From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/gnu/java/math/Fixed.java | 220 +++++++++++++++++++++++++++++ 1 file changed, 220 insertions(+) create mode 100644 libjava/classpath/gnu/java/math/Fixed.java (limited to 'libjava/classpath/gnu/java/math/Fixed.java') diff --git a/libjava/classpath/gnu/java/math/Fixed.java b/libjava/classpath/gnu/java/math/Fixed.java new file mode 100644 index 000000000..6b210deda --- /dev/null +++ b/libjava/classpath/gnu/java/math/Fixed.java @@ -0,0 +1,220 @@ +/* Fixed.java -- Utility methods for fixed point arithmetics + Copyright (C) 2006 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath 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 for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + + +package gnu.java.math; + +/** + * Utility methods for fixed point arithmetics. + */ +public final class Fixed +{ + + /** + * Private constructor to avoid instantiation. + */ + private Fixed() + { + // Forbidden constructor. + } + + /** + * Divides two fixed point values with n digits. + * + * @param n the number of digits + * @param a the first operand as fixed point value + * @param b the second operand as fixed point value + * + * @return a / b as fixed point value + */ + public static int div(int n, int a, int b) + { + return (int) ((((long) a) << n) / b); + } + + /** + * Multiplies two fixed point values with n digits. + * + * @param n the number of digits + * @param a the first operand as fixed point value + * @param b the second operand as fixed point value + * + * @return a * b as fixed point value + */ + public static int mul(int n, int a, int b) + { + return (int) ((((long) a) * b) >> n); + } + + /** + * Returns the ceiling value of a fixed point value a with + * the n digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return ceil(a) as fixed point value + */ + public static int ceil(int n, int a) + { + return (a + (1 << n - 1)) & -(1 << n); + } + + /** + * Returns the floor value of a fixed point value a with + * n digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return floor(a) as fixed point value + */ + public static int floor(int n, int a) + { + return a & -(1 << n); + } + + /** + * Truncates the number so that only the digits after the point are left. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the truncated value + */ + public static int trunc(int n, int a) + { + return a & (0xFFFFFFFF >>> 32 - n); + } + + /** + * Returns the round value of a fixed point value a with + * the n digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return round(a) as fixed point value + */ + public static int round(int n, int a) + { + return (a + (1 << (n - 1))) & -(1 << n); + } + + /** + * Returns the fixed point value a with n digits + * as float. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the float value of a + */ + public static float floatValue(int n, int a) + { + return ((float) a) / (1 << n); + } + + /** + * Returns the fixed point value a with n digits + * as double. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the double value of a + */ + public static double doubleValue(int n, int a) + { + return ((double) a) / (1 << n); + } + + /** + * Returns the fixed point value that corresponds to the specified float + * value a with n digits. + * + * @param n the number of digits + * @param a the float value + * + * @return the fixed point value + */ + public static int fixedValue(int n, float a) + { + return (int) (a * (1 << n)); + } + + /** + * Returns the fixed point value that corresponds to the specified double + * value a with n digits. + * + * @param n the number of digits + * @param a the double value + * + * @return the fixed point value + */ + public static int fixedValue(int n, double a) + { + return (int) (a * (1 << n)); + } + + /** + * Returns the integer value of the specified fixed point value + * a. This simply cuts of the digits (== floor(a)). + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the integer value + */ + public static int intValue(int n, int a) + { + return a >> n; + } + + /** + * Returns a fixed point decimal as rounded integer value. + * + * @param n the number of digits + * @param a the fixed point number + * + * @return the fixed point decimal as rounded integer value + */ + public static int roundIntValue(int n, int a) + { + return (a + (1 << (n - 1))) >> n; + } +} -- cgit v1.2.3