https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91838
--- Comment #16 from Andrew Pinski <pinskia at gcc dot gnu.org> --- So the testcase g++.dg/opt/pr91838.C depends on the out come of the discussion at: https://gcc.gnu.org/pipermail/gcc-patches/2023-June/620378.html Which I think is saying this testcase is undefined really.