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
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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 *
30 * @run main/othervm -XX:-TieredCompilation -Xcomp
31 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_inf
32 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_zero
33 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_nan
34 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_inf
35 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_zero
36 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_nan
37 * compiler.c2.FloatingPointFoldingTest
38 */
39
40 package compiler.c2;
41
42 public class FloatingPointFoldingTest {
43 // Double values.
44 public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L;
45 public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS);
46
47 public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L;
48 public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS);
49
50 public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L;
51 public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS);
52
53 // We need two different NaN values. A floating point number is
54 // considered to be NaN is the sign bit is 0, all exponent bits
55 // are set to 1, and at least one bit of the exponent is not zero.
56 //
57 // As java.lang.Double.NaN is 0x7ff8000000000000L, we use
58 // 0x7ffc000000000000L as a second NaN double value.
59 public static final long NAN_LONGBITS = 0x7ffc000000000000L;
60 public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS);
61
62 // Float values.
63 public static final int MINUS_INF_INTBITS = 0xff800000;
64 public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS);
65
66 public static final int PLUS_INF_INTBITS = 0x7f800000;
67 public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS);
68
69 public static final int MINUS_ZERO_INTBITS = 0x80000000;
70 public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS);
71
72 // As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000
73 // as a second NaN float value.
74 public static final int NAN_INTBITS = 0x7fe00000;
75 public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS);
76
77
78 // Double tests.
79 static void test_double_inf(long[] result) {
80 double d1 = DOUBLE_MINUS_INF;
81 double d2 = DOUBLE_PLUS_INF;
82 result[0] = Double.doubleToRawLongBits(d1);
83 result[1] = Double.doubleToRawLongBits(d2);
84 }
85
86 static void test_double_zero(long[] result) {
87 double d1 = DOUBLE_MINUS_ZERO;
88 double d2 = 0;
89 result[0] = Double.doubleToRawLongBits(d1);
90 result[1] = Double.doubleToRawLongBits(d2);
91 }
92
93 static void test_double_nan(long[] result) {
94 double d1 = DOUBLE_NAN;
95 double d2 = Double.NaN;
96 result[0] = Double.doubleToRawLongBits(d1);
97 result[1] = Double.doubleToRawLongBits(d2);
98 }
99
100 // Float tests.
101 static void test_float_inf(int[] result) {
102 float f1 = FLOAT_MINUS_INF;
103 float f2 = FLOAT_PLUS_INF;
104 result[0] = Float.floatToRawIntBits(f1);
105 result[1] = Float.floatToRawIntBits(f2);
106 }
107
108 static void test_float_zero(int[] result) {
109 float f1 = FLOAT_MINUS_ZERO;
110 float f2 = 0;
111 result[0] = Float.floatToRawIntBits(f1);
112 result[1] = Float.floatToRawIntBits(f2);
113 }
114
115 static void test_float_nan(int[] result) {
116 float f1 = FLOAT_NAN;
117 float f2 = Float.NaN;
118 result[0] = Float.floatToRawIntBits(f1);
119 result[1] = Float.floatToRawIntBits(f2);
120 }
121
122 // Check doubles.
123 static void check_double(long[] result, double d1, double d2) {
124 if (result[0] == result[1]) {
125 throw new RuntimeException("ERROR: Two different double values are considered equal. \n"
126 + String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2))
127 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
128 }
129 }
130
131 // Check floats.
132 static void check_float(int[] result, float f1, float f2) {
133 if (result[0] == result[1]) {
134 throw new RuntimeException("ERROR: Two different float values are considered equal. \n"
135 + String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2))
136 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1]));
137 }
138 }
139
140 public static void main(String[] args) {
141 // Float tests.
142
143 int[] iresult = new int[2];
144
145 // -Inf and +Inf.
146 test_float_inf(iresult);
147 check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF);
148
149 // 0 and -0.
150 test_float_zero(iresult);
151 check_float(iresult, FLOAT_MINUS_ZERO, 0);
152
153 // Diferrent NaNs.
154 test_float_nan(iresult);
155 check_float(iresult, FLOAT_NAN, Float.NaN);
156
157 // Double tests.
158
159 long[] lresult = new long[2];
160
161 // -Inf and +Inf.
162 test_double_inf(lresult);
163 check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF);
164
165 // 0 and -0.
166 test_double_zero(lresult);
167 check_double(lresult, DOUBLE_MINUS_ZERO, 0);
168
169 // Diferrent NaNs.
170 test_double_nan(lresult);
171 check_double(lresult, DOUBLE_NAN, Double.NaN);
172 }
173 }