Mercurial > hg > graal-jvmci-8
annotate src/share/vm/opto/divnode.cpp @ 131:6e825ad773c6
6695288: runThese tests expr30303 and drem00301m1 fail when compiled code executes without deopt
Summary: rework Value method for ModD and ModF, to DTRT for infinities
Reviewed-by: sgoldman, kvn, rasbold
author | jrose |
---|---|
date | Tue, 29 Apr 2008 19:40:51 -0700 |
parents | a61af66fc99e |
children | f3de1255b035 |
rev | line source |
---|---|
0 | 1 /* |
2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // Portions of code courtesy of Clifford Click | |
26 | |
27 // Optimization - Graph Style | |
28 | |
29 #include "incls/_precompiled.incl" | |
30 #include "incls/_divnode.cpp.incl" | |
31 #include <math.h> | |
32 | |
33 // Implement the integer constant divide -> long multiply transform found in | |
34 // "Division by Invariant Integers using Multiplication" | |
35 // by Granlund and Montgomery | |
36 static Node *transform_int_divide_to_long_multiply( PhaseGVN *phase, Node *dividend, int divisor ) { | |
37 | |
38 // Check for invalid divisors | |
39 assert( divisor != 0 && divisor != min_jint && divisor != 1, | |
40 "bad divisor for transforming to long multiply" ); | |
41 | |
42 // Compute l = ceiling(log2(d)) | |
43 // presumes d is more likely small | |
44 bool d_pos = divisor >= 0; | |
45 int d = d_pos ? divisor : -divisor; | |
46 unsigned ud = (unsigned)d; | |
47 const int N = 32; | |
48 int l = log2_intptr(d-1)+1; | |
49 int sh_post = l; | |
50 | |
51 const uint64_t U1 = (uint64_t)1; | |
52 | |
53 // Cliff pointed out how to prevent overflow (from the paper) | |
54 uint64_t m_low = (((U1 << l) - ud) << N) / ud + (U1 << N); | |
55 uint64_t m_high = ((((U1 << l) - ud) << N) + (U1 << (l+1))) / ud + (U1 << N); | |
56 | |
57 // Reduce to lowest terms | |
58 for ( ; sh_post > 0; sh_post-- ) { | |
59 uint64_t m_low_1 = m_low >> 1; | |
60 uint64_t m_high_1 = m_high >> 1; | |
61 if ( m_low_1 >= m_high_1 ) | |
62 break; | |
63 m_low = m_low_1; | |
64 m_high = m_high_1; | |
65 } | |
66 | |
67 // Result | |
68 Node *q; | |
69 | |
70 // division by +/- 1 | |
71 if (d == 1) { | |
72 // Filtered out as identity above | |
73 if (d_pos) | |
74 return NULL; | |
75 | |
76 // Just negate the value | |
77 else { | |
78 q = new (phase->C, 3) SubINode(phase->intcon(0), dividend); | |
79 } | |
80 } | |
81 | |
82 // division by +/- a power of 2 | |
83 else if ( is_power_of_2(d) ) { | |
84 | |
85 // See if we can simply do a shift without rounding | |
86 bool needs_rounding = true; | |
87 const Type *dt = phase->type(dividend); | |
88 const TypeInt *dti = dt->isa_int(); | |
89 | |
90 // we don't need to round a positive dividend | |
91 if (dti && dti->_lo >= 0) | |
92 needs_rounding = false; | |
93 | |
94 // An AND mask of sufficient size clears the low bits and | |
95 // I can avoid rounding. | |
96 else if( dividend->Opcode() == Op_AndI ) { | |
97 const TypeInt *andconi = phase->type( dividend->in(2) )->isa_int(); | |
98 if( andconi && andconi->is_con(-d) ) { | |
99 dividend = dividend->in(1); | |
100 needs_rounding = false; | |
101 } | |
102 } | |
103 | |
104 // Add rounding to the shift to handle the sign bit | |
105 if( needs_rounding ) { | |
106 Node *t1 = phase->transform(new (phase->C, 3) RShiftINode(dividend, phase->intcon(l - 1))); | |
107 Node *t2 = phase->transform(new (phase->C, 3) URShiftINode(t1, phase->intcon(N - l))); | |
108 dividend = phase->transform(new (phase->C, 3) AddINode(dividend, t2)); | |
109 } | |
110 | |
111 q = new (phase->C, 3) RShiftINode(dividend, phase->intcon(l)); | |
112 | |
113 if (!d_pos) | |
114 q = new (phase->C, 3) SubINode(phase->intcon(0), phase->transform(q)); | |
115 } | |
116 | |
117 // division by something else | |
118 else if (m_high < (U1 << (N-1))) { | |
119 Node *t1 = phase->transform(new (phase->C, 2) ConvI2LNode(dividend)); | |
120 Node *t2 = phase->transform(new (phase->C, 3) MulLNode(t1, phase->longcon(m_high))); | |
121 Node *t3 = phase->transform(new (phase->C, 3) RShiftLNode(t2, phase->intcon(sh_post+N))); | |
122 Node *t4 = phase->transform(new (phase->C, 2) ConvL2INode(t3)); | |
123 Node *t5 = phase->transform(new (phase->C, 3) RShiftINode(dividend, phase->intcon(N-1))); | |
124 | |
125 q = new (phase->C, 3) SubINode(d_pos ? t4 : t5, d_pos ? t5 : t4); | |
126 } | |
127 | |
128 // This handles that case where m_high is >= 2**(N-1). In that case, | |
129 // we subtract out 2**N from the multiply and add it in later as | |
130 // "dividend" in the equation (t5). This case computes the same result | |
131 // as the immediately preceeding case, save that rounding and overflow | |
132 // are accounted for. | |
133 else { | |
134 Node *t1 = phase->transform(new (phase->C, 2) ConvI2LNode(dividend)); | |
135 Node *t2 = phase->transform(new (phase->C, 3) MulLNode(t1, phase->longcon(m_high - (U1 << N)))); | |
136 Node *t3 = phase->transform(new (phase->C, 3) RShiftLNode(t2, phase->intcon(N))); | |
137 Node *t4 = phase->transform(new (phase->C, 2) ConvL2INode(t3)); | |
138 Node *t5 = phase->transform(new (phase->C, 3) AddINode(dividend, t4)); | |
139 Node *t6 = phase->transform(new (phase->C, 3) RShiftINode(t5, phase->intcon(sh_post))); | |
140 Node *t7 = phase->transform(new (phase->C, 3) RShiftINode(dividend, phase->intcon(N-1))); | |
141 | |
142 q = new (phase->C, 3) SubINode(d_pos ? t6 : t7, d_pos ? t7 : t6); | |
143 } | |
144 | |
145 return (q); | |
146 } | |
147 | |
148 //============================================================================= | |
149 //------------------------------Identity--------------------------------------- | |
150 // If the divisor is 1, we are an identity on the dividend. | |
151 Node *DivINode::Identity( PhaseTransform *phase ) { | |
152 return (phase->type( in(2) )->higher_equal(TypeInt::ONE)) ? in(1) : this; | |
153 } | |
154 | |
155 //------------------------------Idealize--------------------------------------- | |
156 // Divides can be changed to multiplies and/or shifts | |
157 Node *DivINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
158 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
159 | |
160 const Type *t = phase->type( in(2) ); | |
161 if( t == TypeInt::ONE ) // Identity? | |
162 return NULL; // Skip it | |
163 | |
164 const TypeInt *ti = t->isa_int(); | |
165 if( !ti ) return NULL; | |
166 if( !ti->is_con() ) return NULL; | |
167 int i = ti->get_con(); // Get divisor | |
168 | |
169 if (i == 0) return NULL; // Dividing by zero constant does not idealize | |
170 | |
171 set_req(0,NULL); // Dividing by a not-zero constant; no faulting | |
172 | |
173 // Dividing by MININT does not optimize as a power-of-2 shift. | |
174 if( i == min_jint ) return NULL; | |
175 | |
176 return transform_int_divide_to_long_multiply( phase, in(1), i ); | |
177 } | |
178 | |
179 //------------------------------Value------------------------------------------ | |
180 // A DivINode divides its inputs. The third input is a Control input, used to | |
181 // prevent hoisting the divide above an unsafe test. | |
182 const Type *DivINode::Value( PhaseTransform *phase ) const { | |
183 // Either input is TOP ==> the result is TOP | |
184 const Type *t1 = phase->type( in(1) ); | |
185 const Type *t2 = phase->type( in(2) ); | |
186 if( t1 == Type::TOP ) return Type::TOP; | |
187 if( t2 == Type::TOP ) return Type::TOP; | |
188 | |
189 // x/x == 1 since we always generate the dynamic divisor check for 0. | |
190 if( phase->eqv( in(1), in(2) ) ) | |
191 return TypeInt::ONE; | |
192 | |
193 // Either input is BOTTOM ==> the result is the local BOTTOM | |
194 const Type *bot = bottom_type(); | |
195 if( (t1 == bot) || (t2 == bot) || | |
196 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
197 return bot; | |
198 | |
199 // Divide the two numbers. We approximate. | |
200 // If divisor is a constant and not zero | |
201 const TypeInt *i1 = t1->is_int(); | |
202 const TypeInt *i2 = t2->is_int(); | |
203 int widen = MAX2(i1->_widen, i2->_widen); | |
204 | |
205 if( i2->is_con() && i2->get_con() != 0 ) { | |
206 int32 d = i2->get_con(); // Divisor | |
207 jint lo, hi; | |
208 if( d >= 0 ) { | |
209 lo = i1->_lo/d; | |
210 hi = i1->_hi/d; | |
211 } else { | |
212 if( d == -1 && i1->_lo == min_jint ) { | |
213 // 'min_jint/-1' throws arithmetic exception during compilation | |
214 lo = min_jint; | |
215 // do not support holes, 'hi' must go to either min_jint or max_jint: | |
216 // [min_jint, -10]/[-1,-1] ==> [min_jint] UNION [10,max_jint] | |
217 hi = i1->_hi == min_jint ? min_jint : max_jint; | |
218 } else { | |
219 lo = i1->_hi/d; | |
220 hi = i1->_lo/d; | |
221 } | |
222 } | |
223 return TypeInt::make(lo, hi, widen); | |
224 } | |
225 | |
226 // If the dividend is a constant | |
227 if( i1->is_con() ) { | |
228 int32 d = i1->get_con(); | |
229 if( d < 0 ) { | |
230 if( d == min_jint ) { | |
231 // (-min_jint) == min_jint == (min_jint / -1) | |
232 return TypeInt::make(min_jint, max_jint/2 + 1, widen); | |
233 } else { | |
234 return TypeInt::make(d, -d, widen); | |
235 } | |
236 } | |
237 return TypeInt::make(-d, d, widen); | |
238 } | |
239 | |
240 // Otherwise we give up all hope | |
241 return TypeInt::INT; | |
242 } | |
243 | |
244 | |
245 //============================================================================= | |
246 //------------------------------Identity--------------------------------------- | |
247 // If the divisor is 1, we are an identity on the dividend. | |
248 Node *DivLNode::Identity( PhaseTransform *phase ) { | |
249 return (phase->type( in(2) )->higher_equal(TypeLong::ONE)) ? in(1) : this; | |
250 } | |
251 | |
252 //------------------------------Idealize--------------------------------------- | |
253 // Dividing by a power of 2 is a shift. | |
254 Node *DivLNode::Ideal( PhaseGVN *phase, bool can_reshape) { | |
255 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
256 | |
257 const Type *t = phase->type( in(2) ); | |
258 if( t == TypeLong::ONE ) // Identity? | |
259 return NULL; // Skip it | |
260 | |
261 const TypeLong *ti = t->isa_long(); | |
262 if( !ti ) return NULL; | |
263 if( !ti->is_con() ) return NULL; | |
264 jlong i = ti->get_con(); // Get divisor | |
265 if( i ) set_req(0, NULL); // Dividing by a not-zero constant; no faulting | |
266 | |
267 // Dividing by MININT does not optimize as a power-of-2 shift. | |
268 if( i == min_jlong ) return NULL; | |
269 | |
270 // Check for negative power of 2 divisor, if so, negate it and set a flag | |
271 // to indicate result needs to be negated. Note that negating the dividend | |
272 // here does not work when it has the value MININT | |
273 Node *dividend = in(1); | |
274 bool negate_res = false; | |
275 if (is_power_of_2_long(-i)) { | |
276 i = -i; // Flip divisor | |
277 negate_res = true; | |
278 } | |
279 | |
280 // Check for power of 2 | |
281 if (!is_power_of_2_long(i)) // Is divisor a power of 2? | |
282 return NULL; // Not a power of 2 | |
283 | |
284 // Compute number of bits to shift | |
285 int log_i = log2_long(i); | |
286 | |
287 // See if we can simply do a shift without rounding | |
288 bool needs_rounding = true; | |
289 const Type *dt = phase->type(dividend); | |
290 const TypeLong *dtl = dt->isa_long(); | |
291 | |
292 if (dtl && dtl->_lo > 0) { | |
293 // we don't need to round a positive dividend | |
294 needs_rounding = false; | |
295 } else if( dividend->Opcode() == Op_AndL ) { | |
296 // An AND mask of sufficient size clears the low bits and | |
297 // I can avoid rounding. | |
298 const TypeLong *andconi = phase->type( dividend->in(2) )->isa_long(); | |
299 if( andconi && | |
300 andconi->is_con() && | |
301 andconi->get_con() == -i ) { | |
302 dividend = dividend->in(1); | |
303 needs_rounding = false; | |
304 } | |
305 } | |
306 | |
307 if (!needs_rounding) { | |
308 Node *result = new (phase->C, 3) RShiftLNode(dividend, phase->intcon(log_i)); | |
309 if (negate_res) { | |
310 result = phase->transform(result); | |
311 result = new (phase->C, 3) SubLNode(phase->longcon(0), result); | |
312 } | |
313 return result; | |
314 } | |
315 | |
316 // Divide-by-power-of-2 can be made into a shift, but you have to do | |
317 // more math for the rounding. You need to add 0 for positive | |
318 // numbers, and "i-1" for negative numbers. Example: i=4, so the | |
319 // shift is by 2. You need to add 3 to negative dividends and 0 to | |
320 // positive ones. So (-7+3)>>2 becomes -1, (-4+3)>>2 becomes -1, | |
321 // (-2+3)>>2 becomes 0, etc. | |
322 | |
323 // Compute 0 or -1, based on sign bit | |
324 Node *sign = phase->transform(new (phase->C, 3) RShiftLNode(dividend,phase->intcon(63))); | |
325 // Mask sign bit to the low sign bits | |
326 Node *round = phase->transform(new (phase->C, 3) AndLNode(sign,phase->longcon(i-1))); | |
327 // Round up before shifting | |
328 Node *sum = phase->transform(new (phase->C, 3) AddLNode(dividend,round)); | |
329 // Shift for division | |
330 Node *result = new (phase->C, 3) RShiftLNode(sum, phase->intcon(log_i)); | |
331 if (negate_res) { | |
332 result = phase->transform(result); | |
333 result = new (phase->C, 3) SubLNode(phase->longcon(0), result); | |
334 } | |
335 | |
336 return result; | |
337 } | |
338 | |
339 //------------------------------Value------------------------------------------ | |
340 // A DivLNode divides its inputs. The third input is a Control input, used to | |
341 // prevent hoisting the divide above an unsafe test. | |
342 const Type *DivLNode::Value( PhaseTransform *phase ) const { | |
343 // Either input is TOP ==> the result is TOP | |
344 const Type *t1 = phase->type( in(1) ); | |
345 const Type *t2 = phase->type( in(2) ); | |
346 if( t1 == Type::TOP ) return Type::TOP; | |
347 if( t2 == Type::TOP ) return Type::TOP; | |
348 | |
349 // x/x == 1 since we always generate the dynamic divisor check for 0. | |
350 if( phase->eqv( in(1), in(2) ) ) | |
351 return TypeLong::ONE; | |
352 | |
353 // Either input is BOTTOM ==> the result is the local BOTTOM | |
354 const Type *bot = bottom_type(); | |
355 if( (t1 == bot) || (t2 == bot) || | |
356 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
357 return bot; | |
358 | |
359 // Divide the two numbers. We approximate. | |
360 // If divisor is a constant and not zero | |
361 const TypeLong *i1 = t1->is_long(); | |
362 const TypeLong *i2 = t2->is_long(); | |
363 int widen = MAX2(i1->_widen, i2->_widen); | |
364 | |
365 if( i2->is_con() && i2->get_con() != 0 ) { | |
366 jlong d = i2->get_con(); // Divisor | |
367 jlong lo, hi; | |
368 if( d >= 0 ) { | |
369 lo = i1->_lo/d; | |
370 hi = i1->_hi/d; | |
371 } else { | |
372 if( d == CONST64(-1) && i1->_lo == min_jlong ) { | |
373 // 'min_jlong/-1' throws arithmetic exception during compilation | |
374 lo = min_jlong; | |
375 // do not support holes, 'hi' must go to either min_jlong or max_jlong: | |
376 // [min_jlong, -10]/[-1,-1] ==> [min_jlong] UNION [10,max_jlong] | |
377 hi = i1->_hi == min_jlong ? min_jlong : max_jlong; | |
378 } else { | |
379 lo = i1->_hi/d; | |
380 hi = i1->_lo/d; | |
381 } | |
382 } | |
383 return TypeLong::make(lo, hi, widen); | |
384 } | |
385 | |
386 // If the dividend is a constant | |
387 if( i1->is_con() ) { | |
388 jlong d = i1->get_con(); | |
389 if( d < 0 ) { | |
390 if( d == min_jlong ) { | |
391 // (-min_jlong) == min_jlong == (min_jlong / -1) | |
392 return TypeLong::make(min_jlong, max_jlong/2 + 1, widen); | |
393 } else { | |
394 return TypeLong::make(d, -d, widen); | |
395 } | |
396 } | |
397 return TypeLong::make(-d, d, widen); | |
398 } | |
399 | |
400 // Otherwise we give up all hope | |
401 return TypeLong::LONG; | |
402 } | |
403 | |
404 | |
405 //============================================================================= | |
406 //------------------------------Value------------------------------------------ | |
407 // An DivFNode divides its inputs. The third input is a Control input, used to | |
408 // prevent hoisting the divide above an unsafe test. | |
409 const Type *DivFNode::Value( PhaseTransform *phase ) const { | |
410 // Either input is TOP ==> the result is TOP | |
411 const Type *t1 = phase->type( in(1) ); | |
412 const Type *t2 = phase->type( in(2) ); | |
413 if( t1 == Type::TOP ) return Type::TOP; | |
414 if( t2 == Type::TOP ) return Type::TOP; | |
415 | |
416 // Either input is BOTTOM ==> the result is the local BOTTOM | |
417 const Type *bot = bottom_type(); | |
418 if( (t1 == bot) || (t2 == bot) || | |
419 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
420 return bot; | |
421 | |
422 // x/x == 1, we ignore 0/0. | |
423 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
131
6e825ad773c6
6695288: runThese tests expr30303 and drem00301m1 fail when compiled code executes without deopt
jrose
parents:
0
diff
changeset
|
424 // Does not work for variables because of NaN's |
0 | 425 if( phase->eqv( in(1), in(2) ) && t1->base() == Type::FloatCon) |
426 if (!g_isnan(t1->getf()) && g_isfinite(t1->getf()) && t1->getf() != 0.0) // could be negative ZERO or NaN | |
427 return TypeF::ONE; | |
428 | |
429 if( t2 == TypeF::ONE ) | |
430 return t1; | |
431 | |
432 // If divisor is a constant and not zero, divide them numbers | |
433 if( t1->base() == Type::FloatCon && | |
434 t2->base() == Type::FloatCon && | |
435 t2->getf() != 0.0 ) // could be negative zero | |
436 return TypeF::make( t1->getf()/t2->getf() ); | |
437 | |
438 // If the dividend is a constant zero | |
439 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
440 // Test TypeF::ZERO is not sufficient as it could be negative zero | |
441 | |
442 if( t1 == TypeF::ZERO && !g_isnan(t2->getf()) && t2->getf() != 0.0 ) | |
443 return TypeF::ZERO; | |
444 | |
445 // Otherwise we give up all hope | |
446 return Type::FLOAT; | |
447 } | |
448 | |
449 //------------------------------isA_Copy--------------------------------------- | |
450 // Dividing by self is 1. | |
451 // If the divisor is 1, we are an identity on the dividend. | |
452 Node *DivFNode::Identity( PhaseTransform *phase ) { | |
453 return (phase->type( in(2) ) == TypeF::ONE) ? in(1) : this; | |
454 } | |
455 | |
456 | |
457 //------------------------------Idealize--------------------------------------- | |
458 Node *DivFNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
459 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
460 | |
461 const Type *t2 = phase->type( in(2) ); | |
462 if( t2 == TypeF::ONE ) // Identity? | |
463 return NULL; // Skip it | |
464 | |
465 const TypeF *tf = t2->isa_float_constant(); | |
466 if( !tf ) return NULL; | |
467 if( tf->base() != Type::FloatCon ) return NULL; | |
468 | |
469 // Check for out of range values | |
470 if( tf->is_nan() || !tf->is_finite() ) return NULL; | |
471 | |
472 // Get the value | |
473 float f = tf->getf(); | |
474 int exp; | |
475 | |
476 // Only for special case of dividing by a power of 2 | |
477 if( frexp((double)f, &exp) != 0.5 ) return NULL; | |
478 | |
479 // Limit the range of acceptable exponents | |
480 if( exp < -126 || exp > 126 ) return NULL; | |
481 | |
482 // Compute the reciprocal | |
483 float reciprocal = ((float)1.0) / f; | |
484 | |
485 assert( frexp((double)reciprocal, &exp) == 0.5, "reciprocal should be power of 2" ); | |
486 | |
487 // return multiplication by the reciprocal | |
488 return (new (phase->C, 3) MulFNode(in(1), phase->makecon(TypeF::make(reciprocal)))); | |
489 } | |
490 | |
491 //============================================================================= | |
492 //------------------------------Value------------------------------------------ | |
493 // An DivDNode divides its inputs. The third input is a Control input, used to | |
131
6e825ad773c6
6695288: runThese tests expr30303 and drem00301m1 fail when compiled code executes without deopt
jrose
parents:
0
diff
changeset
|
494 // prevent hoisting the divide above an unsafe test. |
0 | 495 const Type *DivDNode::Value( PhaseTransform *phase ) const { |
496 // Either input is TOP ==> the result is TOP | |
497 const Type *t1 = phase->type( in(1) ); | |
498 const Type *t2 = phase->type( in(2) ); | |
499 if( t1 == Type::TOP ) return Type::TOP; | |
500 if( t2 == Type::TOP ) return Type::TOP; | |
501 | |
502 // Either input is BOTTOM ==> the result is the local BOTTOM | |
503 const Type *bot = bottom_type(); | |
504 if( (t1 == bot) || (t2 == bot) || | |
505 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
506 return bot; | |
507 | |
508 // x/x == 1, we ignore 0/0. | |
509 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
510 // Does not work for variables because of NaN's | |
511 if( phase->eqv( in(1), in(2) ) && t1->base() == Type::DoubleCon) | |
512 if (!g_isnan(t1->getd()) && g_isfinite(t1->getd()) && t1->getd() != 0.0) // could be negative ZERO or NaN | |
513 return TypeD::ONE; | |
514 | |
515 if( t2 == TypeD::ONE ) | |
516 return t1; | |
517 | |
518 // If divisor is a constant and not zero, divide them numbers | |
519 if( t1->base() == Type::DoubleCon && | |
520 t2->base() == Type::DoubleCon && | |
521 t2->getd() != 0.0 ) // could be negative zero | |
522 return TypeD::make( t1->getd()/t2->getd() ); | |
523 | |
524 // If the dividend is a constant zero | |
525 // Note: if t1 and t2 are zero then result is NaN (JVMS page 213) | |
526 // Test TypeF::ZERO is not sufficient as it could be negative zero | |
527 if( t1 == TypeD::ZERO && !g_isnan(t2->getd()) && t2->getd() != 0.0 ) | |
528 return TypeD::ZERO; | |
529 | |
530 // Otherwise we give up all hope | |
531 return Type::DOUBLE; | |
532 } | |
533 | |
534 | |
535 //------------------------------isA_Copy--------------------------------------- | |
536 // Dividing by self is 1. | |
537 // If the divisor is 1, we are an identity on the dividend. | |
538 Node *DivDNode::Identity( PhaseTransform *phase ) { | |
539 return (phase->type( in(2) ) == TypeD::ONE) ? in(1) : this; | |
540 } | |
541 | |
542 //------------------------------Idealize--------------------------------------- | |
543 Node *DivDNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
544 if (in(0) && remove_dead_region(phase, can_reshape)) return this; | |
545 | |
546 const Type *t2 = phase->type( in(2) ); | |
547 if( t2 == TypeD::ONE ) // Identity? | |
548 return NULL; // Skip it | |
549 | |
550 const TypeD *td = t2->isa_double_constant(); | |
551 if( !td ) return NULL; | |
552 if( td->base() != Type::DoubleCon ) return NULL; | |
553 | |
554 // Check for out of range values | |
555 if( td->is_nan() || !td->is_finite() ) return NULL; | |
556 | |
557 // Get the value | |
558 double d = td->getd(); | |
559 int exp; | |
560 | |
561 // Only for special case of dividing by a power of 2 | |
562 if( frexp(d, &exp) != 0.5 ) return NULL; | |
563 | |
564 // Limit the range of acceptable exponents | |
565 if( exp < -1021 || exp > 1022 ) return NULL; | |
566 | |
567 // Compute the reciprocal | |
568 double reciprocal = 1.0 / d; | |
569 | |
570 assert( frexp(reciprocal, &exp) == 0.5, "reciprocal should be power of 2" ); | |
571 | |
572 // return multiplication by the reciprocal | |
573 return (new (phase->C, 3) MulDNode(in(1), phase->makecon(TypeD::make(reciprocal)))); | |
574 } | |
575 | |
576 //============================================================================= | |
577 //------------------------------Idealize--------------------------------------- | |
578 Node *ModINode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
579 // Check for dead control input | |
580 if( remove_dead_region(phase, can_reshape) ) return this; | |
581 | |
582 // Get the modulus | |
583 const Type *t = phase->type( in(2) ); | |
584 if( t == Type::TOP ) return NULL; | |
585 const TypeInt *ti = t->is_int(); | |
586 | |
587 // Check for useless control input | |
588 // Check for excluding mod-zero case | |
589 if( in(0) && (ti->_hi < 0 || ti->_lo > 0) ) { | |
590 set_req(0, NULL); // Yank control input | |
591 return this; | |
592 } | |
593 | |
594 // See if we are MOD'ing by 2^k or 2^k-1. | |
595 if( !ti->is_con() ) return NULL; | |
596 jint con = ti->get_con(); | |
597 | |
598 Node *hook = new (phase->C, 1) Node(1); | |
599 | |
600 // First, special check for modulo 2^k-1 | |
601 if( con >= 0 && con < max_jint && is_power_of_2(con+1) ) { | |
602 uint k = exact_log2(con+1); // Extract k | |
603 | |
604 // Basic algorithm by David Detlefs. See fastmod_int.java for gory details. | |
605 static int unroll_factor[] = { 999, 999, 29, 14, 9, 7, 5, 4, 4, 3, 3, 2, 2, 2, 2, 2, 1 /*past here we assume 1 forever*/}; | |
606 int trip_count = 1; | |
607 if( k < ARRAY_SIZE(unroll_factor)) trip_count = unroll_factor[k]; | |
608 | |
609 // If the unroll factor is not too large, and if conditional moves are | |
610 // ok, then use this case | |
611 if( trip_count <= 5 && ConditionalMoveLimit != 0 ) { | |
612 Node *x = in(1); // Value being mod'd | |
613 Node *divisor = in(2); // Also is mask | |
614 | |
615 hook->init_req(0, x); // Add a use to x to prevent him from dying | |
616 // Generate code to reduce X rapidly to nearly 2^k-1. | |
617 for( int i = 0; i < trip_count; i++ ) { | |
618 Node *xl = phase->transform( new (phase->C, 3) AndINode(x,divisor) ); | |
619 Node *xh = phase->transform( new (phase->C, 3) RShiftINode(x,phase->intcon(k)) ); // Must be signed | |
620 x = phase->transform( new (phase->C, 3) AddINode(xh,xl) ); | |
621 hook->set_req(0, x); | |
622 } | |
623 | |
624 // Generate sign-fixup code. Was original value positive? | |
625 // int hack_res = (i >= 0) ? divisor : 1; | |
626 Node *cmp1 = phase->transform( new (phase->C, 3) CmpINode( in(1), phase->intcon(0) ) ); | |
627 Node *bol1 = phase->transform( new (phase->C, 2) BoolNode( cmp1, BoolTest::ge ) ); | |
628 Node *cmov1= phase->transform( new (phase->C, 4) CMoveINode(bol1, phase->intcon(1), divisor, TypeInt::POS) ); | |
629 // if( x >= hack_res ) x -= divisor; | |
630 Node *sub = phase->transform( new (phase->C, 3) SubINode( x, divisor ) ); | |
631 Node *cmp2 = phase->transform( new (phase->C, 3) CmpINode( x, cmov1 ) ); | |
632 Node *bol2 = phase->transform( new (phase->C, 2) BoolNode( cmp2, BoolTest::ge ) ); | |
633 // Convention is to not transform the return value of an Ideal | |
634 // since Ideal is expected to return a modified 'this' or a new node. | |
635 Node *cmov2= new (phase->C, 4) CMoveINode(bol2, x, sub, TypeInt::INT); | |
636 // cmov2 is now the mod | |
637 | |
638 // Now remove the bogus extra edges used to keep things alive | |
639 if (can_reshape) { | |
640 phase->is_IterGVN()->remove_dead_node(hook); | |
641 } else { | |
642 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
643 } | |
644 return cmov2; | |
645 } | |
646 } | |
647 | |
648 // Fell thru, the unroll case is not appropriate. Transform the modulo | |
649 // into a long multiply/int multiply/subtract case | |
650 | |
651 // Cannot handle mod 0, and min_jint isn't handled by the transform | |
652 if( con == 0 || con == min_jint ) return NULL; | |
653 | |
654 // Get the absolute value of the constant; at this point, we can use this | |
655 jint pos_con = (con >= 0) ? con : -con; | |
656 | |
657 // integer Mod 1 is always 0 | |
658 if( pos_con == 1 ) return new (phase->C, 1) ConINode(TypeInt::ZERO); | |
659 | |
660 int log2_con = -1; | |
661 | |
662 // If this is a power of two, they maybe we can mask it | |
663 if( is_power_of_2(pos_con) ) { | |
664 log2_con = log2_intptr((intptr_t)pos_con); | |
665 | |
666 const Type *dt = phase->type(in(1)); | |
667 const TypeInt *dti = dt->isa_int(); | |
668 | |
669 // See if this can be masked, if the dividend is non-negative | |
670 if( dti && dti->_lo >= 0 ) | |
671 return ( new (phase->C, 3) AndINode( in(1), phase->intcon( pos_con-1 ) ) ); | |
672 } | |
673 | |
674 // Save in(1) so that it cannot be changed or deleted | |
675 hook->init_req(0, in(1)); | |
676 | |
677 // Divide using the transform from DivI to MulL | |
678 Node *divide = phase->transform( transform_int_divide_to_long_multiply( phase, in(1), pos_con ) ); | |
679 | |
680 // Re-multiply, using a shift if this is a power of two | |
681 Node *mult = NULL; | |
682 | |
683 if( log2_con >= 0 ) | |
684 mult = phase->transform( new (phase->C, 3) LShiftINode( divide, phase->intcon( log2_con ) ) ); | |
685 else | |
686 mult = phase->transform( new (phase->C, 3) MulINode( divide, phase->intcon( pos_con ) ) ); | |
687 | |
688 // Finally, subtract the multiplied divided value from the original | |
689 Node *result = new (phase->C, 3) SubINode( in(1), mult ); | |
690 | |
691 // Now remove the bogus extra edges used to keep things alive | |
692 if (can_reshape) { | |
693 phase->is_IterGVN()->remove_dead_node(hook); | |
694 } else { | |
695 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
696 } | |
697 | |
698 // return the value | |
699 return result; | |
700 } | |
701 | |
702 //------------------------------Value------------------------------------------ | |
703 const Type *ModINode::Value( PhaseTransform *phase ) const { | |
704 // Either input is TOP ==> the result is TOP | |
705 const Type *t1 = phase->type( in(1) ); | |
706 const Type *t2 = phase->type( in(2) ); | |
707 if( t1 == Type::TOP ) return Type::TOP; | |
708 if( t2 == Type::TOP ) return Type::TOP; | |
709 | |
710 // We always generate the dynamic check for 0. | |
711 // 0 MOD X is 0 | |
712 if( t1 == TypeInt::ZERO ) return TypeInt::ZERO; | |
713 // X MOD X is 0 | |
714 if( phase->eqv( in(1), in(2) ) ) return TypeInt::ZERO; | |
715 | |
716 // Either input is BOTTOM ==> the result is the local BOTTOM | |
717 const Type *bot = bottom_type(); | |
718 if( (t1 == bot) || (t2 == bot) || | |
719 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
720 return bot; | |
721 | |
722 const TypeInt *i1 = t1->is_int(); | |
723 const TypeInt *i2 = t2->is_int(); | |
724 if( !i1->is_con() || !i2->is_con() ) { | |
725 if( i1->_lo >= 0 && i2->_lo >= 0 ) | |
726 return TypeInt::POS; | |
727 // If both numbers are not constants, we know little. | |
728 return TypeInt::INT; | |
729 } | |
730 // Mod by zero? Throw exception at runtime! | |
731 if( !i2->get_con() ) return TypeInt::POS; | |
732 | |
733 // We must be modulo'ing 2 float constants. | |
734 // Check for min_jint % '-1', result is defined to be '0'. | |
735 if( i1->get_con() == min_jint && i2->get_con() == -1 ) | |
736 return TypeInt::ZERO; | |
737 | |
738 return TypeInt::make( i1->get_con() % i2->get_con() ); | |
739 } | |
740 | |
741 | |
742 //============================================================================= | |
743 //------------------------------Idealize--------------------------------------- | |
744 Node *ModLNode::Ideal(PhaseGVN *phase, bool can_reshape) { | |
745 // Check for dead control input | |
746 if( remove_dead_region(phase, can_reshape) ) return this; | |
747 | |
748 // Get the modulus | |
749 const Type *t = phase->type( in(2) ); | |
750 if( t == Type::TOP ) return NULL; | |
751 const TypeLong *ti = t->is_long(); | |
752 | |
753 // Check for useless control input | |
754 // Check for excluding mod-zero case | |
755 if( in(0) && (ti->_hi < 0 || ti->_lo > 0) ) { | |
756 set_req(0, NULL); // Yank control input | |
757 return this; | |
758 } | |
759 | |
760 // See if we are MOD'ing by 2^k or 2^k-1. | |
761 if( !ti->is_con() ) return NULL; | |
762 jlong con = ti->get_con(); | |
763 bool m1 = false; | |
764 if( !is_power_of_2_long(con) ) { // Not 2^k | |
765 if( !is_power_of_2_long(con+1) ) // Not 2^k-1? | |
766 return NULL; // No interesting mod hacks | |
767 m1 = true; // Found 2^k-1 | |
768 con++; // Convert to 2^k form | |
769 } | |
770 uint k = log2_long(con); // Extract k | |
771 | |
772 // Expand mod | |
773 if( !m1 ) { // Case 2^k | |
774 } else { // Case 2^k-1 | |
775 // Basic algorithm by David Detlefs. See fastmod_long.java for gory details. | |
776 // Used to help a popular random number generator which does a long-mod | |
777 // of 2^31-1 and shows up in SpecJBB and SciMark. | |
778 static int unroll_factor[] = { 999, 999, 61, 30, 20, 15, 12, 10, 8, 7, 6, 6, 5, 5, 4, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1 /*past here we assume 1 forever*/}; | |
779 int trip_count = 1; | |
780 if( k < ARRAY_SIZE(unroll_factor)) trip_count = unroll_factor[k]; | |
781 if( trip_count > 4 ) return NULL; // Too much unrolling | |
782 if (ConditionalMoveLimit == 0) return NULL; // cmov is required | |
783 | |
784 Node *x = in(1); // Value being mod'd | |
785 Node *divisor = in(2); // Also is mask | |
786 | |
787 Node *hook = new (phase->C, 1) Node(x); | |
788 // Generate code to reduce X rapidly to nearly 2^k-1. | |
789 for( int i = 0; i < trip_count; i++ ) { | |
790 Node *xl = phase->transform( new (phase->C, 3) AndLNode(x,divisor) ); | |
791 Node *xh = phase->transform( new (phase->C, 3) RShiftLNode(x,phase->intcon(k)) ); // Must be signed | |
792 x = phase->transform( new (phase->C, 3) AddLNode(xh,xl) ); | |
793 hook->set_req(0, x); // Add a use to x to prevent him from dying | |
794 } | |
795 // Generate sign-fixup code. Was original value positive? | |
796 // long hack_res = (i >= 0) ? divisor : CONST64(1); | |
797 Node *cmp1 = phase->transform( new (phase->C, 3) CmpLNode( in(1), phase->longcon(0) ) ); | |
798 Node *bol1 = phase->transform( new (phase->C, 2) BoolNode( cmp1, BoolTest::ge ) ); | |
799 Node *cmov1= phase->transform( new (phase->C, 4) CMoveLNode(bol1, phase->longcon(1), divisor, TypeLong::LONG) ); | |
800 // if( x >= hack_res ) x -= divisor; | |
801 Node *sub = phase->transform( new (phase->C, 3) SubLNode( x, divisor ) ); | |
802 Node *cmp2 = phase->transform( new (phase->C, 3) CmpLNode( x, cmov1 ) ); | |
803 Node *bol2 = phase->transform( new (phase->C, 2) BoolNode( cmp2, BoolTest::ge ) ); | |
804 // Convention is to not transform the return value of an Ideal | |
805 // since Ideal is expected to return a modified 'this' or a new node. | |
806 Node *cmov2= new (phase->C, 4) CMoveLNode(bol2, x, sub, TypeLong::LONG); | |
807 // cmov2 is now the mod | |
808 | |
809 // Now remove the bogus extra edges used to keep things alive | |
810 if (can_reshape) { | |
811 phase->is_IterGVN()->remove_dead_node(hook); | |
812 } else { | |
813 hook->set_req(0, NULL); // Just yank bogus edge during Parse phase | |
814 } | |
815 return cmov2; | |
816 } | |
817 return NULL; | |
818 } | |
819 | |
820 //------------------------------Value------------------------------------------ | |
821 const Type *ModLNode::Value( PhaseTransform *phase ) const { | |
822 // Either input is TOP ==> the result is TOP | |
823 const Type *t1 = phase->type( in(1) ); | |
824 const Type *t2 = phase->type( in(2) ); | |
825 if( t1 == Type::TOP ) return Type::TOP; | |
826 if( t2 == Type::TOP ) return Type::TOP; | |
827 | |
828 // We always generate the dynamic check for 0. | |
829 // 0 MOD X is 0 | |
830 if( t1 == TypeLong::ZERO ) return TypeLong::ZERO; | |
831 // X MOD X is 0 | |
832 if( phase->eqv( in(1), in(2) ) ) return TypeLong::ZERO; | |
833 | |
834 // Either input is BOTTOM ==> the result is the local BOTTOM | |
835 const Type *bot = bottom_type(); | |
836 if( (t1 == bot) || (t2 == bot) || | |
837 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
838 return bot; | |
839 | |
840 const TypeLong *i1 = t1->is_long(); | |
841 const TypeLong *i2 = t2->is_long(); | |
842 if( !i1->is_con() || !i2->is_con() ) { | |
843 if( i1->_lo >= CONST64(0) && i2->_lo >= CONST64(0) ) | |
844 return TypeLong::POS; | |
845 // If both numbers are not constants, we know little. | |
846 return TypeLong::LONG; | |
847 } | |
848 // Mod by zero? Throw exception at runtime! | |
849 if( !i2->get_con() ) return TypeLong::POS; | |
850 | |
851 // We must be modulo'ing 2 float constants. | |
852 // Check for min_jint % '-1', result is defined to be '0'. | |
853 if( i1->get_con() == min_jlong && i2->get_con() == -1 ) | |
854 return TypeLong::ZERO; | |
855 | |
856 return TypeLong::make( i1->get_con() % i2->get_con() ); | |
857 } | |
858 | |
859 | |
860 //============================================================================= | |
861 //------------------------------Value------------------------------------------ | |
862 const Type *ModFNode::Value( PhaseTransform *phase ) const { | |
863 // Either input is TOP ==> the result is TOP | |
864 const Type *t1 = phase->type( in(1) ); | |
865 const Type *t2 = phase->type( in(2) ); | |
866 if( t1 == Type::TOP ) return Type::TOP; | |
867 if( t2 == Type::TOP ) return Type::TOP; | |
868 | |
869 // Either input is BOTTOM ==> the result is the local BOTTOM | |
870 const Type *bot = bottom_type(); | |
871 if( (t1 == bot) || (t2 == bot) || | |
872 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
873 return bot; | |
874 | |
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875 // If either number is not a constant, we know nothing. |
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876 if ((t1->base() != Type::FloatCon) || (t2->base() != Type::FloatCon)) { |
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877 return Type::FLOAT; // note: x%x can be either NaN or 0 |
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878 } |
0 | 879 |
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880 float f1 = t1->getf(); |
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881 float f2 = t2->getf(); |
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882 jint x1 = jint_cast(f1); // note: *(int*)&f1, not just (int)f1 |
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883 jint x2 = jint_cast(f2); |
0 | 884 |
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885 // If either is a NaN, return an input NaN |
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886 if (g_isnan(f1)) return t1; |
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887 if (g_isnan(f2)) return t2; |
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888 |
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889 // If an operand is infinity or the divisor is +/- zero, punt. |
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890 if (!g_isfinite(f1) || !g_isfinite(f2) || x2 == 0 || x2 == min_jint) |
0 | 891 return Type::FLOAT; |
892 | |
893 // We must be modulo'ing 2 float constants. | |
894 // Make sure that the sign of the fmod is equal to the sign of the dividend | |
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895 jint xr = jint_cast(fmod(f1, f2)); |
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896 if ((x1 ^ xr) < 0) { |
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897 xr ^= min_jint; |
0 | 898 } |
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899 |
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900 return TypeF::make(jfloat_cast(xr)); |
0 | 901 } |
902 | |
903 | |
904 //============================================================================= | |
905 //------------------------------Value------------------------------------------ | |
906 const Type *ModDNode::Value( PhaseTransform *phase ) const { | |
907 // Either input is TOP ==> the result is TOP | |
908 const Type *t1 = phase->type( in(1) ); | |
909 const Type *t2 = phase->type( in(2) ); | |
910 if( t1 == Type::TOP ) return Type::TOP; | |
911 if( t2 == Type::TOP ) return Type::TOP; | |
912 | |
913 // Either input is BOTTOM ==> the result is the local BOTTOM | |
914 const Type *bot = bottom_type(); | |
915 if( (t1 == bot) || (t2 == bot) || | |
916 (t1 == Type::BOTTOM) || (t2 == Type::BOTTOM) ) | |
917 return bot; | |
918 | |
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919 // If either number is not a constant, we know nothing. |
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920 if ((t1->base() != Type::DoubleCon) || (t2->base() != Type::DoubleCon)) { |
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921 return Type::DOUBLE; // note: x%x can be either NaN or 0 |
0 | 922 } |
923 | |
131
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924 double f1 = t1->getd(); |
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925 double f2 = t2->getd(); |
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926 jlong x1 = jlong_cast(f1); // note: *(long*)&f1, not just (long)f1 |
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927 jlong x2 = jlong_cast(f2); |
0 | 928 |
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929 // If either is a NaN, return an input NaN |
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930 if (g_isnan(f1)) return t1; |
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931 if (g_isnan(f2)) return t2; |
0 | 932 |
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933 // If an operand is infinity or the divisor is +/- zero, punt. |
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934 if (!g_isfinite(f1) || !g_isfinite(f2) || x2 == 0 || x2 == min_jlong) |
0 | 935 return Type::DOUBLE; |
936 | |
937 // We must be modulo'ing 2 double constants. | |
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938 // Make sure that the sign of the fmod is equal to the sign of the dividend |
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939 jlong xr = jlong_cast(fmod(f1, f2)); |
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940 if ((x1 ^ xr) < 0) { |
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941 xr ^= min_jlong; |
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942 } |
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943 |
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944 return TypeD::make(jdouble_cast(xr)); |
0 | 945 } |
946 | |
947 //============================================================================= | |
948 | |
949 DivModNode::DivModNode( Node *c, Node *dividend, Node *divisor ) : MultiNode(3) { | |
950 init_req(0, c); | |
951 init_req(1, dividend); | |
952 init_req(2, divisor); | |
953 } | |
954 | |
955 //------------------------------make------------------------------------------ | |
956 DivModINode* DivModINode::make(Compile* C, Node* div_or_mod) { | |
957 Node* n = div_or_mod; | |
958 assert(n->Opcode() == Op_DivI || n->Opcode() == Op_ModI, | |
959 "only div or mod input pattern accepted"); | |
960 | |
961 DivModINode* divmod = new (C, 3) DivModINode(n->in(0), n->in(1), n->in(2)); | |
962 Node* dproj = new (C, 1) ProjNode(divmod, DivModNode::div_proj_num); | |
963 Node* mproj = new (C, 1) ProjNode(divmod, DivModNode::mod_proj_num); | |
964 return divmod; | |
965 } | |
966 | |
967 //------------------------------make------------------------------------------ | |
968 DivModLNode* DivModLNode::make(Compile* C, Node* div_or_mod) { | |
969 Node* n = div_or_mod; | |
970 assert(n->Opcode() == Op_DivL || n->Opcode() == Op_ModL, | |
971 "only div or mod input pattern accepted"); | |
972 | |
973 DivModLNode* divmod = new (C, 3) DivModLNode(n->in(0), n->in(1), n->in(2)); | |
974 Node* dproj = new (C, 1) ProjNode(divmod, DivModNode::div_proj_num); | |
975 Node* mproj = new (C, 1) ProjNode(divmod, DivModNode::mod_proj_num); | |
976 return divmod; | |
977 } | |
978 | |
979 //------------------------------match------------------------------------------ | |
980 // return result(s) along with their RegMask info | |
981 Node *DivModINode::match( const ProjNode *proj, const Matcher *match ) { | |
982 uint ideal_reg = proj->ideal_reg(); | |
983 RegMask rm; | |
984 if (proj->_con == div_proj_num) { | |
985 rm = match->divI_proj_mask(); | |
986 } else { | |
987 assert(proj->_con == mod_proj_num, "must be div or mod projection"); | |
988 rm = match->modI_proj_mask(); | |
989 } | |
990 return new (match->C, 1)MachProjNode(this, proj->_con, rm, ideal_reg); | |
991 } | |
992 | |
993 | |
994 //------------------------------match------------------------------------------ | |
995 // return result(s) along with their RegMask info | |
996 Node *DivModLNode::match( const ProjNode *proj, const Matcher *match ) { | |
997 uint ideal_reg = proj->ideal_reg(); | |
998 RegMask rm; | |
999 if (proj->_con == div_proj_num) { | |
1000 rm = match->divL_proj_mask(); | |
1001 } else { | |
1002 assert(proj->_con == mod_proj_num, "must be div or mod projection"); | |
1003 rm = match->modL_proj_mask(); | |
1004 } | |
1005 return new (match->C, 1)MachProjNode(this, proj->_con, rm, ideal_reg); | |
1006 } |