[Bug fortran/88579] New: Calculatiing power of powers of two

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88579

            Bug ID: 88579
           Summary: Calculatiing power of powers of two
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: tkoenig at gcc dot gnu.org
  Target Milestone: ---

After PR 85544 has been fixed, there are some optimizations
possible which are detailed in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85544#c13 and
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85544#c10 :

Optimize other powers of two with a general rule involving bit counts,
and also optimizing (-2)**n) and so on.