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Christopher Dykes authored
Summary: These builtins are available on all platforms under GCC, using the instruction directly when available and a fallback implementation otherwise. They are implemented in the builtins portability header for MSVC. Reviewed By: yfeldblum Differential Revision: D5185106 fbshipit-source-id: a58305a6b99eb49bd165876a4a60c512a259b225
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