[Bug rtl-optimization/122829] Optimization: Don't waste a call-preserved register if a variable's value can be rematerialized with some small cost

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122829

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ra
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2025-11-24
             Status|UNCONFIRMED                 |NEW
          Component|other                       |rtl-optimization
            Summary|Optimization: Don't waste a |Optimization: Don't waste a
                   |call-preserved register if  |call-preserved register if
                   |a variable's value can be   |a variable's value can be
                   |trivially derived           |rematerialized with some
                   |                            |small cost

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is rematerialization but with a twist. This is almost definitely an NP
complete problem :). So there definitely will be some heurstics.