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Re: [tree-ssa Too many edges in CFG
On Thu, 2003-05-08 at 11:37, Diego Novillo wrote:
> On Thu, 2003-05-08 at 11:21, Andrew MacLeod wrote:
>
> > That won't be good enough, we're going to need those copy-out operations
> > before all function call locations anyway, so its automatically going to
> > happen before the no-return call. That makes the edge extraneous anyway.
> >
> Of course. My point was that by having these edges, it is easy to
> discover in which blocks we need to insert the copies. We obviously
> have to insert them before the non-returning call.
That is no reason to have an edge in the flow graph. All function-calls
'exit' the function. So we might need copy's at every function location,
returning or not.
I Dont see any reason why we need an edge of any sort from a
non-returning call to the exit block. I fail to see how it makes
anything easier. you have to go look for all function calls, this edge
doesn't help that.
Andrew