<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/74560>74560</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Support for fixed point arithmetic in libc
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc
      </td>
    </tr>

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

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

<pre>
    [Clang supports fixed point arithmetic](https://groups.google.com/g/llvm-dev/c/PKiQ0szeT8g) which was proposed in [ISO/IEC JTC1 SC22 WG14 N1169](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n1169.pdf). This document also proposes the `stdfix.h` header which introduces:

- [ ] Integer types used for the bits conversion functions
- [ ] Precision macros
- [ ] The `FX_FULL_PRECISION` pragma
- [ ] The fixed-point overflow pragmas
- [ ] Fixed-point arithmetic
  - [ ] The fixed-point arithmetic operation support functions
  - [ ] The fixed-point absolute value functions
  - [ ] The fixed-point rounding functions
  - [ ] The fixed-point `countls` functions
  - [ ] The bitwise fixed-point to integer conversion functions
  - [ ] The bitwise integer to fixed-point conversion functions
  - [ ] Type-generic fixed-point functions
  - [ ] Numeric conversion functions
- [ ] The `fprintf` function conversion specifiers for fixed-point type arguments
- [ ] The `fscanf` function conversion specifiers for fixed-point type arguments

To improve the usability of fixed point arithmetic in Clang, LLVM libc should provide the `stdfix.h` header and implement all the functions declared there.
</pre>
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