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Re: [PATCH] Fix 14844/15459/21608: Forward-propagate casts that will collapse

From: Richard Henderson <rth at redhat dot com>
To: Jeffrey A Law <law at redhat dot com>
Cc: Richard Guenther <rguenth at tat dot physik dot uni-tuebingen dot de>, gcc-patches at gcc dot gnu dot org
Date: Tue, 24 May 2005 15:04:27 -0700
Subject: Re: [PATCH] Fix 14844/15459/21608: Forward-propagate casts that will collapse
References: <429309A3.2050000@tat.physik.uni-tuebingen.de> <20050524202151.GB21956@redhat.com> <1116968016.12471.74.camel@localhost.localdomain>

On Tue, May 24, 2005 at 02:53:36PM -0600, Jeffrey A Law wrote:
> >  Forwprop is not the place for this optimization.
> I'm less sure about this.  Ultimately everything in forwprop.c is
> just tree combination (run forward rather than reverse).  At least
> some cases of NOP_EXPR removal clearly fall under the category of
> tree combination.

I was thinking that this was copy-prop with some extra checks
at the substitution point.


r~

Follow-Ups:
- Re: [PATCH] Fix 14844/15459/21608: Forward-propagate casts that will collapse
  - From: Diego Novillo

References:
- [PATCH] Fix 14844/15459/21608: Forward-propagate casts that willcollapse
  - From: Richard Guenther
- Re: [PATCH] Fix 14844/15459/21608: Forward-propagate casts that will collapse
  - From: Richard Henderson
- Re: [PATCH] Fix 14844/15459/21608: Forward-propagate casts thatwill collapse
  - From: Jeffrey A Law

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