[Bug tree-optimization/35272] New: Loop distribution fails to distribute

[irar at il dot ibm dot com]

Loop distribution (from the patch
http://gcc.gnu.org/ml/gcc-patches/2007-12/msg00215.html) fails to distribute
the following loop:

for (i = 2; i <= n; ++i)
 {
   a[i] += c[i] * d[i];
   b[i] = a[i] + d[i] + b[i - 1];
 }

dumping "FIXME: Loop 1 not distributed: failed to build the RDG."

(After distribution the first loop will be vectorizable).


-- 
           Summary: Loop distribution fails to distribute
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: irar at il dot ibm dot com


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=35272