[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 #59 from dberlin at gcc dot gnu dot org  2007-05-14 05:00 -------
Subject: Re:  [4.0/4.1/4.2/4.3 Regression] placement new does not change the
dynamic type as it should

On 14 May 2007 03:45:25 -0000, ian at airs dot com
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #58 from ian at airs dot com  2007-05-14 04:45 -------
> Created an attachment (id=13551)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13551&action=view)
>  --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=13551&action=view)
> Patch
>
> That test case turns out to be an oversight in my patch to tree-ssa-dce.c.
> Here is the new patch against mainline, which has a one line change to
> tree-ssa-dce.c compared to the old patch.

I believe your tree-ssa-dce part is wrong.

I see no reason for them to be marked always necessary.  They are only
necessary if the result is used, passed somewhere else, etc.

These should be properly marked in the regular course of DCE.

>
>
> --
>
> ian at airs dot com changed:
>
>            What    |Removed                     |Added
> ----------------------------------------------------------------------------
>   Attachment #13543|0                           |1
>         is obsolete|                            |
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29286
>
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-- 


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