[rfc] Expose more tailcall opportunities (PR

[Diego Novillo]

On Wed, Jul 20, 2005 at 01:26:29AM +0200, Steven Bosscher wrote:

> GCC currently doesn't produce a tail call for this, but it could.
> With the attached patch, tree-tailcall can see that even though
> b is addressable, b is not call clobbered.  That means, iiuc, that
> its address doesn't escape either.  Does this patch make sense?
>
Yes.  TREE_ADDRESSABLE + is_call_clobbered ==> address escapes.