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Re: [RFC] Run fast RTL DCE pass at -O0

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: gcc-patches at gcc dot gnu dot org
Date: Sun, 19 Apr 2009 11:44:43 +0200
Subject: Re: [RFC] Run fast RTL DCE pass at -O0
References: <200904181722.40540.ebotcazou@adacore.com> <84fc9c000904190041y26141d9eie02cde7661f28251@mail.gmail.com>

> Is running SSA DCE maybe cheaper?

I think this would break debugging, it's much more aggressive.  But I'll give 
it a whirl and see what happens.

> Doesn't this affect the ability to debug? 

No, it doesn't, only pseudos are DCEd like with flow.c.

> NOPs?

Yes, special NOPs inserted at -O0, they are quite rare.

-- 
Eric Botcazou

Follow-Ups:
- Re: [RFC] Run fast RTL DCE pass at -O0
  - From: Jan Hubicka

References:
- [RFC] Run fast RTL DCE pass at -O0
  - From: Eric Botcazou
- Re: [RFC] Run fast RTL DCE pass at -O0
  - From: Richard Guenther

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