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[Bug middle-end/80917] missed bit information propagation


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80917

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-05-30
                 CC|                            |rguenth at gcc dot gnu.org
          Component|rtl-optimization            |middle-end
     Ever confirmed|0                           |1

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We don't do conditional bit-tracking, it would be possible to use the CCP code
to track a separate bit lattice in [E]VRP whose propagators are more capable.

On RTL I think we do not track nonzero bits across BBs but I'm not sure.

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