[Bug c++/22321] New: [4.1 Regression] Wrong code with SSA dominator optimizations

[paul dot woegerer at nsc dot com]

The following piece of code triggers a bug in the dominator optimizations.
With -fno-tree-dominator-opts the correct result is given back.

volatile int x;

int main ()
{
  volatile int *vip;
  vip = &x;
  const volatile int *cvip;
  cvip = vip;

  if (vip != cvip) return -1;
  return 0;
}

-- 
           Summary: [4.1 Regression] Wrong code with SSA dominator
                    optimizations
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: paul dot woegerer at nsc dot com
                CC: gcc-bugs at gcc dot gnu dot org
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: crx-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22321