Re: [trans-mem] make alias oracle understand TM read/writes

[Richard Henderson <rth at redhat dot com>]

On 08/31/2009 01:55 PM, Daniel Berlin wrote:
> Well, for starters, don't put it in the flags.
> What if the trans-mem pass runs (IE passes the gate function) but
> actually does nothing?  If it's in the flags, it will still rebuild
> alias.
> You should return TODO_rebuild_alias from the ipa_tm_execute function
> iff trans-mem actually does something that will break aliasing.

It's probably fine where it is.  Given that the pass is gated by the 
existance of transaction regions, and that we should have eliminated 
empty regions earlier, the chances of there being nothing to transform 
ought to be really pretty small.

That said, Aldy, what Dan is looking for is to return TODO_rebuild_alias 
iff expand_assign_tm makes a change.


r~