1 | /* |
---|
2 | * DoubleFloat.java |
---|
3 | * |
---|
4 | * Copyright (C) 2003-2007 Peter Graves |
---|
5 | * $Id: DoubleFloat.java 14062 2012-08-06 19:02:32Z rschlatte $ |
---|
6 | * |
---|
7 | * This program is free software; you can redistribute it and/or |
---|
8 | * modify it under the terms of the GNU General Public License |
---|
9 | * as published by the Free Software Foundation; either version 2 |
---|
10 | * of the License, or (at your option) any later version. |
---|
11 | * |
---|
12 | * This program is distributed in the hope that it will be useful, |
---|
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
---|
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
---|
15 | * GNU General Public License for more details. |
---|
16 | * |
---|
17 | * You should have received a copy of the GNU General Public License |
---|
18 | * along with this program; if not, write to the Free Software |
---|
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
---|
20 | * |
---|
21 | * As a special exception, the copyright holders of this library give you |
---|
22 | * permission to link this library with independent modules to produce an |
---|
23 | * executable, regardless of the license terms of these independent |
---|
24 | * modules, and to copy and distribute the resulting executable under |
---|
25 | * terms of your choice, provided that you also meet, for each linked |
---|
26 | * independent module, the terms and conditions of the license of that |
---|
27 | * module. An independent module is a module which is not derived from |
---|
28 | * or based on this library. If you modify this library, you may extend |
---|
29 | * this exception to your version of the library, but you are not |
---|
30 | * obligated to do so. If you do not wish to do so, delete this |
---|
31 | * exception statement from your version. |
---|
32 | */ |
---|
33 | |
---|
34 | package org.armedbear.lisp; |
---|
35 | |
---|
36 | import static org.armedbear.lisp.Lisp.*; |
---|
37 | |
---|
38 | import java.math.BigInteger; |
---|
39 | |
---|
40 | public final class DoubleFloat extends LispObject |
---|
41 | { |
---|
42 | public static final DoubleFloat ZERO = new DoubleFloat(0); |
---|
43 | public static final DoubleFloat MINUS_ZERO = new DoubleFloat(-0.0d); |
---|
44 | public static final DoubleFloat ONE = new DoubleFloat(1); |
---|
45 | public static final DoubleFloat MINUS_ONE = new DoubleFloat(-1); |
---|
46 | |
---|
47 | public static final DoubleFloat DOUBLE_FLOAT_POSITIVE_INFINITY = |
---|
48 | new DoubleFloat(Double.POSITIVE_INFINITY); |
---|
49 | |
---|
50 | public static final DoubleFloat DOUBLE_FLOAT_NEGATIVE_INFINITY = |
---|
51 | new DoubleFloat(Double.NEGATIVE_INFINITY); |
---|
52 | |
---|
53 | static { |
---|
54 | Symbol.DOUBLE_FLOAT_POSITIVE_INFINITY.initializeConstant(DOUBLE_FLOAT_POSITIVE_INFINITY); |
---|
55 | Symbol.DOUBLE_FLOAT_NEGATIVE_INFINITY.initializeConstant(DOUBLE_FLOAT_NEGATIVE_INFINITY); |
---|
56 | } |
---|
57 | |
---|
58 | public static DoubleFloat getInstance(double d) { |
---|
59 | if (d == 0) { |
---|
60 | long bits = Double.doubleToRawLongBits(d); |
---|
61 | if (bits < 0) |
---|
62 | return MINUS_ZERO; |
---|
63 | else |
---|
64 | return ZERO; |
---|
65 | } |
---|
66 | else if (d == 1) |
---|
67 | return ONE; |
---|
68 | else if (d == -1) |
---|
69 | return MINUS_ONE; |
---|
70 | else |
---|
71 | return new DoubleFloat(d); |
---|
72 | } |
---|
73 | |
---|
74 | public final double value; |
---|
75 | |
---|
76 | public DoubleFloat(double value) |
---|
77 | { |
---|
78 | this.value = value; |
---|
79 | } |
---|
80 | |
---|
81 | @Override |
---|
82 | public LispObject typeOf() |
---|
83 | { |
---|
84 | return Symbol.DOUBLE_FLOAT; |
---|
85 | } |
---|
86 | |
---|
87 | @Override |
---|
88 | public LispObject classOf() |
---|
89 | { |
---|
90 | return BuiltInClass.DOUBLE_FLOAT; |
---|
91 | } |
---|
92 | |
---|
93 | @Override |
---|
94 | public LispObject typep(LispObject typeSpecifier) |
---|
95 | { |
---|
96 | if (typeSpecifier == Symbol.FLOAT) |
---|
97 | return T; |
---|
98 | if (typeSpecifier == Symbol.REAL) |
---|
99 | return T; |
---|
100 | if (typeSpecifier == Symbol.NUMBER) |
---|
101 | return T; |
---|
102 | if (typeSpecifier == Symbol.DOUBLE_FLOAT) |
---|
103 | return T; |
---|
104 | if (typeSpecifier == Symbol.LONG_FLOAT) |
---|
105 | return T; |
---|
106 | if (typeSpecifier == BuiltInClass.FLOAT) |
---|
107 | return T; |
---|
108 | if (typeSpecifier == BuiltInClass.DOUBLE_FLOAT) |
---|
109 | return T; |
---|
110 | return super.typep(typeSpecifier); |
---|
111 | } |
---|
112 | |
---|
113 | @Override |
---|
114 | public boolean numberp() |
---|
115 | { |
---|
116 | return true; |
---|
117 | } |
---|
118 | |
---|
119 | @Override |
---|
120 | public boolean realp() |
---|
121 | { |
---|
122 | return true; |
---|
123 | } |
---|
124 | |
---|
125 | @Override |
---|
126 | public boolean eql(LispObject obj) |
---|
127 | { |
---|
128 | if (this == obj) |
---|
129 | return true; |
---|
130 | if (obj instanceof DoubleFloat) { |
---|
131 | if (value == 0) { |
---|
132 | // "If an implementation supports positive and negative zeros |
---|
133 | // as distinct values, then (EQL 0.0 -0.0) returns false." |
---|
134 | double d = ((DoubleFloat)obj).value; |
---|
135 | long bits = Double.doubleToRawLongBits(d); |
---|
136 | return bits == Double.doubleToRawLongBits(value); |
---|
137 | } |
---|
138 | if (value == ((DoubleFloat)obj).value) |
---|
139 | return true; |
---|
140 | } |
---|
141 | return false; |
---|
142 | } |
---|
143 | |
---|
144 | @Override |
---|
145 | public boolean equal(LispObject obj) |
---|
146 | { |
---|
147 | if (this == obj) |
---|
148 | return true; |
---|
149 | if (obj instanceof DoubleFloat) { |
---|
150 | if (value == 0) { |
---|
151 | // same as EQL |
---|
152 | double d = ((DoubleFloat)obj).value; |
---|
153 | long bits = Double.doubleToRawLongBits(d); |
---|
154 | return bits == Double.doubleToRawLongBits(value); |
---|
155 | } |
---|
156 | if (value == ((DoubleFloat)obj).value) |
---|
157 | return true; |
---|
158 | } |
---|
159 | return false; |
---|
160 | } |
---|
161 | |
---|
162 | @Override |
---|
163 | public boolean equalp(int n) |
---|
164 | { |
---|
165 | // "If two numbers are the same under =." |
---|
166 | return value == n; |
---|
167 | } |
---|
168 | |
---|
169 | @Override |
---|
170 | public boolean equalp(LispObject obj) |
---|
171 | { |
---|
172 | if (obj instanceof SingleFloat) |
---|
173 | return value == ((SingleFloat)obj).value; |
---|
174 | if (obj instanceof DoubleFloat) |
---|
175 | return value == ((DoubleFloat)obj).value; |
---|
176 | if (obj instanceof Fixnum) |
---|
177 | return value == ((Fixnum)obj).value; |
---|
178 | if (obj instanceof Bignum) |
---|
179 | return value == ((Bignum)obj).doubleValue(); |
---|
180 | if (obj instanceof Ratio) |
---|
181 | return value == ((Ratio)obj).doubleValue(); |
---|
182 | return false; |
---|
183 | } |
---|
184 | |
---|
185 | @Override |
---|
186 | public LispObject ABS() |
---|
187 | { |
---|
188 | if (value > 0) |
---|
189 | return this; |
---|
190 | if (value == 0) // 0.0 or -0.0 |
---|
191 | return ZERO; |
---|
192 | return new DoubleFloat(- value); |
---|
193 | } |
---|
194 | |
---|
195 | @Override |
---|
196 | public boolean plusp() |
---|
197 | { |
---|
198 | return value > 0; |
---|
199 | } |
---|
200 | |
---|
201 | @Override |
---|
202 | public boolean minusp() |
---|
203 | { |
---|
204 | return value < 0; |
---|
205 | } |
---|
206 | |
---|
207 | @Override |
---|
208 | public boolean zerop() |
---|
209 | { |
---|
210 | return value == 0; |
---|
211 | } |
---|
212 | |
---|
213 | @Override |
---|
214 | public boolean floatp() |
---|
215 | { |
---|
216 | return true; |
---|
217 | } |
---|
218 | |
---|
219 | public static double getValue(LispObject obj) |
---|
220 | { |
---|
221 | if (obj instanceof DoubleFloat) |
---|
222 | return ((DoubleFloat)obj).value; |
---|
223 | type_error(obj, Symbol.FLOAT); |
---|
224 | // Not reached. |
---|
225 | return 0; |
---|
226 | } |
---|
227 | |
---|
228 | public final double getValue() |
---|
229 | { |
---|
230 | return value; |
---|
231 | } |
---|
232 | |
---|
233 | @Override |
---|
234 | public double doubleValue() { |
---|
235 | return value; |
---|
236 | } |
---|
237 | |
---|
238 | @Override |
---|
239 | public Object javaInstance() |
---|
240 | { |
---|
241 | return Double.valueOf(value); |
---|
242 | } |
---|
243 | |
---|
244 | @Override |
---|
245 | public Object javaInstance(Class c) |
---|
246 | { |
---|
247 | String cn = c.getName(); |
---|
248 | if (cn.equals("java.lang.Float") || cn.equals("float")) |
---|
249 | return Float.valueOf((float)value); |
---|
250 | return javaInstance(); |
---|
251 | } |
---|
252 | |
---|
253 | @Override |
---|
254 | public final LispObject incr() |
---|
255 | { |
---|
256 | return new DoubleFloat(value + 1); |
---|
257 | } |
---|
258 | |
---|
259 | @Override |
---|
260 | public final LispObject decr() |
---|
261 | { |
---|
262 | return new DoubleFloat(value - 1); |
---|
263 | } |
---|
264 | |
---|
265 | @Override |
---|
266 | public LispObject negate() |
---|
267 | { |
---|
268 | if (value == 0) { |
---|
269 | long bits = Double.doubleToRawLongBits(value); |
---|
270 | return (bits < 0) ? ZERO : MINUS_ZERO; |
---|
271 | } |
---|
272 | return new DoubleFloat(-value); |
---|
273 | } |
---|
274 | |
---|
275 | @Override |
---|
276 | public LispObject add(LispObject obj) |
---|
277 | { |
---|
278 | if (obj instanceof Fixnum) |
---|
279 | return new DoubleFloat(value + ((Fixnum)obj).value); |
---|
280 | if (obj instanceof SingleFloat) |
---|
281 | return new DoubleFloat(value + ((SingleFloat)obj).value); |
---|
282 | if (obj instanceof DoubleFloat) |
---|
283 | return new DoubleFloat(value + ((DoubleFloat)obj).value); |
---|
284 | if (obj instanceof Bignum) |
---|
285 | return new DoubleFloat(value + ((Bignum)obj).doubleValue()); |
---|
286 | if (obj instanceof Ratio) |
---|
287 | return new DoubleFloat(value + ((Ratio)obj).doubleValue()); |
---|
288 | if (obj instanceof Complex) { |
---|
289 | Complex c = (Complex) obj; |
---|
290 | return Complex.getInstance(add(c.getRealPart()), c.getImaginaryPart()); |
---|
291 | } |
---|
292 | return type_error(obj, Symbol.NUMBER); |
---|
293 | } |
---|
294 | |
---|
295 | @Override |
---|
296 | public LispObject subtract(LispObject obj) |
---|
297 | { |
---|
298 | if (obj instanceof Fixnum) |
---|
299 | return new DoubleFloat(value - ((Fixnum)obj).value); |
---|
300 | if (obj instanceof SingleFloat) |
---|
301 | return new DoubleFloat(value - ((SingleFloat)obj).value); |
---|
302 | if (obj instanceof DoubleFloat) |
---|
303 | return new DoubleFloat(value - ((DoubleFloat)obj).value); |
---|
304 | if (obj instanceof Bignum) |
---|
305 | return new DoubleFloat(value - ((Bignum)obj).doubleValue()); |
---|
306 | if (obj instanceof Ratio) |
---|
307 | return new DoubleFloat(value - ((Ratio)obj).doubleValue()); |
---|
308 | if (obj instanceof Complex) { |
---|
309 | Complex c = (Complex) obj; |
---|
310 | return Complex.getInstance(subtract(c.getRealPart()), |
---|
311 | ZERO.subtract(c.getImaginaryPart())); |
---|
312 | } |
---|
313 | return type_error(obj, Symbol.NUMBER); |
---|
314 | } |
---|
315 | |
---|
316 | @Override |
---|
317 | public LispObject multiplyBy(LispObject obj) |
---|
318 | { |
---|
319 | if (obj instanceof Fixnum) |
---|
320 | return new DoubleFloat(value * ((Fixnum)obj).value); |
---|
321 | if (obj instanceof SingleFloat) |
---|
322 | return new DoubleFloat(value * ((SingleFloat)obj).value); |
---|
323 | if (obj instanceof DoubleFloat) |
---|
324 | return new DoubleFloat(value * ((DoubleFloat)obj).value); |
---|
325 | if (obj instanceof Bignum) |
---|
326 | return new DoubleFloat(value * ((Bignum)obj).doubleValue()); |
---|
327 | if (obj instanceof Ratio) |
---|
328 | return new DoubleFloat(value * ((Ratio)obj).doubleValue()); |
---|
329 | if (obj instanceof Complex) { |
---|
330 | Complex c = (Complex) obj; |
---|
331 | return Complex.getInstance(multiplyBy(c.getRealPart()), |
---|
332 | multiplyBy(c.getImaginaryPart())); |
---|
333 | } |
---|
334 | return type_error(obj, Symbol.NUMBER); |
---|
335 | } |
---|
336 | |
---|
337 | @Override |
---|
338 | public LispObject divideBy(LispObject obj) |
---|
339 | { |
---|
340 | if (obj instanceof Fixnum) |
---|
341 | return new DoubleFloat(value / ((Fixnum)obj).value); |
---|
342 | if (obj instanceof SingleFloat) |
---|
343 | return new DoubleFloat(value / ((SingleFloat)obj).value); |
---|
344 | if (obj instanceof DoubleFloat) |
---|
345 | return new DoubleFloat(value / ((DoubleFloat)obj).value); |
---|
346 | if (obj instanceof Bignum) |
---|
347 | return new DoubleFloat(value / ((Bignum)obj).doubleValue()); |
---|
348 | if (obj instanceof Ratio) |
---|
349 | return new DoubleFloat(value / ((Ratio)obj).doubleValue()); |
---|
350 | if (obj instanceof Complex) { |
---|
351 | Complex c = (Complex) obj; |
---|
352 | LispObject re = c.getRealPart(); |
---|
353 | LispObject im = c.getImaginaryPart(); |
---|
354 | LispObject denom = re.multiplyBy(re).add(im.multiplyBy(im)); |
---|
355 | LispObject resX = multiplyBy(re).divideBy(denom); |
---|
356 | LispObject resY = |
---|
357 | multiplyBy(Fixnum.MINUS_ONE).multiplyBy(im).divideBy(denom); |
---|
358 | return Complex.getInstance(resX, resY); |
---|
359 | } |
---|
360 | return type_error(obj, Symbol.NUMBER); |
---|
361 | } |
---|
362 | |
---|
363 | @Override |
---|
364 | public boolean isEqualTo(LispObject obj) |
---|
365 | { |
---|
366 | if (obj instanceof Fixnum) |
---|
367 | return value == ((Fixnum)obj).value; |
---|
368 | if (obj instanceof SingleFloat) |
---|
369 | return value == ((SingleFloat)obj).value; |
---|
370 | if (obj instanceof DoubleFloat) |
---|
371 | return value == ((DoubleFloat)obj).value; |
---|
372 | if (obj instanceof Bignum) |
---|
373 | return rational().isEqualTo(obj); |
---|
374 | if (obj instanceof Ratio) |
---|
375 | return rational().isEqualTo(obj); |
---|
376 | if (obj instanceof Complex) |
---|
377 | return obj.isEqualTo(this); |
---|
378 | type_error(obj, Symbol.NUMBER); |
---|
379 | // Not reached. |
---|
380 | return false; |
---|
381 | } |
---|
382 | |
---|
383 | @Override |
---|
384 | public boolean isNotEqualTo(LispObject obj) |
---|
385 | { |
---|
386 | return !isEqualTo(obj); |
---|
387 | } |
---|
388 | |
---|
389 | @Override |
---|
390 | public boolean isLessThan(LispObject obj) |
---|
391 | { |
---|
392 | if (obj instanceof Fixnum) |
---|
393 | return value < ((Fixnum)obj).value; |
---|
394 | if (obj instanceof SingleFloat) |
---|
395 | return value < ((SingleFloat)obj).value; |
---|
396 | if (obj instanceof DoubleFloat) |
---|
397 | return value < ((DoubleFloat)obj).value; |
---|
398 | if (obj instanceof Bignum) |
---|
399 | return rational().isLessThan(obj); |
---|
400 | if (obj instanceof Ratio) |
---|
401 | return rational().isLessThan(obj); |
---|
402 | type_error(obj, Symbol.REAL); |
---|
403 | // Not reached. |
---|
404 | return false; |
---|
405 | } |
---|
406 | |
---|
407 | @Override |
---|
408 | public boolean isGreaterThan(LispObject obj) |
---|
409 | { |
---|
410 | if (obj instanceof Fixnum) |
---|
411 | return value > ((Fixnum)obj).value; |
---|
412 | if (obj instanceof SingleFloat) |
---|
413 | return value > ((SingleFloat)obj).value; |
---|
414 | if (obj instanceof DoubleFloat) |
---|
415 | return value > ((DoubleFloat)obj).value; |
---|
416 | if (obj instanceof Bignum) |
---|
417 | return rational().isGreaterThan(obj); |
---|
418 | if (obj instanceof Ratio) |
---|
419 | return rational().isGreaterThan(obj); |
---|
420 | type_error(obj, Symbol.REAL); |
---|
421 | // Not reached. |
---|
422 | return false; |
---|
423 | } |
---|
424 | |
---|
425 | @Override |
---|
426 | public boolean isLessThanOrEqualTo(LispObject obj) |
---|
427 | { |
---|
428 | if (obj instanceof Fixnum) |
---|
429 | return value <= ((Fixnum)obj).value; |
---|
430 | if (obj instanceof SingleFloat) |
---|
431 | return value <= ((SingleFloat)obj).value; |
---|
432 | if (obj instanceof DoubleFloat) |
---|
433 | return value <= ((DoubleFloat)obj).value; |
---|
434 | if (obj instanceof Bignum) |
---|
435 | return rational().isLessThanOrEqualTo(obj); |
---|
436 | if (obj instanceof Ratio) |
---|
437 | return rational().isLessThanOrEqualTo(obj); |
---|
438 | type_error(obj, Symbol.REAL); |
---|
439 | // Not reached. |
---|
440 | return false; |
---|
441 | } |
---|
442 | |
---|
443 | @Override |
---|
444 | public boolean isGreaterThanOrEqualTo(LispObject obj) |
---|
445 | { |
---|
446 | if (obj instanceof Fixnum) |
---|
447 | return value >= ((Fixnum)obj).value; |
---|
448 | if (obj instanceof SingleFloat) |
---|
449 | return value >= ((SingleFloat)obj).value; |
---|
450 | if (obj instanceof DoubleFloat) |
---|
451 | return value >= ((DoubleFloat)obj).value; |
---|
452 | if (obj instanceof Bignum) |
---|
453 | return rational().isGreaterThanOrEqualTo(obj); |
---|
454 | if (obj instanceof Ratio) |
---|
455 | return rational().isGreaterThanOrEqualTo(obj); |
---|
456 | type_error(obj, Symbol.REAL); |
---|
457 | // Not reached. |
---|
458 | return false; |
---|
459 | } |
---|
460 | |
---|
461 | @Override |
---|
462 | public LispObject truncate(LispObject obj) |
---|
463 | { |
---|
464 | // "When rationals and floats are combined by a numerical function, |
---|
465 | // the rational is first converted to a float of the same format." |
---|
466 | // 12.1.4.1 |
---|
467 | if (obj instanceof Fixnum) { |
---|
468 | return truncate(new DoubleFloat(((Fixnum)obj).value)); |
---|
469 | } |
---|
470 | if (obj instanceof Bignum) { |
---|
471 | return truncate(new DoubleFloat(((Bignum)obj).doubleValue())); |
---|
472 | } |
---|
473 | if (obj instanceof Ratio) { |
---|
474 | return truncate(new DoubleFloat(((Ratio)obj).doubleValue())); |
---|
475 | } |
---|
476 | if (obj instanceof SingleFloat) { |
---|
477 | final LispThread thread = LispThread.currentThread(); |
---|
478 | double divisor = ((SingleFloat)obj).value; |
---|
479 | double quotient = value / divisor; |
---|
480 | if (value != 0) |
---|
481 | MathFunctions.OverUnderFlowCheck(quotient); |
---|
482 | if (quotient >= Integer.MIN_VALUE && quotient <= Integer.MAX_VALUE) { |
---|
483 | int q = (int) quotient; |
---|
484 | return thread.setValues(Fixnum.getInstance(q), |
---|
485 | new DoubleFloat(value - q * divisor)); |
---|
486 | } |
---|
487 | // We need to convert the quotient to a bignum. |
---|
488 | long bits = Double.doubleToRawLongBits((double)quotient); |
---|
489 | int s = ((bits >> 63) == 0) ? 1 : -1; |
---|
490 | int e = (int) ((bits >> 52) & 0x7ffL); |
---|
491 | long m; |
---|
492 | if (e == 0) |
---|
493 | m = (bits & 0xfffffffffffffL) << 1; |
---|
494 | else |
---|
495 | m = (bits & 0xfffffffffffffL) | 0x10000000000000L; |
---|
496 | LispObject significand = number(m); |
---|
497 | Fixnum exponent = Fixnum.getInstance(e - 1075); |
---|
498 | Fixnum sign = Fixnum.getInstance(s); |
---|
499 | LispObject result = significand; |
---|
500 | result = |
---|
501 | result.multiplyBy(MathFunctions.EXPT.execute(Fixnum.TWO, exponent)); |
---|
502 | result = result.multiplyBy(sign); |
---|
503 | // Calculate remainder. |
---|
504 | LispObject product = result.multiplyBy(obj); |
---|
505 | LispObject remainder = subtract(product); |
---|
506 | return thread.setValues(result, remainder); |
---|
507 | } |
---|
508 | if (obj instanceof DoubleFloat) { |
---|
509 | // Debug.trace("value = " + value); |
---|
510 | final LispThread thread = LispThread.currentThread(); |
---|
511 | double divisor = ((DoubleFloat)obj).value; |
---|
512 | // Debug.trace("divisor = " + divisor); |
---|
513 | double quotient = value / divisor; |
---|
514 | if (value != 0) |
---|
515 | MathFunctions.OverUnderFlowCheck(quotient); |
---|
516 | // Debug.trace("quotient = " + quotient); |
---|
517 | if (quotient >= Integer.MIN_VALUE && quotient <= Integer.MAX_VALUE) { |
---|
518 | int q = (int) quotient; |
---|
519 | return thread.setValues(Fixnum.getInstance(q), |
---|
520 | new DoubleFloat(value - q * divisor)); |
---|
521 | } |
---|
522 | // We need to convert the quotient to a bignum. |
---|
523 | long bits = Double.doubleToRawLongBits((double)quotient); |
---|
524 | int s = ((bits >> 63) == 0) ? 1 : -1; |
---|
525 | int e = (int) ((bits >> 52) & 0x7ffL); |
---|
526 | long m; |
---|
527 | if (e == 0) |
---|
528 | m = (bits & 0xfffffffffffffL) << 1; |
---|
529 | else |
---|
530 | m = (bits & 0xfffffffffffffL) | 0x10000000000000L; |
---|
531 | LispObject significand = number(m); |
---|
532 | // Debug.trace("significand = " + significand.printObject()); |
---|
533 | Fixnum exponent = Fixnum.getInstance(e - 1075); |
---|
534 | // Debug.trace("exponent = " + exponent.printObject()); |
---|
535 | Fixnum sign = Fixnum.getInstance(s); |
---|
536 | // Debug.trace("sign = " + sign.printObject()); |
---|
537 | LispObject result = significand; |
---|
538 | // Debug.trace("result = " + result.printObject()); |
---|
539 | result = |
---|
540 | result.multiplyBy(MathFunctions.EXPT.execute(Fixnum.TWO, exponent)); |
---|
541 | // Debug.trace("result = " + result.printObject()); |
---|
542 | |
---|
543 | |
---|
544 | result = result.truncate(Fixnum.ONE); |
---|
545 | LispObject remainder = coerceToFloat(thread._values[1]); |
---|
546 | |
---|
547 | result = result.multiplyBy(sign); |
---|
548 | // Debug.trace("result = " + result.printObject()); |
---|
549 | // // Calculate remainder. |
---|
550 | // LispObject product = result.multiplyBy(obj); |
---|
551 | // Debug.trace("product = " + product.printObject()); |
---|
552 | // LispObject remainder = subtract(product); |
---|
553 | return thread.setValues(result, remainder); |
---|
554 | } |
---|
555 | return type_error(obj, Symbol.REAL); |
---|
556 | } |
---|
557 | |
---|
558 | @Override |
---|
559 | public int hashCode() |
---|
560 | { |
---|
561 | long bits = Double.doubleToLongBits(value); |
---|
562 | return (int) (bits ^ (bits >>> 32)); |
---|
563 | } |
---|
564 | |
---|
565 | @Override |
---|
566 | public int psxhash() |
---|
567 | { |
---|
568 | if ((value % 1) == 0) |
---|
569 | return (((int)value) & 0x7fffffff); |
---|
570 | else |
---|
571 | return (hashCode() & 0x7fffffff); |
---|
572 | } |
---|
573 | |
---|
574 | @Override |
---|
575 | public String printObject() |
---|
576 | { |
---|
577 | if (value == Double.POSITIVE_INFINITY) { |
---|
578 | StringBuilder sb = new StringBuilder("#."); |
---|
579 | sb.append(Symbol.DOUBLE_FLOAT_POSITIVE_INFINITY.printObject()); |
---|
580 | return sb.toString(); |
---|
581 | } |
---|
582 | if (value == Double.NEGATIVE_INFINITY) { |
---|
583 | StringBuilder sb = new StringBuilder("#."); |
---|
584 | sb.append(Symbol.DOUBLE_FLOAT_NEGATIVE_INFINITY.printObject()); |
---|
585 | return sb.toString(); |
---|
586 | } |
---|
587 | |
---|
588 | LispThread thread = LispThread.currentThread(); |
---|
589 | boolean printReadably = Symbol.PRINT_READABLY.symbolValue(thread) != NIL; |
---|
590 | |
---|
591 | if (value != value) { |
---|
592 | if (printReadably) |
---|
593 | return "#.(CL:PROGN \"Comment: create a NaN.\" (CL:/ 0.0d0 0.0d0))"; |
---|
594 | else |
---|
595 | return unreadableString("DOUBLE-FLOAT NaN", false); |
---|
596 | } |
---|
597 | String s1 = String.valueOf(value); |
---|
598 | if (printReadably || |
---|
599 | !memq(Symbol.READ_DEFAULT_FLOAT_FORMAT.symbolValue(thread), |
---|
600 | list(Symbol.DOUBLE_FLOAT, Symbol.LONG_FLOAT))) |
---|
601 | { |
---|
602 | if (s1.indexOf('E') >= 0) |
---|
603 | return s1.replace('E', 'd'); |
---|
604 | else |
---|
605 | return s1.concat("d0"); |
---|
606 | } else |
---|
607 | return s1; |
---|
608 | } |
---|
609 | |
---|
610 | public LispObject rational() |
---|
611 | { |
---|
612 | final long bits = Double.doubleToRawLongBits(value); |
---|
613 | int sign = ((bits >> 63) == 0) ? 1 : -1; |
---|
614 | int storedExponent = (int) ((bits >> 52) & 0x7ffL); |
---|
615 | long mantissa; |
---|
616 | if (storedExponent == 0) |
---|
617 | mantissa = (bits & 0xfffffffffffffL) << 1; |
---|
618 | else |
---|
619 | mantissa = (bits & 0xfffffffffffffL) | 0x10000000000000L; |
---|
620 | if (mantissa == 0) |
---|
621 | return Fixnum.ZERO; |
---|
622 | if (sign < 0) |
---|
623 | mantissa = -mantissa; |
---|
624 | // Subtract bias. |
---|
625 | final int exponent = storedExponent - 1023; |
---|
626 | BigInteger numerator, denominator; |
---|
627 | if (exponent < 0) { |
---|
628 | numerator = BigInteger.valueOf(mantissa); |
---|
629 | denominator = BigInteger.valueOf(1).shiftLeft(52 - exponent); |
---|
630 | } else { |
---|
631 | numerator = BigInteger.valueOf(mantissa).shiftLeft(exponent); |
---|
632 | denominator = BigInteger.valueOf(0x10000000000000L); // (ash 1 52) |
---|
633 | } |
---|
634 | return number(numerator, denominator); |
---|
635 | } |
---|
636 | |
---|
637 | public static DoubleFloat coerceToFloat(LispObject obj) |
---|
638 | { |
---|
639 | if (obj instanceof DoubleFloat) |
---|
640 | return (DoubleFloat) obj; |
---|
641 | if (obj instanceof Fixnum) |
---|
642 | return new DoubleFloat(((Fixnum)obj).value); |
---|
643 | if (obj instanceof Bignum) |
---|
644 | return new DoubleFloat(((Bignum)obj).doubleValue()); |
---|
645 | if (obj instanceof SingleFloat) |
---|
646 | return new DoubleFloat(((SingleFloat)obj).value); |
---|
647 | if (obj instanceof Ratio) |
---|
648 | return new DoubleFloat(((Ratio)obj).doubleValue()); |
---|
649 | error(new TypeError("The value " + obj.princToString() + |
---|
650 | " cannot be converted to type DOUBLE-FLOAT.")); |
---|
651 | // Not reached. |
---|
652 | return null; |
---|
653 | } |
---|
654 | } |
---|