<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/100045>100045</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            aarch64: constant with orn is not using the same trick as bic
        </td>
    </tr>

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

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

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

<pre>
    Take:
```
int bic_cst(int a, int c)
{
  int b = 4 & ~c;
  return b;
}

int orn_cst(int a, int c)
{
  int b = 4 | ~c;
  return b;
}
```

Currently bic_cst produces a constant move followed by a `bic` instruction. But orn_cst does not do the same trick for orn instruction and instead has a mvn followed by orr.

Noticed while getting GCC implementing the same trick for both (https://gcc.gnu.org/PR115086) and I thought I would report it here too.
</pre>
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