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Re: libgcc: strange optimization

From: Richard Henderson <rth at redhat dot com>
To: Richard Guenther <richard dot guenther at gmail dot com>
Cc: Michael Matz <matz at suse dot de>, Georg-Johann Lay <avr at gjlay dot de>, Ulrich Weigand <uweigand at de dot ibm dot com>, Ian Lance Taylor <iant at google dot com>, Mikael Pettersson <mikpe at it dot uu dot se>, Michael Walle <michael at walle dot cc>, Hans-Peter Nilsson <hp at bitrange dot com>, gcc at gcc dot gnu dot org
Date: Wed, 03 Aug 2011 08:04:59 -0700
Subject: Re: libgcc: strange optimization
References: <201108030911.p739BZri018360@d06av02.portsmouth.uk.ibm.com> <4E3919EA.2080002@gjlay.de> <CAFiYyc0CvvM-q8vUSFxjJMv4PHSLY6FhrOrT9Q29BCh+pm4f0A@mail.gmail.com> <Pine.LNX.4.64.1108031517260.26760@wotan.suse.de> <CAFiYyc169wDA--H-WkZsKGh5LToUANKJDQG_gXi7+7+2q_VnGw@mail.gmail.com>

On 08/03/2011 07:02 AM, Richard Guenther wrote:
> Reserved registers are a no-go (like %esp), either global or local.

Local register variables referring to anything in fixed_regs
are trivial to handle -- continue to treat them exactly as we
currently do.  They won't be clobbered by random code movement
because they're fixed.


r~

References:
- Re: libgcc: strange optimization
  - From: Ulrich Weigand
- Re: libgcc: strange optimization
  - From: Georg-Johann Lay
- Re: libgcc: strange optimization
  - From: Richard Guenther
- Re: libgcc: strange optimization
  - From: Michael Matz
- Re: libgcc: strange optimization
  - From: Richard Guenther

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