1 /*
2 * Copyright 2005 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 * @test
26 * @bug 6274390
27 * @summary Verify {float, double}Value methods work with condensed representation
28 */
29 import java.math.*;
30
31 public class FloatDoubleValueTests {
32 private static final long two2the24 = 1L<<23;
33 private static final long two2the53 = 1L<<52;
34
35 // Largest long that fits exactly in a float
36 private static final long maxFltLong = (long)(Integer.MAX_VALUE & ~(0xff));
37
38 // Largest long that fits exactly in a double
39 private static final long maxDblLong = Long.MAX_VALUE & ~(0x7ffL);
40
41 static void testDoubleValue0(long i, BigDecimal bd) {
42 if (bd.doubleValue() != i ||
43 bd.longValue() != i)
44 throw new RuntimeException("Unexpected equality failure for " +
45 i + "\t" + bd);
46 }
47
48 static void testFloatValue0(long i, BigDecimal bd) {
49 if (bd.floatValue() != i ||
50 bd.longValue() != i)
51 throw new RuntimeException("Unexpected equality failure for " +
52 i + "\t" + bd);
53 }
54
55 static void checkFloat(BigDecimal bd, float f) {
56 float fbd = bd.floatValue();
57 if (f != fbd ) {
58 String message = String.format("Bad conversion:"+
59 "got %g (%a)\texpected %g (%a)",
60 f, f, fbd, fbd);
61 throw new RuntimeException(message);
62 }
63 }
64
65 static void checkDouble(BigDecimal bd, double d) {
66 double dbd = bd.doubleValue();
67 if (d != dbd ) {
68 String message = String.format("Bad conversion:"+
69 "got %g (%a)\texpected %g (%a)",
70 d, d, dbd, dbd);
71 throw new RuntimeException(message);
72 }
73 }
74
75 // Test integral values that will convert exactly to both float
76 // and double.
77 static void testFloatDoubleValue() {
78 long longValues[] = {
79 0,
80 1,
81 2,
82
83 two2the24-1,
84 two2the24,
85 two2the24+1,
86
87 maxFltLong-1,
88 maxFltLong,
89 maxFltLong+1,
90 };
91
92 for(long i : longValues) {
93 BigDecimal bd1 = new BigDecimal(i);
94 BigDecimal bd2 = new BigDecimal(-i);
95
96 testDoubleValue0( i, bd1);
97 testDoubleValue0(-i, bd2);
98
99 testFloatValue0( i, bd1);
100 testFloatValue0(-i, bd2);
101 }
102
103 }
104
105 static void testDoubleValue() {
106 long longValues[] = {
107 Integer.MAX_VALUE-1,
108 Integer.MAX_VALUE,
109 (long)Integer.MAX_VALUE+1,
110
111 two2the53-1,
112 two2the53,
113 two2the53+1,
114
115 maxDblLong,
116 };
117
118 // Test integral values that will convert exactly to double
119 // but not float.
120 for(long i : longValues) {
121 BigDecimal bd1 = new BigDecimal(i);
122 BigDecimal bd2 = new BigDecimal(-i);
123
124 testDoubleValue0( i, bd1);
125 testDoubleValue0(-i, bd2);
126
127 checkFloat(bd1, (float)i);
128 checkFloat(bd2, -(float)i);
129 }
130
131 // Now check values that should not convert the same in double
132 for(long i = maxDblLong; i < Long.MAX_VALUE; i++) {
133 BigDecimal bd1 = new BigDecimal(i);
134 BigDecimal bd2 = new BigDecimal(-i);
135 checkDouble(bd1, (double)i);
136 checkDouble(bd2, -(double)i);
137
138 checkFloat(bd1, (float)i);
139 checkFloat(bd2, -(float)i);
140 }
141
142 checkDouble(new BigDecimal(Long.MIN_VALUE), (double)Long.MIN_VALUE);
143 checkDouble(new BigDecimal(Long.MAX_VALUE), (double)Long.MAX_VALUE);
144 }
145
146 static void testFloatValue() {
147 // Now check values that should not convert the same in float
148 for(long i = maxFltLong; i <= Integer.MAX_VALUE; i++) {
149 BigDecimal bd1 = new BigDecimal(i);
150 BigDecimal bd2 = new BigDecimal(-i);
151 checkFloat(bd1, (float)i);
152 checkFloat(bd2, -(float)i);
153
154 testDoubleValue0( i, bd1);
155 testDoubleValue0(-i, bd2);
156 }
157 }
158
159 public static void main(String[] args) throws Exception {
160 testFloatDoubleValue();
161 testDoubleValue();
162 testFloatValue();
163 }
164 }