<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/81128>81128</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Opt passes= doesn't work if the first one is a function pass
        </td>
    </tr>

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

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

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

<pre>
    OK:
`opt --passes=inline,instcombine whatever.ll  -S`

Fails:
`opt --passes=instcombine,inline whatever.ll  -S`

unknown function pass 'inline' 

I think if the first pass named is a module pass, putting several in sequence works as expected. If the first is a function pass, it fails to find the later ones. Discovered writing tests for other passes.

This seems unlikely to be intended behaviour, though I can't find documentation for passes= so maybe it was. It's not helpful behaviour.

Ideally one should be able to string a long sequence of comma separated passes together and have them all run, without opt failing to find some passes on some permutations.
</pre>
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