test/java/lang/Math/RoundTests.java
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rev 7994 : 8010430: Math.round has surprising behavior for odd values of ulp 1
Summary: If the effective floating point exponent is zero return the significand including the implicit 1-bit.
Reviewed-by: bpb, darcy, gls
Contributed-by: Dmitry Nadezhin <dmitry.nadezhin@oracle.com>
*** 1,7 ****
/*
! * Copyright (c) 2011, 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.
--- 1,7 ----
/*
! * 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.
*** 21,39 ****
* questions.
*/
/*
* @test
! * @bug 6430675
* @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();
if (failures > 0) {
System.err.println("Testing {Math, StrictMath}.round incurred "
+ failures + " failures.");
throw new RuntimeException();
--- 21,41 ----
* 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();
*** 93,98 ****
--- 95,165 ----
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;
+ }
}