1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
|
/*
* Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 4101566 4831589
* @summary Check for correct implementation of Math.rint(double)
*/
public class Rint {
static int testRintCase(double input, double expected) {
int failures = 0;
double result;
failures += Tests.test("Math.rint", input, Math.rint(input), expected);
failures += Tests.test("Math.rint", -input, Math.rint(-input), -expected);
failures += Tests.test("StrictMath.rint",
input, StrictMath.rint(input), expected);
failures += Tests.test("StrictMath.rint", -input,
StrictMath.rint(-input), -expected);
return failures;
}
public static void main(String args[]) {
int failures = 0;
double twoToThe52 = Math.scalb(1.0, 52); // 2^52
double [][] testCases = {
{0.0, 0.0},
{Double.MIN_VALUE, 0.0},
{Math.nextDown(Double.MIN_NORMAL), 0.0},
{Double.MIN_NORMAL, 0.0},
{0.2, 0.0},
{Math.nextDown(0.5), 0.0},
{ 0.5, 0.0},
{ Math.nextUp(0.5), 1.0},
{0.7, 1.0},
{Math.nextDown(1.0), 1.0},
{ 1.0, 1.0},
{ Math.nextUp(1.0), 1.0},
{Math.nextDown(1.5), 1.0},
{ 1.5, 2.0},
{ Math.nextUp(1.5), 2.0},
{4.2, 4.0},
{4.5, 4.0},
{4.7, 5.0},
{7.5, 8.0},
{7.2, 7.0},
{7.7, 8.0},
{150000.75, 150001.0},
{300000.5, 300000.0},
{Math.nextUp(300000.5), 300001.0},
{Math.nextDown(300000.75), 300001.0},
{300000.75, 300001.0},
{Math.nextUp(300000.75), 300001.0},
{300000.99, 300001.0},
{262144.75, 262145.0}, //(2^18 ) + 0.75
{499998.75, 499999.0},
{524287.75, 524288.0}, //(2^19 -1) + 0.75
{524288.75, 524289.0},
{Math.nextDown(twoToThe52), twoToThe52},
{twoToThe52, twoToThe52},
{Math.nextUp(twoToThe52), Math.nextUp(twoToThe52)},
{Double.MAX_VALUE, Double.MAX_VALUE},
{Double.POSITIVE_INFINITY, Double.POSITIVE_INFINITY},
{Double.NaN, Double.NaN}
};
for(int i = 0; i < testCases.length; i++) {
failures += testRintCase(testCases[i][0], testCases[i][1]);
}
// Test values throughout exponent range
for(double d = Double.MIN_VALUE;
d < Double.POSITIVE_INFINITY; d *= 2) {
failures += testRintCase(d, ((d<=0.5)?0.0:d));
}
if (failures > 0) {
System.err.println("Testing {Math, StrictMath}.rint incurred "
+ failures + " failures.");
throw new RuntimeException();
}
}
}
|
