https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67260
--- Comment #10 from Alexander Monakov <amonakov at gcc dot gnu.org> --- If always using r0 is not an issue, I think it's possible to just use operands[0] (casting it to the right size with subreg:SI, if needed) to avoid using a potentially-reserved hardreg. This would allow to remove the clobber from the pattern altogether. (I also imagine that sh.md could benefit from a rework of call patterns, I don't understand why it's done this way with postreload splits)
