| Issue |
71330
|
| Summary |
Wrong code at -O3 on x86_64-linux_gnu since 0289dad (recent regression)
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
shao-hua-li
|
clang at -O3 produces the wrong code.
Bisected to 0289dad538fa2fdc1a82a26f5d19f94fbd20d949, which was committed by @goldsteinn
Compiler explorer: https://godbolt.org/z/dhWWer8Gx
```console
% cat a.c
int printf(const char *, ...);
char a, e = 5, g, k, l;
short b, n;
int m, o, p, s;
long c;
unsigned short(q)(short d) { return d + b; }
int r(int *f) {
if ((f[0] & 8) == 0)
return 0;
if ((f[0] & 12) == 0)
return 1;
if ((f[0] & 14) == 0)
return 2;
if (f[0] & 15)
return 3;
return 1;
}
int fn3(int h) {
int i[] = {h};
int j = r(i);
return j;
}
void t() {
int *u = &m;
for (; s;)
for (; p;)
;
m = -3;
for (; m <= -1; m = q(m)) {
for (; fn3(*u + 8) + e + 9 + c < 15; ++c) {
k++;
n = 0;
for (; e + n; ++n)
o = 5 ^ *u;
}
if (n)
l = a;
for (; g; g = a)
;
}
}
int main() {
t();
printf("%d\n", k);
}
%
% clang -O0 a.c && ./a.out
1
% clang -O3 a.c && ./a.out
0
%
```
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