On 12/11/15 13:15, Jan Hubicka wrote:
>> Jan,

>> b) augment can_replace_by_local_alias_in_vtable to check whether
>> aliases can be created?
>
> I think this is best: can_replace_by_local_alias_in_vtable exists to prevent the
> body walk in cases we are not going to create the alias.  This is because in LTO
> we may need to stream in the constructor from the object file that is not copletely
> free and thus it is better to not touch it unless necessary.

I went with augmenting can_replace_by_local_alias, which 
can_replace_by_local_alias_in_vtable calls.  I also noticed that both should be 
static, which  I suspect will encourage the inliner to go inline them and then 
determine a bunch of code is unreachable.

tested on x86-linux and ptx-none.

ok?

nathan