https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94420
--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> --- cprop1 has done LOCAL COPY-PROP: Replacing reg 2 in insn 7 with reg 118 which is wrong: the insn isn't valid after that. But there is nothing that expresses that, the "R" constraint "just" becomes unsatisfiable.
