diff options
author | doko <doko@138bc75d-0d04-0410-961f-82ee72b054a4> | 2007-06-03 23:18:43 +0000 |
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committer | doko <doko@138bc75d-0d04-0410-961f-82ee72b054a4> | 2007-06-03 23:18:43 +0000 |
commit | 5bf762459121cc397663d22498d62d71fa179ef6 (patch) | |
tree | a9c9e7d91c484d53fe154f9285fc57325572ce50 /libjava/classpath/gnu/java/math/Fixed.java | |
parent | 6d7301dc346a198a89ac987c1008aac09f191ee6 (diff) | |
download | gcc-5bf762459121cc397663d22498d62d71fa179ef6.tar.gz |
libjava/classpath/ChangeLog.gcj:
2007-05-31 Matthias Klose <doko@ubuntu.com>
* javax/management/NotificationBroadcasterSupport.java
(getNotificationInfo): Add cast.
* native/jni/qt-peer/Makefile.am (AM_CXXFLAGS): Add libstdc++ include
directories.
* native/jni/qt-peer/Makefile.in: Regenerate.
libjava/ChangeLog:
2007-06-03 Matthias Klose <doko@ubuntu.com>
* java/io/natFileWin32.cc (setFilePermissions): New (stub only).
_access: Handle EXEC query, stub only.
2007-06-03 Matthias Klose <doko@ubuntu.com>
Merged from classpath:
* gnu/java/nio/SelectorProviderImpl.java: Whitespace merge.
* java/lang/System.java(inheritedChannel): New.
* java/lang/Character.java: Remove stray`;'.
* java/net/MulticastSocket.java: Merged.
* java/text/DateFormatSymbols.java(getInstance): New, comment updates.
* java/text/Collator.java(getInstance): Merged.
* java/util/Calendar.java: New attributes ALL_STYLES, SHORT, LONG.
getDisplayName, getDisplayNames: New.
* java/util/logging/Logger.java: Merged.
* Regenerate .class and .h files.
2007-06-03 Matthias Klose <doko@ubuntu.com>
* java/io/File.java: Merge with classpath-0.95, new method
setFilePermissions, new attribute EXEC.
* java/io/natFilePosix.cc (setFilePermissions): New.
_access: Handle EXEC query.
* classpath/lib/java/io/File.class, java/io/File.h: Regenerate.
2007-06-03 Matthias Klose <doko@ubuntu.com>
Imported GNU Classpath 0.95.
* classpath/Makefile.in,
classpath/native/jni/midi-dssi/Makefile.in,
classpath/native/jni/classpath/Makefile.in,
classpath/native/jni/Makefile.in,
classpath/native/jni/gconf-peer/Makefile.in,
classpath/native/jni/java-io/Makefile.in,
classpath/native/jni/native-lib/Makefile.in,
classpath/native/jni/java-util/Makefile.in,
classpath/native/jni/midi-alsa/Makefile.in,
classpath/native/jni/java-lang/Makefile.in,
classpath/native/jni/java-nio/Makefile.in,
classpath/native/jni/java-net/Makefile.in,
classpath/native/jni/xmlj/Makefile.in,
classpath/native/jni/qt-peer/Makefile.in,
classpath/native/jni/gtk-peer/Makefile.in,
classpath/native/Makefile.in, classpath/native/jawt/Makefile.in,
classpath/native/fdlibm/Makefile.in,
classpath/native/plugin/Makefile.in,
classpath/resource/Makefile.in, classpath/scripts/Makefile.in,
classpath/tools/Makefile.in, classpath/doc/Makefile.in,
classpath/doc/api/Makefile.in, classpath/lib/Makefile.in,
classpath/external/Makefile.in, classpath/external/jsr166/Makefile.in,
classpath/external/sax/Makefile.in,
classpath/external/w3c_dom/Makefile.in,
classpath/external/relaxngDatatype/Makefile.in,
classpath/include/Makefile.in,
classpath/examples/Makefile.in: Regenerate.
* classpath/config.guess, classpath/config.sub,
classpath/ltmain.sh : Update.
* classpath/configure, classpath/depcomp, classpath/missing,
classpath/aclocal.m4, classpath/install-sh: Regenerate.
* gnu/classpath/Configuration.java (CLASSPATH_VERSION): Now 0.95.
* sources.am: Regenerate.
* Makefile.in: Regenerate.
* Update the .class files and generated CNI header files, add new
.class and generated CNI header files.
* Remove generated files for removed java source files:
classpath/gnu/java/net/BASE64.java,
classpath/gnu/java/security/util/Base64.java,
classpath/gnu/java/awt/peer/gtk/GThreadMutex.java,
classpath/gnu/java/awt/peer/gtk/GThreadNativeMethodRunner.java,
classpath/gnu/java/awt/font/autofit/Scaler.java,
classpath/gnu/classpath/jdwp/util/Value.java,
classpath/gnu/javax/net/ssl/Base64.java.
* Remove empty directories.
* Makefile.am(nat_source_files): Add natVMOperatingSystemMXBeanImpl.cc.
* java/lang/Class.java(setAccessible): Merge from classpath.
* java/util/Locale.java: Remove.
* gnu/java/lang/management/VMOperatingSystemMXBeanImpl.java,
gnu/java/lang/management/natVMOperatingSystemMXBeanImpl.cc: New.
* gcj/javaprims.h: Update class declarations.
* scripts/classes.pl: Update usage.
* HACKING: Mention to build all peers.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@125302 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'libjava/classpath/gnu/java/math/Fixed.java')
-rw-r--r-- | libjava/classpath/gnu/java/math/Fixed.java | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/java/math/Fixed.java b/libjava/classpath/gnu/java/math/Fixed.java new file mode 100644 index 00000000000..e0284c329b9 --- /dev/null +++ b/libjava/classpath/gnu/java/math/Fixed.java @@ -0,0 +1,207 @@ +/* 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 <code>n</code> 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 <code>a / b</code> 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 <code>n</code> 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 <code>a * b</code> 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 <code>a</code> with + * the <code>n</code> digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return <code>ceil(a)</code> 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 <code>a</code> with + * <code>n</code> digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return <code>floor(a)</code> as fixed point value + */ + public static int floor(int n, int a) + { + return a & -(1 << n); + } + + /** + * Returns the round value of a fixed point value <code>a</code> with + * the <code>n</code> digits. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return <code>round(a)</code> as fixed point value + */ + public static int round(int n, int a) + { + return (a + (1 << (n - 1))) & -(1 << n); + } + + /** + * Returns the fixed point value <code>a</code> with <code>n</code> digits + * as float. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the float value of <code>a</code> + */ + public static float floatValue(int n, int a) + { + return ((float) a) / (1 << n); + } + + /** + * Returns the fixed point value <code>a</code> with <code>n</code> digits + * as double. + * + * @param n the number of digits + * @param a the fixed point value + * + * @return the double value of <code>a</code> + */ + 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 <code>a</code> with <code>n</code> 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 <code>a</code> with <code>n</code> 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 + * <code>a</code>. 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; + } +} |