<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/150363>150363</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            clang-20 crashed with address_space attribute at O1 and above. fatal error: error in backend: cannot lower memory intrinsic in address space 256.
        </td>
    </tr>

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

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

    <tr>
      <th>Reporter</th>
      <td>
          iamanonymouscs
      </td>
    </tr>
</table>

<pre>
    clang-20 crashed with `address_space` attribute at `O1` and above.

Compiler explorer (assertion trunk): https://godbolt.org/z/d3bzdvY6o

```
$cat mutant.c
void a(long b) {
 __attribute__((address_space(256))) char *c = 0;
  for (long d = 0; d < b; ++d)
    c[d] = 0;
}
```

```
$clang-20 -O1 mutant.c
clang-20 -O1 mutant.c
fatal error: error in backend: cannot lower memory intrinsic in address space 256
clang-20: error: clang frontend command failed with exit code 70 (use -v to see invocation)
Ubuntu clang version 20.1.8 (++20250708123929+0de59a293f7a-1~exp1~20250708003944.130)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm-20/bin
clang-20: note: diagnostic msg: 
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang-20: note: diagnostic msg: /tmp/mutant-98b0d1.c
clang-20: note: diagnostic msg: /tmp/mutant-98b0d1.sh
clang-20: note: diagnostic msg: 

********************
```
</pre>
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