Filed PR jit/66812 for the code generation issue

[David Malcolm]

On Thu, 2015-07-09 at 17:06 -0400, David Malcolm wrote:

(snip)

> The fix will be to implement the LANG_HOOKS_GET_ALIAS_SET internal GCC
> API thus giving libgccjit some rules about aliasing.  Some options:
> 
> (i) make it identical to C.
> (ii) give the client code some control over this
> 
> My initial gut feeling is to go with (i).

...or possibly to do what the link-time optimizer does, which is to use
this internal API:

/* Return the typed-based alias set for T, which may be an expression
   or a type.  Return -1 if we don't do anything special.  */

alias_set_type
gimple_get_alias_set (tree t)

which does almost all of what the C frontend does.  I'll try to cook up
a patch.