Wed, 11 Jul 2012 14:50:30 -0700
7181658: CTW: assert(t->meet(t0) == t) failed: Not monotonic
Summary: Use uncast node equivalence checks in CmpUNode::sub.
Reviewed-by: kvn, twisti
Contributed-by: vladimir.x.ivanov@oracle.com
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25 #include "precompiled.hpp"
26 #include "compiler/compileLog.hpp"
27 #include "memory/allocation.inline.hpp"
28 #include "opto/addnode.hpp"
29 #include "opto/callnode.hpp"
30 #include "opto/cfgnode.hpp"
31 #include "opto/connode.hpp"
32 #include "opto/loopnode.hpp"
33 #include "opto/matcher.hpp"
34 #include "opto/mulnode.hpp"
35 #include "opto/opcodes.hpp"
36 #include "opto/phaseX.hpp"
37 #include "opto/subnode.hpp"
38 #include "runtime/sharedRuntime.hpp"
40 // Portions of code courtesy of Clifford Click
42 // Optimization - Graph Style
44 #include "math.h"
46 //=============================================================================
47 //------------------------------Identity---------------------------------------
48 // If right input is a constant 0, return the left input.
49 Node *SubNode::Identity( PhaseTransform *phase ) {
50 assert(in(1) != this, "Must already have called Value");
51 assert(in(2) != this, "Must already have called Value");
53 // Remove double negation
54 const Type *zero = add_id();
55 if( phase->type( in(1) )->higher_equal( zero ) &&
56 in(2)->Opcode() == Opcode() &&
57 phase->type( in(2)->in(1) )->higher_equal( zero ) ) {
58 return in(2)->in(2);
59 }
61 // Convert "(X+Y) - Y" into X and "(X+Y) - X" into Y
62 if( in(1)->Opcode() == Op_AddI ) {
63 if( phase->eqv(in(1)->in(2),in(2)) )
64 return in(1)->in(1);
65 if (phase->eqv(in(1)->in(1),in(2)))
66 return in(1)->in(2);
68 // Also catch: "(X + Opaque2(Y)) - Y". In this case, 'Y' is a loop-varying
69 // trip counter and X is likely to be loop-invariant (that's how O2 Nodes
70 // are originally used, although the optimizer sometimes jiggers things).
71 // This folding through an O2 removes a loop-exit use of a loop-varying
72 // value and generally lowers register pressure in and around the loop.
73 if( in(1)->in(2)->Opcode() == Op_Opaque2 &&
74 phase->eqv(in(1)->in(2)->in(1),in(2)) )
75 return in(1)->in(1);
76 }
78 return ( phase->type( in(2) )->higher_equal( zero ) ) ? in(1) : this;
79 }
81 //------------------------------Value------------------------------------------
82 // A subtract node differences it's two inputs.
83 const Type *SubNode::Value( PhaseTransform *phase ) const {
84 const Node* in1 = in(1);
85 const Node* in2 = in(2);
86 // Either input is TOP ==> the result is TOP
87 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
88 if( t1 == Type::TOP ) return Type::TOP;
89 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
90 if( t2 == Type::TOP ) return Type::TOP;
92 // Not correct for SubFnode and AddFNode (must check for infinity)
93 // Equal? Subtract is zero
94 if (in1->eqv_uncast(in2)) return add_id();
96 // Either input is BOTTOM ==> the result is the local BOTTOM
97 if( t1 == Type::BOTTOM || t2 == Type::BOTTOM )
98 return bottom_type();
100 return sub(t1,t2); // Local flavor of type subtraction
102 }
104 //=============================================================================
106 //------------------------------Helper function--------------------------------
107 static bool ok_to_convert(Node* inc, Node* iv) {
108 // Do not collapse (x+c0)-y if "+" is a loop increment, because the
109 // "-" is loop invariant and collapsing extends the live-range of "x"
110 // to overlap with the "+", forcing another register to be used in
111 // the loop.
112 // This test will be clearer with '&&' (apply DeMorgan's rule)
113 // but I like the early cutouts that happen here.
114 const PhiNode *phi;
115 if( ( !inc->in(1)->is_Phi() ||
116 !(phi=inc->in(1)->as_Phi()) ||
117 phi->is_copy() ||
118 !phi->region()->is_CountedLoop() ||
119 inc != phi->region()->as_CountedLoop()->incr() )
120 &&
121 // Do not collapse (x+c0)-iv if "iv" is a loop induction variable,
122 // because "x" maybe invariant.
123 ( !iv->is_loop_iv() )
124 ) {
125 return true;
126 } else {
127 return false;
128 }
129 }
130 //------------------------------Ideal------------------------------------------
131 Node *SubINode::Ideal(PhaseGVN *phase, bool can_reshape){
132 Node *in1 = in(1);
133 Node *in2 = in(2);
134 uint op1 = in1->Opcode();
135 uint op2 = in2->Opcode();
137 #ifdef ASSERT
138 // Check for dead loop
139 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) ||
140 ( op1 == Op_AddI || op1 == Op_SubI ) &&
141 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) ||
142 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) )
143 assert(false, "dead loop in SubINode::Ideal");
144 #endif
146 const Type *t2 = phase->type( in2 );
147 if( t2 == Type::TOP ) return NULL;
148 // Convert "x-c0" into "x+ -c0".
149 if( t2->base() == Type::Int ){ // Might be bottom or top...
150 const TypeInt *i = t2->is_int();
151 if( i->is_con() )
152 return new (phase->C, 3) AddINode(in1, phase->intcon(-i->get_con()));
153 }
155 // Convert "(x+c0) - y" into (x-y) + c0"
156 // Do not collapse (x+c0)-y if "+" is a loop increment or
157 // if "y" is a loop induction variable.
158 if( op1 == Op_AddI && ok_to_convert(in1, in2) ) {
159 const Type *tadd = phase->type( in1->in(2) );
160 if( tadd->singleton() && tadd != Type::TOP ) {
161 Node *sub2 = phase->transform( new (phase->C, 3) SubINode( in1->in(1), in2 ));
162 return new (phase->C, 3) AddINode( sub2, in1->in(2) );
163 }
164 }
167 // Convert "x - (y+c0)" into "(x-y) - c0"
168 // Need the same check as in above optimization but reversed.
169 if (op2 == Op_AddI && ok_to_convert(in2, in1)) {
170 Node* in21 = in2->in(1);
171 Node* in22 = in2->in(2);
172 const TypeInt* tcon = phase->type(in22)->isa_int();
173 if (tcon != NULL && tcon->is_con()) {
174 Node* sub2 = phase->transform( new (phase->C, 3) SubINode(in1, in21) );
175 Node* neg_c0 = phase->intcon(- tcon->get_con());
176 return new (phase->C, 3) AddINode(sub2, neg_c0);
177 }
178 }
180 const Type *t1 = phase->type( in1 );
181 if( t1 == Type::TOP ) return NULL;
183 #ifdef ASSERT
184 // Check for dead loop
185 if( ( op2 == Op_AddI || op2 == Op_SubI ) &&
186 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) ||
187 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) )
188 assert(false, "dead loop in SubINode::Ideal");
189 #endif
191 // Convert "x - (x+y)" into "-y"
192 if( op2 == Op_AddI &&
193 phase->eqv( in1, in2->in(1) ) )
194 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(2));
195 // Convert "(x-y) - x" into "-y"
196 if( op1 == Op_SubI &&
197 phase->eqv( in1->in(1), in2 ) )
198 return new (phase->C, 3) SubINode( phase->intcon(0),in1->in(2));
199 // Convert "x - (y+x)" into "-y"
200 if( op2 == Op_AddI &&
201 phase->eqv( in1, in2->in(2) ) )
202 return new (phase->C, 3) SubINode( phase->intcon(0),in2->in(1));
204 // Convert "0 - (x-y)" into "y-x"
205 if( t1 == TypeInt::ZERO && op2 == Op_SubI )
206 return new (phase->C, 3) SubINode( in2->in(2), in2->in(1) );
208 // Convert "0 - (x+con)" into "-con-x"
209 jint con;
210 if( t1 == TypeInt::ZERO && op2 == Op_AddI &&
211 (con = in2->in(2)->find_int_con(0)) != 0 )
212 return new (phase->C, 3) SubINode( phase->intcon(-con), in2->in(1) );
214 // Convert "(X+A) - (X+B)" into "A - B"
215 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(1) )
216 return new (phase->C, 3) SubINode( in1->in(2), in2->in(2) );
218 // Convert "(A+X) - (B+X)" into "A - B"
219 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(2) )
220 return new (phase->C, 3) SubINode( in1->in(1), in2->in(1) );
222 // Convert "(A+X) - (X+B)" into "A - B"
223 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(2) == in2->in(1) )
224 return new (phase->C, 3) SubINode( in1->in(1), in2->in(2) );
226 // Convert "(X+A) - (B+X)" into "A - B"
227 if( op1 == Op_AddI && op2 == Op_AddI && in1->in(1) == in2->in(2) )
228 return new (phase->C, 3) SubINode( in1->in(2), in2->in(1) );
230 // Convert "A-(B-C)" into (A+C)-B", since add is commutative and generally
231 // nicer to optimize than subtract.
232 if( op2 == Op_SubI && in2->outcnt() == 1) {
233 Node *add1 = phase->transform( new (phase->C, 3) AddINode( in1, in2->in(2) ) );
234 return new (phase->C, 3) SubINode( add1, in2->in(1) );
235 }
237 return NULL;
238 }
240 //------------------------------sub--------------------------------------------
241 // A subtract node differences it's two inputs.
242 const Type *SubINode::sub( const Type *t1, const Type *t2 ) const {
243 const TypeInt *r0 = t1->is_int(); // Handy access
244 const TypeInt *r1 = t2->is_int();
245 int32 lo = r0->_lo - r1->_hi;
246 int32 hi = r0->_hi - r1->_lo;
248 // We next check for 32-bit overflow.
249 // If that happens, we just assume all integers are possible.
250 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR
251 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND
252 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR
253 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs
254 return TypeInt::make(lo,hi,MAX2(r0->_widen,r1->_widen));
255 else // Overflow; assume all integers
256 return TypeInt::INT;
257 }
259 //=============================================================================
260 //------------------------------Ideal------------------------------------------
261 Node *SubLNode::Ideal(PhaseGVN *phase, bool can_reshape) {
262 Node *in1 = in(1);
263 Node *in2 = in(2);
264 uint op1 = in1->Opcode();
265 uint op2 = in2->Opcode();
267 #ifdef ASSERT
268 // Check for dead loop
269 if( phase->eqv( in1, this ) || phase->eqv( in2, this ) ||
270 ( op1 == Op_AddL || op1 == Op_SubL ) &&
271 ( phase->eqv( in1->in(1), this ) || phase->eqv( in1->in(2), this ) ||
272 phase->eqv( in1->in(1), in1 ) || phase->eqv( in1->in(2), in1 ) ) )
273 assert(false, "dead loop in SubLNode::Ideal");
274 #endif
276 if( phase->type( in2 ) == Type::TOP ) return NULL;
277 const TypeLong *i = phase->type( in2 )->isa_long();
278 // Convert "x-c0" into "x+ -c0".
279 if( i && // Might be bottom or top...
280 i->is_con() )
281 return new (phase->C, 3) AddLNode(in1, phase->longcon(-i->get_con()));
283 // Convert "(x+c0) - y" into (x-y) + c0"
284 // Do not collapse (x+c0)-y if "+" is a loop increment or
285 // if "y" is a loop induction variable.
286 if( op1 == Op_AddL && ok_to_convert(in1, in2) ) {
287 Node *in11 = in1->in(1);
288 const Type *tadd = phase->type( in1->in(2) );
289 if( tadd->singleton() && tadd != Type::TOP ) {
290 Node *sub2 = phase->transform( new (phase->C, 3) SubLNode( in11, in2 ));
291 return new (phase->C, 3) AddLNode( sub2, in1->in(2) );
292 }
293 }
295 // Convert "x - (y+c0)" into "(x-y) - c0"
296 // Need the same check as in above optimization but reversed.
297 if (op2 == Op_AddL && ok_to_convert(in2, in1)) {
298 Node* in21 = in2->in(1);
299 Node* in22 = in2->in(2);
300 const TypeLong* tcon = phase->type(in22)->isa_long();
301 if (tcon != NULL && tcon->is_con()) {
302 Node* sub2 = phase->transform( new (phase->C, 3) SubLNode(in1, in21) );
303 Node* neg_c0 = phase->longcon(- tcon->get_con());
304 return new (phase->C, 3) AddLNode(sub2, neg_c0);
305 }
306 }
308 const Type *t1 = phase->type( in1 );
309 if( t1 == Type::TOP ) return NULL;
311 #ifdef ASSERT
312 // Check for dead loop
313 if( ( op2 == Op_AddL || op2 == Op_SubL ) &&
314 ( phase->eqv( in2->in(1), this ) || phase->eqv( in2->in(2), this ) ||
315 phase->eqv( in2->in(1), in2 ) || phase->eqv( in2->in(2), in2 ) ) )
316 assert(false, "dead loop in SubLNode::Ideal");
317 #endif
319 // Convert "x - (x+y)" into "-y"
320 if( op2 == Op_AddL &&
321 phase->eqv( in1, in2->in(1) ) )
322 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO), in2->in(2));
323 // Convert "x - (y+x)" into "-y"
324 if( op2 == Op_AddL &&
325 phase->eqv( in1, in2->in(2) ) )
326 return new (phase->C, 3) SubLNode( phase->makecon(TypeLong::ZERO),in2->in(1));
328 // Convert "0 - (x-y)" into "y-x"
329 if( phase->type( in1 ) == TypeLong::ZERO && op2 == Op_SubL )
330 return new (phase->C, 3) SubLNode( in2->in(2), in2->in(1) );
332 // Convert "(X+A) - (X+B)" into "A - B"
333 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(1) == in2->in(1) )
334 return new (phase->C, 3) SubLNode( in1->in(2), in2->in(2) );
336 // Convert "(A+X) - (B+X)" into "A - B"
337 if( op1 == Op_AddL && op2 == Op_AddL && in1->in(2) == in2->in(2) )
338 return new (phase->C, 3) SubLNode( in1->in(1), in2->in(1) );
340 // Convert "A-(B-C)" into (A+C)-B"
341 if( op2 == Op_SubL && in2->outcnt() == 1) {
342 Node *add1 = phase->transform( new (phase->C, 3) AddLNode( in1, in2->in(2) ) );
343 return new (phase->C, 3) SubLNode( add1, in2->in(1) );
344 }
346 return NULL;
347 }
349 //------------------------------sub--------------------------------------------
350 // A subtract node differences it's two inputs.
351 const Type *SubLNode::sub( const Type *t1, const Type *t2 ) const {
352 const TypeLong *r0 = t1->is_long(); // Handy access
353 const TypeLong *r1 = t2->is_long();
354 jlong lo = r0->_lo - r1->_hi;
355 jlong hi = r0->_hi - r1->_lo;
357 // We next check for 32-bit overflow.
358 // If that happens, we just assume all integers are possible.
359 if( (((r0->_lo ^ r1->_hi) >= 0) || // lo ends have same signs OR
360 ((r0->_lo ^ lo) >= 0)) && // lo results have same signs AND
361 (((r0->_hi ^ r1->_lo) >= 0) || // hi ends have same signs OR
362 ((r0->_hi ^ hi) >= 0)) ) // hi results have same signs
363 return TypeLong::make(lo,hi,MAX2(r0->_widen,r1->_widen));
364 else // Overflow; assume all integers
365 return TypeLong::LONG;
366 }
368 //=============================================================================
369 //------------------------------Value------------------------------------------
370 // A subtract node differences its two inputs.
371 const Type *SubFPNode::Value( PhaseTransform *phase ) const {
372 const Node* in1 = in(1);
373 const Node* in2 = in(2);
374 // Either input is TOP ==> the result is TOP
375 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
376 if( t1 == Type::TOP ) return Type::TOP;
377 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
378 if( t2 == Type::TOP ) return Type::TOP;
380 // if both operands are infinity of same sign, the result is NaN; do
381 // not replace with zero
382 if( (t1->is_finite() && t2->is_finite()) ) {
383 if( phase->eqv(in1, in2) ) return add_id();
384 }
386 // Either input is BOTTOM ==> the result is the local BOTTOM
387 const Type *bot = bottom_type();
388 if( (t1 == bot) || (t2 == bot) ||
389 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) )
390 return bot;
392 return sub(t1,t2); // Local flavor of type subtraction
393 }
396 //=============================================================================
397 //------------------------------Ideal------------------------------------------
398 Node *SubFNode::Ideal(PhaseGVN *phase, bool can_reshape) {
399 const Type *t2 = phase->type( in(2) );
400 // Convert "x-c0" into "x+ -c0".
401 if( t2->base() == Type::FloatCon ) { // Might be bottom or top...
402 // return new (phase->C, 3) AddFNode(in(1), phase->makecon( TypeF::make(-t2->getf()) ) );
403 }
405 // Not associative because of boundary conditions (infinity)
406 if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
407 // Convert "x - (x+y)" into "-y"
408 if( in(2)->is_Add() &&
409 phase->eqv(in(1),in(2)->in(1) ) )
410 return new (phase->C, 3) SubFNode( phase->makecon(TypeF::ZERO),in(2)->in(2));
411 }
413 // Cannot replace 0.0-X with -X because a 'fsub' bytecode computes
414 // 0.0-0.0 as +0.0, while a 'fneg' bytecode computes -0.0.
415 //if( phase->type(in(1)) == TypeF::ZERO )
416 //return new (phase->C, 2) NegFNode(in(2));
418 return NULL;
419 }
421 //------------------------------sub--------------------------------------------
422 // A subtract node differences its two inputs.
423 const Type *SubFNode::sub( const Type *t1, const Type *t2 ) const {
424 // no folding if one of operands is infinity or NaN, do not do constant folding
425 if( g_isfinite(t1->getf()) && g_isfinite(t2->getf()) ) {
426 return TypeF::make( t1->getf() - t2->getf() );
427 }
428 else if( g_isnan(t1->getf()) ) {
429 return t1;
430 }
431 else if( g_isnan(t2->getf()) ) {
432 return t2;
433 }
434 else {
435 return Type::FLOAT;
436 }
437 }
439 //=============================================================================
440 //------------------------------Ideal------------------------------------------
441 Node *SubDNode::Ideal(PhaseGVN *phase, bool can_reshape){
442 const Type *t2 = phase->type( in(2) );
443 // Convert "x-c0" into "x+ -c0".
444 if( t2->base() == Type::DoubleCon ) { // Might be bottom or top...
445 // return new (phase->C, 3) AddDNode(in(1), phase->makecon( TypeD::make(-t2->getd()) ) );
446 }
448 // Not associative because of boundary conditions (infinity)
449 if( IdealizedNumerics && !phase->C->method()->is_strict() ) {
450 // Convert "x - (x+y)" into "-y"
451 if( in(2)->is_Add() &&
452 phase->eqv(in(1),in(2)->in(1) ) )
453 return new (phase->C, 3) SubDNode( phase->makecon(TypeD::ZERO),in(2)->in(2));
454 }
456 // Cannot replace 0.0-X with -X because a 'dsub' bytecode computes
457 // 0.0-0.0 as +0.0, while a 'dneg' bytecode computes -0.0.
458 //if( phase->type(in(1)) == TypeD::ZERO )
459 //return new (phase->C, 2) NegDNode(in(2));
461 return NULL;
462 }
464 //------------------------------sub--------------------------------------------
465 // A subtract node differences its two inputs.
466 const Type *SubDNode::sub( const Type *t1, const Type *t2 ) const {
467 // no folding if one of operands is infinity or NaN, do not do constant folding
468 if( g_isfinite(t1->getd()) && g_isfinite(t2->getd()) ) {
469 return TypeD::make( t1->getd() - t2->getd() );
470 }
471 else if( g_isnan(t1->getd()) ) {
472 return t1;
473 }
474 else if( g_isnan(t2->getd()) ) {
475 return t2;
476 }
477 else {
478 return Type::DOUBLE;
479 }
480 }
482 //=============================================================================
483 //------------------------------Idealize---------------------------------------
484 // Unlike SubNodes, compare must still flatten return value to the
485 // range -1, 0, 1.
486 // And optimizations like those for (X + Y) - X fail if overflow happens.
487 Node *CmpNode::Identity( PhaseTransform *phase ) {
488 return this;
489 }
491 //=============================================================================
492 //------------------------------cmp--------------------------------------------
493 // Simplify a CmpI (compare 2 integers) node, based on local information.
494 // If both inputs are constants, compare them.
495 const Type *CmpINode::sub( const Type *t1, const Type *t2 ) const {
496 const TypeInt *r0 = t1->is_int(); // Handy access
497 const TypeInt *r1 = t2->is_int();
499 if( r0->_hi < r1->_lo ) // Range is always low?
500 return TypeInt::CC_LT;
501 else if( r0->_lo > r1->_hi ) // Range is always high?
502 return TypeInt::CC_GT;
504 else if( r0->is_con() && r1->is_con() ) { // comparing constants?
505 assert(r0->get_con() == r1->get_con(), "must be equal");
506 return TypeInt::CC_EQ; // Equal results.
507 } else if( r0->_hi == r1->_lo ) // Range is never high?
508 return TypeInt::CC_LE;
509 else if( r0->_lo == r1->_hi ) // Range is never low?
510 return TypeInt::CC_GE;
511 return TypeInt::CC; // else use worst case results
512 }
514 // Simplify a CmpU (compare 2 integers) node, based on local information.
515 // If both inputs are constants, compare them.
516 const Type *CmpUNode::sub( const Type *t1, const Type *t2 ) const {
517 assert(!t1->isa_ptr(), "obsolete usage of CmpU");
519 // comparing two unsigned ints
520 const TypeInt *r0 = t1->is_int(); // Handy access
521 const TypeInt *r1 = t2->is_int();
523 // Current installed version
524 // Compare ranges for non-overlap
525 juint lo0 = r0->_lo;
526 juint hi0 = r0->_hi;
527 juint lo1 = r1->_lo;
528 juint hi1 = r1->_hi;
530 // If either one has both negative and positive values,
531 // it therefore contains both 0 and -1, and since [0..-1] is the
532 // full unsigned range, the type must act as an unsigned bottom.
533 bool bot0 = ((jint)(lo0 ^ hi0) < 0);
534 bool bot1 = ((jint)(lo1 ^ hi1) < 0);
536 if (bot0 || bot1) {
537 // All unsigned values are LE -1 and GE 0.
538 if (lo0 == 0 && hi0 == 0) {
539 return TypeInt::CC_LE; // 0 <= bot
540 } else if (lo1 == 0 && hi1 == 0) {
541 return TypeInt::CC_GE; // bot >= 0
542 }
543 } else {
544 // We can use ranges of the form [lo..hi] if signs are the same.
545 assert(lo0 <= hi0 && lo1 <= hi1, "unsigned ranges are valid");
546 // results are reversed, '-' > '+' for unsigned compare
547 if (hi0 < lo1) {
548 return TypeInt::CC_LT; // smaller
549 } else if (lo0 > hi1) {
550 return TypeInt::CC_GT; // greater
551 } else if (hi0 == lo1 && lo0 == hi1) {
552 return TypeInt::CC_EQ; // Equal results
553 } else if (lo0 >= hi1) {
554 return TypeInt::CC_GE;
555 } else if (hi0 <= lo1) {
556 // Check for special case in Hashtable::get. (See below.)
557 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check())
558 return TypeInt::CC_LT;
559 return TypeInt::CC_LE;
560 }
561 }
562 // Check for special case in Hashtable::get - the hash index is
563 // mod'ed to the table size so the following range check is useless.
564 // Check for: (X Mod Y) CmpU Y, where the mod result and Y both have
565 // to be positive.
566 // (This is a gross hack, since the sub method never
567 // looks at the structure of the node in any other case.)
568 if ((jint)lo0 >= 0 && (jint)lo1 >= 0 && is_index_range_check())
569 return TypeInt::CC_LT;
570 return TypeInt::CC; // else use worst case results
571 }
573 bool CmpUNode::is_index_range_check() const {
574 // Check for the "(X ModI Y) CmpU Y" shape
575 return (in(1)->Opcode() == Op_ModI &&
576 in(1)->in(2)->eqv_uncast(in(2)));
577 }
579 //------------------------------Idealize---------------------------------------
580 Node *CmpINode::Ideal( PhaseGVN *phase, bool can_reshape ) {
581 if (phase->type(in(2))->higher_equal(TypeInt::ZERO)) {
582 switch (in(1)->Opcode()) {
583 case Op_CmpL3: // Collapse a CmpL3/CmpI into a CmpL
584 return new (phase->C, 3) CmpLNode(in(1)->in(1),in(1)->in(2));
585 case Op_CmpF3: // Collapse a CmpF3/CmpI into a CmpF
586 return new (phase->C, 3) CmpFNode(in(1)->in(1),in(1)->in(2));
587 case Op_CmpD3: // Collapse a CmpD3/CmpI into a CmpD
588 return new (phase->C, 3) CmpDNode(in(1)->in(1),in(1)->in(2));
589 //case Op_SubI:
590 // If (x - y) cannot overflow, then ((x - y) <?> 0)
591 // can be turned into (x <?> y).
592 // This is handled (with more general cases) by Ideal_sub_algebra.
593 }
594 }
595 return NULL; // No change
596 }
599 //=============================================================================
600 // Simplify a CmpL (compare 2 longs ) node, based on local information.
601 // If both inputs are constants, compare them.
602 const Type *CmpLNode::sub( const Type *t1, const Type *t2 ) const {
603 const TypeLong *r0 = t1->is_long(); // Handy access
604 const TypeLong *r1 = t2->is_long();
606 if( r0->_hi < r1->_lo ) // Range is always low?
607 return TypeInt::CC_LT;
608 else if( r0->_lo > r1->_hi ) // Range is always high?
609 return TypeInt::CC_GT;
611 else if( r0->is_con() && r1->is_con() ) { // comparing constants?
612 assert(r0->get_con() == r1->get_con(), "must be equal");
613 return TypeInt::CC_EQ; // Equal results.
614 } else if( r0->_hi == r1->_lo ) // Range is never high?
615 return TypeInt::CC_LE;
616 else if( r0->_lo == r1->_hi ) // Range is never low?
617 return TypeInt::CC_GE;
618 return TypeInt::CC; // else use worst case results
619 }
621 //=============================================================================
622 //------------------------------sub--------------------------------------------
623 // Simplify an CmpP (compare 2 pointers) node, based on local information.
624 // If both inputs are constants, compare them.
625 const Type *CmpPNode::sub( const Type *t1, const Type *t2 ) const {
626 const TypePtr *r0 = t1->is_ptr(); // Handy access
627 const TypePtr *r1 = t2->is_ptr();
629 // Undefined inputs makes for an undefined result
630 if( TypePtr::above_centerline(r0->_ptr) ||
631 TypePtr::above_centerline(r1->_ptr) )
632 return Type::TOP;
634 if (r0 == r1 && r0->singleton()) {
635 // Equal pointer constants (klasses, nulls, etc.)
636 return TypeInt::CC_EQ;
637 }
639 // See if it is 2 unrelated classes.
640 const TypeOopPtr* p0 = r0->isa_oopptr();
641 const TypeOopPtr* p1 = r1->isa_oopptr();
642 if (p0 && p1) {
643 Node* in1 = in(1)->uncast();
644 Node* in2 = in(2)->uncast();
645 AllocateNode* alloc1 = AllocateNode::Ideal_allocation(in1, NULL);
646 AllocateNode* alloc2 = AllocateNode::Ideal_allocation(in2, NULL);
647 if (MemNode::detect_ptr_independence(in1, alloc1, in2, alloc2, NULL)) {
648 return TypeInt::CC_GT; // different pointers
649 }
650 ciKlass* klass0 = p0->klass();
651 bool xklass0 = p0->klass_is_exact();
652 ciKlass* klass1 = p1->klass();
653 bool xklass1 = p1->klass_is_exact();
654 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);
655 if (klass0 && klass1 &&
656 kps != 1 && // both or neither are klass pointers
657 klass0->is_loaded() && !klass0->is_interface() && // do not trust interfaces
658 klass1->is_loaded() && !klass1->is_interface() &&
659 (!klass0->is_obj_array_klass() ||
660 !klass0->as_obj_array_klass()->base_element_klass()->is_interface()) &&
661 (!klass1->is_obj_array_klass() ||
662 !klass1->as_obj_array_klass()->base_element_klass()->is_interface())) {
663 bool unrelated_classes = false;
664 // See if neither subclasses the other, or if the class on top
665 // is precise. In either of these cases, the compare is known
666 // to fail if at least one of the pointers is provably not null.
667 if (klass0->equals(klass1) || // if types are unequal but klasses are
668 !klass0->is_java_klass() || // types not part of Java language?
669 !klass1->is_java_klass()) { // types not part of Java language?
670 // Do nothing; we know nothing for imprecise types
671 } else if (klass0->is_subtype_of(klass1)) {
672 // If klass1's type is PRECISE, then classes are unrelated.
673 unrelated_classes = xklass1;
674 } else if (klass1->is_subtype_of(klass0)) {
675 // If klass0's type is PRECISE, then classes are unrelated.
676 unrelated_classes = xklass0;
677 } else { // Neither subtypes the other
678 unrelated_classes = true;
679 }
680 if (unrelated_classes) {
681 // The oops classes are known to be unrelated. If the joined PTRs of
682 // two oops is not Null and not Bottom, then we are sure that one
683 // of the two oops is non-null, and the comparison will always fail.
684 TypePtr::PTR jp = r0->join_ptr(r1->_ptr);
685 if (jp != TypePtr::Null && jp != TypePtr::BotPTR) {
686 return TypeInt::CC_GT;
687 }
688 }
689 }
690 }
692 // Known constants can be compared exactly
693 // Null can be distinguished from any NotNull pointers
694 // Unknown inputs makes an unknown result
695 if( r0->singleton() ) {
696 intptr_t bits0 = r0->get_con();
697 if( r1->singleton() )
698 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
699 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
700 } else if( r1->singleton() ) {
701 intptr_t bits1 = r1->get_con();
702 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
703 } else
704 return TypeInt::CC;
705 }
707 static inline Node* isa_java_mirror_load(PhaseGVN* phase, Node* n) {
708 // Return the klass node for
709 // LoadP(AddP(foo:Klass, #java_mirror))
710 // or NULL if not matching.
711 if (n->Opcode() != Op_LoadP) return NULL;
713 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
714 if (!tp || tp->klass() != phase->C->env()->Class_klass()) return NULL;
716 Node* adr = n->in(MemNode::Address);
717 intptr_t off = 0;
718 Node* k = AddPNode::Ideal_base_and_offset(adr, phase, off);
719 if (k == NULL) return NULL;
720 const TypeKlassPtr* tkp = phase->type(k)->isa_klassptr();
721 if (!tkp || off != in_bytes(Klass::java_mirror_offset())) return NULL;
723 // We've found the klass node of a Java mirror load.
724 return k;
725 }
727 static inline Node* isa_const_java_mirror(PhaseGVN* phase, Node* n) {
728 // for ConP(Foo.class) return ConP(Foo.klass)
729 // otherwise return NULL
730 if (!n->is_Con()) return NULL;
732 const TypeInstPtr* tp = phase->type(n)->isa_instptr();
733 if (!tp) return NULL;
735 ciType* mirror_type = tp->java_mirror_type();
736 // TypeInstPtr::java_mirror_type() returns non-NULL for compile-
737 // time Class constants only.
738 if (!mirror_type) return NULL;
740 // x.getClass() == int.class can never be true (for all primitive types)
741 // Return a ConP(NULL) node for this case.
742 if (mirror_type->is_classless()) {
743 return phase->makecon(TypePtr::NULL_PTR);
744 }
746 // return the ConP(Foo.klass)
747 assert(mirror_type->is_klass(), "mirror_type should represent a klassOop");
748 return phase->makecon(TypeKlassPtr::make(mirror_type->as_klass()));
749 }
751 //------------------------------Ideal------------------------------------------
752 // Normalize comparisons between Java mirror loads to compare the klass instead.
753 //
754 // Also check for the case of comparing an unknown klass loaded from the primary
755 // super-type array vs a known klass with no subtypes. This amounts to
756 // checking to see an unknown klass subtypes a known klass with no subtypes;
757 // this only happens on an exact match. We can shorten this test by 1 load.
758 Node *CmpPNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
759 // Normalize comparisons between Java mirrors into comparisons of the low-
760 // level klass, where a dependent load could be shortened.
761 //
762 // The new pattern has a nice effect of matching the same pattern used in the
763 // fast path of instanceof/checkcast/Class.isInstance(), which allows
764 // redundant exact type check be optimized away by GVN.
765 // For example, in
766 // if (x.getClass() == Foo.class) {
767 // Foo foo = (Foo) x;
768 // // ... use a ...
769 // }
770 // a CmpPNode could be shared between if_acmpne and checkcast
771 {
772 Node* k1 = isa_java_mirror_load(phase, in(1));
773 Node* k2 = isa_java_mirror_load(phase, in(2));
774 Node* conk2 = isa_const_java_mirror(phase, in(2));
776 if (k1 && (k2 || conk2)) {
777 Node* lhs = k1;
778 Node* rhs = (k2 != NULL) ? k2 : conk2;
779 this->set_req(1, lhs);
780 this->set_req(2, rhs);
781 return this;
782 }
783 }
785 // Constant pointer on right?
786 const TypeKlassPtr* t2 = phase->type(in(2))->isa_klassptr();
787 if (t2 == NULL || !t2->klass_is_exact())
788 return NULL;
789 // Get the constant klass we are comparing to.
790 ciKlass* superklass = t2->klass();
792 // Now check for LoadKlass on left.
793 Node* ldk1 = in(1);
794 if (ldk1->is_DecodeN()) {
795 ldk1 = ldk1->in(1);
796 if (ldk1->Opcode() != Op_LoadNKlass )
797 return NULL;
798 } else if (ldk1->Opcode() != Op_LoadKlass )
799 return NULL;
800 // Take apart the address of the LoadKlass:
801 Node* adr1 = ldk1->in(MemNode::Address);
802 intptr_t con2 = 0;
803 Node* ldk2 = AddPNode::Ideal_base_and_offset(adr1, phase, con2);
804 if (ldk2 == NULL)
805 return NULL;
806 if (con2 == oopDesc::klass_offset_in_bytes()) {
807 // We are inspecting an object's concrete class.
808 // Short-circuit the check if the query is abstract.
809 if (superklass->is_interface() ||
810 superklass->is_abstract()) {
811 // Make it come out always false:
812 this->set_req(2, phase->makecon(TypePtr::NULL_PTR));
813 return this;
814 }
815 }
817 // Check for a LoadKlass from primary supertype array.
818 // Any nested loadklass from loadklass+con must be from the p.s. array.
819 if (ldk2->is_DecodeN()) {
820 // Keep ldk2 as DecodeN since it could be used in CmpP below.
821 if (ldk2->in(1)->Opcode() != Op_LoadNKlass )
822 return NULL;
823 } else if (ldk2->Opcode() != Op_LoadKlass)
824 return NULL;
826 // Verify that we understand the situation
827 if (con2 != (intptr_t) superklass->super_check_offset())
828 return NULL; // Might be element-klass loading from array klass
830 // If 'superklass' has no subklasses and is not an interface, then we are
831 // assured that the only input which will pass the type check is
832 // 'superklass' itself.
833 //
834 // We could be more liberal here, and allow the optimization on interfaces
835 // which have a single implementor. This would require us to increase the
836 // expressiveness of the add_dependency() mechanism.
837 // %%% Do this after we fix TypeOopPtr: Deps are expressive enough now.
839 // Object arrays must have their base element have no subtypes
840 while (superklass->is_obj_array_klass()) {
841 ciType* elem = superklass->as_obj_array_klass()->element_type();
842 superklass = elem->as_klass();
843 }
844 if (superklass->is_instance_klass()) {
845 ciInstanceKlass* ik = superklass->as_instance_klass();
846 if (ik->has_subklass() || ik->is_interface()) return NULL;
847 // Add a dependency if there is a chance that a subclass will be added later.
848 if (!ik->is_final()) {
849 phase->C->dependencies()->assert_leaf_type(ik);
850 }
851 }
853 // Bypass the dependent load, and compare directly
854 this->set_req(1,ldk2);
856 return this;
857 }
859 //=============================================================================
860 //------------------------------sub--------------------------------------------
861 // Simplify an CmpN (compare 2 pointers) node, based on local information.
862 // If both inputs are constants, compare them.
863 const Type *CmpNNode::sub( const Type *t1, const Type *t2 ) const {
864 const TypePtr *r0 = t1->make_ptr(); // Handy access
865 const TypePtr *r1 = t2->make_ptr();
867 // Undefined inputs makes for an undefined result
868 if( TypePtr::above_centerline(r0->_ptr) ||
869 TypePtr::above_centerline(r1->_ptr) )
870 return Type::TOP;
872 if (r0 == r1 && r0->singleton()) {
873 // Equal pointer constants (klasses, nulls, etc.)
874 return TypeInt::CC_EQ;
875 }
877 // See if it is 2 unrelated classes.
878 const TypeOopPtr* p0 = r0->isa_oopptr();
879 const TypeOopPtr* p1 = r1->isa_oopptr();
880 if (p0 && p1) {
881 ciKlass* klass0 = p0->klass();
882 bool xklass0 = p0->klass_is_exact();
883 ciKlass* klass1 = p1->klass();
884 bool xklass1 = p1->klass_is_exact();
885 int kps = (p0->isa_klassptr()?1:0) + (p1->isa_klassptr()?1:0);
886 if (klass0 && klass1 &&
887 kps != 1 && // both or neither are klass pointers
888 !klass0->is_interface() && // do not trust interfaces
889 !klass1->is_interface()) {
890 bool unrelated_classes = false;
891 // See if neither subclasses the other, or if the class on top
892 // is precise. In either of these cases, the compare is known
893 // to fail if at least one of the pointers is provably not null.
894 if (klass0->equals(klass1) || // if types are unequal but klasses are
895 !klass0->is_java_klass() || // types not part of Java language?
896 !klass1->is_java_klass()) { // types not part of Java language?
897 // Do nothing; we know nothing for imprecise types
898 } else if (klass0->is_subtype_of(klass1)) {
899 // If klass1's type is PRECISE, then classes are unrelated.
900 unrelated_classes = xklass1;
901 } else if (klass1->is_subtype_of(klass0)) {
902 // If klass0's type is PRECISE, then classes are unrelated.
903 unrelated_classes = xklass0;
904 } else { // Neither subtypes the other
905 unrelated_classes = true;
906 }
907 if (unrelated_classes) {
908 // The oops classes are known to be unrelated. If the joined PTRs of
909 // two oops is not Null and not Bottom, then we are sure that one
910 // of the two oops is non-null, and the comparison will always fail.
911 TypePtr::PTR jp = r0->join_ptr(r1->_ptr);
912 if (jp != TypePtr::Null && jp != TypePtr::BotPTR) {
913 return TypeInt::CC_GT;
914 }
915 }
916 }
917 }
919 // Known constants can be compared exactly
920 // Null can be distinguished from any NotNull pointers
921 // Unknown inputs makes an unknown result
922 if( r0->singleton() ) {
923 intptr_t bits0 = r0->get_con();
924 if( r1->singleton() )
925 return bits0 == r1->get_con() ? TypeInt::CC_EQ : TypeInt::CC_GT;
926 return ( r1->_ptr == TypePtr::NotNull && bits0==0 ) ? TypeInt::CC_GT : TypeInt::CC;
927 } else if( r1->singleton() ) {
928 intptr_t bits1 = r1->get_con();
929 return ( r0->_ptr == TypePtr::NotNull && bits1==0 ) ? TypeInt::CC_GT : TypeInt::CC;
930 } else
931 return TypeInt::CC;
932 }
934 //------------------------------Ideal------------------------------------------
935 Node *CmpNNode::Ideal( PhaseGVN *phase, bool can_reshape ) {
936 return NULL;
937 }
939 //=============================================================================
940 //------------------------------Value------------------------------------------
941 // Simplify an CmpF (compare 2 floats ) node, based on local information.
942 // If both inputs are constants, compare them.
943 const Type *CmpFNode::Value( PhaseTransform *phase ) const {
944 const Node* in1 = in(1);
945 const Node* in2 = in(2);
946 // Either input is TOP ==> the result is TOP
947 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
948 if( t1 == Type::TOP ) return Type::TOP;
949 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
950 if( t2 == Type::TOP ) return Type::TOP;
952 // Not constants? Don't know squat - even if they are the same
953 // value! If they are NaN's they compare to LT instead of EQ.
954 const TypeF *tf1 = t1->isa_float_constant();
955 const TypeF *tf2 = t2->isa_float_constant();
956 if( !tf1 || !tf2 ) return TypeInt::CC;
958 // This implements the Java bytecode fcmpl, so unordered returns -1.
959 if( tf1->is_nan() || tf2->is_nan() )
960 return TypeInt::CC_LT;
962 if( tf1->_f < tf2->_f ) return TypeInt::CC_LT;
963 if( tf1->_f > tf2->_f ) return TypeInt::CC_GT;
964 assert( tf1->_f == tf2->_f, "do not understand FP behavior" );
965 return TypeInt::CC_EQ;
966 }
969 //=============================================================================
970 //------------------------------Value------------------------------------------
971 // Simplify an CmpD (compare 2 doubles ) node, based on local information.
972 // If both inputs are constants, compare them.
973 const Type *CmpDNode::Value( PhaseTransform *phase ) const {
974 const Node* in1 = in(1);
975 const Node* in2 = in(2);
976 // Either input is TOP ==> the result is TOP
977 const Type* t1 = (in1 == this) ? Type::TOP : phase->type(in1);
978 if( t1 == Type::TOP ) return Type::TOP;
979 const Type* t2 = (in2 == this) ? Type::TOP : phase->type(in2);
980 if( t2 == Type::TOP ) return Type::TOP;
982 // Not constants? Don't know squat - even if they are the same
983 // value! If they are NaN's they compare to LT instead of EQ.
984 const TypeD *td1 = t1->isa_double_constant();
985 const TypeD *td2 = t2->isa_double_constant();
986 if( !td1 || !td2 ) return TypeInt::CC;
988 // This implements the Java bytecode dcmpl, so unordered returns -1.
989 if( td1->is_nan() || td2->is_nan() )
990 return TypeInt::CC_LT;
992 if( td1->_d < td2->_d ) return TypeInt::CC_LT;
993 if( td1->_d > td2->_d ) return TypeInt::CC_GT;
994 assert( td1->_d == td2->_d, "do not understand FP behavior" );
995 return TypeInt::CC_EQ;
996 }
998 //------------------------------Ideal------------------------------------------
999 Node *CmpDNode::Ideal(PhaseGVN *phase, bool can_reshape){
1000 // Check if we can change this to a CmpF and remove a ConvD2F operation.
1001 // Change (CMPD (F2D (float)) (ConD value))
1002 // To (CMPF (float) (ConF value))
1003 // Valid when 'value' does not lose precision as a float.
1004 // Benefits: eliminates conversion, does not require 24-bit mode
1006 // NaNs prevent commuting operands. This transform works regardless of the
1007 // order of ConD and ConvF2D inputs by preserving the original order.
1008 int idx_f2d = 1; // ConvF2D on left side?
1009 if( in(idx_f2d)->Opcode() != Op_ConvF2D )
1010 idx_f2d = 2; // No, swap to check for reversed args
1011 int idx_con = 3-idx_f2d; // Check for the constant on other input
1013 if( ConvertCmpD2CmpF &&
1014 in(idx_f2d)->Opcode() == Op_ConvF2D &&
1015 in(idx_con)->Opcode() == Op_ConD ) {
1016 const TypeD *t2 = in(idx_con)->bottom_type()->is_double_constant();
1017 double t2_value_as_double = t2->_d;
1018 float t2_value_as_float = (float)t2_value_as_double;
1019 if( t2_value_as_double == (double)t2_value_as_float ) {
1020 // Test value can be represented as a float
1021 // Eliminate the conversion to double and create new comparison
1022 Node *new_in1 = in(idx_f2d)->in(1);
1023 Node *new_in2 = phase->makecon( TypeF::make(t2_value_as_float) );
1024 if( idx_f2d != 1 ) { // Must flip args to match original order
1025 Node *tmp = new_in1;
1026 new_in1 = new_in2;
1027 new_in2 = tmp;
1028 }
1029 CmpFNode *new_cmp = (Opcode() == Op_CmpD3)
1030 ? new (phase->C, 3) CmpF3Node( new_in1, new_in2 )
1031 : new (phase->C, 3) CmpFNode ( new_in1, new_in2 ) ;
1032 return new_cmp; // Changed to CmpFNode
1033 }
1034 // Testing value required the precision of a double
1035 }
1036 return NULL; // No change
1037 }
1040 //=============================================================================
1041 //------------------------------cc2logical-------------------------------------
1042 // Convert a condition code type to a logical type
1043 const Type *BoolTest::cc2logical( const Type *CC ) const {
1044 if( CC == Type::TOP ) return Type::TOP;
1045 if( CC->base() != Type::Int ) return TypeInt::BOOL; // Bottom or worse
1046 const TypeInt *ti = CC->is_int();
1047 if( ti->is_con() ) { // Only 1 kind of condition codes set?
1048 // Match low order 2 bits
1049 int tmp = ((ti->get_con()&3) == (_test&3)) ? 1 : 0;
1050 if( _test & 4 ) tmp = 1-tmp; // Optionally complement result
1051 return TypeInt::make(tmp); // Boolean result
1052 }
1054 if( CC == TypeInt::CC_GE ) {
1055 if( _test == ge ) return TypeInt::ONE;
1056 if( _test == lt ) return TypeInt::ZERO;
1057 }
1058 if( CC == TypeInt::CC_LE ) {
1059 if( _test == le ) return TypeInt::ONE;
1060 if( _test == gt ) return TypeInt::ZERO;
1061 }
1063 return TypeInt::BOOL;
1064 }
1066 //------------------------------dump_spec-------------------------------------
1067 // Print special per-node info
1068 #ifndef PRODUCT
1069 void BoolTest::dump_on(outputStream *st) const {
1070 const char *msg[] = {"eq","gt","??","lt","ne","le","??","ge"};
1071 st->print(msg[_test]);
1072 }
1073 #endif
1075 //=============================================================================
1076 uint BoolNode::hash() const { return (Node::hash() << 3)|(_test._test+1); }
1077 uint BoolNode::size_of() const { return sizeof(BoolNode); }
1079 //------------------------------operator==-------------------------------------
1080 uint BoolNode::cmp( const Node &n ) const {
1081 const BoolNode *b = (const BoolNode *)&n; // Cast up
1082 return (_test._test == b->_test._test);
1083 }
1085 //------------------------------clone_cmp--------------------------------------
1086 // Clone a compare/bool tree
1087 static Node *clone_cmp( Node *cmp, Node *cmp1, Node *cmp2, PhaseGVN *gvn, BoolTest::mask test ) {
1088 Node *ncmp = cmp->clone();
1089 ncmp->set_req(1,cmp1);
1090 ncmp->set_req(2,cmp2);
1091 ncmp = gvn->transform( ncmp );
1092 return new (gvn->C, 2) BoolNode( ncmp, test );
1093 }
1095 //-------------------------------make_predicate--------------------------------
1096 Node* BoolNode::make_predicate(Node* test_value, PhaseGVN* phase) {
1097 if (test_value->is_Con()) return test_value;
1098 if (test_value->is_Bool()) return test_value;
1099 Compile* C = phase->C;
1100 if (test_value->is_CMove() &&
1101 test_value->in(CMoveNode::Condition)->is_Bool()) {
1102 BoolNode* bol = test_value->in(CMoveNode::Condition)->as_Bool();
1103 const Type* ftype = phase->type(test_value->in(CMoveNode::IfFalse));
1104 const Type* ttype = phase->type(test_value->in(CMoveNode::IfTrue));
1105 if (ftype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ttype)) {
1106 return bol;
1107 } else if (ttype == TypeInt::ZERO && !TypeInt::ZERO->higher_equal(ftype)) {
1108 return phase->transform( bol->negate(phase) );
1109 }
1110 // Else fall through. The CMove gets in the way of the test.
1111 // It should be the case that make_predicate(bol->as_int_value()) == bol.
1112 }
1113 Node* cmp = new (C, 3) CmpINode(test_value, phase->intcon(0));
1114 cmp = phase->transform(cmp);
1115 Node* bol = new (C, 2) BoolNode(cmp, BoolTest::ne);
1116 return phase->transform(bol);
1117 }
1119 //--------------------------------as_int_value---------------------------------
1120 Node* BoolNode::as_int_value(PhaseGVN* phase) {
1121 // Inverse to make_predicate. The CMove probably boils down to a Conv2B.
1122 Node* cmov = CMoveNode::make(phase->C, NULL, this,
1123 phase->intcon(0), phase->intcon(1),
1124 TypeInt::BOOL);
1125 return phase->transform(cmov);
1126 }
1128 //----------------------------------negate-------------------------------------
1129 BoolNode* BoolNode::negate(PhaseGVN* phase) {
1130 Compile* C = phase->C;
1131 return new (C, 2) BoolNode(in(1), _test.negate());
1132 }
1135 //------------------------------Ideal------------------------------------------
1136 Node *BoolNode::Ideal(PhaseGVN *phase, bool can_reshape) {
1137 // Change "bool tst (cmp con x)" into "bool ~tst (cmp x con)".
1138 // This moves the constant to the right. Helps value-numbering.
1139 Node *cmp = in(1);
1140 if( !cmp->is_Sub() ) return NULL;
1141 int cop = cmp->Opcode();
1142 if( cop == Op_FastLock || cop == Op_FastUnlock ) return NULL;
1143 Node *cmp1 = cmp->in(1);
1144 Node *cmp2 = cmp->in(2);
1145 if( !cmp1 ) return NULL;
1147 // Constant on left?
1148 Node *con = cmp1;
1149 uint op2 = cmp2->Opcode();
1150 // Move constants to the right of compare's to canonicalize.
1151 // Do not muck with Opaque1 nodes, as this indicates a loop
1152 // guard that cannot change shape.
1153 if( con->is_Con() && !cmp2->is_Con() && op2 != Op_Opaque1 &&
1154 // Because of NaN's, CmpD and CmpF are not commutative
1155 cop != Op_CmpD && cop != Op_CmpF &&
1156 // Protect against swapping inputs to a compare when it is used by a
1157 // counted loop exit, which requires maintaining the loop-limit as in(2)
1158 !is_counted_loop_exit_test() ) {
1159 // Ok, commute the constant to the right of the cmp node.
1160 // Clone the Node, getting a new Node of the same class
1161 cmp = cmp->clone();
1162 // Swap inputs to the clone
1163 cmp->swap_edges(1, 2);
1164 cmp = phase->transform( cmp );
1165 return new (phase->C, 2) BoolNode( cmp, _test.commute() );
1166 }
1168 // Change "bool eq/ne (cmp (xor X 1) 0)" into "bool ne/eq (cmp X 0)".
1169 // The XOR-1 is an idiom used to flip the sense of a bool. We flip the
1170 // test instead.
1171 int cmp1_op = cmp1->Opcode();
1172 const TypeInt* cmp2_type = phase->type(cmp2)->isa_int();
1173 if (cmp2_type == NULL) return NULL;
1174 Node* j_xor = cmp1;
1175 if( cmp2_type == TypeInt::ZERO &&
1176 cmp1_op == Op_XorI &&
1177 j_xor->in(1) != j_xor && // An xor of itself is dead
1178 phase->type( j_xor->in(1) ) == TypeInt::BOOL &&
1179 phase->type( j_xor->in(2) ) == TypeInt::ONE &&
1180 (_test._test == BoolTest::eq ||
1181 _test._test == BoolTest::ne) ) {
1182 Node *ncmp = phase->transform(new (phase->C, 3) CmpINode(j_xor->in(1),cmp2));
1183 return new (phase->C, 2) BoolNode( ncmp, _test.negate() );
1184 }
1186 // Change "bool eq/ne (cmp (Conv2B X) 0)" into "bool eq/ne (cmp X 0)".
1187 // This is a standard idiom for branching on a boolean value.
1188 Node *c2b = cmp1;
1189 if( cmp2_type == TypeInt::ZERO &&
1190 cmp1_op == Op_Conv2B &&
1191 (_test._test == BoolTest::eq ||
1192 _test._test == BoolTest::ne) ) {
1193 Node *ncmp = phase->transform(phase->type(c2b->in(1))->isa_int()
1194 ? (Node*)new (phase->C, 3) CmpINode(c2b->in(1),cmp2)
1195 : (Node*)new (phase->C, 3) CmpPNode(c2b->in(1),phase->makecon(TypePtr::NULL_PTR))
1196 );
1197 return new (phase->C, 2) BoolNode( ncmp, _test._test );
1198 }
1200 // Comparing a SubI against a zero is equal to comparing the SubI
1201 // arguments directly. This only works for eq and ne comparisons
1202 // due to possible integer overflow.
1203 if ((_test._test == BoolTest::eq || _test._test == BoolTest::ne) &&
1204 (cop == Op_CmpI) &&
1205 (cmp1->Opcode() == Op_SubI) &&
1206 ( cmp2_type == TypeInt::ZERO ) ) {
1207 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(1),cmp1->in(2)));
1208 return new (phase->C, 2) BoolNode( ncmp, _test._test );
1209 }
1211 // Change (-A vs 0) into (A vs 0) by commuting the test. Disallow in the
1212 // most general case because negating 0x80000000 does nothing. Needed for
1213 // the CmpF3/SubI/CmpI idiom.
1214 if( cop == Op_CmpI &&
1215 cmp1->Opcode() == Op_SubI &&
1216 cmp2_type == TypeInt::ZERO &&
1217 phase->type( cmp1->in(1) ) == TypeInt::ZERO &&
1218 phase->type( cmp1->in(2) )->higher_equal(TypeInt::SYMINT) ) {
1219 Node *ncmp = phase->transform( new (phase->C, 3) CmpINode(cmp1->in(2),cmp2));
1220 return new (phase->C, 2) BoolNode( ncmp, _test.commute() );
1221 }
1223 // The transformation below is not valid for either signed or unsigned
1224 // comparisons due to wraparound concerns at MAX_VALUE and MIN_VALUE.
1225 // This transformation can be resurrected when we are able to
1226 // make inferences about the range of values being subtracted from
1227 // (or added to) relative to the wraparound point.
1228 //
1229 // // Remove +/-1's if possible.
1230 // // "X <= Y-1" becomes "X < Y"
1231 // // "X+1 <= Y" becomes "X < Y"
1232 // // "X < Y+1" becomes "X <= Y"
1233 // // "X-1 < Y" becomes "X <= Y"
1234 // // Do not this to compares off of the counted-loop-end. These guys are
1235 // // checking the trip counter and they want to use the post-incremented
1236 // // counter. If they use the PRE-incremented counter, then the counter has
1237 // // to be incremented in a private block on a loop backedge.
1238 // if( du && du->cnt(this) && du->out(this)[0]->Opcode() == Op_CountedLoopEnd )
1239 // return NULL;
1240 // #ifndef PRODUCT
1241 // // Do not do this in a wash GVN pass during verification.
1242 // // Gets triggered by too many simple optimizations to be bothered with
1243 // // re-trying it again and again.
1244 // if( !phase->allow_progress() ) return NULL;
1245 // #endif
1246 // // Not valid for unsigned compare because of corner cases in involving zero.
1247 // // For example, replacing "X-1 <u Y" with "X <=u Y" fails to throw an
1248 // // exception in case X is 0 (because 0-1 turns into 4billion unsigned but
1249 // // "0 <=u Y" is always true).
1250 // if( cmp->Opcode() == Op_CmpU ) return NULL;
1251 // int cmp2_op = cmp2->Opcode();
1252 // if( _test._test == BoolTest::le ) {
1253 // if( cmp1_op == Op_AddI &&
1254 // phase->type( cmp1->in(2) ) == TypeInt::ONE )
1255 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::lt );
1256 // else if( cmp2_op == Op_AddI &&
1257 // phase->type( cmp2->in(2) ) == TypeInt::MINUS_1 )
1258 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::lt );
1259 // } else if( _test._test == BoolTest::lt ) {
1260 // if( cmp1_op == Op_AddI &&
1261 // phase->type( cmp1->in(2) ) == TypeInt::MINUS_1 )
1262 // return clone_cmp( cmp, cmp1->in(1), cmp2, phase, BoolTest::le );
1263 // else if( cmp2_op == Op_AddI &&
1264 // phase->type( cmp2->in(2) ) == TypeInt::ONE )
1265 // return clone_cmp( cmp, cmp1, cmp2->in(1), phase, BoolTest::le );
1266 // }
1268 return NULL;
1269 }
1271 //------------------------------Value------------------------------------------
1272 // Simplify a Bool (convert condition codes to boolean (1 or 0)) node,
1273 // based on local information. If the input is constant, do it.
1274 const Type *BoolNode::Value( PhaseTransform *phase ) const {
1275 return _test.cc2logical( phase->type( in(1) ) );
1276 }
1278 //------------------------------dump_spec--------------------------------------
1279 // Dump special per-node info
1280 #ifndef PRODUCT
1281 void BoolNode::dump_spec(outputStream *st) const {
1282 st->print("[");
1283 _test.dump_on(st);
1284 st->print("]");
1285 }
1286 #endif
1288 //------------------------------is_counted_loop_exit_test--------------------------------------
1289 // Returns true if node is used by a counted loop node.
1290 bool BoolNode::is_counted_loop_exit_test() {
1291 for( DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++ ) {
1292 Node* use = fast_out(i);
1293 if (use->is_CountedLoopEnd()) {
1294 return true;
1295 }
1296 }
1297 return false;
1298 }
1300 //=============================================================================
1301 //------------------------------Value------------------------------------------
1302 // Compute sqrt
1303 const Type *SqrtDNode::Value( PhaseTransform *phase ) const {
1304 const Type *t1 = phase->type( in(1) );
1305 if( t1 == Type::TOP ) return Type::TOP;
1306 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1307 double d = t1->getd();
1308 if( d < 0.0 ) return Type::DOUBLE;
1309 return TypeD::make( sqrt( d ) );
1310 }
1312 //=============================================================================
1313 //------------------------------Value------------------------------------------
1314 // Compute cos
1315 const Type *CosDNode::Value( PhaseTransform *phase ) const {
1316 const Type *t1 = phase->type( in(1) );
1317 if( t1 == Type::TOP ) return Type::TOP;
1318 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1319 double d = t1->getd();
1320 return TypeD::make( StubRoutines::intrinsic_cos( d ) );
1321 }
1323 //=============================================================================
1324 //------------------------------Value------------------------------------------
1325 // Compute sin
1326 const Type *SinDNode::Value( PhaseTransform *phase ) const {
1327 const Type *t1 = phase->type( in(1) );
1328 if( t1 == Type::TOP ) return Type::TOP;
1329 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1330 double d = t1->getd();
1331 return TypeD::make( StubRoutines::intrinsic_sin( d ) );
1332 }
1334 //=============================================================================
1335 //------------------------------Value------------------------------------------
1336 // Compute tan
1337 const Type *TanDNode::Value( PhaseTransform *phase ) const {
1338 const Type *t1 = phase->type( in(1) );
1339 if( t1 == Type::TOP ) return Type::TOP;
1340 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1341 double d = t1->getd();
1342 return TypeD::make( StubRoutines::intrinsic_tan( d ) );
1343 }
1345 //=============================================================================
1346 //------------------------------Value------------------------------------------
1347 // Compute log
1348 const Type *LogDNode::Value( PhaseTransform *phase ) const {
1349 const Type *t1 = phase->type( in(1) );
1350 if( t1 == Type::TOP ) return Type::TOP;
1351 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1352 double d = t1->getd();
1353 return TypeD::make( StubRoutines::intrinsic_log( d ) );
1354 }
1356 //=============================================================================
1357 //------------------------------Value------------------------------------------
1358 // Compute log10
1359 const Type *Log10DNode::Value( PhaseTransform *phase ) const {
1360 const Type *t1 = phase->type( in(1) );
1361 if( t1 == Type::TOP ) return Type::TOP;
1362 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1363 double d = t1->getd();
1364 return TypeD::make( StubRoutines::intrinsic_log10( d ) );
1365 }
1367 //=============================================================================
1368 //------------------------------Value------------------------------------------
1369 // Compute exp
1370 const Type *ExpDNode::Value( PhaseTransform *phase ) const {
1371 const Type *t1 = phase->type( in(1) );
1372 if( t1 == Type::TOP ) return Type::TOP;
1373 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1374 double d = t1->getd();
1375 return TypeD::make( StubRoutines::intrinsic_exp( d ) );
1376 }
1379 //=============================================================================
1380 //------------------------------Value------------------------------------------
1381 // Compute pow
1382 const Type *PowDNode::Value( PhaseTransform *phase ) const {
1383 const Type *t1 = phase->type( in(1) );
1384 if( t1 == Type::TOP ) return Type::TOP;
1385 if( t1->base() != Type::DoubleCon ) return Type::DOUBLE;
1386 const Type *t2 = phase->type( in(2) );
1387 if( t2 == Type::TOP ) return Type::TOP;
1388 if( t2->base() != Type::DoubleCon ) return Type::DOUBLE;
1389 double d1 = t1->getd();
1390 double d2 = t2->getd();
1391 return TypeD::make( StubRoutines::intrinsic_pow( d1, d2 ) );
1392 }