| Issue |
66176
|
| Summary |
Wrong code at -O2/3 on x86_64 (recent regression since d01aec4)
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
shao-hua-li
|
clang at -O2/3 produced the wrong code.
Bisected to d01aec4c769d50fb92e86decd41d077c94105841, which was committed by @nikic
Compiler explorer: https://godbolt.org/z/9bhhc5rGM
```console
% cat a.c
int printf(const char *, ...);
int a, c;
long b, g;
static int d[1] = {5};
unsigned h;
long *i() {
c = 0;
for (; c <= 2; c++) {
for (;;) {
char e[1] = {97};
char f = *e + c;
if (d[f - 97]) {
int *j[] = {&d[0], &d[0]};
h++;
break;
}
return &b;
}
for (; h <= 2;)
return &g;
}
for (;;)
;
}
int main() {
i();
printf("%d\n", a);
}
%
% clang -O0 a.c && ./a.out
0
% clang -O2 a.c
% ./a.out
(Timeout)
%
```
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