| Issue |
179070
|
| Summary |
[clang] Wrong code at -O2/3/s with -march=native on x86_64-linux_gnu
|
| Labels |
clang
|
| Assignees |
|
| Reporter |
zxt5
|
Compiler explorer: https://godbolt.org/z/hhhsK5Mqa
```
$ cat small.c
int printf(const char *, ...);
int a(unsigned b, int c, int d) {
int e = 1;
while (b >> e > d) {
e++;
if (e > c)
return c;
}
return e;
}
#define f() 0
static int g = 141283461;
unsigned char h;
unsigned short i(int *b) { return f(); }
static int k() {
unsigned char *j = &h;
(*j = a(43, g - 141283429, g - 141283456)) < i(&g);
}
int main() {
k();
printf("%d\n", h);
}
$
$ clang-trunk -O2 -march=native small.c && ./a.out
$ 34
$ clang-trunk -O0 -march=native small.c && ./a.out
$ 3
$ clang-trunk -O2 small.c && ./a.out
$ 3
```
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