[Bug tree-optimization/17528] [4.0 Regression] tree optimization incorrectly optimizes away entire function (incorrect aliasing detection?)

[dnovillo at redhat dot com]

------- Additional Comments From dnovillo at redhat dot com  2004-09-16 22:15 -------
Subject: Re:  [4.0 Regression] tree
	optimization incorrectly optimizes away entire function (incorrect aliasing
	detection?)

On Thu, 2004-09-16 at 18:10, pinskia at gcc dot gnu dot org wrote:
> ------- Additional Comments From pinskia at gcc dot gnu dot org  2004-09-16 22:10 -------
> hmm, DCE is removing a COND_EXPR and some BB for some reason:
>   if (D.19406_5 != 0B) goto <L0>; else goto <L2>;
> 
> I cannot figure out why yet.
>
One of the libstdc++ tests I'm looking at has similar symptoms.  We take
the address of a variable that makes its way into some field in a
structure which we fail to relate in the alias analyzer.

Still not completely sure why the alias sets of the two objects don't
conflict.


Diego.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17528