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 * @test 26 * @bug 8073670 27 * @summary Test that causes C2 to fold two NaNs with different values into a single NaN. 28 * 29 * @run main/othervm -XX:-TieredCompilation -Xcomp 30 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_inf 31 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_zero 32 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_double_nan 33 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_inf 34 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_zero 35 * -XX:CompileCommand=compileonly,compiler.c2.FloatingPointFoldingTest::test_float_nan 36 * compiler.c2.FloatingPointFoldingTest 37 */ 38 39 package compiler.c2; 40 41 public class FloatingPointFoldingTest { 42 // Double values. 43 public static final long MINUS_INF_LONGBITS = 0xfff0000000000000L; 44 public static final double DOUBLE_MINUS_INF = Double.longBitsToDouble(MINUS_INF_LONGBITS); 45 46 public static final long PLUS_INF_LONGBITS = 0x7ff0000000000000L; 47 public static final double DOUBLE_PLUS_INF = Double.longBitsToDouble(PLUS_INF_LONGBITS); 48 49 public static final long MINUS_ZERO_LONGBITS = 0x8000000000000000L; 50 public static final double DOUBLE_MINUS_ZERO = Double.longBitsToDouble(MINUS_ZERO_LONGBITS); 51 52 // We need two different NaN values. A floating point number is 53 // considered to be NaN is the sign bit is 0, all exponent bits 54 // are set to 1, and at least one bit of the exponent is not zero. 55 // 56 // As java.lang.Double.NaN is 0x7ff8000000000000L, we use 57 // 0x7ffc000000000000L as a second NaN double value. 58 public static final long NAN_LONGBITS = 0x7ffc000000000000L; 59 public static final double DOUBLE_NAN = Double.longBitsToDouble(NAN_LONGBITS); 60 61 // Float values. 62 public static final int MINUS_INF_INTBITS = 0xff800000; 63 public static final float FLOAT_MINUS_INF = Float.intBitsToFloat(MINUS_INF_INTBITS); 64 65 public static final int PLUS_INF_INTBITS = 0x7f800000; 66 public static final float FLOAT_PLUS_INF = Float.intBitsToFloat(PLUS_INF_INTBITS); 67 68 public static final int MINUS_ZERO_INTBITS = 0x80000000; 69 public static final float FLOAT_MINUS_ZERO = Float.intBitsToFloat(MINUS_ZERO_INTBITS); 70 71 // As java.lang.Float.NaN is 0x7fc00000, we use 0x7fe00000 72 // as a second NaN float value. 73 public static final int NAN_INTBITS = 0x7fe00000; 74 public static final float FLOAT_NAN = Float.intBitsToFloat(NAN_INTBITS); 75 76 77 // Double tests. test_double_inf(long[] result)78 static void test_double_inf(long[] result) { 79 double d1 = DOUBLE_MINUS_INF; 80 double d2 = DOUBLE_PLUS_INF; 81 result[0] = Double.doubleToRawLongBits(d1); 82 result[1] = Double.doubleToRawLongBits(d2); 83 } 84 test_double_zero(long[] result)85 static void test_double_zero(long[] result) { 86 double d1 = DOUBLE_MINUS_ZERO; 87 double d2 = 0; 88 result[0] = Double.doubleToRawLongBits(d1); 89 result[1] = Double.doubleToRawLongBits(d2); 90 } 91 test_double_nan(long[] result)92 static void test_double_nan(long[] result) { 93 double d1 = DOUBLE_NAN; 94 double d2 = Double.NaN; 95 result[0] = Double.doubleToRawLongBits(d1); 96 result[1] = Double.doubleToRawLongBits(d2); 97 } 98 99 // Float tests. test_float_inf(int[] result)100 static void test_float_inf(int[] result) { 101 float f1 = FLOAT_MINUS_INF; 102 float f2 = FLOAT_PLUS_INF; 103 result[0] = Float.floatToRawIntBits(f1); 104 result[1] = Float.floatToRawIntBits(f2); 105 } 106 test_float_zero(int[] result)107 static void test_float_zero(int[] result) { 108 float f1 = FLOAT_MINUS_ZERO; 109 float f2 = 0; 110 result[0] = Float.floatToRawIntBits(f1); 111 result[1] = Float.floatToRawIntBits(f2); 112 } 113 test_float_nan(int[] result)114 static void test_float_nan(int[] result) { 115 float f1 = FLOAT_NAN; 116 float f2 = Float.NaN; 117 result[0] = Float.floatToRawIntBits(f1); 118 result[1] = Float.floatToRawIntBits(f2); 119 } 120 121 // Check doubles. check_double(long[] result, double d1, double d2)122 static void check_double(long[] result, double d1, double d2) { 123 if (result[0] == result[1]) { 124 throw new RuntimeException("ERROR: Two different double values are considered equal. \n" 125 + String.format("\toriginal values: 0x%x 0x%x\n", Double.doubleToRawLongBits(d1), Double.doubleToRawLongBits(d2)) 126 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1])); 127 } 128 } 129 130 // Check floats. check_float(int[] result, float f1, float f2)131 static void check_float(int[] result, float f1, float f2) { 132 if (result[0] == result[1]) { 133 throw new RuntimeException("ERROR: Two different float values are considered equal. \n" 134 + String.format("\toriginal values: 0x%x 0x%x\n", Float.floatToRawIntBits(f1), Float.floatToRawIntBits(f2)) 135 + String.format("\tvalues after execution of method test(): 0x%x 0x%x", result[0], result[1])); 136 } 137 } 138 main(String[] args)139 public static void main(String[] args) { 140 // Float tests. 141 142 int[] iresult = new int[2]; 143 144 // -Inf and +Inf. 145 test_float_inf(iresult); 146 check_float(iresult, FLOAT_MINUS_INF, FLOAT_PLUS_INF); 147 148 // 0 and -0. 149 test_float_zero(iresult); 150 check_float(iresult, FLOAT_MINUS_ZERO, 0); 151 152 // Diferrent NaNs. 153 test_float_nan(iresult); 154 check_float(iresult, FLOAT_NAN, Float.NaN); 155 156 // Double tests. 157 158 long[] lresult = new long[2]; 159 160 // -Inf and +Inf. 161 test_double_inf(lresult); 162 check_double(lresult, DOUBLE_MINUS_INF, DOUBLE_PLUS_INF); 163 164 // 0 and -0. 165 test_double_zero(lresult); 166 check_double(lresult, DOUBLE_MINUS_ZERO, 0); 167 168 // Diferrent NaNs. 169 test_double_nan(lresult); 170 check_double(lresult, DOUBLE_NAN, Double.NaN); 171 } 172 } 173