[Bug tree-optimization/21407] [4.1 Regression] wrong code with upcast in C++

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-05-10 
14:51 -------
(In reply to comment #4)
> void foo1(void* ptr)
> {
>   ((struct A*)ptr)->a = 0;
> }

Because you just violated C aliasing.  This is unlike C++ where upcasting is 
okay.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21407