Re: [PATCH]: update to df for mainline.

[Bernd Schmidt <bernds_cb1 at t-online dot de>]

Kenneth Zadeck wrote:
> The larger bugs are:
>
> 1) Subregs were handled improperly.  Subreg stores were treated as
> kills rather than mods.  This terminated some def use chains
> prematurely.

One of the maddening things about subregs is that sometimes they're 
kills (generally, lowpart subregs of a single word value, outside a 
strict_lowpart), sometimes they are modifications (single-word subregs 
of a multiword value).

From a cursory glance at your changes it isn't obvious to me how/where 
this is handled.  It would be easier to review them if they were posted 
one patch per fix.


Bernd