[Bug rtl-optimization/34503] Issues with constant/copy propagation implementation in gcse.c

[steven at gcc dot gnu dot org]

------- Comment #1 from steven at gcc dot gnu dot org  2007-12-17 08:20 -------
Local const/copy propagation uses cselib, which is too heavy-weight for
something this simple.  The reason for using cselib is that, at the time, we
also tried to do local CSE with cselib.  But this never worked and we ended up
with cselib for just recording constants and copies.  This could be done much
more efficiently with a simple mapping of registers to constants and copies.


-- 

steven at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
   Last reconfirmed|0000-00-00 00:00:00         |2007-12-17 08:20:21
               date|                            |
            Summary|Issues with constant/copy   |Issues with constant/copy
                   |propagation implementation  |propagation implementation
                   |in gcse.c                   |in gcse.c


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34503