| Issue |
64669
|
| Summary |
Wrong code at -O1 and above on x86_64-linux_gnu since f12a556
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
shao-hua-li
|
This is a recent regression. Clang at -O1 and above produced the wrong code.
Bisected to f12a5561b2cbfae384c9a31293938ee2acea79fd, which was committed by @antoniofrighetto
Compiler explorer: https://godbolt.org/z/q4fsW5Ge7
```console
% cat a.c
int printf(const char *, ...);
long a, e;
int b[72];
int c, g, h;
char d;
int main() {
int *f = &b[25], *i = &c;
d = f != i;
e = a * d;
*f = e + d;
printf("%d\n", b[25]);
}
%
% clang-f12a556 -O0 a.c && ./a.out
1
% clang-f12a556 -O1 a.c && ./a.out
-1
% clang-f12a556 -O2 a.c && ./a.out
-1
%
```
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