| /* |
| * Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 6430675 8010430 |
| * @summary Check for correct implementation of {Math, StrictMath}.round |
| */ |
| public class RoundTests { |
| public static void main(String... args) { |
| int failures = 0; |
| |
| failures += testNearFloatHalfCases(); |
| failures += testNearDoubleHalfCases(); |
| failures += testUnityULPCases(); |
| failures += testSpecialCases(); |
| |
| if (failures > 0) { |
| System.err.println("Testing {Math, StrictMath}.round incurred " |
| + failures + " failures."); |
| throw new RuntimeException(); |
| } |
| } |
| |
| private static int testNearDoubleHalfCases() { |
| int failures = 0; |
| double [][] testCases = { |
| {+0x1.fffffffffffffp-2, 0.0}, |
| {+0x1.0p-1, 1.0}, // +0.5 |
| {+0x1.0000000000001p-1, 1.0}, |
| |
| {-0x1.fffffffffffffp-2, 0.0}, |
| {-0x1.0p-1, 0.0}, // -0.5 |
| {-0x1.0000000000001p-1, -1.0}, |
| }; |
| |
| for(double[] testCase : testCases) { |
| failures += testNearHalfCases(testCase[0], (long)testCase[1]); |
| } |
| |
| return failures; |
| } |
| |
| private static int testNearHalfCases(double input, double expected) { |
| int failures = 0; |
| |
| failures += Tests.test("Math.round", input, Math.round(input), expected); |
| failures += Tests.test("StrictMath.round", input, StrictMath.round(input), expected); |
| |
| return failures; |
| } |
| |
| private static int testNearFloatHalfCases() { |
| int failures = 0; |
| float [][] testCases = { |
| {+0x1.fffffep-2f, 0.0f}, |
| {+0x1.0p-1f, 1.0f}, // +0.5 |
| {+0x1.000002p-1f, 1.0f}, |
| |
| {-0x1.fffffep-2f, 0.0f}, |
| {-0x1.0p-1f, 0.0f}, // -0.5 |
| {-0x1.000002p-1f, -1.0f}, |
| }; |
| |
| for(float[] testCase : testCases) { |
| failures += testNearHalfCases(testCase[0], (int)testCase[1]); |
| } |
| |
| return failures; |
| } |
| |
| private static int testNearHalfCases(float input, float expected) { |
| int failures = 0; |
| |
| failures += Tests.test("Math.round", input, Math.round(input), expected); |
| failures += Tests.test("StrictMath.round", input, StrictMath.round(input), expected); |
| |
| return failures; |
| } |
| |
| private static int testUnityULPCases() { |
| int failures = 0; |
| for (float sign : new float[]{-1, 1}) { |
| for (float v1 : new float[]{1 << 23, 1 << 24}) { |
| for (int k = -5; k <= 5; k++) { |
| float value = (v1 + k) * sign; |
| float actual = Math.round(value); |
| failures += Tests.test("Math.round", value, actual, value); |
| } |
| } |
| } |
| |
| if (failures != 0) { |
| System.out.println(); |
| } |
| |
| for (double sign : new double[]{-1, 1}) { |
| for (double v1 : new double[]{1L << 52, 1L << 53}) { |
| for (int k = -5; k <= 5; k++) { |
| double value = (v1 + k) * sign; |
| double actual = Math.round(value); |
| failures += Tests.test("Math.round", value, actual, value); |
| } |
| } |
| } |
| |
| return failures; |
| } |
| |
| private static int testSpecialCases() { |
| int failures = 0; |
| |
| failures += Tests.test("Math.round", Float.NaN, Math.round(Float.NaN), 0.0F); |
| failures += Tests.test("Math.round", Float.POSITIVE_INFINITY, |
| Math.round(Float.POSITIVE_INFINITY), Integer.MAX_VALUE); |
| failures += Tests.test("Math.round", Float.NEGATIVE_INFINITY, |
| Math.round(Float.NEGATIVE_INFINITY), Integer.MIN_VALUE); |
| failures += Tests.test("Math.round", -(float)Integer.MIN_VALUE, |
| Math.round(-(float)Integer.MIN_VALUE), Integer.MAX_VALUE); |
| failures += Tests.test("Math.round", (float) Integer.MIN_VALUE, |
| Math.round((float) Integer.MIN_VALUE), Integer.MIN_VALUE); |
| failures += Tests.test("Math.round", 0F, Math.round(0F), 0.0F); |
| failures += Tests.test("Math.round", Float.MIN_VALUE, |
| Math.round(Float.MIN_VALUE), 0.0F); |
| failures += Tests.test("Math.round", -Float.MIN_VALUE, |
| Math.round(-Float.MIN_VALUE), 0.0F); |
| |
| failures += Tests.test("Math.round", Double.NaN, Math.round(Double.NaN), 0.0); |
| failures += Tests.test("Math.round", Double.POSITIVE_INFINITY, |
| Math.round(Double.POSITIVE_INFINITY), Long.MAX_VALUE); |
| failures += Tests.test("Math.round", Double.NEGATIVE_INFINITY, |
| Math.round(Double.NEGATIVE_INFINITY), Long.MIN_VALUE); |
| failures += Tests.test("Math.round", -(double)Long.MIN_VALUE, |
| Math.round(-(double)Long.MIN_VALUE), Long.MAX_VALUE); |
| failures += Tests.test("Math.round", (double) Long.MIN_VALUE, |
| Math.round((double) Long.MIN_VALUE), Long.MIN_VALUE); |
| failures += Tests.test("Math.round", 0, Math.round(0), 0.0); |
| failures += Tests.test("Math.round", Double.MIN_VALUE, |
| Math.round(Double.MIN_VALUE), 0.0); |
| failures += Tests.test("Math.round", -Double.MIN_VALUE, |
| Math.round(-Double.MIN_VALUE), 0.0); |
| |
| return failures; |
| } |
| } |