<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64426>64426</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [libc++][test] libcxx/numerics/c.math/constexpr-cxx23-clang.pass.cpp fails on PowerPC targets
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            libc++,
            backend:PowerPC
      </td>
    </tr>

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

    <tr>
      <th>Reporter</th>
      <td>
          amy-kwan
      </td>
    </tr>
</table>

<pre>
    When building libc++ running `check-runtimes`, the following issue is exhibited:
```
Command Output (stdout):
--
$ ":" "COMPILED WITH"
$ "/home/amyk/llvm/community/build/bootstrap/stage1/build/./bin/clang++" "/home/amyk/llvm/community/llvm-project/libcxx/test/libcxx/numerics/c.math/constexpr-cxx23-clang.pass.cpp" "-pthread" "--target=powerpc64le-unknown-linux-gnu" "-nostdinc++" "-I" "/home/amyk/llvm/community/build/bootstrap/stage1/build/include/c++/v1" "-I" "/home/amyk/llvm/community/build/bootstrap/stage1/build/include/powerpc64le-unknown-linux-gnu/c++/v1" "-I" "/home/amyk/llvm/community/llvm-project/libcxx/test/support" "-std=c++26" "-Werror" "-Wall" "-Wctad-maybe-unsupported" "-Wextra" "-Wshadow" "-Wundef" "-Wunused-template" "-Wno-unused-command-line-argument" "-Wno-attributes" "-Wno-pessimizing-move" "-Wno-noexcept-type" "-Wno-atomic-alignment" "-Wno-reserved-module-identifier" "-Wno-user-defined-literals" "-Wno-tautological-compare" "-Wsign-compare" "-Wunused-variable" "-Wunused-parameter" "-Wunreachable-code" "-Wno-unused-local-typedef" "-Wno-local-type-template-args" "-Wno-c++11-extensions" "-Wno-unknown-pragmas" "-D_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER" "-D_LIBCPP_ENABLE_EXPERIMENTAL" "-Werror=thread-safety" "-Wuser-defined-warnings" "-lc++experimental" "-nostdlib++" "-L" "/home/amyk/llvm/community/build/bootstrap/stage1/build/./lib/powerpc64le-unknown-linux-gnu" "-Wl,-rpath,/home/amyk/llvm/community/build/bootstrap/stage1/build/./lib/powerpc64le-unknown-linux-gnu" "-lc++" "-o" "/home/amyk/llvm/community/build/bootstrap/stage1/build/runtimes/runtimes-bins/test/libcxx/numerics/c.math/Output/constexpr-cxx23-clang.pass.cpp.dir/t.tmp.exe"
# command stderr:
ExpandFloatResult #0: t16: ppcf128,i32 = ffrexp t14

fatal error: error in backend: Do not know how to expand the result of this operator!
clang++: error: clang frontend command failed with exit code 70 (use -v to see invocation)
```
Investigation for this issue required.
</pre>
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