https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67260
--- Comment #11 from Oleg Endo <olegendo at gcc dot gnu.org> --- (In reply to Alexander Monakov from comment #10) > 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'm not sure it's a good idea. All the call patterns are written with "=rf" for operand[0], i.e. it could be a floating point register. Under the current ABI all function calls always clobber GP regs r0..r3 though. To avoid more potential r0-spill-failure cases, I'd rather put the explicit r1 clobber. > (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) Do you have anything in particular in mind? I guess some of the things are tied to the way constant/literal pools work on SH.
