erotavlas_tu...@libero.it writes: > I read in the manual of GCC the following line: > <x86intrin.h> // new intrinsic header file, it should be included before > using any IA-32/x86-64 intrinsics. > What does it mean? I have to explicitly include this library in my code if I > want to use the intrinsic functions like ssex or mcrc32 etc.
This question would be more appropriate for the mailing list gcc-h...@gcc.gnu.org than for gcc@. The gcc@ mailing list is for discussions related to the development of gcc itself. Please take any followups to gcc-help. Thanks. To answer your question: the <x86intrin.h> header file provides definitions for all intrinsic functions which are relevant to the target processor. The intrinsic functions are the ones with names like _mm_crc32_u8. You are not required to #include <x86intrin.h>. But it is a more reliable mechanism than the older one of remembering that _mm_crc32_u8 is defined in <smmintrin.h>. Ian
