1 /*
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3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5  * This code is free software; you can redistribute it and/or modify it
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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
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17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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22  */
23 
24 /*
25  * @test
26  * @bug 5037596
27  * @summary Verify bitwise conversion works for non-canonical NaN values
28  * @library ../Math
29  * @build FloatConsts
30  * @run main BitwiseConversion
31  * @author Joseph D. Darcy
32  */
33 package test.java.lang.Float;
34 
35 import static java.lang.Float.*;
36 
37 import jdk.internal.math.FloatConsts;
38 
39 import org.testng.annotations.Test;
40 import org.testng.Assert;
41 
42 public class BitwiseConversionTest {
testNanCase(int x)43     static void testNanCase(int x) {
44         // Strip out sign and exponent bits
45         int y = x & FloatConsts.SIGNIF_BIT_MASK;
46 
47         float[] values = {
48             intBitsToFloat(FloatConsts.EXP_BIT_MASK | y),
49             intBitsToFloat(FloatConsts.SIGN_BIT_MASK | FloatConsts.EXP_BIT_MASK | y)
50         };
51 
52         for(float value: values) {
53             Assert.assertTrue(isNaN(value), "Invalid input " + y + "yielded non-NaN" + value);
54 
55             int converted = floatToIntBits(value);
56             Assert.assertEquals(converted, 0x7fc00000,
57                 String.format("Non-canonical NaN bits returned: %x%n", converted));
58         }
59     }
60 
61     @Test
testNanCases()62     public void testNanCases() {
63         for (int i = 0; i < FloatConsts.SIGNIFICAND_WIDTH - 1; i++) {
64             testNanCase(1 << i);
65         }
66     }
67 
68     @Test
testFloatToIntBits()69     public void testFloatToIntBits() {
70         Assert.assertEquals (floatToIntBits(Float.POSITIVE_INFINITY), 0x7F800000,
71             "Bad conversion for +infinity.");
72 
73         Assert.assertEquals(floatToIntBits(Float.NEGATIVE_INFINITY), 0xFF800000,
74             "Bad conversion for -infinity.");
75     }
76 }
77