[Bug tree-optimization/22615] New: [4.1 Regression] ICE in first_vi_for_offset, at tree-ssa-structalias.c:2858

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

Take the following C++ code, with -O1 we ICE right now (This is forwarded from PR 22277 because the 
orginal bug there was fixed):

struct A
{
  char c;
  int i;
};

A a;

struct B
{
  char c, d;
};

union C
{
  A *p;
  B *q;

  C() : p(&a) {}
  char& foo() { return q->d; }
};

void bar() { C().foo() = 0; }

-- 
           Summary: [4.1 Regression] ICE in first_vi_for_offset, at tree-
                    ssa-structalias.c:2858
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P2
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
                CC: dberlin at gcc dot gnu dot org,gcc-bugs at gcc dot gnu
                    dot org
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22615