https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81426
--- Comment #9 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Sergei Trofimovich from comment #7)
> Not sure if it's the same bug or not, but I get the same error building GHC
"unable to find a register to spill in class 'R0_REGS'"
... kind of errors are all the same type of "bug" -- the old register allocator
of GCC can't deal with the R0 restriction of certain SH instructions well in
some cases.
Unfortunately, there's no simple fix for it that I know of. You can try to use
the new register allocator with the option -mlra on a selective basis, because
it's got its own set of issues on SH.
