[Bug target/67391] [SH] Convert clrt addc to normal add insn

[kkojima at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67391

--- Comment #3 from Kazumoto Kojima <kkojima at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #1)
> Kaz, do you have any memory of the extra checks?  Isn't it enough to just
> accept the addsi3 pattern as "rC = rA + {rB|imm}" and insert the reg-reg
> copy after register allocation via split2, as it's already done?  Why are
> the reg overlap checks needed during matching of the patterns?

Ugh, those checks look just wrong and I can't remind why I've
added them.  33707 didn't do that and checked overlapping at
the split condition only.  Perhaps I mixed up the final patch
with the one of test codes to collect CSiBE results.  You can
install the above patch as the rather obvious one, though I'm
running "make -k check" on sh4-unknown-linux-gnu.  Sorry for
adding that thinko.