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[perl #63304] wrong calculating with floating point
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From:
perlbug-followup
Date:
February 18, 2009 15:54
Subject:
[perl #63304] wrong calculating with floating point
Message ID:
rt-3.6.HEAD-21965-1234958304-440.63304-75-0@perl.org
# New Ticket Created by lexore@gmail.com
# Please include the string: [perl #63304]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=63304 >
This is a bug report for perl from lexore@gmail.com,
generated with the help of perlbug 1.35 running under perl v5.8.8.
-----------------------------------------------------------------
[Please enter your report here]
# perl -d
Loading DB routines from perl5db.pl version 1.28
Editor support available.
Ctrl+D
Enter h or `h h' for help, or `man perldebug' for more help.
Debugged program terminated. Use q to quit or R to restart,
use o inhibit_exit to avoid stopping after program termination,
h q, h R or h o to get additional info.
DB<1> $a = 601; foreach $b (0..9) { $c = $a + $b / 10; print "$c: " . (($c * 100) - ($c * 10 * 10)) . "\n"; }
601: 0
601.1: 0
601.2: 7.27595761418343e-12
601.3: -7.27595761418343e-12
601.4: 0
601.5: 0
601.6: 0
601.7: 7.27595761418343e-12
601.8: -7.27595761418343e-12
601.9: 0
DB<2>
I found this error on:
- on Perl 5.8.8/FreeBSD 7.0 (this machine);
- on Perl 5.8.8/Linux gentoo (kernel 2.6.20-gentoo-r8);
- on Perl 5.8.8/Linux gentoo (kernel 2.4.32-gentoo-r7);
- on Perl 5.10.0/Linux Ubuntu 8.10 (kernel2.6.27-12-generic);
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=critical
---
Site configuration information for perl v5.8.8:
Configured by xore at Tue Sep 30 10:17:21 MSD 2008.
Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
Platform:
osname=freebsd, osvers=7.0-release, archname=i386-freebsd-thread-multi-64int
uname='freebsd rex.elizovo.ru 7.0-release freebsd 7.0-release #0: sat may 17 16:48:34 petst 2008 root@rex.homenet2.amn:usrobjusrsrcsysgennew i386 '
config_args='-sde -Dprefix=/usr/local -Darchlib=/usr/local/lib/perl5/5.8.8/mach -Dprivlib=/usr/local/lib/perl5/5.8.8 -Dman3dir=/usr/local/lib/perl5/5.8.8/perl/man/man3 -Dman1dir=/usr/local/man/man1 -Dsitearch=/usr/local/lib/perl5/site_perl/5.8.8/mach -Dsitelib=/usr/local/lib/perl5/site_perl/5.8.8 -Dscriptdir=/usr/local/bin -Dsiteman3dir=/usr/local/lib/perl5/5.8.8/man/man3 -Dsiteman1dir=/usr/local/man/man1 -Ui_malloc -Ui_iconv -Uinstallusrbinperl -Dcc=cc -Duseshrplib -Dccflags=-DAPPLLIB_EXP="/usr/local/lib/perl5/5.8.8/BSDPAN" -Doptimize=-march=prescott -mtune=prescott -O2 -pipe -msse -msse2 -msse3 -march=prescott -fno-strict-aliasing -Dd_dosuid=define -Ui_gdbm -Dusethreads=y -Dusemymalloc=n -Duse64bitint'
hint=recommended, useposix=true, d_sigaction=define
usethreads=define use5005threads=undef useithreads=define usemultiplicity=define
useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
use64bitint=define use64bitall=undef uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='cc', ccflags ='-DAPPLLIB_EXP="/usr/local/lib/perl5/5.8.8/BSDPAN" -DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include',
optimize='-march=prescott -mtune=prescott -O2 -pipe -msse -msse2 -msse3 -march=prescott -fno-strict-aliasing',
cppflags='-DAPPLLIB_EXP="/usr/local/lib/perl5/5.8.8/BSDPAN" -DHAS_FPSETMASK -DHAS_FLOATINGPOINT_H -fno-strict-aliasing -pipe -Wdeclaration-after-statement -I/usr/local/include'
ccversion='', gccversion='4.2.1 20070719 [FreeBSD]', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags ='-pthread -Wl,-E -L/usr/local/lib'
libpth=/usr/lib /usr/local/lib
libs=-lm -lcrypt -lutil
perllibs=-lm -lcrypt -lutil
libc=, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version=''
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags=' -Wl,-R/usr/local/lib/perl5/5.8.8/mach/CORE'
cccdlflags='-DPIC -fPIC', lddlflags='-shared -L/usr/local/lib'
Locally applied patches:
defined-or
---
@INC for perl v5.8.8:
/usr/local/lib/perl5/5.8.8/BSDPAN
/usr/local/lib/perl5/site_perl/5.8.8/mach
/usr/local/lib/perl5/site_perl/5.8.8
/usr/local/lib/perl5/site_perl
/usr/local/lib/perl5/5.8.8/mach
/usr/local/lib/perl5/5.8.8
.
---
Environment for perl v5.8.8:
HOME=/root
LANG (unset)
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/games:/usr/local/sbin:/usr/local/bin:/root/bin
PERL_BADLANG (unset)
SHELL=/bin/csh
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