[Bug tree-optimization/24351] [4.1 Regression] ICE in do_simple_structure_copy with some C++ code

[rguenth at gcc dot gnu dot org]

------- Comment #7 from rguenth at gcc dot gnu dot org  2005-10-24 11:55 -------
All of the fixes are wrong.  The only safe thing papering over the problem is
disallowing this case with

Index: tree-ssa-structalias.c
===================================================================
RCS file: /cvs/gcc/gcc/gcc/tree-ssa-structalias.c,v
retrieving revision 2.32
diff -c -3 -p -r2.32 tree-ssa-structalias.c
*** tree-ssa-structalias.c      6 Oct 2005 21:36:52 -0000       2.32
--- tree-ssa-structalias.c      24 Oct 2005 11:54:56 -0000
*************** check_for_overlaps (VEC (fieldoff_s,heap
*** 3033,3038 ****
--- 3033,3041 ----

    for (i = 0; VEC_iterate (fieldoff_s, fieldstack, i, fo); i++)
      {
+       if (lastoffset == -1
+         && fo->offset != 0)
+       return true;
        if (fo->offset == lastoffset)
        return true;
        lastoffset = fo->offset;


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24351