Package: cacao
Version: 0.94-1
Severity: normal
With the following program:
public class test {
public static void main(String[] args) throws Exception {
test t = new test();
t.doTest();
}
volatile double x, y, z, d;
public void doTest() {
x = 9007199254740994.0; /* 2^53 + 2 */
y = 1.0 - 1/65536.0;
z = x + y;
d = z - x;
System.out.println(z = + z);
System.out.println(d = + d);
}
}
I get on an x86 machine:
z = 9.007199254740996E15
d = 2.0
According to the Java specifications, computations must correspond
to the IEEE-754 double precision, and the result is incorrect.
Package cacao 0.93-4 did not have this problem:
z = 9.007199254740994E15
d = 0.0
For more information about this problem under Linux/x86 and various JVMs:
http://www.vinc17.org/research/extended.html
-- System Information:
Debian Release: testing/unstable
APT prefers unstable
APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable')
Architecture: i386 (i686)
Shell: /bin/sh linked to /bin/bash
Kernel: Linux 2.6.14.4-20051215
Locale: LANG=POSIX, LC_CTYPE=en_US.ISO8859-1 (charmap=ISO-8859-1)
Versions of packages cacao depends on:
ii binutils 2.16.1cvs20060117-1 The GNU assembler, linker and bina
ii classpath2:0.20-2clean room standard Java libraries
ii classpath-common 2:0.20-2architecture independent files
ii libc62.3.5-12GNU C Library: Shared libraries an
ii libltdl3 1.5.22-2A system independent dlopen wrappe
ii zlib1g 1:1.2.3-9 compression library - runtime
cacao recommends no packages.
-- no debconf information
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