[Bug c++/33589] New: [4.3 regression] ICE on valid code at -O2: verify_flow_info failed

[a dot chavasse at gmail dot com]

g++43 -v output:

Using built-in specs.
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc/configure --program-suffix=43 --disable-multilib
--enable-languages=c,c++
Thread model: posix
gcc version 4.3.0 20070929 (experimental) (GCC)

Built from svn trunk, revision 128885


Compiling this with -O2 or -O3 fails with the following message:

verify_flow_info_failed.cpp: In function 'void somefunction()':
verify_flow_info_failed.cpp:29: error: BB 2 last statement has incorrectly set
region
verify_flow_info_failed.cpp:29: internal compiler error: verify_flow_info
failed


struct base
{
        void somemethod() {}
};

struct derived : public base
{
};

struct smartpointer
{
        ~smartpointer()
        {
        }

        operator derived*() const
        {
                return 0;
        }
};

typedef void ( derived::* methodptr_type )();

methodptr_type getmemberptr()
{
        return &derived::somemethod;
}

void somefunction()
{
        smartpointer pObj;
        ( pObj->*getmemberptr() )();
}


-- 
           Summary: [4.3 regression] ICE on valid code at -O2:
                    verify_flow_info failed
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: a dot chavasse at gmail dot com
 GCC build triplet: x86_64-unknown-linux-gnu
  GCC host triplet: x86_64-unknown-linux-gnu
GCC target triplet: x86_64-unknown-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33589