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Re: [patch] tree-ssa-forwprop.c: Rewrite.

From: Jeffrey A Law <law at redhat dot com>
To: Kazu Hirata <kazu at cs dot umass dot edu>
Cc: gcc-patches at gcc dot gnu dot org
Date: Wed, 13 Apr 2005 08:30:00 -0600
Subject: Re: [patch] tree-ssa-forwprop.c: Rewrite.
Organization: Red Hat, Inc
References: <20050406.112000.35816396.kazu@cs.umass.edu> <1113322603.4522.35.camel@localhost.localdomain> <20050412.145910.48531813.kazu@cs.umass.edu>
Reply-to: law at redhat dot com

On Tue, 2005-04-12 at 14:59 -0400, Kazu Hirata wrote:

> Sure.  I was actually thinking about extending this rewritten forwprop
> pass.  Unlike the RTL combiner, GIMPLE doesn't have a lot of
> combinable cases if we want to fold multiple statements into a single
> GIMPLE statement, so for a start, I am thinking about detecting common
> combinable cases like two successive casts and whatnot and let fold do
> its job.
Rather than just extending the existing code, please try to start
factoring it into a more generic tree combiner.

While I agree completely that we're not going to see as many combining
opportunities as we see at the RTL level, the opportunities do exist --
we've had several discussions about them throughout the last two years.

Jeff

References:
- [patch] tree-ssa-forwprop.c: Rewrite.
  - From: Kazu Hirata
- Re: [patch] tree-ssa-forwprop.c: Rewrite.
  - From: Jeffrey A Law
- Re: [patch] tree-ssa-forwprop.c: Rewrite.
  - From: Kazu Hirata

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