http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52943
Bug #: 52943
Summary: likely wrong code bug
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
[regehr@dyson r23]$ current-gcc -O2 small.c ; ./a.out
0
[regehr@dyson r23]$ current-gcc -O3 small.c ; ./a.out
1
[regehr@dyson r23]$ cat small.c
int printf (const char *, ...);
int a[] = { 0, 0, 0, 6 };
int b;
int
main ()
{
for (;;)
{
b = 3;
for (; b; b -= 1)
a[b] = a[3] > 1;
break;
}
printf ("%d\n", a[1]);
return 0;
}
[regehr@dyson r23]$ current-gcc -v
Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r186359-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r186359-install
--program-prefix=r186359- --enable-languages=c,c++
Thread model: posix
gcc version 4.8.0 20120411 (experimental) (GCC)
