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Re: Minor SSA cleanups
- To: <law at redhat dot com>
- Subject: Re: Minor SSA cleanups
- From: Daniel Berlin <dan at www dot cgsoftware dot com>
- Date: Sun, 24 Jun 2001 16:32:33 -0400 (EDT)
- cc: Richard Henderson <rth at redhat dot com>, <gcc-patches at gcc dot gnu dot org>
On Sun, 24 Jun 2001 law@redhat.com wrote:
> In message <Pine.LNX.4.33.0106222330020.19001-100000@www.cgsoftware.com>you w
> rite:
> > Yes, yes, I know, I was just not completely awake when i wrote that.
> > However, GVN is doing a DFS over the SCC's of the graph. It's just
> > another thing to worry about to keep track of where the new definition is
> > coming from (if it's different than the old defintiion), so I can update
> > some pointer that no other pass but one needs, and that pass can easily
> > compute.
> But in this case you aren't going to be changing the DF, and thus you
> won't need to change the embedded pointer.
>
>
> > If they are specific to one pass, they don't belong in the phi structure,
> > they belong in that pass.
> Actually, thinking about it, this information is not specific to one pass.
Then it's fine, and I have no objection to it, but I think it should be
documented a little better than a single comment in rtl.def.
>
> jeff
>