https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70245
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Though, looking at other spots that are using replace_rtx, e.g. sh and epiphany also use it in define_peephole2, thus post reload, and there are tons of other calls that probably want to use rtx_equal_p instead of x == from.
