[Bug target/65249] unable to find a register to spill in class 'R0_REGS' when compiling protobuf on sh4

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65249

--- Comment #20 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Kazumoto Kojima from comment #19)

Just for my understanding ... at which time does the modified expand pattern
kick in?  Before RA, during RA or after RA?  It's a bit confusing, because
operands[0] is already a hard-reg and operands[1] is supposed to be a pseudo
...