[Bug target/52898] SH Target: Inefficient DImode comparisons

[olegendo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52898

--- Comment #4 from Oleg Endo <olegendo at gcc dot gnu.org> 2012-04-12 06:19:44 UTC ---
(In reply to comment #3)
> (In reply to comment #2)
> I don't know about their history.  -mcbranchdi is enabled by default,
> though.  See gcc/common/config/sh/sh-common.c:sh_option_optimization_table.

Ah, I see.  Now I'm even more confused than before :)
If -mcbranchdi is enabled by default, I would not expect to see any changes in
the generated code at all in some cases .... 

> Unfortunately, it looks -mcmpeqdi causes many new failures on trunk.

I would propose to deprecate -mcbranchdi and -mcmpeqdi and hard-code the
'enabled' behavior, i.e. remove all the non-mcbranchdi and non-mcmpeqdi code
paths in the back end code (and fixing the fails of course ...)