https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103302
--- Comment #6 from Alexandre Oliva <aoliva at gcc dot gnu.org> --- https://gcc.gnu.org/pipermail/gcc-patches/2021-December/585963.html appears to no longer hit this error, though I've only inspected the asm output, not tried to run it yet; can anyone confirm?
