Mercurial > hg > truffle
annotate src/share/vm/c1/c1_Canonicalizer.cpp @ 14517:3812c088b945
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author | lana |
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date | Thu, 06 Mar 2014 10:37:26 -0800 |
parents | de6a9e811145 |
children | 4ca6dc0799b6 a60a1309a03a |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1999, 2013, 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 |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "c1/c1_Canonicalizer.hpp" | |
27 #include "c1/c1_InstructionPrinter.hpp" | |
28 #include "c1/c1_ValueStack.hpp" | |
29 #include "ci/ciArray.hpp" | |
30 #include "runtime/sharedRuntime.hpp" | |
0 | 31 |
32 | |
1584 | 33 class PrintValueVisitor: public ValueVisitor { |
34 void visit(Value* vp) { | |
35 (*vp)->print_line(); | |
36 } | |
37 }; | |
0 | 38 |
39 void Canonicalizer::set_canonical(Value x) { | |
40 assert(x != NULL, "value must exist"); | |
41 // Note: we can not currently substitute root nodes which show up in | |
42 // the instruction stream (because the instruction list is embedded | |
43 // in the instructions). | |
44 if (canonical() != x) { | |
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45 #ifndef PRODUCT |
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46 if (!x->has_printable_bci()) { |
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47 x->set_printable_bci(bci()); |
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48 } |
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49 #endif |
0 | 50 if (PrintCanonicalization) { |
1584 | 51 PrintValueVisitor do_print_value; |
52 canonical()->input_values_do(&do_print_value); | |
0 | 53 canonical()->print_line(); |
54 tty->print_cr("canonicalized to:"); | |
1584 | 55 x->input_values_do(&do_print_value); |
0 | 56 x->print_line(); |
57 tty->cr(); | |
58 } | |
59 assert(_canonical->type()->tag() == x->type()->tag(), "types must match"); | |
60 _canonical = x; | |
61 } | |
62 } | |
63 | |
64 | |
65 void Canonicalizer::move_const_to_right(Op2* x) { | |
66 if (x->x()->type()->is_constant() && x->is_commutative()) x->swap_operands(); | |
67 } | |
68 | |
69 | |
70 void Canonicalizer::do_Op2(Op2* x) { | |
71 if (x->x() == x->y()) { | |
72 switch (x->op()) { | |
73 case Bytecodes::_isub: set_constant(0); return; | |
74 case Bytecodes::_lsub: set_constant(jlong_cast(0)); return; | |
75 case Bytecodes::_iand: // fall through | |
76 case Bytecodes::_land: // fall through | |
77 case Bytecodes::_ior: // fall through | |
78 case Bytecodes::_lor : set_canonical(x->x()); return; | |
79 case Bytecodes::_ixor: set_constant(0); return; | |
80 case Bytecodes::_lxor: set_constant(jlong_cast(0)); return; | |
81 } | |
82 } | |
83 | |
84 if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
85 // do constant folding for selected operations | |
86 switch (x->type()->tag()) { | |
87 case intTag: | |
88 { jint a = x->x()->type()->as_IntConstant()->value(); | |
89 jint b = x->y()->type()->as_IntConstant()->value(); | |
90 switch (x->op()) { | |
91 case Bytecodes::_iadd: set_constant(a + b); return; | |
92 case Bytecodes::_isub: set_constant(a - b); return; | |
93 case Bytecodes::_imul: set_constant(a * b); return; | |
94 case Bytecodes::_idiv: | |
95 if (b != 0) { | |
96 if (a == min_jint && b == -1) { | |
97 set_constant(min_jint); | |
98 } else { | |
99 set_constant(a / b); | |
100 } | |
101 return; | |
102 } | |
103 break; | |
104 case Bytecodes::_irem: | |
105 if (b != 0) { | |
106 if (a == min_jint && b == -1) { | |
107 set_constant(0); | |
108 } else { | |
109 set_constant(a % b); | |
110 } | |
111 return; | |
112 } | |
113 break; | |
114 case Bytecodes::_iand: set_constant(a & b); return; | |
115 case Bytecodes::_ior : set_constant(a | b); return; | |
116 case Bytecodes::_ixor: set_constant(a ^ b); return; | |
117 } | |
118 } | |
119 break; | |
120 case longTag: | |
121 { jlong a = x->x()->type()->as_LongConstant()->value(); | |
122 jlong b = x->y()->type()->as_LongConstant()->value(); | |
123 switch (x->op()) { | |
124 case Bytecodes::_ladd: set_constant(a + b); return; | |
125 case Bytecodes::_lsub: set_constant(a - b); return; | |
126 case Bytecodes::_lmul: set_constant(a * b); return; | |
127 case Bytecodes::_ldiv: | |
128 if (b != 0) { | |
129 set_constant(SharedRuntime::ldiv(b, a)); | |
130 return; | |
131 } | |
132 break; | |
133 case Bytecodes::_lrem: | |
134 if (b != 0) { | |
135 set_constant(SharedRuntime::lrem(b, a)); | |
136 return; | |
137 } | |
138 break; | |
139 case Bytecodes::_land: set_constant(a & b); return; | |
140 case Bytecodes::_lor : set_constant(a | b); return; | |
141 case Bytecodes::_lxor: set_constant(a ^ b); return; | |
142 } | |
143 } | |
144 break; | |
145 // other cases not implemented (must be extremely careful with floats & doubles!) | |
146 } | |
147 } | |
148 // make sure constant is on the right side, if any | |
149 move_const_to_right(x); | |
150 | |
151 if (x->y()->type()->is_constant()) { | |
152 // do constant folding for selected operations | |
153 switch (x->type()->tag()) { | |
154 case intTag: | |
155 if (x->y()->type()->as_IntConstant()->value() == 0) { | |
156 switch (x->op()) { | |
157 case Bytecodes::_iadd: set_canonical(x->x()); return; | |
158 case Bytecodes::_isub: set_canonical(x->x()); return; | |
159 case Bytecodes::_imul: set_constant(0); return; | |
160 // Note: for div and rem, make sure that C semantics | |
161 // corresponds to Java semantics! | |
162 case Bytecodes::_iand: set_constant(0); return; | |
163 case Bytecodes::_ior : set_canonical(x->x()); return; | |
164 } | |
165 } | |
166 break; | |
167 case longTag: | |
168 if (x->y()->type()->as_LongConstant()->value() == (jlong)0) { | |
169 switch (x->op()) { | |
170 case Bytecodes::_ladd: set_canonical(x->x()); return; | |
171 case Bytecodes::_lsub: set_canonical(x->x()); return; | |
172 case Bytecodes::_lmul: set_constant((jlong)0); return; | |
173 // Note: for div and rem, make sure that C semantics | |
174 // corresponds to Java semantics! | |
175 case Bytecodes::_land: set_constant((jlong)0); return; | |
176 case Bytecodes::_lor : set_canonical(x->x()); return; | |
177 } | |
178 } | |
179 break; | |
180 } | |
181 } | |
182 } | |
183 | |
184 | |
185 void Canonicalizer::do_Phi (Phi* x) {} | |
186 void Canonicalizer::do_Constant (Constant* x) {} | |
187 void Canonicalizer::do_Local (Local* x) {} | |
188 void Canonicalizer::do_LoadField (LoadField* x) {} | |
189 | |
190 // checks if v is in the block that is currently processed by | |
191 // GraphBuilder. This is the only block that has not BlockEnd yet. | |
192 static bool in_current_block(Value v) { | |
193 int max_distance = 4; | |
194 while (max_distance > 0 && v != NULL && v->as_BlockEnd() == NULL) { | |
195 v = v->next(); | |
196 max_distance--; | |
197 } | |
198 return v == NULL; | |
199 } | |
200 | |
201 void Canonicalizer::do_StoreField (StoreField* x) { | |
202 // If a value is going to be stored into a field or array some of | |
203 // the conversions emitted by javac are unneeded because the fields | |
204 // are packed to their natural size. | |
205 Convert* conv = x->value()->as_Convert(); | |
206 if (conv) { | |
207 Value value = NULL; | |
208 BasicType type = x->field()->type()->basic_type(); | |
209 switch (conv->op()) { | |
210 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
211 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
212 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
213 } | |
214 // limit this optimization to current block | |
215 if (value != NULL && in_current_block(conv)) { | |
216 set_canonical(new StoreField(x->obj(), x->offset(), x->field(), value, x->is_static(), | |
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217 x->state_before(), x->needs_patching())); |
0 | 218 return; |
219 } | |
220 } | |
221 | |
222 } | |
223 | |
224 void Canonicalizer::do_ArrayLength (ArrayLength* x) { | |
225 NewArray* array = x->array()->as_NewArray(); | |
226 if (array != NULL && array->length() != NULL) { | |
227 Constant* length = array->length()->as_Constant(); | |
228 if (length != NULL) { | |
229 // do not use the Constant itself, but create a new Constant | |
230 // with same value Otherwise a Constant is live over multiple | |
231 // blocks without being registered in a state array. | |
232 assert(length->type()->as_IntConstant() != NULL, "array length must be integer"); | |
233 set_constant(length->type()->as_IntConstant()->value()); | |
234 } | |
235 } else { | |
236 LoadField* lf = x->array()->as_LoadField(); | |
1295 | 237 if (lf != NULL) { |
238 ciField* field = lf->field(); | |
239 if (field->is_constant() && field->is_static()) { | |
240 // final static field | |
241 ciObject* c = field->constant_value().as_object(); | |
242 if (c->is_array()) { | |
243 ciArray* array = (ciArray*) c; | |
244 set_constant(array->length()); | |
245 } | |
0 | 246 } |
247 } | |
248 } | |
249 } | |
250 | |
251 void Canonicalizer::do_LoadIndexed (LoadIndexed* x) {} | |
252 void Canonicalizer::do_StoreIndexed (StoreIndexed* x) { | |
253 // If a value is going to be stored into a field or array some of | |
254 // the conversions emitted by javac are unneeded because the fields | |
255 // are packed to their natural size. | |
256 Convert* conv = x->value()->as_Convert(); | |
257 if (conv) { | |
258 Value value = NULL; | |
259 BasicType type = x->elt_type(); | |
260 switch (conv->op()) { | |
261 case Bytecodes::_i2b: if (type == T_BYTE) value = conv->value(); break; | |
262 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) value = conv->value(); break; | |
263 case Bytecodes::_i2c: if (type == T_CHAR || type == T_BYTE) value = conv->value(); break; | |
264 } | |
265 // limit this optimization to current block | |
266 if (value != NULL && in_current_block(conv)) { | |
267 set_canonical(new StoreIndexed(x->array(), x->index(), x->length(), | |
1819 | 268 x->elt_type(), value, x->state_before())); |
0 | 269 return; |
270 } | |
271 } | |
272 | |
273 | |
274 } | |
275 | |
276 | |
277 void Canonicalizer::do_NegateOp(NegateOp* x) { | |
278 ValueType* t = x->x()->type(); | |
279 if (t->is_constant()) { | |
280 switch (t->tag()) { | |
281 case intTag : set_constant(-t->as_IntConstant ()->value()); return; | |
282 case longTag : set_constant(-t->as_LongConstant ()->value()); return; | |
283 case floatTag : set_constant(-t->as_FloatConstant ()->value()); return; | |
284 case doubleTag: set_constant(-t->as_DoubleConstant()->value()); return; | |
285 default : ShouldNotReachHere(); | |
286 } | |
287 } | |
288 } | |
289 | |
290 | |
291 void Canonicalizer::do_ArithmeticOp (ArithmeticOp* x) { do_Op2(x); } | |
292 | |
293 | |
294 void Canonicalizer::do_ShiftOp (ShiftOp* x) { | |
295 ValueType* t = x->x()->type(); | |
296 ValueType* t2 = x->y()->type(); | |
297 if (t->is_constant()) { | |
298 switch (t->tag()) { | |
299 case intTag : if (t->as_IntConstant()->value() == 0) { set_constant(0); return; } break; | |
300 case longTag : if (t->as_LongConstant()->value() == (jlong)0) { set_constant(jlong_cast(0)); return; } break; | |
301 default : ShouldNotReachHere(); | |
302 } | |
303 if (t2->is_constant()) { | |
304 if (t->tag() == intTag) { | |
305 int value = t->as_IntConstant()->value(); | |
306 int shift = t2->as_IntConstant()->value() & 31; | |
307 jint mask = ~(~0 << (32 - shift)); | |
308 if (shift == 0) mask = ~0; | |
309 switch (x->op()) { | |
310 case Bytecodes::_ishl: set_constant(value << shift); return; | |
311 case Bytecodes::_ishr: set_constant(value >> shift); return; | |
312 case Bytecodes::_iushr: set_constant((value >> shift) & mask); return; | |
313 } | |
314 } else if (t->tag() == longTag) { | |
315 jlong value = t->as_LongConstant()->value(); | |
316 int shift = t2->as_IntConstant()->value() & 63; | |
317 jlong mask = ~(~jlong_cast(0) << (64 - shift)); | |
318 if (shift == 0) mask = ~jlong_cast(0); | |
319 switch (x->op()) { | |
320 case Bytecodes::_lshl: set_constant(value << shift); return; | |
321 case Bytecodes::_lshr: set_constant(value >> shift); return; | |
322 case Bytecodes::_lushr: set_constant((value >> shift) & mask); return; | |
323 } | |
324 } | |
325 } | |
326 } | |
327 if (t2->is_constant()) { | |
328 switch (t2->tag()) { | |
329 case intTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return; | |
330 case longTag : if (t2->as_IntConstant()->value() == 0) set_canonical(x->x()); return; | |
331 default : ShouldNotReachHere(); | |
332 } | |
333 } | |
334 } | |
335 | |
336 | |
337 void Canonicalizer::do_LogicOp (LogicOp* x) { do_Op2(x); } | |
338 void Canonicalizer::do_CompareOp (CompareOp* x) { | |
339 if (x->x() == x->y()) { | |
340 switch (x->x()->type()->tag()) { | |
341 case longTag: set_constant(0); break; | |
342 case floatTag: { | |
343 FloatConstant* fc = x->x()->type()->as_FloatConstant(); | |
344 if (fc) { | |
345 if (g_isnan(fc->value())) { | |
346 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
347 } else { | |
348 set_constant(0); | |
349 } | |
350 } | |
351 break; | |
352 } | |
353 case doubleTag: { | |
354 DoubleConstant* dc = x->x()->type()->as_DoubleConstant(); | |
355 if (dc) { | |
356 if (g_isnan(dc->value())) { | |
357 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
358 } else { | |
359 set_constant(0); | |
360 } | |
361 } | |
362 break; | |
363 } | |
364 } | |
365 } else if (x->x()->type()->is_constant() && x->y()->type()->is_constant()) { | |
366 switch (x->x()->type()->tag()) { | |
367 case longTag: { | |
368 jlong vx = x->x()->type()->as_LongConstant()->value(); | |
369 jlong vy = x->y()->type()->as_LongConstant()->value(); | |
370 if (vx == vy) | |
371 set_constant(0); | |
372 else if (vx < vy) | |
373 set_constant(-1); | |
374 else | |
375 set_constant(1); | |
376 break; | |
377 } | |
378 | |
379 case floatTag: { | |
380 float vx = x->x()->type()->as_FloatConstant()->value(); | |
381 float vy = x->y()->type()->as_FloatConstant()->value(); | |
382 if (g_isnan(vx) || g_isnan(vy)) | |
383 set_constant(x->op() == Bytecodes::_fcmpl ? -1 : 1); | |
384 else if (vx == vy) | |
385 set_constant(0); | |
386 else if (vx < vy) | |
387 set_constant(-1); | |
388 else | |
389 set_constant(1); | |
390 break; | |
391 } | |
392 | |
393 case doubleTag: { | |
394 double vx = x->x()->type()->as_DoubleConstant()->value(); | |
395 double vy = x->y()->type()->as_DoubleConstant()->value(); | |
396 if (g_isnan(vx) || g_isnan(vy)) | |
397 set_constant(x->op() == Bytecodes::_dcmpl ? -1 : 1); | |
398 else if (vx == vy) | |
399 set_constant(0); | |
400 else if (vx < vy) | |
401 set_constant(-1); | |
402 else | |
403 set_constant(1); | |
404 break; | |
405 } | |
406 } | |
407 | |
408 } | |
409 } | |
410 | |
411 | |
412 void Canonicalizer::do_IfInstanceOf(IfInstanceOf* x) {} | |
413 | |
414 void Canonicalizer::do_IfOp(IfOp* x) { | |
415 // Caution: do not use do_Op2(x) here for now since | |
416 // we map the condition to the op for now! | |
417 move_const_to_right(x); | |
418 } | |
419 | |
420 | |
421 void Canonicalizer::do_Intrinsic (Intrinsic* x) { | |
422 switch (x->id()) { | |
423 case vmIntrinsics::_floatToRawIntBits : { | |
424 FloatConstant* c = x->argument_at(0)->type()->as_FloatConstant(); | |
425 if (c != NULL) { | |
426 JavaValue v; | |
427 v.set_jfloat(c->value()); | |
428 set_constant(v.get_jint()); | |
429 } | |
430 break; | |
431 } | |
432 case vmIntrinsics::_intBitsToFloat : { | |
433 IntConstant* c = x->argument_at(0)->type()->as_IntConstant(); | |
434 if (c != NULL) { | |
435 JavaValue v; | |
436 v.set_jint(c->value()); | |
437 set_constant(v.get_jfloat()); | |
438 } | |
439 break; | |
440 } | |
441 case vmIntrinsics::_doubleToRawLongBits : { | |
442 DoubleConstant* c = x->argument_at(0)->type()->as_DoubleConstant(); | |
443 if (c != NULL) { | |
444 JavaValue v; | |
445 v.set_jdouble(c->value()); | |
446 set_constant(v.get_jlong()); | |
447 } | |
448 break; | |
449 } | |
450 case vmIntrinsics::_longBitsToDouble : { | |
451 LongConstant* c = x->argument_at(0)->type()->as_LongConstant(); | |
452 if (c != NULL) { | |
453 JavaValue v; | |
454 v.set_jlong(c->value()); | |
455 set_constant(v.get_jdouble()); | |
456 } | |
457 break; | |
458 } | |
6135 | 459 case vmIntrinsics::_isInstance : { |
460 assert(x->number_of_arguments() == 2, "wrong type"); | |
461 | |
462 InstanceConstant* c = x->argument_at(0)->type()->as_InstanceConstant(); | |
463 if (c != NULL && !c->value()->is_null_object()) { | |
464 // ciInstance::java_mirror_type() returns non-NULL only for Java mirrors | |
465 ciType* t = c->value()->as_instance()->java_mirror_type(); | |
466 if (t->is_klass()) { | |
467 // substitute cls.isInstance(obj) of a constant Class into | |
468 // an InstantOf instruction | |
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469 InstanceOf* i = new InstanceOf(t->as_klass(), x->argument_at(1), x->state_before()); |
6135 | 470 set_canonical(i); |
471 // and try to canonicalize even further | |
472 do_InstanceOf(i); | |
473 } else { | |
474 assert(t->is_primitive_type(), "should be a primitive type"); | |
475 // cls.isInstance(obj) always returns false for primitive classes | |
476 set_constant(0); | |
477 } | |
478 } | |
479 break; | |
480 } | |
0 | 481 } |
482 } | |
483 | |
484 void Canonicalizer::do_Convert (Convert* x) { | |
485 if (x->value()->type()->is_constant()) { | |
486 switch (x->op()) { | |
487 case Bytecodes::_i2b: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 24) >> 24)); break; | |
488 case Bytecodes::_i2s: set_constant((int)((x->value()->type()->as_IntConstant()->value() << 16) >> 16)); break; | |
489 case Bytecodes::_i2c: set_constant((int)(x->value()->type()->as_IntConstant()->value() & ((1<<16)-1))); break; | |
490 case Bytecodes::_i2l: set_constant((jlong)(x->value()->type()->as_IntConstant()->value())); break; | |
491 case Bytecodes::_i2f: set_constant((float)(x->value()->type()->as_IntConstant()->value())); break; | |
492 case Bytecodes::_i2d: set_constant((double)(x->value()->type()->as_IntConstant()->value())); break; | |
493 case Bytecodes::_l2i: set_constant((int)(x->value()->type()->as_LongConstant()->value())); break; | |
494 case Bytecodes::_l2f: set_constant(SharedRuntime::l2f(x->value()->type()->as_LongConstant()->value())); break; | |
495 case Bytecodes::_l2d: set_constant(SharedRuntime::l2d(x->value()->type()->as_LongConstant()->value())); break; | |
496 case Bytecodes::_f2d: set_constant((double)(x->value()->type()->as_FloatConstant()->value())); break; | |
497 case Bytecodes::_f2i: set_constant(SharedRuntime::f2i(x->value()->type()->as_FloatConstant()->value())); break; | |
498 case Bytecodes::_f2l: set_constant(SharedRuntime::f2l(x->value()->type()->as_FloatConstant()->value())); break; | |
499 case Bytecodes::_d2f: set_constant((float)(x->value()->type()->as_DoubleConstant()->value())); break; | |
500 case Bytecodes::_d2i: set_constant(SharedRuntime::d2i(x->value()->type()->as_DoubleConstant()->value())); break; | |
501 case Bytecodes::_d2l: set_constant(SharedRuntime::d2l(x->value()->type()->as_DoubleConstant()->value())); break; | |
502 default: | |
503 ShouldNotReachHere(); | |
504 } | |
505 } | |
506 | |
507 Value value = x->value(); | |
508 BasicType type = T_ILLEGAL; | |
509 LoadField* lf = value->as_LoadField(); | |
510 if (lf) { | |
511 type = lf->field_type(); | |
512 } else { | |
513 LoadIndexed* li = value->as_LoadIndexed(); | |
514 if (li) { | |
515 type = li->elt_type(); | |
516 } else { | |
517 Convert* conv = value->as_Convert(); | |
518 if (conv) { | |
519 switch (conv->op()) { | |
520 case Bytecodes::_i2b: type = T_BYTE; break; | |
521 case Bytecodes::_i2s: type = T_SHORT; break; | |
522 case Bytecodes::_i2c: type = T_CHAR; break; | |
523 } | |
524 } | |
525 } | |
526 } | |
527 if (type != T_ILLEGAL) { | |
528 switch (x->op()) { | |
529 case Bytecodes::_i2b: if (type == T_BYTE) set_canonical(x->value()); break; | |
530 case Bytecodes::_i2s: if (type == T_SHORT || type == T_BYTE) set_canonical(x->value()); break; | |
531 case Bytecodes::_i2c: if (type == T_CHAR) set_canonical(x->value()); break; | |
532 } | |
533 } else { | |
534 Op2* op2 = x->value()->as_Op2(); | |
535 if (op2 && op2->op() == Bytecodes::_iand && op2->y()->type()->is_constant()) { | |
536 jint safebits = 0; | |
537 jint mask = op2->y()->type()->as_IntConstant()->value(); | |
538 switch (x->op()) { | |
539 case Bytecodes::_i2b: safebits = 0x7f; break; | |
540 case Bytecodes::_i2s: safebits = 0x7fff; break; | |
541 case Bytecodes::_i2c: safebits = 0xffff; break; | |
542 } | |
543 // When casting a masked integer to a smaller signed type, if | |
544 // the mask doesn't include the sign bit the cast isn't needed. | |
545 if (safebits && (mask & ~safebits) == 0) { | |
546 set_canonical(x->value()); | |
547 } | |
548 } | |
549 } | |
550 | |
551 } | |
552 | |
553 void Canonicalizer::do_NullCheck (NullCheck* x) { | |
554 if (x->obj()->as_NewArray() != NULL || x->obj()->as_NewInstance() != NULL) { | |
555 set_canonical(x->obj()); | |
556 } else { | |
557 Constant* con = x->obj()->as_Constant(); | |
558 if (con) { | |
559 ObjectType* c = con->type()->as_ObjectType(); | |
560 if (c && c->is_loaded()) { | |
561 ObjectConstant* oc = c->as_ObjectConstant(); | |
562 if (!oc || !oc->value()->is_null_object()) { | |
563 set_canonical(con); | |
564 } | |
565 } | |
566 } | |
567 } | |
568 } | |
569 | |
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570 void Canonicalizer::do_TypeCast (TypeCast* x) {} |
0 | 571 void Canonicalizer::do_Invoke (Invoke* x) {} |
572 void Canonicalizer::do_NewInstance (NewInstance* x) {} | |
573 void Canonicalizer::do_NewTypeArray (NewTypeArray* x) {} | |
574 void Canonicalizer::do_NewObjectArray (NewObjectArray* x) {} | |
575 void Canonicalizer::do_NewMultiArray (NewMultiArray* x) {} | |
576 void Canonicalizer::do_CheckCast (CheckCast* x) { | |
577 if (x->klass()->is_loaded()) { | |
578 Value obj = x->obj(); | |
579 ciType* klass = obj->exact_type(); | |
580 if (klass == NULL) klass = obj->declared_type(); | |
581 if (klass != NULL && klass->is_loaded() && klass->is_subtype_of(x->klass())) { | |
582 set_canonical(obj); | |
583 return; | |
584 } | |
585 // checkcast of null returns null | |
586 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
587 set_canonical(obj); | |
588 } | |
589 } | |
590 } | |
591 void Canonicalizer::do_InstanceOf (InstanceOf* x) { | |
592 if (x->klass()->is_loaded()) { | |
593 Value obj = x->obj(); | |
594 ciType* exact = obj->exact_type(); | |
595 if (exact != NULL && exact->is_loaded() && (obj->as_NewInstance() || obj->as_NewArray())) { | |
596 set_constant(exact->is_subtype_of(x->klass()) ? 1 : 0); | |
597 return; | |
598 } | |
599 // instanceof null returns false | |
600 if (obj->as_Constant() && obj->type()->as_ObjectType()->constant_value()->is_null_object()) { | |
601 set_constant(0); | |
602 } | |
603 } | |
604 | |
605 } | |
606 void Canonicalizer::do_MonitorEnter (MonitorEnter* x) {} | |
607 void Canonicalizer::do_MonitorExit (MonitorExit* x) {} | |
608 void Canonicalizer::do_BlockBegin (BlockBegin* x) {} | |
609 void Canonicalizer::do_Goto (Goto* x) {} | |
610 | |
611 | |
612 static bool is_true(jlong x, If::Condition cond, jlong y) { | |
613 switch (cond) { | |
614 case If::eql: return x == y; | |
615 case If::neq: return x != y; | |
616 case If::lss: return x < y; | |
617 case If::leq: return x <= y; | |
618 case If::gtr: return x > y; | |
619 case If::geq: return x >= y; | |
620 } | |
621 ShouldNotReachHere(); | |
622 return false; | |
623 } | |
624 | |
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625 static bool is_safepoint(BlockEnd* x, BlockBegin* sux) { |
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626 // An Instruction with multiple successors, x, is replaced by a Goto |
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627 // to a single successor, sux. Is a safepoint check needed = was the |
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628 // instruction being replaced a safepoint and the single remaining |
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629 // successor a back branch? |
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630 return x->is_safepoint() && (sux->bci() < x->state_before()->bci()); |
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631 } |
0 | 632 |
633 void Canonicalizer::do_If(If* x) { | |
634 // move const to right | |
635 if (x->x()->type()->is_constant()) x->swap_operands(); | |
636 // simplify | |
637 const Value l = x->x(); ValueType* lt = l->type(); | |
638 const Value r = x->y(); ValueType* rt = r->type(); | |
639 | |
640 if (l == r && !lt->is_float_kind()) { | |
641 // pattern: If (a cond a) => simplify to Goto | |
642 BlockBegin* sux; | |
643 switch (x->cond()) { | |
644 case If::eql: sux = x->sux_for(true); break; | |
645 case If::neq: sux = x->sux_for(false); break; | |
646 case If::lss: sux = x->sux_for(false); break; | |
647 case If::leq: sux = x->sux_for(true); break; | |
648 case If::gtr: sux = x->sux_for(false); break; | |
649 case If::geq: sux = x->sux_for(true); break; | |
650 } | |
651 // If is a safepoint then the debug information should come from the state_before of the If. | |
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652 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 653 return; |
654 } | |
655 | |
656 if (lt->is_constant() && rt->is_constant()) { | |
657 if (x->x()->as_Constant() != NULL) { | |
658 // pattern: If (lc cond rc) => simplify to: Goto | |
659 BlockBegin* sux = x->x()->as_Constant()->compare(x->cond(), x->y(), | |
660 x->sux_for(true), | |
661 x->sux_for(false)); | |
662 if (sux != NULL) { | |
663 // If is a safepoint then the debug information should come from the state_before of the If. | |
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664 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 665 } |
666 } | |
667 } else if (rt->as_IntConstant() != NULL) { | |
668 // pattern: If (l cond rc) => investigate further | |
669 const jint rc = rt->as_IntConstant()->value(); | |
670 if (l->as_CompareOp() != NULL) { | |
671 // pattern: If ((a cmp b) cond rc) => simplify to: If (x cond y) or: Goto | |
672 CompareOp* cmp = l->as_CompareOp(); | |
673 bool unordered_is_less = cmp->op() == Bytecodes::_fcmpl || cmp->op() == Bytecodes::_dcmpl; | |
674 BlockBegin* lss_sux = x->sux_for(is_true(-1, x->cond(), rc)); // successor for a < b | |
675 BlockBegin* eql_sux = x->sux_for(is_true( 0, x->cond(), rc)); // successor for a = b | |
676 BlockBegin* gtr_sux = x->sux_for(is_true(+1, x->cond(), rc)); // successor for a > b | |
677 BlockBegin* nan_sux = unordered_is_less ? lss_sux : gtr_sux ; // successor for unordered | |
678 // Note: At this point all successors (lss_sux, eql_sux, gtr_sux, nan_sux) are | |
679 // equal to x->tsux() or x->fsux(). Furthermore, nan_sux equals either | |
680 // lss_sux or gtr_sux. | |
681 if (lss_sux == eql_sux && eql_sux == gtr_sux) { | |
682 // all successors identical => simplify to: Goto | |
683 set_canonical(new Goto(lss_sux, x->state_before(), x->is_safepoint())); | |
684 } else { | |
685 // two successors differ and two successors are the same => simplify to: If (x cmp y) | |
686 // determine new condition & successors | |
687 If::Condition cond; | |
688 BlockBegin* tsux = NULL; | |
689 BlockBegin* fsux = NULL; | |
690 if (lss_sux == eql_sux) { cond = If::leq; tsux = lss_sux; fsux = gtr_sux; } | |
691 else if (lss_sux == gtr_sux) { cond = If::neq; tsux = lss_sux; fsux = eql_sux; } | |
692 else if (eql_sux == gtr_sux) { cond = If::geq; tsux = eql_sux; fsux = lss_sux; } | |
693 else { ShouldNotReachHere(); } | |
1783 | 694 If* canon = new If(cmp->x(), cond, nan_sux == tsux, cmp->y(), tsux, fsux, cmp->state_before(), x->is_safepoint()); |
0 | 695 if (cmp->x() == cmp->y()) { |
696 do_If(canon); | |
697 } else { | |
1783 | 698 if (compilation()->profile_branches()) { |
699 // TODO: If profiling, leave floating point comparisons unoptimized. | |
700 // We currently do not support profiling of the unordered case. | |
701 switch(cmp->op()) { | |
702 case Bytecodes::_fcmpl: case Bytecodes::_fcmpg: | |
703 case Bytecodes::_dcmpl: case Bytecodes::_dcmpg: | |
704 set_canonical(x); | |
705 return; | |
706 } | |
707 } | |
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708 set_bci(cmp->state_before()->bci()); |
0 | 709 set_canonical(canon); |
710 } | |
711 } | |
712 } else if (l->as_InstanceOf() != NULL) { | |
713 // NOTE: Code permanently disabled for now since it leaves the old InstanceOf | |
714 // instruction in the graph (it is pinned). Need to fix this at some point. | |
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715 // It should also be left in the graph when generating a profiled method version or Goto |
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716 // has to know that it was an InstanceOf. |
0 | 717 return; |
718 // pattern: If ((obj instanceof klass) cond rc) => simplify to: IfInstanceOf or: Goto | |
719 InstanceOf* inst = l->as_InstanceOf(); | |
720 BlockBegin* is_inst_sux = x->sux_for(is_true(1, x->cond(), rc)); // successor for instanceof == 1 | |
721 BlockBegin* no_inst_sux = x->sux_for(is_true(0, x->cond(), rc)); // successor for instanceof == 0 | |
722 if (is_inst_sux == no_inst_sux && inst->is_loaded()) { | |
723 // both successors identical and klass is loaded => simplify to: Goto | |
724 set_canonical(new Goto(is_inst_sux, x->state_before(), x->is_safepoint())); | |
725 } else { | |
726 // successors differ => simplify to: IfInstanceOf | |
1819 | 727 set_canonical(new IfInstanceOf(inst->klass(), inst->obj(), true, inst->state_before()->bci(), is_inst_sux, no_inst_sux)); |
0 | 728 } |
729 } | |
730 } else if (rt == objectNull && (l->as_NewInstance() || l->as_NewArray())) { | |
731 if (x->cond() == Instruction::eql) { | |
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732 BlockBegin* sux = x->fsux(); |
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733 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 734 } else { |
735 assert(x->cond() == Instruction::neq, "only other valid case"); | |
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736 BlockBegin* sux = x->tsux(); |
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737 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 738 } |
739 } | |
740 } | |
741 | |
742 | |
743 void Canonicalizer::do_TableSwitch(TableSwitch* x) { | |
744 if (x->tag()->type()->is_constant()) { | |
745 int v = x->tag()->type()->as_IntConstant()->value(); | |
746 BlockBegin* sux = x->default_sux(); | |
747 if (v >= x->lo_key() && v <= x->hi_key()) { | |
748 sux = x->sux_at(v - x->lo_key()); | |
749 } | |
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750 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 751 } else if (x->number_of_sux() == 1) { |
752 // NOTE: Code permanently disabled for now since the switch statement's | |
753 // tag expression may produce side-effects in which case it must | |
754 // be executed. | |
755 return; | |
756 // simplify to Goto | |
757 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
758 } else if (x->number_of_sux() == 2) { | |
759 // NOTE: Code permanently disabled for now since it produces two new nodes | |
760 // (Constant & If) and the Canonicalizer cannot return them correctly | |
761 // yet. For now we copied the corresponding code directly into the | |
762 // GraphBuilder (i.e., we should never reach here). | |
763 return; | |
764 // simplify to If | |
765 assert(x->lo_key() == x->hi_key(), "keys must be the same"); | |
766 Constant* key = new Constant(new IntConstant(x->lo_key())); | |
767 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
768 } | |
769 } | |
770 | |
771 | |
772 void Canonicalizer::do_LookupSwitch(LookupSwitch* x) { | |
773 if (x->tag()->type()->is_constant()) { | |
774 int v = x->tag()->type()->as_IntConstant()->value(); | |
775 BlockBegin* sux = x->default_sux(); | |
776 for (int i = 0; i < x->length(); i++) { | |
777 if (v == x->key_at(i)) { | |
778 sux = x->sux_at(i); | |
779 } | |
780 } | |
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781 set_canonical(new Goto(sux, x->state_before(), is_safepoint(x, sux))); |
0 | 782 } else if (x->number_of_sux() == 1) { |
783 // NOTE: Code permanently disabled for now since the switch statement's | |
784 // tag expression may produce side-effects in which case it must | |
785 // be executed. | |
786 return; | |
787 // simplify to Goto | |
788 set_canonical(new Goto(x->default_sux(), x->state_before(), x->is_safepoint())); | |
789 } else if (x->number_of_sux() == 2) { | |
790 // NOTE: Code permanently disabled for now since it produces two new nodes | |
791 // (Constant & If) and the Canonicalizer cannot return them correctly | |
792 // yet. For now we copied the corresponding code directly into the | |
793 // GraphBuilder (i.e., we should never reach here). | |
794 return; | |
795 // simplify to If | |
796 assert(x->length() == 1, "length must be the same"); | |
797 Constant* key = new Constant(new IntConstant(x->key_at(0))); | |
798 set_canonical(new If(x->tag(), If::eql, true, key, x->sux_at(0), x->default_sux(), x->state_before(), x->is_safepoint())); | |
799 } | |
800 } | |
801 | |
802 | |
803 void Canonicalizer::do_Return (Return* x) {} | |
804 void Canonicalizer::do_Throw (Throw* x) {} | |
805 void Canonicalizer::do_Base (Base* x) {} | |
806 void Canonicalizer::do_OsrEntry (OsrEntry* x) {} | |
807 void Canonicalizer::do_ExceptionObject(ExceptionObject* x) {} | |
808 | |
809 static bool match_index_and_scale(Instruction* instr, | |
810 Instruction** index, | |
811 int* log2_scale, | |
812 Instruction** instr_to_unpin) { | |
813 *instr_to_unpin = NULL; | |
814 | |
815 // Skip conversion ops | |
816 Convert* convert = instr->as_Convert(); | |
817 if (convert != NULL) { | |
818 instr = convert->value(); | |
819 } | |
820 | |
821 ShiftOp* shift = instr->as_ShiftOp(); | |
822 if (shift != NULL) { | |
823 if (shift->is_pinned()) { | |
824 *instr_to_unpin = shift; | |
825 } | |
826 // Constant shift value? | |
827 Constant* con = shift->y()->as_Constant(); | |
828 if (con == NULL) return false; | |
829 // Well-known type and value? | |
830 IntConstant* val = con->type()->as_IntConstant(); | |
831 if (val == NULL) return false; | |
832 if (shift->x()->type() != intType) return false; | |
833 *index = shift->x(); | |
834 int tmp_scale = val->value(); | |
835 if (tmp_scale >= 0 && tmp_scale < 4) { | |
836 *log2_scale = tmp_scale; | |
837 return true; | |
838 } else { | |
839 return false; | |
840 } | |
841 } | |
842 | |
843 ArithmeticOp* arith = instr->as_ArithmeticOp(); | |
844 if (arith != NULL) { | |
845 if (arith->is_pinned()) { | |
846 *instr_to_unpin = arith; | |
847 } | |
848 // Check for integer multiply | |
849 if (arith->op() == Bytecodes::_imul) { | |
850 // See if either arg is a known constant | |
851 Constant* con = arith->x()->as_Constant(); | |
852 if (con != NULL) { | |
853 *index = arith->y(); | |
854 } else { | |
855 con = arith->y()->as_Constant(); | |
856 if (con == NULL) return false; | |
857 *index = arith->x(); | |
858 } | |
859 if ((*index)->type() != intType) return false; | |
860 // Well-known type and value? | |
861 IntConstant* val = con->type()->as_IntConstant(); | |
862 if (val == NULL) return false; | |
863 switch (val->value()) { | |
864 case 1: *log2_scale = 0; return true; | |
865 case 2: *log2_scale = 1; return true; | |
866 case 4: *log2_scale = 2; return true; | |
867 case 8: *log2_scale = 3; return true; | |
868 default: return false; | |
869 } | |
870 } | |
871 } | |
872 | |
873 // Unknown instruction sequence; don't touch it | |
874 return false; | |
875 } | |
876 | |
877 | |
878 static bool match(UnsafeRawOp* x, | |
879 Instruction** base, | |
880 Instruction** index, | |
881 int* log2_scale) { | |
882 Instruction* instr_to_unpin = NULL; | |
883 ArithmeticOp* root = x->base()->as_ArithmeticOp(); | |
884 if (root == NULL) return false; | |
885 // Limit ourselves to addition for now | |
886 if (root->op() != Bytecodes::_ladd) return false; | |
887 // Try to find shift or scale op | |
888 if (match_index_and_scale(root->y(), index, log2_scale, &instr_to_unpin)) { | |
889 *base = root->x(); | |
890 } else if (match_index_and_scale(root->x(), index, log2_scale, &instr_to_unpin)) { | |
891 *base = root->y(); | |
892 } else if (root->y()->as_Convert() != NULL) { | |
893 Convert* convert = root->y()->as_Convert(); | |
894 if (convert->op() == Bytecodes::_i2l && convert->value()->type() == intType) { | |
895 // pick base and index, setting scale at 1 | |
896 *base = root->x(); | |
897 *index = convert->value(); | |
898 *log2_scale = 0; | |
899 } else { | |
900 return false; | |
901 } | |
902 } else { | |
903 // doesn't match any expected sequences | |
904 return false; | |
905 } | |
906 | |
907 // If the value is pinned then it will be always be computed so | |
908 // there's no profit to reshaping the expression. | |
909 return !root->is_pinned(); | |
910 } | |
911 | |
912 | |
913 void Canonicalizer::do_UnsafeRawOp(UnsafeRawOp* x) { | |
914 Instruction* base = NULL; | |
915 Instruction* index = NULL; | |
916 int log2_scale; | |
917 | |
918 if (match(x, &base, &index, &log2_scale)) { | |
919 x->set_base(base); | |
920 x->set_index(index); | |
921 x->set_log2_scale(log2_scale); | |
922 if (PrintUnsafeOptimization) { | |
923 tty->print_cr("Canonicalizer: UnsafeRawOp id %d: base = id %d, index = id %d, log2_scale = %d", | |
924 x->id(), x->base()->id(), x->index()->id(), x->log2_scale()); | |
925 } | |
926 } | |
927 } | |
928 | |
929 void Canonicalizer::do_RoundFP(RoundFP* x) {} | |
930 void Canonicalizer::do_UnsafeGetRaw(UnsafeGetRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
931 void Canonicalizer::do_UnsafePutRaw(UnsafePutRaw* x) { if (OptimizeUnsafes) do_UnsafeRawOp(x); } | |
932 void Canonicalizer::do_UnsafeGetObject(UnsafeGetObject* x) {} | |
933 void Canonicalizer::do_UnsafePutObject(UnsafePutObject* x) {} | |
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934 void Canonicalizer::do_UnsafeGetAndSetObject(UnsafeGetAndSetObject* x) {} |
0 | 935 void Canonicalizer::do_UnsafePrefetchRead (UnsafePrefetchRead* x) {} |
936 void Canonicalizer::do_UnsafePrefetchWrite(UnsafePrefetchWrite* x) {} | |
937 void Canonicalizer::do_ProfileCall(ProfileCall* x) {} | |
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938 void Canonicalizer::do_ProfileReturnType(ProfileReturnType* x) {} |
1783 | 939 void Canonicalizer::do_ProfileInvoke(ProfileInvoke* x) {} |
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940 void Canonicalizer::do_RuntimeCall(RuntimeCall* x) {} |
8860 | 941 void Canonicalizer::do_RangeCheckPredicate(RangeCheckPredicate* x) {} |
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942 #ifdef ASSERT |
8860 | 943 void Canonicalizer::do_Assert(Assert* x) {} |
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944 #endif |
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945 void Canonicalizer::do_MemBar(MemBar* x) {} |