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Re: [tree-ssa] Copy propagation [patch]
- From: Michael Matz <matz at suse dot de>
- To: <law at redhat dot com>
- Cc: Steven Bosscher <s dot bosscher at student dot tudelft dot nl>,Diego Novillo <dnovillo at redhat dot com>, <gcc-patches at gcc dot gnu dot org>
- Date: Mon, 3 Mar 2003 16:52:15 +0100 (CET)
- Subject: Re: [tree-ssa] Copy propagation [patch]
Hi,
On Fri, 28 Feb 2003 law at redhat dot com wrote:
> >You can cut down the copies during SSA form building, but we would still
> >need this as a separate pass to cleanup the garbage that PRE (and later
> >on GVN and VRP) may leave behind.
> Those would be wiped by the register coalescing that should be done as
> part of the translation from SSA back to normal form.
It could arguably also be left to the register allocator.
Ciao,
Michael.