[Bug middle-end/46076] [4.6 regression] constant propagation and compile-time math no longer happening versus 4.4 and 4.5

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46076

--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> 2010-10-19 
04:42:40 UTC ---
(In reply to comment #6)
> I think both indirect inlining and constant propagation should be able to get
> past the cast especially when there is no type mismatch in the testcase.

Either try with (void) in the function declaration or try using the C++
front-end.  () and (void) are different in C :).