[Bug target/83831] [RX] Unused bclr,bnot,bset insns

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83831

Oleg Endo <olegendo at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-01-28
            Summary|[6/7/8 Regression][RX]      |[RX] Unused bclr,bnot,bset
                   |Unused bclr,bnot,bset insns |insns
     Ever confirmed|0                           |1

--- Comment #2 from Oleg Endo <olegendo at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #0)
> These cases should be emitting the bclr, bnot, bset instructions.  They are
> present in rx.md but I guess the combine pass does not catch them because of
> some reasons.  I assume these patterns used to work at some point in time,
> so this must be some kind of regression.  It's not working on the latest
> supported branch (GCC 6) and trunk (GCC 8).

While working on this issue, I realized that the patterns could have never
worked to the full extent.  There was also a corresponding comment in rx.md. 
So it's not really a regression, but I'll be posting patches for GCC 6 and GCC
7 here in case somebody needs it.