[Bug tree-optimization/33649] New: cc1 segfaults when multiple tree opts disabled

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

Every test in SPEC CPU2000 causes cc1 to segfault when built with:

  -O2
  -fno-tree-ch
  -fno-tree-copy-prop
  -fno-tree-dominator-opts
  -fno-tree-store-copy-prop
  -fno-tree-vrp

Yes, a normal person wouldn't do that, but in theory we'd like the optimization
passes to not rely on each other.  Minimizing a test case proved to be
frustrating because even a change in whitespace could cause a compile to
suddenly succeed.  The following tests in gcc/testsuite/gcc.dg fail in the same
way with these options for powerpc-linux.  I tried one of them with 24 cross
cc1s and most failed in the same way.

  20000906-1.c
  20020122-2.c
  20020426-2.c
  20040916-1.c
  20050111-2.c
  20050702-1.c
  20070507-1.c

The failure is in tree-ssa-pre.c:2002 with i=20, postorder[i]=283741360.


-- 
           Summary: cc1 segfaults when multiple tree opts disabled
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: janis at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33649