[Bug tree-optimization/81953] Code sinking increases register pressure

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81953

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |missed-optimization
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2017-08-23
            Summary|Code sinking results in     |Code sinking increases
                   |increased use of callee     |register pressure
                   |saved registers             |
     Ever confirmed|0                           |1

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Part of it is ter.  We should have a simple code motion pass (schedule) that
happens right before expand that reduces register pressure.  I think there are
other bug reports about TER interaction and register pressure too.