<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/123605>123605</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Add missing F32->I64 vec_signede, F32->I64 vec_signedo, F32->U64 vec_unsignede, and F32->U64 vec_unsignedo to altivec.h header
        </td>
    </tr>

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

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

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

<pre>
    GCC 15 has removed the __builtin_vsx_xvcvspsxds builtin and replaced the __builtin_vsx_xvcvspsxds builtin with F32->I64 vec_signede/vec_signedo intrinsics.

GCC 15 has also removed the __builtin_vsx_xvcvspuxds builtin and replaced the __builtin_vsx_xvcvspuxds builtin with F32->U64 vec_unsignede/vec_unsignedo intrinsics.

Clang already has the F64->I32 vec_signede/vec_signedo and F64->U32 vec_unsignede/vec_unsignedo intrinsics, but not the F32->I64 vec_signede/vec_signedo or the F32->U64 vec_unsignede/vec_unsignedo intrinsics.

The following functions need to be added to clang/lib/Headers/altivec.h:
- ```vector signed long long vec_signede(vector float a)```: equivalent to __builtin_vsx_xvcvspsxds on big-endian VSX and equivalent to `__builtin_vsx_xvcvspsxds(vec_sld(a, a, 4))` on little-endian VSX
- ```vector signed long long vec_signedo(vector float a)```: equivalent to __builtin_vsx_xvcvspsxds on little-endian VSX and equivalent to `__builtin_vsx_xvcvspsxds(vec_sld(a, a, 4))` on big-endian VSX
- ```vector unsigned long long vec_unsignede(vector float a)```: equivalent to __builtin_vsx_xvcvspuxds on big-endian VSX and equivalent to `__builtin_vsx_xvcvspuxds(vec_sld(a, a, 4))` on little-endian VSX
- ```vector unsigned long long vec_unsignedo(vector float a)```: equivalent to __builtin_vsx_xvcvspuxds on little-endian VSX and equivalent to `__builtin_vsx_xvcvspuxds(vec_sld(a, a, 4))` on big-endian VSX
</pre>
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