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Re: How aggressive is CSE about removing redundant CC sets?

From: Kazu Hirata <kazu at cs dot umass dot edu>
To: weigand at i1 dot informatik dot uni-erlangen dot de
Cc: gcc at gcc dot gnu dot org
Date: Sat, 14 Feb 2004 22:11:23 -0500 (EST)
Subject: Re: How aggressive is CSE about removing redundant CC sets?
References: <20040214.205741.82361262.kazu@cs.umass.edu><200402150227.DAA17568@faui1d.informatik.uni-erlangen.de>

Hi Ulrich,

> The advantage of the last is that it, like the first, is accepted
> by single_set, and thus takes part in many optimization steps
> the second pattern doesn't.  It will be chosen by combine if only
> the result of the comparison is needed.

Now I fully understand your "3 patterns for each instruction" scheme.

Thank you very much!

Kazu Hirata

References:
- Re: How aggressive is CSE about removing redundant CC sets?
  - From: Kazu Hirata
- Re: How aggressive is CSE about removing redundant CC sets?
  - From: Ulrich Weigand

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