[Bug c/51023] New: likely integer wrong code bug
regehr at cs dot utah.edu
gcc-bugzilla@gcc.gnu.org
Tue Nov 8 05:54:00 GMT 2011
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51023
Bug #: 51023
Summary: likely integer wrong code bug
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: regehr@cs.utah.edu
Seen on Ubuntu 10.04.3. The "-O0" result is correct.
[regehr@gamow tmp049]$ current-gcc -O0 small.c ; ./a.out
0
[regehr@gamow tmp049]$ current-gcc -O1 small.c ; ./a.out
1
[regehr@gamow tmp049]$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r181147-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.7.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r181147-install
--program-prefix=r181147- --enable-languages=c,c++
Thread model: posix
gcc version 4.7.0 20111108 (experimental) (GCC)
[regehr@gamow tmp049]$ cat small.c
int printf (const char *, ...);
struct {
int f0;
} g_24;
short func_11 (int si1)
{
return si1;
}
int main ()
{
int l_141 = 0x4272A;
g_24.f0 = func_11 (l_141) == l_141;
printf ("%d\n", g_24.f0);
return 0;
}
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