https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111764
Bug ID: 111764
Summary: Wrong code at -O3 on x86_64-linux-gnu since
r11-5965-g04bff1bbfc1
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Keywords: wrong-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
CC: rguenth at gcc dot gnu.org
Target Milestone: ---
gcc at -O3 produced the wrong code.
Bisected to r11-5965-g04bff1bbfc1
Compiler explorer: https://godbolt.org/z/7vaqadYfP
$ cat a.c
int printf(const char *, ...);
char a;
short b, c;
static short *d = &b, *e = &b;
short(f)(short g, short h) { return g * h; }
int main() {
*e = 2;
a = 1;
for (; a <= 9; a++) {
short *i = &c;
*i = *d = f(*e, *e);
}
printf("%d\n", c);
}
$
$ gcc -O0 a.c && ./a.out
0
$ gcc -O3 a.c && ./a.out
4
%
