/*
* Copyright (c) 2015, 2016, 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.
*/
import sun.java2d.marlin.FloatMath;
/*
* @test
* @summary Check for correct implementation of FloatMath.ceil/floor
* @run main CeilAndFloorTests
* @modules java.desktop/sun.java2d.marlin
*/
public class CeilAndFloorTests {
public static String toHexString(float f) {
if (!Float.isNaN(f))
return Float.toHexString(f);
else
return "NaN(0x" + Integer.toHexString(Float.floatToRawIntBits(f)) + ")";
}
public static int test(String testName, float input,
float result, float expected) {
if (Float.compare(expected, result) != 0) {
System.err.println("Failure for " + testName + ":\n" +
"\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
"\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
"\tgot " + result + "\t(" + toHexString(result) + ").");
return 1;
}
else
return 0;
}
public static int test_skip_0(String testName, float input,
float result, float expected)
{
// floor_int does not distinguish +0f and -0f
// but it is not critical for Marlin
if (Float.compare(expected, result) != 0 && (expected != 0f))
{
System.err.println("Failure for " + testName + ":\n" +
"\tFor input " + input + "\t(" + toHexString(input) + ")\n" +
"\texpected " + expected + "\t(" + toHexString(expected) + ")\n" +
"\tgot " + result + "\t(" + toHexString(result) + ").");
return 1;
}
else
return 0;
}
private static int testCeilCase(float input, float expected) {
int failures = 0;
// float result:
failures += test("FloatMath.ceil_f", input, FloatMath.ceil_f(input), expected);
// int result:
failures += test("FloatMath.ceil_int", input, FloatMath.ceil_int(input), (int)expected);
failures += test("FloatMath.ceil_f (int)", input, (int)FloatMath.ceil_f(input), (int)expected);
return failures;
}
private static int testFloorCase(float input, float expected) {
int failures = 0;
// float result:
failures += test ("FloatMath.floor_f", input, FloatMath.floor_f(input), expected);
// ignore difference between +0f and -0f:
failures += test_skip_0("FloatMath.floor_int", input, FloatMath.floor_int(input), (int)expected);
failures += test_skip_0("FloatMath.floor_f (int)", input, (int)FloatMath.floor_f(input), (int)expected);
return failures;
}
private static int nearIntegerTests() {
int failures = 0;
float [] fixedPoints = {
-0.0f,
0.0f,
-1.0f,
1.0f,
-0x1.0p52f,
0x1.0p52f,
-Float.MAX_VALUE,
Float.MAX_VALUE,
Float.NEGATIVE_INFINITY,
Float.POSITIVE_INFINITY,
Float.NaN,
};
for(float fixedPoint : fixedPoints) {
failures += testCeilCase(fixedPoint, fixedPoint);
failures += testFloorCase(fixedPoint, fixedPoint);
}
for(int i = Float.MIN_EXPONENT; i <= Float.MAX_EXPONENT; i++) {
float powerOfTwo = Math.scalb(1.0f, i);
float neighborDown = Math.nextDown(powerOfTwo);
float neighborUp = Math.nextUp(powerOfTwo);
if (i < 0) {
failures += testCeilCase( powerOfTwo, 1.0f);
failures += testCeilCase(-powerOfTwo, -0.0f);
failures += testFloorCase( powerOfTwo, 0.0f);
failures += testFloorCase(-powerOfTwo, -1.0f);
failures += testCeilCase( neighborDown, 1.0f);
failures += testCeilCase(-neighborDown, -0.0f);
failures += testFloorCase( neighborUp, 0.0f);
failures += testFloorCase(-neighborUp, -1.0f);
} else {
failures += testCeilCase(powerOfTwo, powerOfTwo);
failures += testFloorCase(powerOfTwo, powerOfTwo);
if (neighborDown==Math.rint(neighborDown)) {
failures += testCeilCase( neighborDown, neighborDown);
failures += testCeilCase(-neighborDown, -neighborDown);
failures += testFloorCase( neighborDown, neighborDown);
failures += testFloorCase(-neighborDown,-neighborDown);
} else {
failures += testCeilCase( neighborDown, powerOfTwo);
failures += testFloorCase(-neighborDown, -powerOfTwo);
}
if (neighborUp==Math.rint(neighborUp)) {
failures += testCeilCase(neighborUp, neighborUp);
failures += testCeilCase(-neighborUp, -neighborUp);
failures += testFloorCase(neighborUp, neighborUp);
failures += testFloorCase(-neighborUp, -neighborUp);
} else {
failures += testFloorCase(neighborUp, powerOfTwo);
failures += testCeilCase(-neighborUp, -powerOfTwo);
}
}
}
for(int i = -(0x10000); i <= 0x10000; i++) {
float f = (float) i;
float neighborDown = Math.nextDown(f);
float neighborUp = Math.nextUp(f);
failures += testCeilCase( f, f);
failures += testCeilCase(-f, -f);
failures += testFloorCase( f, f);
failures += testFloorCase(-f, -f);
if (Math.abs(f) > 1.0) {
failures += testCeilCase( neighborDown, f);
failures += testCeilCase(-neighborDown, -f+1);
failures += testFloorCase( neighborUp, f);
failures += testFloorCase(-neighborUp, -f-1);
}
}
return failures;
}
public static int roundingTests() {
int failures = 0;
float [][] testCases = {
{ Float.MIN_VALUE, 1.0f},
{-Float.MIN_VALUE, -0.0f},
{ Math.nextDown(Float.MIN_NORMAL), 1.0f},
{-Math.nextDown(Float.MIN_NORMAL), -0.0f},
{ Float.MIN_NORMAL, 1.0f},
{-Float.MIN_NORMAL, -0.0f},
{ 0.1f, 1.0f},
{-0.1f, -0.0f},
{ 0.5f, 1.0f},
{-0.5f, -0.0f},
{ 1.5f, 2.0f},
{-1.5f, -1.0f},
{ 2.5f, 3.0f},
{-2.5f, -2.0f},
{ 12.3456789f, 13.0f},
{-12.3456789f, -12.0f},
{ Math.nextDown(1.0f), 1.0f},
{ Math.nextDown(-1.0f), -1.0f},
{ Math.nextUp(1.0f), 2.0f},
{ Math.nextUp(-1.0f), -0.0f},
{ 0x1.0p22f, 0x1.0p22f},
{-0x1.0p22f, -0x1.0p22f},
{ Math.nextDown(0x1.0p22f), 0x1.0p22f},
{-Math.nextUp(0x1.0p22f), -0x1.0p22f},
{ Math.nextUp(0x1.0p22f), 0x1.0p22f+1f},
{-Math.nextDown(0x1.0p22f), -0x1.0p22f+1f},
{ Math.nextDown(0x1.0p23f), 0x1.0p23f},
{-Math.nextUp(0x1.0p23f), -0x1.0p23f-1f},
{ Math.nextUp(0x1.0p23f), 0x1.0p23f+1f},
{-Math.nextDown(0x1.0p23f), -0x1.0p23f+1f},
};
for(float[] testCase : testCases) {
failures += testCeilCase(testCase[0], testCase[1]);
failures += testFloorCase(-testCase[0], -testCase[1]);
}
return failures;
}
public static void main(String... args) {
int failures = 0;
System.out.println("nearIntegerTests");
failures += nearIntegerTests();
System.out.println("roundingTests");
failures += roundingTests();
if (failures > 0) {
System.err.println("Testing {FloatMath}.ceil/floor incurred "
+ failures + " failures.");
throw new RuntimeException();
}
}
}