1 /*
2 * Copyright (c) 2015, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 /**
26 * @test
27 * @bug 8073670
28 * @summary Test that causes C2 to fold two NaNs with different values into a single NaN.
29 * @run main/othervm -XX:-TieredCompilation -Xcomp -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_double_inf -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_double_zero -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_double_nan -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_float_inf -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_float_zero -XX:CompileCommand=compileonly,FloatingPointFoldingTest.test_float_nan FloatingPointFoldingTest
30 */
31
32 public class FloatingPointFoldingTest {
33 // Double values.
34 public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L;
35 public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS);
36
37 public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L;
38 public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS);
39
40 public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L;
41 public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS);
42
43 // We need two different NaN values. A floating point number is
44 // considered to be NaN is the sign bit is 0, all exponent bits
45 // are set to 1, and at least one bit of the exponent is not zero.
46 //
47 // As java.lang.Double.NaN is 0x7ff8000000000000L, we use
48 // 0x7ffc000000000000L as a second NaN double value.
49 public static final long NAN_LONGBITS = 0x7ffc000000000000L;
50 public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS);
51
52 // Float values.
53 public static final int MINUS_INF_INTBITS = 0xff800000;
54 public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS);
55
56 public static final int PLUS_INF_INTBITS = 0x7f800000;
57 public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS);
58
59 public static final int MINUS_ZERO_INTBITS = 0x80000000;
60 public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS);
61
62 // As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000
63 // as a second NaN float value.
64 public static final int NAN_INTBITS = 0x7fe00000;
65 public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS);
66
67
68 // Double tests.
69 static void test_double_inf(long[] result) {
70 double d1 = DOUBLE_MINUS_INF;
71 double d2 = DOUBLE_PLUS_INF;
72 result[0] = Double.doubleToRawLongBits(d1);
73 result[1] = Double.doubleToRawLongBits(d2);
74 }
75
76 static void test_double_zero(long[] result) {
77 double d1 = DOUBLE_MINUS_ZERO;
78 double d2 = 0;
79 result[0] = Double.doubleToRawLongBits(d1);
80 result[1] = Double.doubleToRawLongBits(d2);
81 }
82
83 static void test_double_nan(long[] result) {
84 double d1 = DOUBLE_NAN;
85 double d2 = Double.NaN;
86 result[0] = Double.doubleToRawLongBits(d1);
87 result[1] = Double.doubleToRawLongBits(d2);
88 }
89
90 // Float tests.
91 static void test_float_inf(int[] result) {
92 float f1 = FLOAT_MINUS_INF;
93 float f2 = FLOAT_PLUS_INF;
94 result[0] = Float.floatToRawIntBits(f1);
95 result[1] = Float.floatToRawIntBits(f2);
96 }
97
98 static void test_float_zero(int[] result) {
99 float f1 = FLOAT_MINUS_ZERO;
100 float f2 = 0;
101 result[0] = Float.floatToRawIntBits(f1);
102 result[1] = Float.floatToRawIntBits(f2);
103 }
104
105 static void test_float_nan(int[] result) {
106 float f1 = FLOAT_NAN;
107 float f2 = Float.NaN;
108 result[0] = Float.floatToRawIntBits(f1);
109 result[1] = Float.floatToRawIntBits(f2);
110 }
111
112 // Check doubles.
113 static void check_double(long[] result, double d1, double d2) {
114 if (result[0] == result[1]) {
115 throw new RuntimeException("ERROR: Two different double values are considered equal. \n"
116 + String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2))
117 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
118 }
119 }
120
121 // Check floats.
122 static void check_float(int[] result, float f1, float f2) {
123 if (result[0] == result[1]) {
124 throw new RuntimeException("ERROR: Two different float values are considered equal. \n"
125 + String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2))
126 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
127 }
128 }
129
130 public static void main(String[] args) {
131 // Float tests.
132
133 int[] iresult = new int[2];
134
135 // -Inf and +Inf.
136 test_float_inf(iresult);
137 check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF);
138
139 // 0 and -0.
140 test_float_zero(iresult);
141 check_float(iresult, FLOAT_MINUS_ZERO, 0);
142
143 // Diferrent NaNs.
144 test_float_nan(iresult);
145 check_float(iresult, FLOAT_NAN, Float.NaN);
146
147 // Double tests.
148
149 long[] lresult = new long[2];
150
151 // -Inf and +Inf.
152 test_double_inf(lresult);
153 check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF);
154
155 // 0 and -0.
156 test_double_zero(lresult);
157 check_double(lresult, DOUBLE_MINUS_ZERO, 0);
158
159 // Diferrent NaNs.
160 test_double_nan(lresult);
161 check_double(lresult, DOUBLE_NAN, Double.NaN);
162 }
163 }