<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/63996>63996</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Wrong code at -O1 on x86_64-linux_gnu (recent regression)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          shao-hua-li
      </td>
    </tr>
</table>

<pre>
    This looks like a recent regression. Clang at -O1 produced the wrong code. `opt-bisect-limit` suggests that the issue might be in `Early Tail Duplication on function (main)` 

Compiler explorer: https://godbolt.org/z/48dhr18To

```console
% cat a.c
int printf(const char *, ...);
unsigned a, b, n;
int g, h, j, i, s, t, o;
long k, f, p, u;
short l;
char e, m, v;
static long *q = &p;
int *r;
short(w)(int x) { return a > x ? a : a << x; }
void y(char x) { h = x; }
long *z() {
  *q = 82442021152321478;
  for (; n;)
    for (; o + i; e++) {
      int c;
      if (w(r && v & (e <= t))) {
        long d;
        for (; e;)
          return &f;
 b = 0;
        if (u)
          break;
        p = 0;
 }
    }
  return &k;
}
int main() {
  j = 5;
  for (; j; j--) {
    z();
    for (; b;)
      m = l &= m;
    if (g)
 r = &s;
    else
      *q &= 4294967295;
  }
  y(p >> 56);
 printf("%X\n", h);
}
%
% clang-tk -O0 a.c && ./a.out
0
% clang-tk -O1 a.c && ./a.out
1
% clang-tk -v
clang version 17.0.0 (https://github.com/llvm/llvm-project.git 46333f71f8e0d6444a9b2c9e063aedb83ebb9735)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /zdata/shaoli/compilers/ccbuilder-compilers
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/10
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/9
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/11
Candidate multilib: .;@m64
Selected multilib: .;@m64
%
```
</pre>
<img width="1px" height="1px" alt="" src="http://email.email.llvm.org/o/eJy0Vk2PozgT_jXOpQSCMhA45JBOhlfvaQ7b0u5tZMABdzt21jbd6fn1q4J8d2uklWYjVDGuqofHT_lLeK96I-WK5U8s3y7EGAbrVn4QNhpGEWm1aGz3sXoelAdt7asHrV4lCHCylSaAk72T3itrYthoYXoQAaLvKRyc7cZWdhAGCe_Omh5a28kYWJHYQ4ga5WUbIq32KrAiAT_2vfTBQxhEmJKU96OEveqHAI0EZSj1m3D6A56F0rAdD1q1IihrwBrYjaad2gzLvVCGYUW4LNmyZD3bjd0flJYO5PGgrZOO8TUMIRw842uGNcO6t11jdYit6xnWPxnWWdkNLi2f7S0SK5L5aa3xVstTL-bQigAibucOZQIcnDJhx7Ck0ADtIBwwXDPcQBzHxJI_zdGjmYrRgSBnQ8ZcnATVU9dA5oWMIuPJBDL2EqtJ7Vfq25E5kBkvXj9YF0Bf3idGkmL2ZN6ugUEE1cKExnD9NzC-BYbF4Y4Uw7W7x2ZYvtO4sCT_kWEFbPkETobRGRDA-Dc4AuP11F5PdsP4Bo6MPwFbbmesN6s6-CDhiOAFZpho3IeeKf5kWJ7iZgdciZeYZZhgmubIMc2W5YU0wM5STahnVhyrs-fOZ4HhEyhqSoZP03P3MfrRmNsb7KlvB7MoJWEVDAt4owb1ynn0WypiNT-PkDDXoHtAveMmH3nPv5PoDIvdNbuZBEk-wc00xy9gGifF66f4wyPOpSDkvXm5sriCXNwk2LxgH2v3MuHnXxfqZTJR9Emv0yS4Y3uT13wWaj99R0-l4VvY36XOovTXFHdeB_4uTmovb0HniTcjZlhlVbHE6nYsN_rQLCcxv9HSyIs79pf9gyEyzP9i-cZMzWkrqD7ryTC_2Y5oT47CK0TfE9qXztMvZliL2I5hDk2-zEh_kZF-lfF22lGmg-BNOjoXIF3GSZyQiA9brQrD2MSt3TOstX47_0UHZ19kG-JeBcgKzvlume5KmXRFlmWiarCtZFJwIbum5LJpqiXPL-V5Fq6XgbaVY1n8KLJoNK_GvptIKzMeo96Mp7jBSdHB3nZSU_TBenWcXf83PgitZbdV0wlBB0EngmBY08GoFcO6PR0lntptMyrdSRddeyeg2o6mg1aYTnUiSPjfZgNqBp-OrRP46B0NXTUkStsyrE_Ur5SxTpP_ADP9_ZinMvwhtWyD7H4Lv82F2X7UQVEWX0NMUz9L9kX28MlfBV0Xx_kEX3Qr3lW8Egu5SouyqpCnabUYVi1Ped4UedJkTVc1XcnLpip5uqs63vGiWKgVJsiTJabJMsnTKha4ExViUbWFxF26Y1ki90LpmKY1XSkW051mVfCqKhZaNFL76eaFaOT7fOGhpZ1vF241LYVm7D3LEq188FeUoIKWqz8vl6rzncsauFXxR29GWnafrmoMq8Xo9OrfrUeG9cSQpvw0gn8CAAD__yzP0-U">