as_IntConstant()->value(); | |
693 BlockBegin* sux = x->default_sux(); | |
694 if (v >= x->lo_key() && v <= x->hi_key()) { | |
695 sux = x->sux_at(v - x->lo_key()); | |
696 } | |
697 set_canonical(new Goto(sux, x->state_before(), x->is_safepoint())); | |
698 } else if (x->number_of_sux() == 1) { | |
699 // NOTE: Code permanently disabled for now since the switch statement's | |
700 // tag expression may produce side-effects in which case it must | |
701 // be executed. | |
702 return; | |
703 // simplify to Goto | |
704 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
705 } else if (x->number_of_sux() == 2) { | |
706 // NOTE: Code permanently disabled for now since it produces two new nodes | |
707 // (Constant & If) and the Canonicalizer cannot return them correctly | |
708 // yet. For now we copied the corresponding code directly into the | |
709 // GraphBuilder (i.e., we should never reach here). | |
710 return; | |
711 // simplify to If | |
712 assert(x->lo_key() == x->hi_key(), "keys must be the same"); | |
713 Constant* key = new Constant(new IntConstant(x->lo_key())); | |
714 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
715 } | |
716 } | |
717 | |
718 | |
719 void Canonicalizer::do_LookupSwitch(LookupSwitch* x) { | |
720 if (x->tag()->type()->is_constant()) { | |
721 int v = x->tag()->type()->as_IntConstant()->value(); | |
722 BlockBegin* sux = x->default_sux(); | |
723 for (int i = 0; i < x->length(); i++) { | |
724 if (v == x->key_at(i)) { | |
725 sux = x->sux_at(i); | |
726 } | |
727 } | |
728 set_canonical(new Goto(sux, x->state_before(), x->is_safepoint())); | |
729 } else if (x->number_of_sux() == 1) { | |
730 // NOTE: Code permanently disabled for now since the switch statement's | |
731 // tag expression may produce side-effects in which case it must | |
732 // be executed. | |
733 return; | |
734 // simplify to Goto | |
735 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
736 } else if (x->number_of_sux() == 2) { | |
737 // NOTE: Code permanently disabled for now since it produces two new nodes | |
738 // (Constant & If) and the Canonicalizer cannot return them correctly | |
739 // yet. For now we copied the corresponding code directly into the | |
740 // GraphBuilder (i.e., we should never reach here). | |
741 return; | |
742 // simplify to If | |
743 assert(x->length() == 1, "length must be the same"); | |
744 Constant* key = new Constant(new IntConstant(x->key_at(0))); | |
745 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
746 } | |
747 } | |
748 | |
749 | |
750 void Canonicalizer::do_Return (Return* x) {} | |
751 void Canonicalizer::do_Throw (Throw* x) {} | |
752 void Canonicalizer::do_Base (Base* x) {} | |
753 void Canonicalizer::do_OsrEntry (OsrEntry* x) {} | |
754 void Canonicalizer::do_ExceptionObject(ExceptionObject* x) {} | |
755 | |
756 static bool match_index_and_scale(Instruction* instr, | |
757 Instruction** index, | |
758 int* log2_scale, | |
759 Instruction** instr_to_unpin) { | |
760 *instr_to_unpin = NULL; | |
761 | |
762 // Skip conversion ops | |
763 Convert* convert = instr->as_Convert(); | |
764 if (convert != NULL) { | |
765 instr = convert->value(); | |
766 } | |
767 | |
768 ShiftOp* shift = instr->as_ShiftOp(); | |
769 if (shift != NULL) { | |
770 if (shift->is_pinned()) { | |
771 *instr_to_unpin = shift; | |
772 } | |
773 // Constant shift value? | |
774 Constant* con = shift->y()->as_Constant(); | |
775 if (con == NULL) return false; | |
776 // Well-known type and value? | |
777 IntConstant* val = con->type()->as_IntConstant(); | |
778 if (val == NULL) return false; | |
779 if (shift->x()->type() != intType) return false; | |
780 *index = shift->x(); | |
781 int tmp_scale = val->value(); | |
782 if (tmp_scale >= 0 && tmp_scale < 4) { | |
783 *log2_scale = tmp_scale; | |
784 return true; | |
785 } else { | |
786 return false; | |
787 } | |
788 } | |
789 | |
790 ArithmeticOp* arith = instr->as_ArithmeticOp(); | |
791 if (arith != NULL) { | |
792 if (arith->is_pinned()) { | |
793 *instr_to_unpin = arith; | |
794 } | |
795 // Check for integer multiply | |
796 if (arith->op() == Bytecodes::_imul) { | |
797 // See if either arg is a known constant | |
798 Constant* con = arith->x()->as_Constant(); | |
799 if (con != NULL) { | |
800 *index = arith->y(); | |
801 } else { | |
802 con = arith->y()->as_Constant(); | |
803 if (con == NULL) return false; | |
804 *index = arith->x(); | |
805 } | |
806 if ((*index)->type() != intType) return false; | |
807 // Well-known type and value? | |
808 IntConstant* val = con->type()->as_IntConstant(); | |
809 if (val == NULL) return false; | |
810 switch (val->value()) { | |
811 case 1: *log2_scale = 0; return true; | |
812 case 2: *log2_scale = 1; return true; | |
813 case 4: *log2_scale = 2; return true; | |
814 case 8: *log2_scale = 3; return true; | |
815 default: return false; | |
816 } | |
817 } | |
818 } | |
819 | |
820 // Unknown instruction sequence; don't touch it | |
821 return false; | |
822 } | |
823 | |
824 | |
825 static bool match(UnsafeRawOp* x, | |
826 Instruction** base, | |
827 Instruction** index, | |
828 int* log2_scale) { | |
829 Instruction* instr_to_unpin = NULL; | |
830 ArithmeticOp* root = x->base()->as_ArithmeticOp(); | |
831 if (root == NULL) return false; | |
832 // Limit ourselves to addition for now | |
833 if (root->op() != Bytecodes::_ladd) return false; | |
834 // Try to find shift or scale op | |
835 if (match_index_and_scale(root->y(), index, log2_scale, &instr_to_unpin)) { | |
836 *base = root->x(); | |
837 } else if (match_index_and_scale(root->x(), index, log2_scale, &instr_to_unpin)) { | |
838 *base = root->y(); | |
839 } else if (root->y()->as_Convert() != NULL) { | |
840 Convert* convert = root->y()->as_Convert(); | |
841 if (convert->op() == Bytecodes::_i2l && convert->value()->type() == intType) { | |
842 // pick base and index, setting scale at 1 | |
843 *base = root->x(); | |
844 *index = convert->value(); | |
845 *log2_scale = 0; | |
846 } else { | |
847 return false; | |
848 } | |
849 } else { | |
850 // doesn't match any expected sequences | |
851 return false; | |
852 } | |
853 | |
854 // If the value is pinned then it will be always be computed so | |
855 // there's no profit to reshaping the expression. | |
856 return !root->is_pinned(); | |
857 } | |
858 | |
859 | |
860 void Canonicalizer::do_UnsafeRawOp(UnsafeRawOp* x) { | |
861 Instruction* base = NULL; | |
862 Instruction* index = NULL; | |
863 int log2_scale; | |
864 | |
865 if (match(x, &base, &index, &log2_scale)) { | |
866 x->set_base(base); | |
867 x->set_index(index); | |
868 x->set_log2_scale(log2_scale); | |
869 if (PrintUnsafeOptimization) { | |
870 tty->print_cr("Canonicalizer: UnsafeRawOp id %d: base = id %d, index = id %d, log2_scale = %d", | |
871 x->id(), x->base()->id(), x->index()->id(), x->log2_scale()); | |
872 } | |
873 } | |
874 } | |
875 | |
876 void Canonicalizer::do_RoundFP(RoundFP* x) {} | |
877 void Canonicalizer::do_UnsafeGetRaw(UnsafeGetRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
878 void Canonicalizer::do_UnsafePutRaw(UnsafePutRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
879 void Canonicalizer::do_UnsafeGetObject(UnsafeGetObject* x) {} | |
880 void Canonicalizer::do_UnsafePutObject(UnsafePutObject* x) {} | |
881 void Canonicalizer::do_UnsafePrefetchRead (UnsafePrefetchRead* x) {} | |
882 void Canonicalizer::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {} | |
883 void Canonicalizer::do_ProfileCall(ProfileCall* x) {} | |
884 void Canonicalizer::do_ProfileCounter(ProfileCounter* x) {} |