https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91066
Jakub Jelinek <jakub at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |jakub at gcc dot gnu.org --- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> --- In immintrin.h i stands for Intel, so for non-Intel ISAs it is correct they aren't included. These builtins are in xopintrin.h which is included from x86intrin.h, which is the header that you should include. That is the standard in other compilers too.