[Bug c++/40186] floating point comparision works wrong ( !(a < b) && (b > a) is true )

["ich at az2000 dot de" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #3 from ich at az2000 dot de  2009-05-18 13:17 -------
Some compiler information:

az@acompneu ~/Programmierung $ g++ -Os -v -ggdb test_order.cpp -o test_order &&
./test_order
Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: /var/tmp/portage/sys-devel/gcc-4.4.0/work/gcc-4.4.0/configure
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/4.4.0
--includedir=/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/4.4.0
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/4.4.0/man
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/4.4.0/info
--with-gxx-include-dir=/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include/g++-v4
--host=i686-pc-linux-gnu --build=i686-pc-linux-gnu --disable-altivec
--disable-fixed-point --with-ppl --with-cloog --enable-nls
--without-included-gettext --with-system-zlib --disable-checking
--disable-werror --enable-secureplt --disable-multilib --enable-libmudflap
--disable-libssp --enable-libgomp --enable-cld --enable-java-awt=gtk
--with-arch=i686 --enable-languages=c,c++,java,objc,fortran --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--with-bugurl=http://bugs.gentoo.org/ --with-pkgversion='Gentoo 4.4.0'
Thread model: posix
gcc version 4.4.0 (Gentoo 4.4.0) 
COLLECT_GCC_OPTIONS='-Os' '-v' '-ggdb' '-o' 'test_order' '-shared-libgcc'
'-mtune=generic' '-march=i686'
 /usr/libexec/gcc/i686-pc-linux-gnu/4.4.0/cc1plus -quiet -v -D_GNU_SOURCE
test_order.cpp -quiet -dumpbase test_order.cpp -mtune=generic -march=i686
-auxbase test_order -ggdb -Os -version -o /tmp/cc2REzjQ.s
ignoring nonexistent directory
"/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../i686-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include/g++-v4
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include/g++-v4/i686-pc-linux-gnu
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include/g++-v4/backward
 /usr/local/include
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/include-fixed
 /usr/include
End of search list.
GNU C++ (Gentoo 4.4.0) version 4.4.0 (i686-pc-linux-gnu)
        compiled by GNU C version 4.4.0, GMP version 4.2.4, MPFR version
2.4.1-p1.
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 13a3af7fd37a02ca6104ed29e33fcca6
COLLECT_GCC_OPTIONS='-Os' '-v' '-ggdb' '-o' 'test_order' '-shared-libgcc'
'-mtune=generic' '-march=i686'
 /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../i686-pc-linux-gnu/bin/as -V
-Qy -o /tmp/cc5XznpU.o /tmp/cc2REzjQ.s
GNU assembler version 2.18 (i686-pc-linux-gnu) using BFD version (GNU Binutils)
2.18
COMPILER_PATH=/usr/libexec/gcc/i686-pc-linux-gnu/4.4.0/:/usr/libexec/gcc/i686-pc-linux-gnu/4.4.0/:/usr/libexec/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/:/usr/lib/gcc/i686-pc-linux-gnu/:/usr/libexec/gcc/i686-pc-linux-gnu/4.4.0/:/usr/libexec/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/:/usr/lib/gcc/i686-pc-linux-gnu/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../i686-pc-linux-gnu/bin/
LIBRARY_PATH=/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../i686-pc-linux-gnu/lib/:/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-Os' '-v' '-ggdb' '-o' 'test_order' '-shared-libgcc'
'-mtune=generic' '-march=i686'
 /usr/libexec/gcc/i686-pc-linux-gnu/4.4.0/collect2 --eh-frame-hdr -m elf_i386
-dynamic-linker /lib/ld-linux.so.2 -o test_order
/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../crt1.o
/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../crti.o
/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/crtbegin.o
-L/usr/lib/gcc/i686-pc-linux-gnu/4.4.0 -L/usr/lib/gcc/i686-pc-linux-gnu/4.4.0
-L/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../../i686-pc-linux-gnu/lib
-L/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../.. /tmp/cc5XznpU.o -lstdc++ -lm
-lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/i686-pc-linux-gnu/4.4.0/crtend.o
/usr/lib/gcc/i686-pc-linux-gnu/4.4.0/../../../crtn.o
wrong ordering 2! 993.747, 993.747
d = 990.91854039579629898
v1 = 1600861594,1600861595
v2 = 1600861596,1600861593
8 chars: 3c7f1bcaf90d8f40
d = 990.91854039579629898
v1 = 5f6b359a,5f6b359b
v2 = 5f6b359c,5f6b3599
8 chars: 3c7f1bcaf90d8f40


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40186