https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109818
--- Comment #23 from Jonathan Wakely <redi at gcc dot gnu.org> --- No, the built-in functions just call the functions defined in libm. GCC doesn't implement them. Look at the code for a call to __builtin_acosh: https://godbolt.org/z/dPf46sKxx
