[Bug target/66358] [5/6 Regression] [SH] ICE: in extract_constrain_insn, at recog.c:2232

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66358

--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> ---
There was this idea of doing some sort of pre-reg-alloc or special case
handling for R0 in an SH specific RTL pass before regular RA -- see PR 64785.

One option could be to have a simple version of that pass for GCC 5 to fix this
PR (and maybe several other of this kind).  For GCC 6 we could probably just
add -mno-lra option and make -mlra the default setting.