1 /*
2 * Copyright (c) 2014, 2025, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "opto/addnode.hpp"
26 #include "opto/castnode.hpp"
27 #include "opto/connode.hpp"
28 #include "opto/convertnode.hpp"
29 #include "opto/divnode.hpp"
30 #include "opto/matcher.hpp"
31 #include "opto/movenode.hpp"
32 #include "opto/mulnode.hpp"
33 #include "opto/phaseX.hpp"
34 #include "opto/subnode.hpp"
35 #include "runtime/stubRoutines.hpp"
36 #include "utilities/checkedCast.hpp"
37
38 //=============================================================================
39 //------------------------------Identity---------------------------------------
40 Node* Conv2BNode::Identity(PhaseGVN* phase) {
41 const Type *t = phase->type( in(1) );
42 if( t == Type::TOP ) return in(1);
43 if( t == TypeInt::ZERO ) return in(1);
44 if( t == TypeInt::ONE ) return in(1);
45 if( t == TypeInt::BOOL ) return in(1);
46 return this;
47 }
48
49 //------------------------------Value------------------------------------------
50 const Type* Conv2BNode::Value(PhaseGVN* phase) const {
51 const Type *t = phase->type( in(1) );
52 if( t == Type::TOP ) return Type::TOP;
53 if( t == TypeInt::ZERO ) return TypeInt::ZERO;
54 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO;
55 const TypePtr *tp = t->isa_ptr();
56 if(tp != nullptr) {
57 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP;
58 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE;
59 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE;
60 return TypeInt::BOOL;
61 }
62 if (t->base() != Type::Int) return TypeInt::BOOL;
63 const TypeInt *ti = t->is_int();
64 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE;
65 return TypeInt::BOOL;
66 }
67
68 Node* Conv2BNode::Ideal(PhaseGVN* phase, bool can_reshape) {
69 if (!Matcher::match_rule_supported(Op_Conv2B)) {
70 if (phase->C->post_loop_opts_phase()) {
71 // Get type of comparison to make
72 const Type* t = phase->type(in(1));
73 Node* cmp = nullptr;
74 if (t->isa_int()) {
75 cmp = phase->transform(new CmpINode(in(1), phase->intcon(0)));
76 } else if (t->isa_ptr()) {
77 cmp = phase->transform(new CmpPNode(in(1), phase->zerocon(BasicType::T_OBJECT)));
78 } else {
79 assert(false, "Unrecognized comparison for Conv2B: %s", NodeClassNames[in(1)->Opcode()]);
80 }
81
82 // Replace Conv2B with the cmove
83 Node* bol = phase->transform(new BoolNode(cmp, BoolTest::eq));
84 return new CMoveINode(bol, phase->intcon(1), phase->intcon(0), TypeInt::BOOL);
85 } else {
86 phase->C->record_for_post_loop_opts_igvn(this);
87 }
88 }
89 return nullptr;
90 }
91
92 uint ConvertNode::ideal_reg() const {
93 return _type->ideal_reg();
94 }
95
96 Node* ConvertNode::create_convert(BasicType source, BasicType target, Node* input) {
97 if (source == T_INT) {
98 if (target == T_LONG) {
99 return new ConvI2LNode(input);
100 } else if (target == T_FLOAT) {
101 return new ConvI2FNode(input);
102 } else if (target == T_DOUBLE) {
103 return new ConvI2DNode(input);
104 }
105 } else if (source == T_LONG) {
106 if (target == T_INT) {
107 return new ConvL2INode(input);
108 } else if (target == T_FLOAT) {
109 return new ConvL2FNode(input);
110 } else if (target == T_DOUBLE) {
111 return new ConvL2DNode(input);
112 }
113 } else if (source == T_FLOAT) {
114 if (target == T_INT) {
115 return new ConvF2INode(input);
116 } else if (target == T_LONG) {
117 return new ConvF2LNode(input);
118 } else if (target == T_DOUBLE) {
119 return new ConvF2DNode(input);
120 } else if (target == T_SHORT) {
121 return new ConvF2HFNode(input);
122 }
123 } else if (source == T_DOUBLE) {
124 if (target == T_INT) {
125 return new ConvD2INode(input);
126 } else if (target == T_LONG) {
127 return new ConvD2LNode(input);
128 } else if (target == T_FLOAT) {
129 return new ConvD2FNode(input);
130 }
131 } else if (source == T_SHORT) {
132 if (target == T_FLOAT) {
133 return new ConvHF2FNode(input);
134 }
135 }
136
137 assert(false, "Couldn't create conversion for type %s to %s", type2name(source), type2name(target));
138 return nullptr;
139 }
140
141 // The conversions operations are all Alpha sorted. Please keep it that way!
142 //=============================================================================
143 //------------------------------Value------------------------------------------
144 const Type* ConvD2FNode::Value(PhaseGVN* phase) const {
145 const Type *t = phase->type( in(1) );
146 if( t == Type::TOP ) return Type::TOP;
147 if( t == Type::DOUBLE ) return Type::FLOAT;
148 const TypeD *td = t->is_double_constant();
149 return TypeF::make( (float)td->getd() );
150 }
151
152 //------------------------------Ideal------------------------------------------
153 // If we see pattern ConvF2D SomeDoubleOp ConvD2F, do operation as float.
154 Node *ConvD2FNode::Ideal(PhaseGVN *phase, bool can_reshape) {
155 if ( in(1)->Opcode() == Op_SqrtD ) {
156 Node* sqrtd = in(1);
157 if ( sqrtd->in(1)->Opcode() == Op_ConvF2D ) {
158 if ( Matcher::match_rule_supported(Op_SqrtF) ) {
159 Node* convf2d = sqrtd->in(1);
160 return new SqrtFNode(phase->C, sqrtd->in(0), convf2d->in(1));
161 }
162 }
163 }
164 return nullptr;
165 }
166
167 //------------------------------Identity---------------------------------------
168 // Float's can be converted to doubles with no loss of bits. Hence
169 // converting a float to a double and back to a float is a NOP.
170 Node* ConvD2FNode::Identity(PhaseGVN* phase) {
171 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this;
172 }
173
174 //=============================================================================
175 //------------------------------Value------------------------------------------
176 const Type* ConvD2INode::Value(PhaseGVN* phase) const {
177 const Type *t = phase->type( in(1) );
178 if( t == Type::TOP ) return Type::TOP;
179 if( t == Type::DOUBLE ) return TypeInt::INT;
180 const TypeD *td = t->is_double_constant();
181 return TypeInt::make( SharedRuntime::d2i( td->getd() ) );
182 }
183
184 //------------------------------Identity---------------------------------------
185 // Int's can be converted to doubles with no loss of bits. Hence
186 // converting an integer to a double and back to an integer is a NOP.
187 Node* ConvD2INode::Identity(PhaseGVN* phase) {
188 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this;
189 }
190
191 //=============================================================================
192 //------------------------------Value------------------------------------------
193 const Type* ConvD2LNode::Value(PhaseGVN* phase) const {
194 const Type *t = phase->type( in(1) );
195 if( t == Type::TOP ) return Type::TOP;
196 if( t == Type::DOUBLE ) return TypeLong::LONG;
197 const TypeD *td = t->is_double_constant();
198 return TypeLong::make( SharedRuntime::d2l( td->getd() ) );
199 }
200
201 //------------------------------Identity---------------------------------------
202 Node* ConvD2LNode::Identity(PhaseGVN* phase) {
203 // Remove ConvD2L->ConvL2D->ConvD2L sequences.
204 if( in(1) ->Opcode() == Op_ConvL2D &&
205 in(1)->in(1)->Opcode() == Op_ConvD2L )
206 return in(1)->in(1);
207 return this;
208 }
209
210 //=============================================================================
211 //------------------------------Value------------------------------------------
212 const Type* ConvF2DNode::Value(PhaseGVN* phase) const {
213 const Type *t = phase->type( in(1) );
214 if( t == Type::TOP ) return Type::TOP;
215 if( t == Type::FLOAT ) return Type::DOUBLE;
216 const TypeF *tf = t->is_float_constant();
217 return TypeD::make( (double)tf->getf() );
218 }
219
220 //=============================================================================
221 //------------------------------Value------------------------------------------
222 const Type* ConvF2HFNode::Value(PhaseGVN* phase) const {
223 const Type *t = phase->type( in(1) );
224 if (t == Type::TOP) return Type::TOP;
225 if (t == Type::FLOAT || StubRoutines::f2hf_adr() == nullptr) {
226 return TypeInt::SHORT;
227 }
228
229 const TypeF *tf = t->is_float_constant();
230 return TypeInt::make( StubRoutines::f2hf(tf->getf()) );
231 }
232
233 //------------------------------Ideal------------------------------------------
234 Node* ConvF2HFNode::Ideal(PhaseGVN* phase, bool can_reshape) {
235 // Float16 instance encapsulates a short field holding IEEE 754
236 // binary16 value. On unboxing, this short field is loaded into a
237 // GPR register while FP operation operates over floating point
238 // registers. ConvHF2F converts incoming short value to a FP32 value
239 // to perform operation at FP32 granularity. However, if target
240 // support FP16 ISA we can save this redundant up casting and
241 // optimize the graph pallet using following transformation.
242 //
243 // ConvF2HF(FP32BinOp(ConvHF2F(x), ConvHF2F(y))) =>
244 // ReinterpretHF2S(FP16BinOp(ReinterpretS2HF(x), ReinterpretS2HF(y)))
245 //
246 // Please note we need to inject appropriate reinterpretation
247 // IR to move the values b/w GPR and floating point register
248 // before and after FP16 operation.
249
250 if (Float16NodeFactory::is_float32_binary_oper(in(1)->Opcode()) &&
251 in(1)->in(1)->Opcode() == Op_ConvHF2F &&
252 in(1)->in(2)->Opcode() == Op_ConvHF2F) {
253 if (Matcher::match_rule_supported(Float16NodeFactory::get_float16_binary_oper(in(1)->Opcode())) &&
254 Matcher::match_rule_supported(Op_ReinterpretS2HF) &&
255 Matcher::match_rule_supported(Op_ReinterpretHF2S)) {
256 Node* in1 = phase->transform(new ReinterpretS2HFNode(in(1)->in(1)->in(1)));
257 Node* in2 = phase->transform(new ReinterpretS2HFNode(in(1)->in(2)->in(1)));
258 Node* binop = phase->transform(Float16NodeFactory::make(in(1)->Opcode(), in(1)->in(0), in1, in2));
259 return new ReinterpretHF2SNode(binop);
260 }
261 }
262 return nullptr;
263 }
264 //=============================================================================
265 //------------------------------Value------------------------------------------
266 const Type* ConvF2INode::Value(PhaseGVN* phase) const {
267 const Type *t = phase->type( in(1) );
268 if( t == Type::TOP ) return Type::TOP;
269 if( t == Type::FLOAT ) return TypeInt::INT;
270 const TypeF *tf = t->is_float_constant();
271 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) );
272 }
273
274 //------------------------------Identity---------------------------------------
275 Node* ConvF2INode::Identity(PhaseGVN* phase) {
276 // Remove ConvF2I->ConvI2F->ConvF2I sequences.
277 if( in(1) ->Opcode() == Op_ConvI2F &&
278 in(1)->in(1)->Opcode() == Op_ConvF2I )
279 return in(1)->in(1);
280 return this;
281 }
282
283 //=============================================================================
284 //------------------------------Value------------------------------------------
285 const Type* ConvF2LNode::Value(PhaseGVN* phase) const {
286 const Type *t = phase->type( in(1) );
287 if( t == Type::TOP ) return Type::TOP;
288 if( t == Type::FLOAT ) return TypeLong::LONG;
289 const TypeF *tf = t->is_float_constant();
290 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) );
291 }
292
293 //------------------------------Identity---------------------------------------
294 Node* ConvF2LNode::Identity(PhaseGVN* phase) {
295 // Remove ConvF2L->ConvL2F->ConvF2L sequences.
296 if( in(1) ->Opcode() == Op_ConvL2F &&
297 in(1)->in(1)->Opcode() == Op_ConvF2L )
298 return in(1)->in(1);
299 return this;
300 }
301
302 //=============================================================================
303 //------------------------------Value------------------------------------------
304 const Type* ConvHF2FNode::Value(PhaseGVN* phase) const {
305 const Type *t = phase->type( in(1) );
306 if (t == Type::TOP) return Type::TOP;
307 if (t == TypeInt::SHORT || StubRoutines::hf2f_adr() == nullptr) {
308 return Type::FLOAT;
309 }
310
311 const TypeInt *ti = t->is_int();
312 if (ti->is_con()) {
313 return TypeF::make( StubRoutines::hf2f(ti->get_con()) );
314 }
315 return Type::FLOAT;
316 }
317
318 //=============================================================================
319 //------------------------------Value------------------------------------------
320 const Type* ConvI2DNode::Value(PhaseGVN* phase) const {
321 const Type *t = phase->type( in(1) );
322 if( t == Type::TOP ) return Type::TOP;
323 const TypeInt *ti = t->is_int();
324 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() );
325 return Type::DOUBLE;
326 }
327
328 //=============================================================================
329 //------------------------------Value------------------------------------------
330 const Type* ConvI2FNode::Value(PhaseGVN* phase) const {
331 const Type *t = phase->type( in(1) );
332 if( t == Type::TOP ) return Type::TOP;
333 const TypeInt *ti = t->is_int();
334 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() );
335 return Type::FLOAT;
336 }
337
338 //------------------------------Identity---------------------------------------
339 Node* ConvI2FNode::Identity(PhaseGVN* phase) {
340 // Remove ConvI2F->ConvF2I->ConvI2F sequences.
341 if( in(1) ->Opcode() == Op_ConvF2I &&
342 in(1)->in(1)->Opcode() == Op_ConvI2F )
343 return in(1)->in(1);
344 return this;
345 }
346
347 //=============================================================================
348 //------------------------------Value------------------------------------------
349 const Type* ConvI2LNode::Value(PhaseGVN* phase) const {
350 const Type *t = phase->type( in(1) );
351 if (t == Type::TOP) {
352 return Type::TOP;
353 }
354 const TypeInt *ti = t->is_int();
355 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen);
356 // Join my declared type against my incoming type.
357 tl = tl->filter(_type);
358 if (!tl->isa_long()) {
359 return tl;
360 }
361 const TypeLong* this_type = tl->is_long();
362 // Do NOT remove this node's type assertion until no more loop ops can happen.
363 if (phase->C->post_loop_opts_phase()) {
364 const TypeInt* in_type = phase->type(in(1))->isa_int();
365 if (in_type != nullptr &&
366 (in_type->_lo != this_type->_lo ||
367 in_type->_hi != this_type->_hi)) {
368 // Although this WORSENS the type, it increases GVN opportunities,
369 // because I2L nodes with the same input will common up, regardless
370 // of slightly differing type assertions. Such slight differences
371 // arise routinely as a result of loop unrolling, so this is a
372 // post-unrolling graph cleanup. Choose a type which depends only
373 // on my input. (Exception: Keep a range assertion of >=0 or <0.)
374 jlong lo1 = this_type->_lo;
375 jlong hi1 = this_type->_hi;
376 int w1 = this_type->_widen;
377 if (lo1 >= 0) {
378 // Keep a range assertion of >=0.
379 lo1 = 0; hi1 = max_jint;
380 } else if (hi1 < 0) {
381 // Keep a range assertion of <0.
382 lo1 = min_jint; hi1 = -1;
383 } else {
384 lo1 = min_jint; hi1 = max_jint;
385 }
386 return TypeLong::make(MAX2((jlong)in_type->_lo, lo1),
387 MIN2((jlong)in_type->_hi, hi1),
388 MAX2((int)in_type->_widen, w1));
389 }
390 }
391 return this_type;
392 }
393
394 Node* ConvI2LNode::Identity(PhaseGVN* phase) {
395 // If type is in "int" sub-range, we can
396 // convert I2L(L2I(x)) => x
397 // since the conversions have no effect.
398 if (in(1)->Opcode() == Op_ConvL2I) {
399 Node* x = in(1)->in(1);
400 const TypeLong* t = phase->type(x)->isa_long();
401 if (t != nullptr && t->_lo >= min_jint && t->_hi <= max_jint) {
402 return x;
403 }
404 }
405 return this;
406 }
407
408 #ifdef ASSERT
409 static inline bool long_ranges_overlap(jlong lo1, jlong hi1,
410 jlong lo2, jlong hi2) {
411 // Two ranges overlap iff one range's low point falls in the other range.
412 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1);
413 }
414 #endif
415
416 template<class T> static bool subtract_overflows(T x, T y) {
417 T s = java_subtract(x, y);
418 return (x >= 0) && (y < 0) && (s < 0);
419 }
420
421 template<class T> static bool subtract_underflows(T x, T y) {
422 T s = java_subtract(x, y);
423 return (x < 0) && (y > 0) && (s > 0);
424 }
425
426 template<class T> static bool add_overflows(T x, T y) {
427 T s = java_add(x, y);
428 return (x > 0) && (y > 0) && (s < 0);
429 }
430
431 template<class T> static bool add_underflows(T x, T y) {
432 T s = java_add(x, y);
433 return (x < 0) && (y < 0) && (s >= 0);
434 }
435
436 template<class T> static bool ranges_overlap(T xlo, T ylo, T xhi, T yhi, T zlo, T zhi,
437 const Node* n, bool pos) {
438 assert(xlo <= xhi && ylo <= yhi && zlo <= zhi, "should not be empty types");
439 T x_y_lo;
440 T x_y_hi;
441 bool x_y_lo_overflow;
442 bool x_y_hi_overflow;
443
444 if (n->is_Sub()) {
445 x_y_lo = java_subtract(xlo, yhi);
446 x_y_hi = java_subtract(xhi, ylo);
447 x_y_lo_overflow = pos ? subtract_overflows(xlo, yhi) : subtract_underflows(xlo, yhi);
448 x_y_hi_overflow = pos ? subtract_overflows(xhi, ylo) : subtract_underflows(xhi, ylo);
449 } else {
450 assert(n->is_Add(), "Add or Sub only");
451 x_y_lo = java_add(xlo, ylo);
452 x_y_hi = java_add(xhi, yhi);
453 x_y_lo_overflow = pos ? add_overflows(xlo, ylo) : add_underflows(xlo, ylo);
454 x_y_hi_overflow = pos ? add_overflows(xhi, yhi) : add_underflows(xhi, yhi);
455 }
456 assert(!pos || !x_y_lo_overflow || x_y_hi_overflow, "x_y_lo_overflow => x_y_hi_overflow");
457 assert(pos || !x_y_hi_overflow || x_y_lo_overflow, "x_y_hi_overflow => x_y_lo_overflow");
458
459 // Two ranges overlap iff one range's low point falls in the other range.
460 // nbits = 32 or 64
461 if (pos) {
462 // (zlo + 2**nbits <= x_y_lo && x_y_lo <= zhi ** nbits)
463 if (x_y_lo_overflow) {
464 if (zlo <= x_y_lo && x_y_lo <= zhi) {
465 return true;
466 }
467 }
468
469 // (x_y_lo <= zlo + 2**nbits && zlo + 2**nbits <= x_y_hi)
470 if (x_y_hi_overflow) {
471 if ((!x_y_lo_overflow || x_y_lo <= zlo) && zlo <= x_y_hi) {
472 return true;
473 }
474 }
475 } else {
476 // (zlo - 2**nbits <= x_y_hi && x_y_hi <= zhi - 2**nbits)
477 if (x_y_hi_overflow) {
478 if (zlo <= x_y_hi && x_y_hi <= zhi) {
479 return true;
480 }
481 }
482
483 // (x_y_lo <= zhi - 2**nbits && zhi - 2**nbits <= x_y_hi)
484 if (x_y_lo_overflow) {
485 if (x_y_lo <= zhi && (!x_y_hi_overflow || zhi <= x_y_hi)) {
486 return true;
487 }
488 }
489 }
490
491 return false;
492 }
493
494 static bool ranges_overlap(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
495 const Node* n, bool pos, BasicType bt) {
496 jlong xlo = tx->lo_as_long();
497 jlong xhi = tx->hi_as_long();
498 jlong ylo = ty->lo_as_long();
499 jlong yhi = ty->hi_as_long();
500 jlong zlo = tz->lo_as_long();
501 jlong zhi = tz->hi_as_long();
502
503 if (bt == T_INT) {
504 // See if x+y can cause positive overflow into z+2**32
505 // See if x+y can cause negative overflow into z-2**32
506 bool res = ranges_overlap(checked_cast<jint>(xlo), checked_cast<jint>(ylo),
507 checked_cast<jint>(xhi), checked_cast<jint>(yhi),
508 checked_cast<jint>(zlo), checked_cast<jint>(zhi), n, pos);
509 #ifdef ASSERT
510 jlong vbit = CONST64(1) << BitsPerInt;
511 if (n->Opcode() == Op_SubI) {
512 jlong ylo0 = ylo;
513 ylo = -yhi;
514 yhi = -ylo0;
515 }
516 assert(res == long_ranges_overlap(xlo+ylo, xhi+yhi, pos ? zlo+vbit : zlo-vbit, pos ? zhi+vbit : zhi-vbit), "inconsistent result");
517 #endif
518 return res;
519 }
520 assert(bt == T_LONG, "only int or long");
521 // See if x+y can cause positive overflow into z+2**64
522 // See if x+y can cause negative overflow into z-2**64
523 return ranges_overlap(xlo, ylo, xhi, yhi, zlo, zhi, n, pos);
524 }
525
526 #ifdef ASSERT
527 static bool compute_updates_ranges_verif(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
528 jlong& rxlo, jlong& rxhi, jlong& rylo, jlong& ryhi,
529 const Node* n) {
530 jlong xlo = tx->lo_as_long();
531 jlong xhi = tx->hi_as_long();
532 jlong ylo = ty->lo_as_long();
533 jlong yhi = ty->hi_as_long();
534 jlong zlo = tz->lo_as_long();
535 jlong zhi = tz->hi_as_long();
536 if (n->is_Sub()) {
537 swap(ylo, yhi);
538 ylo = -ylo;
539 yhi = -yhi;
540 }
541
542 rxlo = MAX2(xlo, zlo - yhi);
543 rxhi = MIN2(xhi, zhi - ylo);
544 rylo = MAX2(ylo, zlo - xhi);
545 ryhi = MIN2(yhi, zhi - xlo);
546 if (rxlo > rxhi || rylo > ryhi) {
547 return false;
548 }
549 if (n->is_Sub()) {
550 swap(rylo, ryhi);
551 rylo = -rylo;
552 ryhi = -ryhi;
553 }
554 assert(rxlo == (int) rxlo && rxhi == (int) rxhi, "x should not overflow");
555 assert(rylo == (int) rylo && ryhi == (int) ryhi, "y should not overflow");
556 return true;
557 }
558 #endif
559
560 template<class T> static bool compute_updates_ranges(T xlo, T ylo, T xhi, T yhi, T zlo, T zhi,
561 jlong& rxlo, jlong& rxhi, jlong& rylo, jlong& ryhi,
562 const Node* n) {
563 assert(xlo <= xhi && ylo <= yhi && zlo <= zhi, "should not be empty types");
564
565 // Now it's always safe to assume x+y does not overflow.
566 // This is true even if some pairs x,y might cause overflow, as long
567 // as that overflow value cannot fall into [zlo,zhi].
568
569 // Confident that the arithmetic is "as if infinite precision",
570 // we can now use n's range to put constraints on those of x and y.
571 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a
572 // more "restricted" range by intersecting [xlo,xhi] with the
573 // range obtained by subtracting y's range from the asserted range
574 // of the I2L conversion. Here's the interval arithmetic algebra:
575 // x == n-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo]
576 // => x in [zlo-yhi, zhi-ylo]
577 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi]
578 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo]
579 // And similarly, x changing place with y.
580 if (n->is_Sub()) {
581 if (add_overflows(zlo, ylo) || add_underflows(zhi, yhi) || subtract_underflows(xhi, zlo) ||
582 subtract_overflows(xlo, zhi)) {
583 return false;
584 }
585 rxlo = add_underflows(zlo, ylo) ? xlo : MAX2(xlo, java_add(zlo, ylo));
586 rxhi = add_overflows(zhi, yhi) ? xhi : MIN2(xhi, java_add(zhi, yhi));
587 ryhi = subtract_overflows(xhi, zlo) ? yhi : MIN2(yhi, java_subtract(xhi, zlo));
588 rylo = subtract_underflows(xlo, zhi) ? ylo : MAX2(ylo, java_subtract(xlo, zhi));
589 } else {
590 assert(n->is_Add(), "Add or Sub only");
591 if (subtract_overflows(zlo, yhi) || subtract_underflows(zhi, ylo) ||
592 subtract_overflows(zlo, xhi) || subtract_underflows(zhi, xlo)) {
593 return false;
594 }
595 rxlo = subtract_underflows(zlo, yhi) ? xlo : MAX2(xlo, java_subtract(zlo, yhi));
596 rxhi = subtract_overflows(zhi, ylo) ? xhi : MIN2(xhi, java_subtract(zhi, ylo));
597 rylo = subtract_underflows(zlo, xhi) ? ylo : MAX2(ylo, java_subtract(zlo, xhi));
598 ryhi = subtract_overflows(zhi, xlo) ? yhi : MIN2(yhi, java_subtract(zhi, xlo));
599 }
600
601 if (rxlo > rxhi || rylo > ryhi) {
602 return false; // x or y is dying; don't mess w/ it
603 }
604
605 return true;
606 }
607
608 static bool compute_updates_ranges(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
609 const TypeInteger*& rx, const TypeInteger*& ry,
610 const Node* n, const BasicType in_bt, BasicType out_bt) {
611
612 jlong xlo = tx->lo_as_long();
613 jlong xhi = tx->hi_as_long();
614 jlong ylo = ty->lo_as_long();
615 jlong yhi = ty->hi_as_long();
616 jlong zlo = tz->lo_as_long();
617 jlong zhi = tz->hi_as_long();
618 jlong rxlo, rxhi, rylo, ryhi;
619
620 if (in_bt == T_INT) {
621 #ifdef ASSERT
622 jlong expected_rxlo, expected_rxhi, expected_rylo, expected_ryhi;
623 bool expected = compute_updates_ranges_verif(tx, ty, tz,
624 expected_rxlo, expected_rxhi,
625 expected_rylo, expected_ryhi, n);
626 #endif
627 if (!compute_updates_ranges(checked_cast<jint>(xlo), checked_cast<jint>(ylo),
628 checked_cast<jint>(xhi), checked_cast<jint>(yhi),
629 checked_cast<jint>(zlo), checked_cast<jint>(zhi),
630 rxlo, rxhi, rylo, ryhi, n)) {
631 assert(!expected, "inconsistent");
632 return false;
633 }
634 assert(expected && rxlo == expected_rxlo && rxhi == expected_rxhi && rylo == expected_rylo && ryhi == expected_ryhi, "inconsistent");
635 } else {
636 if (!compute_updates_ranges(xlo, ylo, xhi, yhi, zlo, zhi,
637 rxlo, rxhi, rylo, ryhi, n)) {
638 return false;
639 }
640 }
641
642 int widen = MAX2(tx->widen_limit(), ty->widen_limit());
643 rx = TypeInteger::make(rxlo, rxhi, widen, out_bt);
644 ry = TypeInteger::make(rylo, ryhi, widen, out_bt);
645 return true;
646 }
647
648 #ifdef _LP64
649 // If there is an existing ConvI2L node with the given parent and type, return
650 // it. Otherwise, create and return a new one. Both reusing existing ConvI2L
651 // nodes and postponing the idealization of new ones are needed to avoid an
652 // explosion of recursive Ideal() calls when compiling long AddI chains.
653 static Node* find_or_make_convI2L(PhaseIterGVN* igvn, Node* parent,
654 const TypeLong* type) {
655 Node* n = new ConvI2LNode(parent, type);
656 Node* existing = igvn->hash_find_insert(n);
657 if (existing != nullptr) {
658 n->destruct(igvn);
659 return existing;
660 }
661 return igvn->register_new_node_with_optimizer(n);
662 }
663 #endif
664
665 bool Compile::push_thru_add(PhaseGVN* phase, Node* z, const TypeInteger* tz, const TypeInteger*& rx, const TypeInteger*& ry,
666 BasicType in_bt, BasicType out_bt) {
667 int op = z->Opcode();
668 if (op == Op_Add(in_bt) || op == Op_Sub(in_bt)) {
669 Node* x = z->in(1);
670 Node* y = z->in(2);
671 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal");
672 if (phase->type(x) == Type::TOP) {
673 return false;
674 }
675 if (phase->type(y) == Type::TOP) {
676 return false;
677 }
678 const TypeInteger* tx = phase->type(x)->is_integer(in_bt);
679 const TypeInteger* ty = phase->type(y)->is_integer(in_bt);
680
681 if (ranges_overlap(tx, ty, tz, z, true, in_bt) ||
682 ranges_overlap(tx, ty, tz, z, false, in_bt)) {
683 return false;
684 }
685 return compute_updates_ranges(tx, ty, tz, rx, ry, z, in_bt, out_bt);
686 }
687 return false;
688 }
689
690
691 //------------------------------Ideal------------------------------------------
692 Node* ConvI2LNode::Ideal(PhaseGVN* phase, bool can_reshape) {
693 if (in(1) != nullptr && phase->type(in(1)) != Type::TOP) {
694 Node* progress = TypeNode::Ideal(phase, can_reshape);
695 if (progress != nullptr) {
696 return progress;
697 }
698 }
699
700 const TypeLong* this_type = this->type()->is_long();
701 if (can_reshape && !phase->C->post_loop_opts_phase()) {
702 // makes sure we run ::Value to potentially remove type assertion after loop opts
703 phase->C->record_for_post_loop_opts_igvn(this);
704 }
705 #ifdef _LP64
706 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y))
707 // but only if x and y have subranges that cannot cause 32-bit overflow,
708 // under the assumption that x+y is in my own subrange this->type().
709
710 // This assumption is based on a constraint (i.e., type assertion)
711 // established in Parse::array_addressing or perhaps elsewhere.
712 // This constraint has been adjoined to the "natural" type of
713 // the incoming argument in(0). We know (because of runtime
714 // checks) - that the result value I2L(x+y) is in the joined range.
715 // Hence we can restrict the incoming terms (x, y) to values such
716 // that their sum also lands in that range.
717
718 // This optimization is useful only on 64-bit systems, where we hope
719 // the addition will end up subsumed in an addressing mode.
720 // It is necessary to do this when optimizing an unrolled array
721 // copy loop such as x[i++] = y[i++].
722
723 // On 32-bit systems, it's better to perform as much 32-bit math as
724 // possible before the I2L conversion, because 32-bit math is cheaper.
725 // There's no common reason to "leak" a constant offset through the I2L.
726 // Addressing arithmetic will not absorb it as part of a 64-bit AddL.
727 PhaseIterGVN* igvn = phase->is_IterGVN();
728 Node* z = in(1);
729 const TypeInteger* rx = nullptr;
730 const TypeInteger* ry = nullptr;
731 if (Compile::push_thru_add(phase, z, this_type, rx, ry, T_INT, T_LONG)) {
732 if (igvn == nullptr) {
733 // Postpone this optimization to iterative GVN, where we can handle deep
734 // AddI chains without an exponential number of recursive Ideal() calls.
735 phase->record_for_igvn(this);
736 return nullptr;
737 }
738 int op = z->Opcode();
739 Node* x = z->in(1);
740 Node* y = z->in(2);
741
742 Node* cx = find_or_make_convI2L(igvn, x, rx->is_long());
743 Node* cy = find_or_make_convI2L(igvn, y, ry->is_long());
744 switch (op) {
745 case Op_AddI: return new AddLNode(cx, cy);
746 case Op_SubI: return new SubLNode(cx, cy);
747 default: ShouldNotReachHere();
748 }
749 }
750 #endif //_LP64
751
752 return nullptr;
753 }
754
755 //=============================================================================
756 //------------------------------Value------------------------------------------
757 const Type* ConvL2DNode::Value(PhaseGVN* phase) const {
758 const Type *t = phase->type( in(1) );
759 if( t == Type::TOP ) return Type::TOP;
760 const TypeLong *tl = t->is_long();
761 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() );
762 return Type::DOUBLE;
763 }
764
765 //=============================================================================
766 //------------------------------Value------------------------------------------
767 const Type* ConvL2FNode::Value(PhaseGVN* phase) const {
768 const Type *t = phase->type( in(1) );
769 if( t == Type::TOP ) return Type::TOP;
770 const TypeLong *tl = t->is_long();
771 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() );
772 return Type::FLOAT;
773 }
774
775 //=============================================================================
776 //----------------------------Identity-----------------------------------------
777 Node* ConvL2INode::Identity(PhaseGVN* phase) {
778 // Convert L2I(I2L(x)) => x
779 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1);
780 return this;
781 }
782
783 //------------------------------Value------------------------------------------
784 const Type* ConvL2INode::Value(PhaseGVN* phase) const {
785 const Type *t = phase->type( in(1) );
786 if( t == Type::TOP ) return Type::TOP;
787 const TypeLong *tl = t->is_long();
788 const TypeInt* ti = TypeInt::INT;
789 if (tl->is_con()) {
790 // Easy case.
791 ti = TypeInt::make((jint)tl->get_con());
792 } else if (tl->_lo >= min_jint && tl->_hi <= max_jint) {
793 ti = TypeInt::make((jint)tl->_lo, (jint)tl->_hi, tl->_widen);
794 }
795 return ti->filter(_type);
796 }
797
798 //------------------------------Ideal------------------------------------------
799 // Return a node which is more "ideal" than the current node.
800 // Blow off prior masking to int
801 Node* ConvL2INode::Ideal(PhaseGVN* phase, bool can_reshape) {
802 if (in(1) != nullptr && phase->type(in(1)) != Type::TOP) {
803 Node* progress = TypeNode::Ideal(phase, can_reshape);
804 if (progress != nullptr) {
805 return progress;
806 }
807 }
808
809 Node *andl = in(1);
810 uint andl_op = andl->Opcode();
811 if( andl_op == Op_AndL ) {
812 // Blow off prior masking to int
813 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) {
814 set_req_X(1,andl->in(1), phase);
815 return this;
816 }
817 }
818
819 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y))
820 // This replaces an 'AddL' with an 'AddI'.
821 if( andl_op == Op_AddL ) {
822 // Don't do this for nodes which have more than one user since
823 // we'll end up computing the long add anyway.
824 if (andl->outcnt() > 1) return nullptr;
825
826 Node* x = andl->in(1);
827 Node* y = andl->in(2);
828 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" );
829 if (phase->type(x) == Type::TOP) return nullptr;
830 if (phase->type(y) == Type::TOP) return nullptr;
831 Node *add1 = phase->transform(new ConvL2INode(x));
832 Node *add2 = phase->transform(new ConvL2INode(y));
833 return new AddINode(add1,add2);
834 }
835
836 // Disable optimization: LoadL->ConvL2I ==> LoadI.
837 // It causes problems (sizes of Load and Store nodes do not match)
838 // in objects initialization code and Escape Analysis.
839 return nullptr;
840 }
841
842 //=============================================================================
843 RoundDoubleModeNode* RoundDoubleModeNode::make(PhaseGVN& gvn, Node* arg, RoundDoubleModeNode::RoundingMode rmode) {
844 ConINode* rm = gvn.intcon(rmode);
845 return new RoundDoubleModeNode(arg, (Node *)rm);
846 }
847
848 //------------------------------Identity---------------------------------------
849 // Remove redundant roundings.
850 Node* RoundDoubleModeNode::Identity(PhaseGVN* phase) {
851 int op = in(1)->Opcode();
852 // Redundant rounding e.g. floor(ceil(n)) -> ceil(n)
853 if(op == Op_RoundDoubleMode) return in(1);
854 return this;
855 }
856 const Type* RoundDoubleModeNode::Value(PhaseGVN* phase) const {
857 return Type::DOUBLE;
858 }
859 //=============================================================================
860
861 const Type* ReinterpretS2HFNode::Value(PhaseGVN* phase) const {
862 const Type* type = phase->type(in(1));
863 // Convert short constant value to a Half Float constant value
864 if ((type->isa_int() && type->is_int()->is_con())) {
865 jshort hfval = type->is_int()->get_con();
866 return TypeH::make(hfval);
867 }
868 return Type::HALF_FLOAT;
869 }
870
871 Node* ReinterpretS2HFNode::Identity(PhaseGVN* phase) {
872 if (in(1)->Opcode() == Op_ReinterpretHF2S) {
873 assert(in(1)->in(1)->bottom_type()->isa_half_float(), "");
874 return in(1)->in(1);
875 }
876 return this;
877 }
878
879 const Type* ReinterpretHF2SNode::Value(PhaseGVN* phase) const {
880 const Type* type = phase->type(in(1));
881 // Convert Half float constant value to short constant value.
882 if (type->isa_half_float_constant()) {
883 jshort hfval = type->is_half_float_constant()->_f;
884 return TypeInt::make(hfval);
885 }
886 return TypeInt::SHORT;
887 }
888
889 bool Float16NodeFactory::is_float32_binary_oper(int opc) {
890 switch(opc) {
891 case Op_AddF:
892 case Op_SubF:
893 case Op_MulF:
894 case Op_DivF:
895 case Op_MaxF:
896 case Op_MinF:
897 return true;
898 default:
899 return false;
900 }
901 }
902
903 int Float16NodeFactory::get_float16_binary_oper(int opc) {
904 switch(opc) {
905 case Op_AddF:
906 return Op_AddHF;
907 case Op_SubF:
908 return Op_SubHF;
909 case Op_MulF:
910 return Op_MulHF;
911 case Op_DivF:
912 return Op_DivHF;
913 case Op_MaxF:
914 return Op_MaxHF;
915 case Op_MinF:
916 return Op_MinHF;
917 default: ShouldNotReachHere();
918 }
919 }
920
921 Node* Float16NodeFactory::make(int opc, Node* c, Node* in1, Node* in2) {
922 switch(opc) {
923 case Op_AddF: return new AddHFNode(in1, in2);
924 case Op_SubF: return new SubHFNode(in1, in2);
925 case Op_MulF: return new MulHFNode(in1, in2);
926 case Op_DivF: return new DivHFNode(c, in1, in2);
927 case Op_MaxF: return new MaxHFNode(in1, in2);
928 case Op_MinF: return new MinHFNode(in1, in2);
929 default: ShouldNotReachHere();
930 }
931 }
--- EOF ---