https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91289
--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> --- The prologue is not necessarily inserted as the first bb, so it's not clear to me that CA is never live there. The code copying r11 to r0, and back, is removed by the usual optimisations btw, in all normal cases.
