__int64 data types

__int64 data types

what header files are used for __int64 data types? where can i get the intrinsic instructions for __int64?

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If you're discussing Microsoft usage, no header is required by ICL (under Windows). For non-Microsoft-compatible compilers, you should change to data types defined in .
If you're trying to sort out which intrinsics from immintrin.h involve 64-bit integers, that's a sore point, it's not organized to make it easy. The organization is somewhat different between open and closed source versions. I don't know that you can do better than the like of grep __m64 *intrin.h in the include directory tied to your compiler. immintrin.h includes all its predecessors.
Other proprietary compilers, such as CL, have their own intrinsics.

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