[tree-ssa]: Easy way to get default def of a variable?

[Diego Novillo]

On Thu, 2003-06-05 at 12:49, Daniel Berlin wrote:

> I don't know it's a_5, that's the problem.
> Let me be more concrete:
> In this case, we generate saves where we see expression phi operands 
> that have no actual occurrence associated with them yet (IE they need a 
> real expression save to back them up, but a usable one isn't there 
> already).
> Thus, I need to figure out what version to use in the save.
> We do this by walking up the dominator tree, looking for the closest 
> reaching def of the variable.
> If there is none, after hitting the entry block, it must be live on 
> entry, and i need the default def.
> 
Sorry Dan, I'm totally lost.  Could you show the code for the actual
test case you're talking about?  I just don't see what problem you're
trying to solve.


Thanks.  Diego.