https://community.intel.com/t5/Intel-ISA-Extensions/int64-data-types/m-p/820706#M1127 what header files are used for __int64 data types? where can i get the intrinsic instructions for __int64? Sun, 19 Sep 2010 05:19:34 GMT Smart_Lubobya 2010-09-19T05:19:34Z https://community.intel.com/t5/Intel-ISA-Extensions/int64-data-types/m-p/820706#M1127 what header files are used for __int64 data types? where can i get the intrinsic instructions for __int64? Sun, 19 Sep 2010 05:19:34 GMT https://community.intel.com/t5/Intel-ISA-Extensions/int64-data-types/m-p/820706#M1127 Smart_Lubobya 2010-09-19T05:19:34Z https://community.intel.com/t5/Intel-ISA-Extensions/int64-data-types/m-p/820707#M1128 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 <STDINT.H>. <BR />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.<BR />Other proprietary compilers, such as CL, have their own intrinsics.</STDINT.H> Sun, 19 Sep 2010 10:42:07 GMT https://community.intel.com/t5/Intel-ISA-Extensions/int64-data-types/m-p/820707#M1128 TimP 2010-09-19T10:42:07Z