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Re: VTA guality assessment: better than -O0 ;-)

From: Eric Botcazou <ebotcazou at adacore dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: gcc at gcc dot gnu dot org, Alexandre Oliva <aoliva at redhat dot com>
Date: Sat, 13 Jun 2009 20:00:35 +0200
Subject: Re: VTA guality assessment: better than -O0 ;-)
References: <orzlccioay.fsf@free.oliva.athome.lsd.ic.unicamp.br> <84fc9c000906130823yd6a6296x947a972c7d2535d5@mail.gmail.com>

> Yes, I don't like -O0 producing worse debug info - what does
> the -O0 -fvar-tracking-assignments results look like?

I'd do the opposite: totally disable VTA at -O0 like we do for -fvar-tracking.
We once tried to enable -fvar-tracking with -O0 at AdaCore and ended up with 
bloated and inferior debug info.  I think we shouldn't need to do anything 
at -O0 apart from sufficiently curbing the code generator to get correct 
naive debug info; the sophisticated stuff should be reserved to -O and above.

-- 
Eric Botcazou

Follow-Ups:
- Re: VTA guality assessment: better than -O0 ;-)
  - From: Richard Guenther
- Re: VTA guality assessment: better than -O0 ;-)
  - From: Jakub Jelinek

References:
- VTA guality assessment: better than -O0 ;-)
  - From: Alexandre Oliva
- Re: VTA guality assessment: better than -O0 ;-)
  - From: Richard Guenther

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