Re: [PATCH 204/236] final.c: Use rtx_sequence

[Jeff Law <law at redhat dot com>]

On 08/15/14 18:56, David Malcolm wrote:
> On Fri, 2014-08-15 at 18:38 -0400, Trevor Saunders wrote:
>
> i.e. back to just a GET_CODE check again (albeit with a new local, of
> the subclass ptr type; I don't know how well our optimizations handle
> that yet: the idea that a local ptr X is either equal to another local
> ptr Y or is NULL.  Does our value-numbering cope with this, where one
> ptr is a subclass of another?).
I'm not sure what you're asking.  If you can give me the gimple I can 
probably answer ;-)

In general the gimple optimizers don't care/know about class 
relationships.   So if the pointers point to the same object, but have 
different types, it's likely we won't optimize away things as well as 
we'd like.
jeff