[Bug middle-end/77568] [7 regression] CSE/PRE/Hoisting blocks common instruction contractions

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77568

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2016-09-12
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note there are two different issues here.

One for the FMA issue which can/should be solved at the tree level (and that is
a regression).

The other is the CSE, we should be able to uncse (rematization) during register
allocation to reduce register pressure; I think this has been filed already.