<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/112093>112093</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Need `.td`s for libm and runtime libcall API for ~all LLVM targets
        </td>
    </tr>

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

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

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

<pre>
    This was raised as a concern in https://github.com/llvm/llvm-project/pull/111269 and I am opening an issue to make sure it is not lost as a desired followup.

Basically, there are two contending needs for a list of libm functions:
- Frontends want to know what builtin functions LLVM will need to call at runtime
- LLVM wants to keep track of actual calls to libm functions for LTO purposes

Frontends see RuntimeLibcalls.def as suiting the former, but LLVM has lately grown some... appropriations of the `.def` as the latter. However, RuntimeLibcalls.def is inadequate for the latter, even if it has proven a convenient start. It could use being promoted to a proper TableGen file that can better handle the obviously parameterized cases here.

It might need to be multiple files, given the distinct usages, but hopefully we can avoid complete duplication.
</pre>
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