https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94467
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Either one has to replace the builtins manually afterwards back with corresponding intrinsics (something I've done e.g. in the PR94460 patch), or one could e.g. creduce on mostly preprocessed source where content of preprocessed #include <x86intrin.h> would be replaced back with the include.