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clang/docs/ReleaseNotes.rst

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C++ Language Changes in Clang C++ Language Changes in Clang
----------------------------- -----------------------------
- Improved ``-O0`` code generation for calls to ``std::move``, ``std::forward``, - Improved ``-O0`` code generation for calls to ``std::move``, ``std::forward``,
``std::move_if_noexcept``, ``std::addressof``, and ``std::as_const``. These ``std::move_if_noexcept``, ``std::addressof``, and ``std::as_const``. These
are now treated as compiler builtins and implemented directly, rather than are now treated as compiler builtins and implemented directly, rather than
instantiating the definition from the standard library. instantiating the definition from the standard library.
C++14 Feature Support
^^^^^^^^^^^^^^^^^^^^^
- Sized deallocation is enabled by default in C++14 onwards.
C++20 Feature Support C++20 Feature Support
^^^^^^^^^^^^^^^^^^^^^ ^^^^^^^^^^^^^^^^^^^^^
- Diagnose consteval and constexpr issues that happen at namespace scope. This - Diagnose consteval and constexpr issues that happen at namespace scope. This
partially addresses `Issue 51593 <https://github.com/llvm/llvm-project/issues/51593>`_. partially addresses `Issue 51593 <https://github.com/llvm/llvm-project/issues/51593>`_.
- No longer attempt to evaluate a consteval UDL function call at runtime when - No longer attempt to evaluate a consteval UDL function call at runtime when
it is called through a template instantiation. This fixes it is called through a template instantiation. This fixes
`Issue 54578 <https://github.com/llvm/llvm-project/issues/54578>`_. `Issue 54578 <https://github.com/llvm/llvm-project/issues/54578>`_.
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