http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58365
Bug ID: 58365
Summary: likely wrong code bug
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: regehr at cs dot utah.edu
CC: chenyang at cs dot utah.edu
regehr@john-home ~/z/reduce/r109 $ clang -O small.c ; ./a.out
0
regehr@john-home ~/z/reduce/r109 $ gcc -O small.c ; ./a.out
0
regehr@john-home ~/z/reduce/r109 $ gcc -Os small.c ; ./a.out
1
regehr@john-home ~/z/reduce/r109 $ cat small.c
int printf(const char *, ...);
struct x0 {
volatile int x1;
int x2;
int x3;
int x4;
int x5;
} x6;
static struct x0 x7, x8;
int x9 = 1;
char x10();
static struct x0 x11() {
if (x10())
return x6;
return x7;
}
char x10() { return x9; }
int main() {
x8 = x11();
x6.x2 = 1;
printf("%d\n", x8.x2);
return 0;
}
regehr@john-home ~/z/reduce/r109 $ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/home/regehr/z/compiler-install/gcc-r202341-install/libexec/gcc/x86_64-unknown-linux-gnu/4.9.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/regehr/z/compiler-source/gcc/configure
--prefix=/home/regehr/z/compiler-install/gcc-r202341-install
--enable-languages=c,c++ --disable-multilib
Thread model: posix
gcc version 4.9.0 20130906 (experimental) (GCC)
regehr@john-home ~/z/reduce/r109 $
