[Bug tree-optimization/30630] New: Trunk GCC hangs while compiling cpu2k6/perlbench at -O2

["grigory_zagorodnev at linux dot intel dot com" <gcc-bugzilla at gcc dot gnu dot org>]

GCC 4.3 compiler revision 121206 goes into infinitive loop while compiling
cpu2k6/perlbench source file regcomp.c at -O2 optimization level on
x86_64-redhat-linux.

GDB attached to cc1 process, gives the hang point:
0x0000000000711bd8 in solve_graph (graph=0xd37150)
    at /home/testbot/bootstrap/009454/src/gcc/tree-ssa-structalias.c:1619
1619        if (!TEST_BIT (ti->visited, i) && find (i) == i)

You can find the minimal reproducer attached. This regression is caused by
"Rewrite of portions of points-to solver" patch
http://gcc.gnu.org/ml/gcc-patches/2007-01/msg01541.html
revision 120931 http://gcc.gnu.org/viewcvs?view=rev&revision=120931


-- 
           Summary: Trunk GCC hangs while compiling cpu2k6/perlbench at -O2
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: grigory_zagorodnev at linux dot intel dot com
  GCC host triplet: x86_64-redhat-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30630