1 /*
2 * Copyright (c) 2014, 2023, 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 "precompiled.hpp"
26 #include "opto/addnode.hpp"
27 #include "opto/castnode.hpp"
28 #include "opto/connode.hpp"
29 #include "opto/convertnode.hpp"
30 #include "opto/matcher.hpp"
31 #include "opto/movenode.hpp"
32 #include "opto/phaseX.hpp"
33 #include "opto/subnode.hpp"
34 #include "runtime/stubRoutines.hpp"
35 #include "utilities/checkedCast.hpp"
36
37 //=============================================================================
38 //------------------------------Identity---------------------------------------
39 Node* Conv2BNode::Identity(PhaseGVN* phase) {
40 const Type *t = phase->type( in(1) );
41 if( t == Type::TOP ) return in(1);
42 if( t == TypeInt::ZERO ) return in(1);
43 if( t == TypeInt::ONE ) return in(1);
44 if( t == TypeInt::BOOL ) return in(1);
45 return this;
46 }
47
48 //------------------------------Value------------------------------------------
49 const Type* Conv2BNode::Value(PhaseGVN* phase) const {
50 const Type *t = phase->type( in(1) );
51 if( t == Type::TOP ) return Type::TOP;
52 if( t == TypeInt::ZERO ) return TypeInt::ZERO;
53 if( t == TypePtr::NULL_PTR ) return TypeInt::ZERO;
54 const TypePtr *tp = t->isa_ptr();
55 if(tp != nullptr) {
56 if( tp->ptr() == TypePtr::AnyNull ) return Type::TOP;
57 if( tp->ptr() == TypePtr::Constant) return TypeInt::ONE;
58 if (tp->ptr() == TypePtr::NotNull) return TypeInt::ONE;
59 return TypeInt::BOOL;
60 }
61 if (t->base() != Type::Int) return TypeInt::BOOL;
62 const TypeInt *ti = t->is_int();
63 if( ti->_hi < 0 || ti->_lo > 0 ) return TypeInt::ONE;
64 return TypeInt::BOOL;
65 }
66
67 Node* Conv2BNode::Ideal(PhaseGVN* phase, bool can_reshape) {
68 if (!Matcher::match_rule_supported(Op_Conv2B)) {
69 if (phase->C->post_loop_opts_phase()) {
70 // Get type of comparison to make
71 const Type* t = phase->type(in(1));
72 Node* cmp = nullptr;
73 if (t->isa_int()) {
74 cmp = phase->transform(new CmpINode(in(1), phase->intcon(0)));
75 } else if (t->isa_ptr()) {
76 cmp = phase->transform(new CmpPNode(in(1), phase->zerocon(BasicType::T_OBJECT)));
77 } else {
78 assert(false, "Unrecognized comparison for Conv2B: %s", NodeClassNames[in(1)->Opcode()]);
79 }
80
81 // Replace Conv2B with the cmove
82 Node* bol = phase->transform(new BoolNode(cmp, BoolTest::eq));
83 return new CMoveINode(bol, phase->intcon(1), phase->intcon(0), TypeInt::BOOL);
84 } else {
85 phase->C->record_for_post_loop_opts_igvn(this);
86 }
87 }
88 return nullptr;
89 }
90
91 uint ConvertNode::ideal_reg() const {
92 return _type->ideal_reg();
93 }
94
95 Node* ConvertNode::create_convert(BasicType source, BasicType target, Node* input) {
96 if (source == T_INT) {
97 if (target == T_LONG) {
98 return new ConvI2LNode(input);
99 } else if (target == T_FLOAT) {
100 return new ConvI2FNode(input);
101 } else if (target == T_DOUBLE) {
102 return new ConvI2DNode(input);
103 }
104 } else if (source == T_LONG) {
105 if (target == T_INT) {
106 return new ConvL2INode(input);
107 } else if (target == T_FLOAT) {
108 return new ConvL2FNode(input);
109 } else if (target == T_DOUBLE) {
110 return new ConvL2DNode(input);
111 }
112 } else if (source == T_FLOAT) {
113 if (target == T_INT) {
114 return new ConvF2INode(input);
115 } else if (target == T_LONG) {
116 return new ConvF2LNode(input);
117 } else if (target == T_DOUBLE) {
118 return new ConvF2DNode(input);
119 } else if (target == T_SHORT) {
120 return new ConvF2HFNode(input);
121 }
122 } else if (source == T_DOUBLE) {
123 if (target == T_INT) {
124 return new ConvD2INode(input);
125 } else if (target == T_LONG) {
126 return new ConvD2LNode(input);
127 } else if (target == T_FLOAT) {
128 return new ConvD2FNode(input);
129 }
130 } else if (source == T_SHORT) {
131 if (target == T_FLOAT) {
132 return new ConvHF2FNode(input);
133 }
134 }
135
136 assert(false, "Couldn't create conversion for type %s to %s", type2name(source), type2name(target));
137 return nullptr;
138 }
139
140 // The conversions operations are all Alpha sorted. Please keep it that way!
141 //=============================================================================
142 //------------------------------Value------------------------------------------
143 const Type* ConvD2FNode::Value(PhaseGVN* phase) const {
144 const Type *t = phase->type( in(1) );
145 if( t == Type::TOP ) return Type::TOP;
146 if( t == Type::DOUBLE ) return Type::FLOAT;
147 const TypeD *td = t->is_double_constant();
148 return TypeF::make( (float)td->getd() );
149 }
150
151 //------------------------------Ideal------------------------------------------
152 // If we see pattern ConvF2D SomeDoubleOp ConvD2F, do operation as float.
153 Node *ConvD2FNode::Ideal(PhaseGVN *phase, bool can_reshape) {
154 if ( in(1)->Opcode() == Op_SqrtD ) {
155 Node* sqrtd = in(1);
156 if ( sqrtd->in(1)->Opcode() == Op_ConvF2D ) {
157 if ( Matcher::match_rule_supported(Op_SqrtF) ) {
158 Node* convf2d = sqrtd->in(1);
159 return new SqrtFNode(phase->C, sqrtd->in(0), convf2d->in(1));
160 }
161 }
162 }
163 return nullptr;
164 }
165
166 //------------------------------Identity---------------------------------------
167 // Float's can be converted to doubles with no loss of bits. Hence
168 // converting a float to a double and back to a float is a NOP.
169 Node* ConvD2FNode::Identity(PhaseGVN* phase) {
170 return (in(1)->Opcode() == Op_ConvF2D) ? in(1)->in(1) : this;
171 }
172
173 //=============================================================================
174 //------------------------------Value------------------------------------------
175 const Type* ConvD2INode::Value(PhaseGVN* phase) const {
176 const Type *t = phase->type( in(1) );
177 if( t == Type::TOP ) return Type::TOP;
178 if( t == Type::DOUBLE ) return TypeInt::INT;
179 const TypeD *td = t->is_double_constant();
180 return TypeInt::make( SharedRuntime::d2i( td->getd() ) );
181 }
182
183 //------------------------------Ideal------------------------------------------
184 // If converting to an int type, skip any rounding nodes
185 Node *ConvD2INode::Ideal(PhaseGVN *phase, bool can_reshape) {
186 if (in(1)->Opcode() == Op_RoundDouble) {
187 set_req(1, in(1)->in(1));
188 return this;
189 }
190 return nullptr;
191 }
192
193 //------------------------------Identity---------------------------------------
194 // Int's can be converted to doubles with no loss of bits. Hence
195 // converting an integer to a double and back to an integer is a NOP.
196 Node* ConvD2INode::Identity(PhaseGVN* phase) {
197 return (in(1)->Opcode() == Op_ConvI2D) ? in(1)->in(1) : this;
198 }
199
200 //=============================================================================
201 //------------------------------Value------------------------------------------
202 const Type* ConvD2LNode::Value(PhaseGVN* phase) const {
203 const Type *t = phase->type( in(1) );
204 if( t == Type::TOP ) return Type::TOP;
205 if( t == Type::DOUBLE ) return TypeLong::LONG;
206 const TypeD *td = t->is_double_constant();
207 return TypeLong::make( SharedRuntime::d2l( td->getd() ) );
208 }
209
210 //------------------------------Identity---------------------------------------
211 Node* ConvD2LNode::Identity(PhaseGVN* phase) {
212 // Remove ConvD2L->ConvL2D->ConvD2L sequences.
213 if( in(1) ->Opcode() == Op_ConvL2D &&
214 in(1)->in(1)->Opcode() == Op_ConvD2L )
215 return in(1)->in(1);
216 return this;
217 }
218
219 //------------------------------Ideal------------------------------------------
220 // If converting to an int type, skip any rounding nodes
221 Node *ConvD2LNode::Ideal(PhaseGVN *phase, bool can_reshape) {
222 if (in(1)->Opcode() == Op_RoundDouble) {
223 set_req(1, in(1)->in(1));
224 return this;
225 }
226 return nullptr;
227 }
228
229 //=============================================================================
230 //------------------------------Value------------------------------------------
231 const Type* ConvF2DNode::Value(PhaseGVN* phase) const {
232 const Type *t = phase->type( in(1) );
233 if( t == Type::TOP ) return Type::TOP;
234 if( t == Type::FLOAT ) return Type::DOUBLE;
235 const TypeF *tf = t->is_float_constant();
236 return TypeD::make( (double)tf->getf() );
237 }
238
239 //=============================================================================
240 //------------------------------Value------------------------------------------
241 const Type* ConvF2HFNode::Value(PhaseGVN* phase) const {
242 const Type *t = phase->type( in(1) );
243 if (t == Type::TOP) return Type::TOP;
244 if (t == Type::FLOAT || StubRoutines::f2hf_adr() == nullptr) {
245 return TypeInt::SHORT;
246 }
247
248 const TypeF *tf = t->is_float_constant();
249 return TypeInt::make( StubRoutines::f2hf(tf->getf()) );
250 }
251
252 //=============================================================================
253 //------------------------------Value------------------------------------------
254 const Type* ConvF2INode::Value(PhaseGVN* phase) const {
255 const Type *t = phase->type( in(1) );
256 if( t == Type::TOP ) return Type::TOP;
257 if( t == Type::FLOAT ) return TypeInt::INT;
258 const TypeF *tf = t->is_float_constant();
259 return TypeInt::make( SharedRuntime::f2i( tf->getf() ) );
260 }
261
262 //------------------------------Identity---------------------------------------
263 Node* ConvF2INode::Identity(PhaseGVN* phase) {
264 // Remove ConvF2I->ConvI2F->ConvF2I sequences.
265 if( in(1) ->Opcode() == Op_ConvI2F &&
266 in(1)->in(1)->Opcode() == Op_ConvF2I )
267 return in(1)->in(1);
268 return this;
269 }
270
271 //------------------------------Ideal------------------------------------------
272 // If converting to an int type, skip any rounding nodes
273 Node *ConvF2INode::Ideal(PhaseGVN *phase, bool can_reshape) {
274 if (in(1)->Opcode() == Op_RoundFloat) {
275 set_req(1, in(1)->in(1));
276 return this;
277 }
278 return nullptr;
279 }
280
281 //=============================================================================
282 //------------------------------Value------------------------------------------
283 const Type* ConvF2LNode::Value(PhaseGVN* phase) const {
284 const Type *t = phase->type( in(1) );
285 if( t == Type::TOP ) return Type::TOP;
286 if( t == Type::FLOAT ) return TypeLong::LONG;
287 const TypeF *tf = t->is_float_constant();
288 return TypeLong::make( SharedRuntime::f2l( tf->getf() ) );
289 }
290
291 //------------------------------Identity---------------------------------------
292 Node* ConvF2LNode::Identity(PhaseGVN* phase) {
293 // Remove ConvF2L->ConvL2F->ConvF2L sequences.
294 if( in(1) ->Opcode() == Op_ConvL2F &&
295 in(1)->in(1)->Opcode() == Op_ConvF2L )
296 return in(1)->in(1);
297 return this;
298 }
299
300 //------------------------------Ideal------------------------------------------
301 // If converting to an int type, skip any rounding nodes
302 Node *ConvF2LNode::Ideal(PhaseGVN *phase, bool can_reshape) {
303 if (in(1)->Opcode() == Op_RoundFloat) {
304 set_req(1, in(1)->in(1));
305 return this;
306 }
307 return nullptr;
308 }
309
310 //=============================================================================
311 //------------------------------Value------------------------------------------
312 const Type* ConvHF2FNode::Value(PhaseGVN* phase) const {
313 const Type *t = phase->type( in(1) );
314 if (t == Type::TOP) return Type::TOP;
315 if (t == TypeInt::SHORT || StubRoutines::hf2f_adr() == nullptr) {
316 return Type::FLOAT;
317 }
318
319 const TypeInt *ti = t->is_int();
320 if (ti->is_con()) {
321 return TypeF::make( StubRoutines::hf2f(ti->get_con()) );
322 }
323 return Type::FLOAT;
324 }
325
326 //=============================================================================
327 //------------------------------Value------------------------------------------
328 const Type* ConvI2DNode::Value(PhaseGVN* phase) const {
329 const Type *t = phase->type( in(1) );
330 if( t == Type::TOP ) return Type::TOP;
331 const TypeInt *ti = t->is_int();
332 if( ti->is_con() ) return TypeD::make( (double)ti->get_con() );
333 return Type::DOUBLE;
334 }
335
336 //=============================================================================
337 //------------------------------Value------------------------------------------
338 const Type* ConvI2FNode::Value(PhaseGVN* phase) const {
339 const Type *t = phase->type( in(1) );
340 if( t == Type::TOP ) return Type::TOP;
341 const TypeInt *ti = t->is_int();
342 if( ti->is_con() ) return TypeF::make( (float)ti->get_con() );
343 return Type::FLOAT;
344 }
345
346 //------------------------------Identity---------------------------------------
347 Node* ConvI2FNode::Identity(PhaseGVN* phase) {
348 // Remove ConvI2F->ConvF2I->ConvI2F sequences.
349 if( in(1) ->Opcode() == Op_ConvF2I &&
350 in(1)->in(1)->Opcode() == Op_ConvI2F )
351 return in(1)->in(1);
352 return this;
353 }
354
355 //=============================================================================
356 //------------------------------Value------------------------------------------
357 const Type* ConvI2LNode::Value(PhaseGVN* phase) const {
358 const Type *t = phase->type( in(1) );
359 if (t == Type::TOP) {
360 return Type::TOP;
361 }
362 const TypeInt *ti = t->is_int();
363 const Type* tl = TypeLong::make(ti->_lo, ti->_hi, ti->_widen);
364 // Join my declared type against my incoming type.
365 tl = tl->filter(_type);
366 if (!tl->isa_long()) {
367 return tl;
368 }
369 const TypeLong* this_type = tl->is_long();
370 // Do NOT remove this node's type assertion until no more loop ops can happen.
371 if (phase->C->post_loop_opts_phase()) {
372 const TypeInt* in_type = phase->type(in(1))->isa_int();
373 if (in_type != nullptr &&
374 (in_type->_lo != this_type->_lo ||
375 in_type->_hi != this_type->_hi)) {
376 // Although this WORSENS the type, it increases GVN opportunities,
377 // because I2L nodes with the same input will common up, regardless
378 // of slightly differing type assertions. Such slight differences
379 // arise routinely as a result of loop unrolling, so this is a
380 // post-unrolling graph cleanup. Choose a type which depends only
381 // on my input. (Exception: Keep a range assertion of >=0 or <0.)
382 jlong lo1 = this_type->_lo;
383 jlong hi1 = this_type->_hi;
384 int w1 = this_type->_widen;
385 if (lo1 >= 0) {
386 // Keep a range assertion of >=0.
387 lo1 = 0; hi1 = max_jint;
388 } else if (hi1 < 0) {
389 // Keep a range assertion of <0.
390 lo1 = min_jint; hi1 = -1;
391 } else {
392 lo1 = min_jint; hi1 = max_jint;
393 }
394 return TypeLong::make(MAX2((jlong)in_type->_lo, lo1),
395 MIN2((jlong)in_type->_hi, hi1),
396 MAX2((int)in_type->_widen, w1));
397 }
398 }
399 return this_type;
400 }
401
402 Node* ConvI2LNode::Identity(PhaseGVN* phase) {
403 // If type is in "int" sub-range, we can
404 // convert I2L(L2I(x)) => x
405 // since the conversions have no effect.
406 if (in(1)->Opcode() == Op_ConvL2I) {
407 Node* x = in(1)->in(1);
408 const TypeLong* t = phase->type(x)->isa_long();
409 if (t != nullptr && t->_lo >= min_jint && t->_hi <= max_jint) {
410 return x;
411 }
412 }
413 return this;
414 }
415
416 #ifdef ASSERT
417 static inline bool long_ranges_overlap(jlong lo1, jlong hi1,
418 jlong lo2, jlong hi2) {
419 // Two ranges overlap iff one range's low point falls in the other range.
420 return (lo2 <= lo1 && lo1 <= hi2) || (lo1 <= lo2 && lo2 <= hi1);
421 }
422 #endif
423
424 template<class T> static bool subtract_overflows(T x, T y) {
425 T s = java_subtract(x, y);
426 return (x >= 0) && (y < 0) && (s < 0);
427 }
428
429 template<class T> static bool subtract_underflows(T x, T y) {
430 T s = java_subtract(x, y);
431 return (x < 0) && (y > 0) && (s > 0);
432 }
433
434 template<class T> static bool add_overflows(T x, T y) {
435 T s = java_add(x, y);
436 return (x > 0) && (y > 0) && (s < 0);
437 }
438
439 template<class T> static bool add_underflows(T x, T y) {
440 T s = java_add(x, y);
441 return (x < 0) && (y < 0) && (s >= 0);
442 }
443
444 template<class T> static bool ranges_overlap(T xlo, T ylo, T xhi, T yhi, T zlo, T zhi,
445 const Node* n, bool pos) {
446 assert(xlo <= xhi && ylo <= yhi && zlo <= zhi, "should not be empty types");
447 T x_y_lo;
448 T x_y_hi;
449 bool x_y_lo_overflow;
450 bool x_y_hi_overflow;
451
452 if (n->is_Sub()) {
453 x_y_lo = java_subtract(xlo, yhi);
454 x_y_hi = java_subtract(xhi, ylo);
455 x_y_lo_overflow = pos ? subtract_overflows(xlo, yhi) : subtract_underflows(xlo, yhi);
456 x_y_hi_overflow = pos ? subtract_overflows(xhi, ylo) : subtract_underflows(xhi, ylo);
457 } else {
458 assert(n->is_Add(), "Add or Sub only");
459 x_y_lo = java_add(xlo, ylo);
460 x_y_hi = java_add(xhi, yhi);
461 x_y_lo_overflow = pos ? add_overflows(xlo, ylo) : add_underflows(xlo, ylo);
462 x_y_hi_overflow = pos ? add_overflows(xhi, yhi) : add_underflows(xhi, yhi);
463 }
464 assert(!pos || !x_y_lo_overflow || x_y_hi_overflow, "x_y_lo_overflow => x_y_hi_overflow");
465 assert(pos || !x_y_hi_overflow || x_y_lo_overflow, "x_y_hi_overflow => x_y_lo_overflow");
466
467 // Two ranges overlap iff one range's low point falls in the other range.
468 // nbits = 32 or 64
469 if (pos) {
470 // (zlo + 2**nbits <= x_y_lo && x_y_lo <= zhi ** nbits)
471 if (x_y_lo_overflow) {
472 if (zlo <= x_y_lo && x_y_lo <= zhi) {
473 return true;
474 }
475 }
476
477 // (x_y_lo <= zlo + 2**nbits && zlo + 2**nbits <= x_y_hi)
478 if (x_y_hi_overflow) {
479 if ((!x_y_lo_overflow || x_y_lo <= zlo) && zlo <= x_y_hi) {
480 return true;
481 }
482 }
483 } else {
484 // (zlo - 2**nbits <= x_y_hi && x_y_hi <= zhi - 2**nbits)
485 if (x_y_hi_overflow) {
486 if (zlo <= x_y_hi && x_y_hi <= zhi) {
487 return true;
488 }
489 }
490
491 // (x_y_lo <= zhi - 2**nbits && zhi - 2**nbits <= x_y_hi)
492 if (x_y_lo_overflow) {
493 if (x_y_lo <= zhi && (!x_y_hi_overflow || zhi <= x_y_hi)) {
494 return true;
495 }
496 }
497 }
498
499 return false;
500 }
501
502 static bool ranges_overlap(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
503 const Node* n, bool pos, BasicType bt) {
504 jlong xlo = tx->lo_as_long();
505 jlong xhi = tx->hi_as_long();
506 jlong ylo = ty->lo_as_long();
507 jlong yhi = ty->hi_as_long();
508 jlong zlo = tz->lo_as_long();
509 jlong zhi = tz->hi_as_long();
510
511 if (bt == T_INT) {
512 // See if x+y can cause positive overflow into z+2**32
513 // See if x+y can cause negative overflow into z-2**32
514 bool res = ranges_overlap(checked_cast<jint>(xlo), checked_cast<jint>(ylo),
515 checked_cast<jint>(xhi), checked_cast<jint>(yhi),
516 checked_cast<jint>(zlo), checked_cast<jint>(zhi), n, pos);
517 #ifdef ASSERT
518 jlong vbit = CONST64(1) << BitsPerInt;
519 if (n->Opcode() == Op_SubI) {
520 jlong ylo0 = ylo;
521 ylo = -yhi;
522 yhi = -ylo0;
523 }
524 assert(res == long_ranges_overlap(xlo+ylo, xhi+yhi, pos ? zlo+vbit : zlo-vbit, pos ? zhi+vbit : zhi-vbit), "inconsistent result");
525 #endif
526 return res;
527 }
528 assert(bt == T_LONG, "only int or long");
529 // See if x+y can cause positive overflow into z+2**64
530 // See if x+y can cause negative overflow into z-2**64
531 return ranges_overlap(xlo, ylo, xhi, yhi, zlo, zhi, n, pos);
532 }
533
534 #ifdef ASSERT
535 static bool compute_updates_ranges_verif(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
536 jlong& rxlo, jlong& rxhi, jlong& rylo, jlong& ryhi,
537 const Node* n) {
538 jlong xlo = tx->lo_as_long();
539 jlong xhi = tx->hi_as_long();
540 jlong ylo = ty->lo_as_long();
541 jlong yhi = ty->hi_as_long();
542 jlong zlo = tz->lo_as_long();
543 jlong zhi = tz->hi_as_long();
544 if (n->is_Sub()) {
545 swap(ylo, yhi);
546 ylo = -ylo;
547 yhi = -yhi;
548 }
549
550 rxlo = MAX2(xlo, zlo - yhi);
551 rxhi = MIN2(xhi, zhi - ylo);
552 rylo = MAX2(ylo, zlo - xhi);
553 ryhi = MIN2(yhi, zhi - xlo);
554 if (rxlo > rxhi || rylo > ryhi) {
555 return false;
556 }
557 if (n->is_Sub()) {
558 swap(rylo, ryhi);
559 rylo = -rylo;
560 ryhi = -ryhi;
561 }
562 assert(rxlo == (int) rxlo && rxhi == (int) rxhi, "x should not overflow");
563 assert(rylo == (int) rylo && ryhi == (int) ryhi, "y should not overflow");
564 return true;
565 }
566 #endif
567
568 template<class T> static bool compute_updates_ranges(T xlo, T ylo, T xhi, T yhi, T zlo, T zhi,
569 jlong& rxlo, jlong& rxhi, jlong& rylo, jlong& ryhi,
570 const Node* n) {
571 assert(xlo <= xhi && ylo <= yhi && zlo <= zhi, "should not be empty types");
572
573 // Now it's always safe to assume x+y does not overflow.
574 // This is true even if some pairs x,y might cause overflow, as long
575 // as that overflow value cannot fall into [zlo,zhi].
576
577 // Confident that the arithmetic is "as if infinite precision",
578 // we can now use n's range to put constraints on those of x and y.
579 // The "natural" range of x [xlo,xhi] can perhaps be narrowed to a
580 // more "restricted" range by intersecting [xlo,xhi] with the
581 // range obtained by subtracting y's range from the asserted range
582 // of the I2L conversion. Here's the interval arithmetic algebra:
583 // x == n-y == [zlo,zhi]-[ylo,yhi] == [zlo,zhi]+[-yhi,-ylo]
584 // => x in [zlo-yhi, zhi-ylo]
585 // => x in [zlo-yhi, zhi-ylo] INTERSECT [xlo,xhi]
586 // => x in [xlo MAX zlo-yhi, xhi MIN zhi-ylo]
587 // And similarly, x changing place with y.
588 if (n->is_Sub()) {
589 if (add_overflows(zlo, ylo) || add_underflows(zhi, yhi) || subtract_underflows(xhi, zlo) ||
590 subtract_overflows(xlo, zhi)) {
591 return false;
592 }
593 rxlo = add_underflows(zlo, ylo) ? xlo : MAX2(xlo, java_add(zlo, ylo));
594 rxhi = add_overflows(zhi, yhi) ? xhi : MIN2(xhi, java_add(zhi, yhi));
595 ryhi = subtract_overflows(xhi, zlo) ? yhi : MIN2(yhi, java_subtract(xhi, zlo));
596 rylo = subtract_underflows(xlo, zhi) ? ylo : MAX2(ylo, java_subtract(xlo, zhi));
597 } else {
598 assert(n->is_Add(), "Add or Sub only");
599 if (subtract_overflows(zlo, yhi) || subtract_underflows(zhi, ylo) ||
600 subtract_overflows(zlo, xhi) || subtract_underflows(zhi, xlo)) {
601 return false;
602 }
603 rxlo = subtract_underflows(zlo, yhi) ? xlo : MAX2(xlo, java_subtract(zlo, yhi));
604 rxhi = subtract_overflows(zhi, ylo) ? xhi : MIN2(xhi, java_subtract(zhi, ylo));
605 rylo = subtract_underflows(zlo, xhi) ? ylo : MAX2(ylo, java_subtract(zlo, xhi));
606 ryhi = subtract_overflows(zhi, xlo) ? yhi : MIN2(yhi, java_subtract(zhi, xlo));
607 }
608
609 if (rxlo > rxhi || rylo > ryhi) {
610 return false; // x or y is dying; don't mess w/ it
611 }
612
613 return true;
614 }
615
616 static bool compute_updates_ranges(const TypeInteger* tx, const TypeInteger* ty, const TypeInteger* tz,
617 const TypeInteger*& rx, const TypeInteger*& ry,
618 const Node* n, const BasicType in_bt, BasicType out_bt) {
619
620 jlong xlo = tx->lo_as_long();
621 jlong xhi = tx->hi_as_long();
622 jlong ylo = ty->lo_as_long();
623 jlong yhi = ty->hi_as_long();
624 jlong zlo = tz->lo_as_long();
625 jlong zhi = tz->hi_as_long();
626 jlong rxlo, rxhi, rylo, ryhi;
627
628 if (in_bt == T_INT) {
629 #ifdef ASSERT
630 jlong expected_rxlo, expected_rxhi, expected_rylo, expected_ryhi;
631 bool expected = compute_updates_ranges_verif(tx, ty, tz,
632 expected_rxlo, expected_rxhi,
633 expected_rylo, expected_ryhi, n);
634 #endif
635 if (!compute_updates_ranges(checked_cast<jint>(xlo), checked_cast<jint>(ylo),
636 checked_cast<jint>(xhi), checked_cast<jint>(yhi),
637 checked_cast<jint>(zlo), checked_cast<jint>(zhi),
638 rxlo, rxhi, rylo, ryhi, n)) {
639 assert(!expected, "inconsistent");
640 return false;
641 }
642 assert(expected && rxlo == expected_rxlo && rxhi == expected_rxhi && rylo == expected_rylo && ryhi == expected_ryhi, "inconsistent");
643 } else {
644 if (!compute_updates_ranges(xlo, ylo, xhi, yhi, zlo, zhi,
645 rxlo, rxhi, rylo, ryhi, n)) {
646 return false;
647 }
648 }
649
650 int widen = MAX2(tx->widen_limit(), ty->widen_limit());
651 rx = TypeInteger::make(rxlo, rxhi, widen, out_bt);
652 ry = TypeInteger::make(rylo, ryhi, widen, out_bt);
653 return true;
654 }
655
656 #ifdef _LP64
657 // If there is an existing ConvI2L node with the given parent and type, return
658 // it. Otherwise, create and return a new one. Both reusing existing ConvI2L
659 // nodes and postponing the idealization of new ones are needed to avoid an
660 // explosion of recursive Ideal() calls when compiling long AddI chains.
661 static Node* find_or_make_convI2L(PhaseIterGVN* igvn, Node* parent,
662 const TypeLong* type) {
663 Node* n = new ConvI2LNode(parent, type);
664 Node* existing = igvn->hash_find_insert(n);
665 if (existing != nullptr) {
666 n->destruct(igvn);
667 return existing;
668 }
669 return igvn->register_new_node_with_optimizer(n);
670 }
671 #endif
672
673 bool Compile::push_thru_add(PhaseGVN* phase, Node* z, const TypeInteger* tz, const TypeInteger*& rx, const TypeInteger*& ry,
674 BasicType in_bt, BasicType out_bt) {
675 int op = z->Opcode();
676 if (op == Op_Add(in_bt) || op == Op_Sub(in_bt)) {
677 Node* x = z->in(1);
678 Node* y = z->in(2);
679 assert (x != z && y != z, "dead loop in ConvI2LNode::Ideal");
680 if (phase->type(x) == Type::TOP) {
681 return false;
682 }
683 if (phase->type(y) == Type::TOP) {
684 return false;
685 }
686 const TypeInteger* tx = phase->type(x)->is_integer(in_bt);
687 const TypeInteger* ty = phase->type(y)->is_integer(in_bt);
688
689 if (ranges_overlap(tx, ty, tz, z, true, in_bt) ||
690 ranges_overlap(tx, ty, tz, z, false, in_bt)) {
691 return false;
692 }
693 return compute_updates_ranges(tx, ty, tz, rx, ry, z, in_bt, out_bt);
694 }
695 return false;
696 }
697
698
699 //------------------------------Ideal------------------------------------------
700 Node *ConvI2LNode::Ideal(PhaseGVN *phase, bool can_reshape) {
701 const TypeLong* this_type = this->type()->is_long();
702 if (can_reshape && !phase->C->post_loop_opts_phase()) {
703 // makes sure we run ::Value to potentially remove type assertion after loop opts
704 phase->C->record_for_post_loop_opts_igvn(this);
705 }
706 #ifdef _LP64
707 // Convert ConvI2L(AddI(x, y)) to AddL(ConvI2L(x), ConvI2L(y))
708 // but only if x and y have subranges that cannot cause 32-bit overflow,
709 // under the assumption that x+y is in my own subrange this->type().
710
711 // This assumption is based on a constraint (i.e., type assertion)
712 // established in Parse::array_addressing or perhaps elsewhere.
713 // This constraint has been adjoined to the "natural" type of
714 // the incoming argument in(0). We know (because of runtime
715 // checks) - that the result value I2L(x+y) is in the joined range.
716 // Hence we can restrict the incoming terms (x, y) to values such
717 // that their sum also lands in that range.
718
719 // This optimization is useful only on 64-bit systems, where we hope
720 // the addition will end up subsumed in an addressing mode.
721 // It is necessary to do this when optimizing an unrolled array
722 // copy loop such as x[i++] = y[i++].
723
724 // On 32-bit systems, it's better to perform as much 32-bit math as
725 // possible before the I2L conversion, because 32-bit math is cheaper.
726 // There's no common reason to "leak" a constant offset through the I2L.
727 // Addressing arithmetic will not absorb it as part of a 64-bit AddL.
728 PhaseIterGVN* igvn = phase->is_IterGVN();
729 Node* z = in(1);
730 const TypeInteger* rx = nullptr;
731 const TypeInteger* ry = nullptr;
732 if (Compile::push_thru_add(phase, z, this_type, rx, ry, T_INT, T_LONG)) {
733 if (igvn == nullptr) {
734 // Postpone this optimization to iterative GVN, where we can handle deep
735 // AddI chains without an exponential number of recursive Ideal() calls.
736 phase->record_for_igvn(this);
737 return nullptr;
738 }
739 int op = z->Opcode();
740 Node* x = z->in(1);
741 Node* y = z->in(2);
742
743 Node* cx = find_or_make_convI2L(igvn, x, rx->is_long());
744 Node* cy = find_or_make_convI2L(igvn, y, ry->is_long());
745 switch (op) {
746 case Op_AddI: return new AddLNode(cx, cy);
747 case Op_SubI: return new SubLNode(cx, cy);
748 default: ShouldNotReachHere();
749 }
750 }
751 #endif //_LP64
752
753 return nullptr;
754 }
755
756 //=============================================================================
757 //------------------------------Value------------------------------------------
758 const Type* ConvL2DNode::Value(PhaseGVN* phase) const {
759 const Type *t = phase->type( in(1) );
760 if( t == Type::TOP ) return Type::TOP;
761 const TypeLong *tl = t->is_long();
762 if( tl->is_con() ) return TypeD::make( (double)tl->get_con() );
763 return Type::DOUBLE;
764 }
765
766 //=============================================================================
767 //------------------------------Value------------------------------------------
768 const Type* ConvL2FNode::Value(PhaseGVN* phase) const {
769 const Type *t = phase->type( in(1) );
770 if( t == Type::TOP ) return Type::TOP;
771 const TypeLong *tl = t->is_long();
772 if( tl->is_con() ) return TypeF::make( (float)tl->get_con() );
773 return Type::FLOAT;
774 }
775
776 //=============================================================================
777 //----------------------------Identity-----------------------------------------
778 Node* ConvL2INode::Identity(PhaseGVN* phase) {
779 // Convert L2I(I2L(x)) => x
780 if (in(1)->Opcode() == Op_ConvI2L) return in(1)->in(1);
781 return this;
782 }
783
784 //------------------------------Value------------------------------------------
785 const Type* ConvL2INode::Value(PhaseGVN* phase) const {
786 const Type *t = phase->type( in(1) );
787 if( t == Type::TOP ) return Type::TOP;
788 const TypeLong *tl = t->is_long();
789 const TypeInt* ti = TypeInt::INT;
790 if (tl->is_con()) {
791 // Easy case.
792 ti = TypeInt::make((jint)tl->get_con());
793 } else if (tl->_lo >= min_jint && tl->_hi <= max_jint) {
794 ti = TypeInt::make((jint)tl->_lo, (jint)tl->_hi, tl->_widen);
795 }
796 return ti->filter(_type);
797 }
798
799 //------------------------------Ideal------------------------------------------
800 // Return a node which is more "ideal" than the current node.
801 // Blow off prior masking to int
802 Node *ConvL2INode::Ideal(PhaseGVN *phase, bool can_reshape) {
803 Node *andl = in(1);
804 uint andl_op = andl->Opcode();
805 if( andl_op == Op_AndL ) {
806 // Blow off prior masking to int
807 if( phase->type(andl->in(2)) == TypeLong::make( 0xFFFFFFFF ) ) {
808 set_req_X(1,andl->in(1), phase);
809 return this;
810 }
811 }
812
813 // Swap with a prior add: convL2I(addL(x,y)) ==> addI(convL2I(x),convL2I(y))
814 // This replaces an 'AddL' with an 'AddI'.
815 if( andl_op == Op_AddL ) {
816 // Don't do this for nodes which have more than one user since
817 // we'll end up computing the long add anyway.
818 if (andl->outcnt() > 1) return nullptr;
819
820 Node* x = andl->in(1);
821 Node* y = andl->in(2);
822 assert( x != andl && y != andl, "dead loop in ConvL2INode::Ideal" );
823 if (phase->type(x) == Type::TOP) return nullptr;
824 if (phase->type(y) == Type::TOP) return nullptr;
825 Node *add1 = phase->transform(new ConvL2INode(x));
826 Node *add2 = phase->transform(new ConvL2INode(y));
827 return new AddINode(add1,add2);
828 }
829
830 // Disable optimization: LoadL->ConvL2I ==> LoadI.
831 // It causes problems (sizes of Load and Store nodes do not match)
832 // in objects initialization code and Escape Analysis.
833 return nullptr;
834 }
835
836
837
838 //=============================================================================
839 //------------------------------Identity---------------------------------------
840 // Remove redundant roundings
841 Node* RoundFloatNode::Identity(PhaseGVN* phase) {
842 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel");
843 // Do not round constants
844 if (phase->type(in(1))->base() == Type::FloatCon) return in(1);
845 int op = in(1)->Opcode();
846 // Redundant rounding
847 if( op == Op_RoundFloat ) return in(1);
848 // Already rounded
849 if( op == Op_Parm ) return in(1);
850 if( op == Op_LoadF ) return in(1);
851 return this;
852 }
853
854 //------------------------------Value------------------------------------------
855 const Type* RoundFloatNode::Value(PhaseGVN* phase) const {
856 return phase->type( in(1) );
857 }
858
859 //=============================================================================
860 //------------------------------Identity---------------------------------------
861 // Remove redundant roundings. Incoming arguments are already rounded.
862 Node* RoundDoubleNode::Identity(PhaseGVN* phase) {
863 assert(Matcher::strict_fp_requires_explicit_rounding, "should only generate for Intel");
864 // Do not round constants
865 if (phase->type(in(1))->base() == Type::DoubleCon) return in(1);
866 int op = in(1)->Opcode();
867 // Redundant rounding
868 if( op == Op_RoundDouble ) return in(1);
869 // Already rounded
870 if( op == Op_Parm ) return in(1);
871 if( op == Op_LoadD ) return in(1);
872 if( op == Op_ConvF2D ) return in(1);
873 if( op == Op_ConvI2D ) return in(1);
874 return this;
875 }
876
877 //------------------------------Value------------------------------------------
878 const Type* RoundDoubleNode::Value(PhaseGVN* phase) const {
879 return phase->type( in(1) );
880 }
881
882 //=============================================================================
883 RoundDoubleModeNode* RoundDoubleModeNode::make(PhaseGVN& gvn, Node* arg, RoundDoubleModeNode::RoundingMode rmode) {
884 ConINode* rm = gvn.intcon(rmode);
885 return new RoundDoubleModeNode(arg, (Node *)rm);
886 }
887
888 //------------------------------Identity---------------------------------------
889 // Remove redundant roundings.
890 Node* RoundDoubleModeNode::Identity(PhaseGVN* phase) {
891 int op = in(1)->Opcode();
892 // Redundant rounding e.g. floor(ceil(n)) -> ceil(n)
893 if(op == Op_RoundDoubleMode) return in(1);
894 return this;
895 }
896 const Type* RoundDoubleModeNode::Value(PhaseGVN* phase) const {
897 return Type::DOUBLE;
898 }
899 //=============================================================================