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From: "gpib at rickyrockrat dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/50695] New: double comparison broken after computation
Date: Tue, 11 Oct 2011 02:24:00 -0000 [thread overview]
Message-ID: <bug-50695-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50695
Bug #: 50695
Summary: double comparison broken after computation
Classification: Unclassified
Product: gcc
Version: 4.4.3
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: gpib@rickyrockrat.net
1e-6*1e6 != 1
The following minimal code segment fails (compile with gcc -o x x.c):
#include <string.h>
int main(int argc, char *argv){
double x,y;
x=strtof(",+1.00000E-06,",NULL);
y=1000;
y*=1000;
if(x*y!=1)
printf("Bug!!\n");
else printf("Nobug\n");
}
gcc -v
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
Also fails with:
Using built-in specs.
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 4.4.3-4ubuntu5'
--with-bugurl=file:///usr/share/doc/gcc-4.4/README.Bugs
--enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr --enable-shared
--enable-multiarch --enable-linker-build-id --with-system-zlib
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--with-gxx-include-dir=/usr/include/c++/4.4 --program-suffix=-4.4 --enable-nls
--enable-clocale=gnu --enable-libstdcxx-debug --enable-plugin --enable-objc-gc
--disable-werror --with-arch-32=i486 --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.4.3 (Ubuntu 4.4.3-4ubuntu5)
next reply other threads:[~2011-10-11 2:24 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-10-11 2:24 gpib at rickyrockrat dot net [this message]
2011-10-11 8:54 ` [Bug c/50695] " rguenth at gcc dot gnu.org
2011-10-11 8:59 ` rguenth at gcc dot gnu.org
2011-10-11 9:11 ` schwab@linux-m68k.org
2011-10-11 12:24 ` marc.glisse at normalesup dot org
2011-10-11 19:05 ` gpib at rickyrockrat dot net
2011-10-11 19:06 ` gpib at rickyrockrat dot net
2011-10-11 19:25 ` gpib at rickyrockrat dot net
2011-10-11 19:34 ` gpib at rickyrockrat dot net
2011-10-11 19:39 ` gpib at rickyrockrat dot net
2011-10-12 11:35 ` rguenth at gcc dot gnu.org
2011-10-12 17:40 ` gpib at rickyrockrat dot net
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