These intrinsics in GCC are in ia32intrin.h header. There are no such file in clang headers. Looking through functions in GCC's ia32intrin.h I found similar ones in Clang's Intrin.h file and other headers included into x86intrin.h. So we could use some file included into x86intrin.h or create a new header and include it into x86intrin.h.
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