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[Bug c/44858] New: likely integer wrong code bug
- From: "regehr at cs dot utah dot edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Jul 2010 14:12:07 -0000
- Subject: [Bug c/44858] New: likely integer wrong code bug
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
regehr@john-home:~$ current-gcc -O0 small.c -o small
regehr@john-home:~$ ./small
checksum g_610 = 1
regehr@john-home:~$ current-gcc -O1 small.c -o small
regehr@john-home:~$ ./small
checksum g_610 = 0
regehr@john-home:~$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r161813-install/libexec/gcc/i686-pc-linux-gnu/4.6.0/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r161813-install
--program-prefix=r161813- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20100704 (experimental) (GCC)
regehr@john-home:~$ cat small.c
extern int printf (__const char *__restrict __format, ...);
int g_33 = 3;
int g_610 = 1;
long long foo(int i1, int i2)
{
return (i1 / i2);
}
int main(void)
{
int l_2 = 2;
l_2 &= foo(1, g_610) > g_610;
g_610 = (g_33 != 0) | l_2;
printf("checksum g_610 = %d\n", g_610);
return l_2;
}
--
Summary: likely integer wrong code bug
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: regehr at cs dot utah dot edu
GCC build triplet: i686-pc-linux-gnu
GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44858