https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62018
--- Comment #17 from Iain Sandoe <iains at gcc dot gnu.org> --- (In reply to Francois-Xavier Coudert from comment #16) > (In reply to rguent...@suse.de from comment #15) > > Your example directly calling __addvsi3 should suffice for that. > > I've filed it (radar #18924081), but I don't expect them to fix anything, > because it is an undocumented internal function, supported for backward > compatibility. if it's part of compiler-rt we can just post a patch on llvm-commits and that will eventually percolate through to the system. If it's part of libSystem, then I agree .. they might elect to preserve the status quo. We can still find a way to fix this for GCC tho.