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Re: Faster optimize_mode_switching

From: Richard Henderson <rth at redhat dot com>
To: Jan Hubicka <jh at suse dot cz>
Cc: gcc-pdo at atrey dot karlin dot mff dot cuni dot cz, gcc-patches at gcc dot gnu dot org
Date: Mon, 14 Jan 2002 14:35:00 -0800
Subject: Re: Faster optimize_mode_switching
References: <20020114203758.GC18274@atrey.karlin.mff.cuni.cz> <20020114132522.B9506@redhat.com> <20020114213206.GD22491@atrey.karlin.mff.cuni.cz>

On Mon, Jan 14, 2002 at 10:32:06PM +0100, Jan Hubicka wrote:
> > What we shouldn't do is just leave the live_at_start/end unset.
> 
> Do we really, if we are asked for global update?  I guess each pass
> that clobbers cfg needs to ask for global one.

A global update with start blocks will not change anything 
but the start blocks if the liveness at the beginning of
the start block doesn't change.

r~

Follow-Ups:
- Re: Faster optimize_mode_switching
  - From: Jan Hubicka

References:
- Faster optimize_mode_switching
  - From: Jan Hubicka
- Re: Faster optimize_mode_switching
  - From: Richard Henderson
- Re: Faster optimize_mode_switching
  - From: Jan Hubicka

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