<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/114109>114109</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Clang + LLVM-libc Sharing Code for Floating Point Operations
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc,
            floating-point
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          michaelrj-google
      </td>
    </tr>
</table>

<pre>
    Proposed name for this project: Hand-Eye Coordination

This is a tracking issue for the overall effort.

Summary: Clang needs support for math functions on APFloat for two main uses - compile time constant folding, and providing constexpr builtins for libc++. We can't just call the host platform's libc since it may not match the behavior of the libc on the target platform. Based on [Project Hand-In-Hand](https://github.com/llvm/llvm-project/pull/91651) we hope to be able to reuse code from LLVM-libc for this purpose. 

Current TODOs (edit as needed):
- [ ] Create an RFC for this project
  - [ ] Specify the utilities that clang needs, and explain how they're different from the standard libc interface
  - [ ] Explain the potential issues (e.g. runtime rounding modes, fast math)
  - [ ] Propose a design for how this will actually work
- [ ] update this list once we have a design

cc: @AaronBallman @lntue @nickdesaulniers @vonosmas 
</pre>
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