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Re: Usable flags for tree-ssa-branch?
- From: Diego Novillo <dnovillo at redhat dot com>
- To: Andreas Jaeger <aj at suse dot de>
- Cc: gcc at gcc dot gnu dot org
- Date: Tue, 15 Oct 2002 07:10:02 -0400
- Subject: Re: Usable flags for tree-ssa-branch?
- Organization: Red Hat Canada
- References: <ho7kgkp44z.fsf@gee.suse.de>
On Tue, 15 Oct 2002, Andreas Jaeger wrote:
> I noticed today that -ftree-ssa has been removed and -ftree-ccp is
> used by Diego. I will use that one also on my SPEC tester. What is
> the status of other flags that are usable? Should I add some more?
>
Right now -O2 enables tree-ssa. What it does is trigger the main
analysis passes: flowgraph, data reference finder and SSA. Each
optimization pass needs to be enabled with a different -ftree-XXX
switch (invoke.texi documents the different -ftree passes).
The only pass that is close to working right now is CCP. The
idea is for passes to be enabled at -O2 as we start fixing them.
If you want to enable passes with -ftree-XXX, that's great. The
safest way, however, is to use -O2.
Diego.