[Bug libstdc++/29286] [4.0/4.1/4.2/4.3 Regression] placement new does not change the dynamic type as it should

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

------- Comment #53 from dberlin at gcc dot gnu dot org  2007-05-12 14:29 -------
Subject: Re:  [4.0/4.1/4.2/4.3 Regression] placement new does not change the
dynamic type as it should

On 12 May 2007 11:11:03 -0000, rguenth at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #52 from rguenth at gcc dot gnu dot org  2007-05-12 12:11 -------
> But I get
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00000000006e646f in find_assert_locations (bb=0x2b56e8984480)
>     at ../../trunk/gcc/tree-vrp.c:3193
> 3193      if (flag_delete_null_pointer_checks && POINTER_TYPE_P (TREE_TYPE
> (op)))
> (gdb) call debug_bb (bb)
> ;; basic block 3, loop depth 1, count 0
> ;; prev block 2, next block 4
> ;; pred:       6 [91.0%]  (true,exec)
> ;; succ:       4 [85.0%]  (true,exec) 5 [15.0%]  (false,exec)
> <bb 3>:
> D.926012_14 = D.926053_23;
> <<<change_dynamic_type (struct Loc *) D.926018_15)>>>
> this_16 = __cur_1;
> if (__cur_1 != 0B)
>   goto <bb 4>;
> else
>   goto <bb 5> (<L9>);
>
>
> compiling tramp3d.  Supposedly because we walk all USEs in the stmt and
> find (struct Loc *) which is not exactly a "use".

Probably need to teach tree-ssa-operands that only one of the operands
is really a use.
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286
>
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-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286