[Bug tree-optimization/32073] Loop unrolling does not exploit VRP for loop bound

[rguenth at gcc dot gnu dot org]

------- Comment #1 from rguenth at gcc dot gnu dot org  2007-05-24 22:48 -------
VRP information is not preserved over optimization passes, so loop unrolling
does not know about it.  But VRP recognizes that count is <= 4.


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org, rakdver at gcc dot gnu
                   |                            |dot org
             Status|UNCONFIRMED                 |NEW
          Component|c++                         |tree-optimization
     Ever Confirmed|0                           |1
           Keywords|                            |missed-optimization
   Last reconfirmed|0000-00-00 00:00:00         |2007-05-24 22:48:10
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32073