com.sun.marlin.FloatMath Maven / Gradle / Ivy
/*
* Copyright (c) 2015, 2017, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.
*/
package com.sun.marlin;
/**
* Faster Math ceil / floor routines derived from StrictMath
*/
public final class FloatMath implements MarlinConst {
// overflow / NaN handling enabled:
static final boolean CHECK_OVERFLOW = true;
static final boolean CHECK_NAN = true;
private FloatMath() {
// utility class
}
// faster inlined min/max functions in the branch prediction is high
public static int max(final int a, final int b) {
return (a >= b) ? a : b;
}
public static int min(final int a, final int b) {
return (a <= b) ? a : b;
}
/**
* Faster alternative to ceil(float) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) integer value
* that less than or equal to the argument and is equal to a mathematical
* integer.
*/
public static int ceil_int(final float a) {
final int intpart = (int) a;
if (a <= intpart
|| (CHECK_OVERFLOW && intpart == Integer.MAX_VALUE)
|| CHECK_NAN && Float.isNaN(a)) {
return intpart;
}
return intpart + 1;
}
/**
* Faster alternative to ceil(double) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) integer value
* that less than or equal to the argument and is equal to a mathematical
* integer.
*/
public static int ceil_int(final double a) {
final int intpart = (int) a;
if (a <= intpart
|| (CHECK_OVERFLOW && intpart == Integer.MAX_VALUE)
|| CHECK_NAN && Double.isNaN(a)) {
return intpart;
}
return intpart + 1;
}
/**
* Faster alternative to floor(float) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) floating-point value
* that less than or equal to the argument and is equal to a mathematical
* integer.
*/
public static int floor_int(final float a) {
final int intpart = (int) a;
if (a >= intpart
|| (CHECK_OVERFLOW && intpart == Integer.MIN_VALUE)
|| CHECK_NAN && Float.isNaN(a)) {
return intpart;
}
return intpart - 1;
}
/**
* Faster alternative to floor(double) optimized for the integer domain
* and supporting NaN and +/-Infinity.
*
* @param a a value.
* @return the largest (closest to positive infinity) floating-point value
* that less than or equal to the argument and is equal to a mathematical
* integer.
*/
public static int floor_int(final double a) {
final int intpart = (int) a;
if (a >= intpart
|| (CHECK_OVERFLOW && intpart == Integer.MIN_VALUE)
|| CHECK_NAN && Double.isNaN(a)) {
return intpart;
}
return intpart - 1;
}
}