[Bug tree-optimization/32390] New: tree-ssa-math-opts.c performs too many IL scans

["dnovillo at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

In tree-ssa-math-opts.c we already had a pass to cse sin and cos.  The new
reciprocal sqrt pass is mechanically similar to that one.  It does a linear
scan over the CFG applying these peephole transformations.  This new pass
should not be doing a separate IL scan to do its job.

Perhaps it would be a good idea to do a single scan that calls back to
all these transformations on every statement?  I realize that each pass
requires its own setup and may need to do things a bit differently, but
perhaps we can save ourselves multiple IL scans if we generalize it a bit.


-- 
           Summary: tree-ssa-math-opts.c performs too many IL scans
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dnovillo at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32390