[Bug tree-optimization/34416] New: Tree optimization pipeline needs re-tuning

[rguenth at gcc dot gnu dot org]

There are several things that queued up:

 - scalar cleanup after final inlining should be done before
   computing aliasing (basically, re-run what we do for early
   optimization also after final inlining, but at least run
   copyprop, ccp, forwprop and dce)

 - run an early complete loop unrolling pass unrolling _only_
   innermost loops in loop nests (maybe only at -O3, setting
   up of loop info is expensive)

 - run DCE after vectorization, the IL is completely hosed for
   tree based costs otherwise (affects unrolling costs)


-- 
           Summary: Tree optimization pipeline needs re-tuning
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: rguenth at gcc dot gnu dot org
        ReportedBy: rguenth at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34416