[Bug target/84826] ICE in extract_insn, at recog.c:2304 on arm-linux-gnueabi

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84826

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Oops I think I missed the artificial defs. Then the liveness makes sense.
> Out of curiosity why are all the argument register defined? This function
> for instance does not need 4 argument register.

Historical quirk inherited from the original flow.c I presume.