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Re: [tree-ssa] copy prop vs. debugging
- From: Richard Henderson <rth at redhat dot com>
- To: Jason Merrill <jason at redhat dot com>
- Cc: "Jeffrey A. Law" <law at redhat dot com>, Andrew MacLeod <amacleod at redhat dot com>, Diego Novillo <dnovillo at redhat dot com>, gcc at gcc dot gnu dot org
- Date: Thu, 3 Jul 2003 09:00:01 -0700
- Subject: Re: [tree-ssa] copy prop vs. debugging
- References: <wvlof0bvdws.fsf@prospero.boston.redhat.com>
On Thu, Jul 03, 2003 at 11:16:35AM -0400, Jason Merrill wrote:
> 1) When coalescing, try to replace temps with user variables which are
> copied from them. This is an incomplete solution, but might be simpler
> than:
That's certainly a start.
> 2) Remember the dead copies, make a list of which temporary holds the value
> of a variable at any given time, and feed this list to the debugging
> backend.
This actually sounds something like the partial support we have
for location lists at the rtl level.
> Thoughts? Is there any live range splitting code in gcc these days?
Not as such, but I guess it depends on what you mean by that.
r~