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| 1 | +/* |
| 2 | + * Copyright (c) 2025, Oracle and/or its affiliates. All rights reserved. |
| 3 | + * Copyright (c) 2025, Rivos Inc. All rights reserved. |
| 4 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 | + * |
| 6 | + * This code is free software; you can redistribute it and/or modify it |
| 7 | + * under the terms of the GNU General Public License version 2 only, as |
| 8 | + * published by the Free Software Foundation. |
| 9 | + * |
| 10 | + * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | + * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | + * accompanied this code). |
| 15 | + * |
| 16 | + * You should have received a copy of the GNU General Public License version |
| 17 | + * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | + * |
| 20 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| 21 | + * or visit www.oracle.com if you need additional information or have any |
| 22 | + * questions. |
| 23 | + */ |
| 24 | + |
| 25 | +/* |
| 26 | + * @test |
| 27 | + * @bug 8365206 |
| 28 | + * @summary Verify NaN sign and significand bits are preserved across conversions, |
| 29 | + * float -> float16 -> float |
| 30 | + * @requires (os.arch == "riscv64" & vm.cpu.features ~= ".*zfh.*") |
| 31 | + * @requires vm.compiler1.enabled & vm.compiler2.enabled |
| 32 | + * @requires vm.compMode != "Xcomp" |
| 33 | + * @library /test/lib / |
| 34 | + * |
| 35 | + * @build jdk.test.whitebox.WhiteBox |
| 36 | + * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox |
| 37 | + * @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI |
| 38 | + * -Xmixed -XX:-BackgroundCompilation -XX:-UseOnStackReplacement |
| 39 | + * -XX:CompileThresholdScaling=1000.0 Binary16ConversionNaN_2 |
| 40 | + */ |
| 41 | + |
| 42 | +/* |
| 43 | + * The behavior tested below is an implementation property not |
| 44 | + * required by the specification. It would be acceptable for this |
| 45 | + * information to not be preserved (as long as a NaN is returned) if, |
| 46 | + * say, a intrinsified version using native hardware instructions |
| 47 | + * behaved differently. |
| 48 | + * |
| 49 | + * If that is the case, this test should be modified to disable |
| 50 | + * intrinsics or to otherwise not run on platforms with an differently |
| 51 | + * behaving intrinsic. |
| 52 | + */ |
| 53 | + |
| 54 | +import compiler.whitebox.CompilerWhiteBoxTest; |
| 55 | +import jdk.test.whitebox.WhiteBox; |
| 56 | +import java.lang.reflect.Method; |
| 57 | +import java.util.Random; |
| 58 | + |
| 59 | +public class Binary16ConversionNaN_2 { |
| 60 | + |
| 61 | + private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
| 62 | + |
| 63 | + /* |
| 64 | + * Put all 16-bit NaN values through a conversion loop and make |
| 65 | + * sure the significand, sign, and exponent are all preserved. |
| 66 | + */ |
| 67 | + public static void main(String... argv) throws NoSuchMethodException { |
| 68 | + int errors = 0; |
| 69 | + final int NAN_EXPONENT = 0x7f80_0000; |
| 70 | + final int SIGN_BIT = 0x8000_0000; |
| 71 | + |
| 72 | + // First, run with Interpreter only to collect "gold" data. |
| 73 | + // Glags -Xmixed -XX:CompileThresholdScaling=1000.0 are used |
| 74 | + // to prevent compilation during this phase. |
| 75 | + float[] pVal = new float[1024]; |
| 76 | + float[] pRes = new float[1024]; |
| 77 | + float[] nVal = new float[1024]; |
| 78 | + float[] nRes = new float[1024]; |
| 79 | + |
| 80 | + Random rand = new Random(); |
| 81 | + |
| 82 | + // A NaN has a nonzero significand |
| 83 | + for (int i = 1; i <= 0x3ff; i++) { |
| 84 | + int shift = rand.nextInt(13+1); |
| 85 | + int binaryNaN = (NAN_EXPONENT | (i << shift)); |
| 86 | + assert isNaN(binaryNaN); |
| 87 | + // the payloads of non-canonical NaNs are preserved. |
| 88 | + float f1 = Float.intBitsToFloat(binaryNaN); |
| 89 | + float f2 = testRoundTrip(f1); |
| 90 | + errors += verify(f1, f2); |
| 91 | + pVal[i] = f1; |
| 92 | + pRes[i] = f2; |
| 93 | + |
| 94 | + int binaryNegNaN = (SIGN_BIT | binaryNaN); |
| 95 | + float f3 = Float.intBitsToFloat(binaryNegNaN); |
| 96 | + float f4 = testRoundTrip(f3); |
| 97 | + errors += verify(f3, f4); |
| 98 | + nVal[i] = f3; |
| 99 | + nRes[i] = f4; |
| 100 | + } |
| 101 | + if (errors > 0) { // Exit if Interpreter failed |
| 102 | + throw new RuntimeException(errors + " errors"); |
| 103 | + } |
| 104 | + |
| 105 | + Method test_method = Binary16ConversionNaN_2.class.getDeclaredMethod("testRoundTrip", float.class); |
| 106 | + |
| 107 | + // Compile with C1 and compare results |
| 108 | + WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE); |
| 109 | + if (!WHITE_BOX.isMethodCompiled(test_method)) { |
| 110 | + throw new RuntimeException("test is not compiled by C1"); |
| 111 | + } |
| 112 | + for (int i = 1; i <= 0x3ff; i++) { |
| 113 | + float f1 = testRoundTrip(pVal[i]); |
| 114 | + errors += verifyCompiler(pRes[i], f1, "C1"); |
| 115 | + float f2 = testRoundTrip(nVal[i]); |
| 116 | + errors += verifyCompiler(nRes[i], f2, "C1"); |
| 117 | + } |
| 118 | + |
| 119 | + WHITE_BOX.deoptimizeMethod(test_method); |
| 120 | + |
| 121 | + // Compile with C2 and compare results |
| 122 | + WHITE_BOX.enqueueMethodForCompilation(test_method, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION); |
| 123 | + if (!WHITE_BOX.isMethodCompiled(test_method)) { |
| 124 | + throw new RuntimeException("test is not compiled by C2"); |
| 125 | + } |
| 126 | + for (int i = 1; i <= 0x3ff; i++) { |
| 127 | + float f1 = testRoundTrip(pVal[i]); |
| 128 | + errors += verifyCompiler(pRes[i], f1, "C2"); |
| 129 | + float f2 = testRoundTrip(nVal[i]); |
| 130 | + errors += verifyCompiler(nRes[i], f2, "C2"); |
| 131 | + } |
| 132 | + |
| 133 | + if (errors > 0) { |
| 134 | + throw new RuntimeException(errors + " errors"); |
| 135 | + } |
| 136 | + } |
| 137 | + |
| 138 | + private static boolean isNaN(int binary) { |
| 139 | + return ((binary & 0x7f80_0000) == 0x7f80_0000) // Max exponent and... |
| 140 | + && ((binary & 0x007f_ffff) != 0 ); // significand nonzero. |
| 141 | + } |
| 142 | + |
| 143 | + private static float testRoundTrip(float f) { |
| 144 | + short s = Float.floatToFloat16(f); |
| 145 | + return Float.float16ToFloat(s); |
| 146 | + } |
| 147 | + |
| 148 | + private static int verify(float f1, float f2) { |
| 149 | + int errors = 0; |
| 150 | + int i1 = Float.floatToRawIntBits(f1); |
| 151 | + int i2 = Float.floatToRawIntBits(f2); |
| 152 | + assert Float.isNaN(f1); |
| 153 | + if (!Float.isNaN(f2) || |
| 154 | + ((i1 & 0x8000_0000) != (i2 & 0x8000_0000))) { |
| 155 | + errors++; |
| 156 | + System.out.println("Roundtrip failure on NaN value " + |
| 157 | + Integer.toHexString(i1) + |
| 158 | + "\t got back " + Integer.toHexString(i2)); |
| 159 | + } |
| 160 | + return errors; |
| 161 | + } |
| 162 | + |
| 163 | + private static int verifyCompiler(float f1, float f2, String name) { |
| 164 | + int errors = 0; |
| 165 | + int i1 = Float.floatToRawIntBits(f1); |
| 166 | + int i2 = Float.floatToRawIntBits(f2); |
| 167 | + assert Float.isNaN(f1); |
| 168 | + if (!Float.isNaN(f2) || |
| 169 | + ((i1 & 0x8000_0000) != (i2 & 0x8000_0000))) { |
| 170 | + errors++; |
| 171 | + System.out.println("Roundtrip failure on NaN value " + |
| 172 | + Integer.toHexString(i1) + |
| 173 | + "\t got back " + Integer.toHexString(i2) + |
| 174 | + "\t from " + name + " code"); |
| 175 | + } |
| 176 | + return errors; |
| 177 | + } |
| 178 | +} |
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