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For Clang, we just need to define the respective macros, since these built-ins are available in all supported Clang versions (>= 4.0.0, currently)[1]. For MSVC (and possibly other compilers) we use the respective APIs of intsafe.h[2] which are available as of Windows 7/Server 2008 R2. For x86 (and to a lesser extend for ARM64) that should also notably improve performance. [1] <https://releases.llvm.org/4.0.0/tools/clang/docs/LanguageExtensions.html> [2] <https://learn.microsoft.com/en-us/windows/win32/api/intsafe/>
