[Bug optimization/13962] New: [tree-ssa] make "fold" use alias information to optimize pointer comparisons

["dann at godzilla dot ics dot uci dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

Given 2 pointers p and q, if the alias information says that p and q 
cannot alias, then comparisons like p == q and p != q can be optimized away.

There are quite a few examples in:

testsuite/gcc.dg/tree-ssa/ssa-ccp-3.c

-- 
           Summary: [tree-ssa] make "fold" use alias information to optimize
                    pointer comparisons
           Product: gcc
           Version: tree-ssa
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: dann at godzilla dot ics dot uci dot edu
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=13962