https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111444
Bug ID: 111444
Summary: Wrong code at -O2/3/s on x86_64-gnu since
r14-3226-gd073e2d75d9
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
CC: mjambor at suse dot cz
Target Milestone: ---
gcc at -O2/3/s produced the wrong code.
Bisected to r14-3226-gd073e2d75d9
Compiler explorer: https://godbolt.org/z/xWj9z8foe
$ cat a.c
int printf(const char *, ...);
int a = 3, d, e;
int *b = &a;
char c;
short f;
const int **g;
static long h(int **i, int **j) {
const int *k[46];
const int **l = &k[5];
*j = &e;
g = l;
for (; d; d = d + 1)
;
**i = 0;
return f;
}
int main() {
int *m = &a;
h(&m, &m);
c = *b;
printf("%d\n", c);
}
$
$ gcc -O0 a.c && ./a.out
3
$ gcc -O2 a.c && ./a.out
0
$
