Use __SIZEOF_INT128__ to test __int128 presence
Previously we tested whether a handful of preprocessor variables indicating certain 64 bit platforms, but this does not work for other 64 bit targets which have support for __int128 in C compiler. Use the __SIZEOF__INT128__ preprocessor variable instead. This variable gets set to 16 by gcc and clang for every target where __int128 is supported.
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@ -269,7 +269,7 @@ LARGE_INTEGER increment_all_parts(LARGE_INTEGER li) {
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return li;
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}
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#if !(defined(WIN32) || defined(_WIN32) || defined(__WIN32)) && defined(__amd64__)
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#if __SIZEOF_INT128__ == 16
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unsigned __int128 identity(unsigned __int128 a) {
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return a;
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