https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122266
--- Comment #5 from Roger Sayle <roger at nextmovesoftware dot com> --- The last_set_sign_bit_copies field in combine.cc is "char" which overflows for 128-bit TImode, on platforms where char is default signed. I can't be sure but a negative value in this field (probably) leads to bad things happening.
