From: Richard Henderson <rth@redhat.com>
To: Jeffrey A Law <law@redhat.com>
Cc: Steven Bosscher <stevenb@suse.de>, gcc@gcc.gnu.org
Subject: Re: Delay branch scheduling vs. the CFG
Date: Wed, 16 Nov 2005 20:07:00 -0000 [thread overview]
Message-ID: <20051116200651.GD16133@redhat.com> (raw)
In-Reply-To: <1131917191.3728.357.camel@slowpoke>
On Sun, Nov 13, 2005 at 02:26:31PM -0700, Jeffrey A Law wrote:
> On Sun, 2005-11-13 at 22:20 +0100, Steven Bosscher wrote:
> > On Sunday 13 November 2005 22:02, Jeffrey A Law wrote:
> > > No great insights on how to make dbr_schedule CFG aware -- just
> > > remember that a filled delay slot can represent 3 different cases:
> > >
> > > 1. An extension of the block containing the sequence.
> > >
> > > 2. An extension of the block at the target of a branch.
> > >
> > > 3. An extension of the fall-thru block.
> > >
> > > 4. An entirely new basic block on its own.
> >
> > When can option 4 happen??
> IIRC it occurs when there was only 1 insn in either the target
> or fall-thru block. When it gets sucked into the delay
> slot of a branch, then it is effectively its own basic
> block.
I'd be comfortable modeling all of these as (1), with the
understanding that the delay slots may be conditionally
executed, as if with cond_exec.
r~
next prev parent reply other threads:[~2005-11-16 20:07 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-13 20:20 Steven Bosscher
2005-11-13 21:02 ` Jeffrey A Law
2005-11-13 21:20 ` Steven Bosscher
2005-11-13 21:26 ` Jeffrey A Law
2005-11-16 20:07 ` Richard Henderson [this message]
2005-11-16 23:19 ` Jeffrey A Law
2005-11-16 22:42 Joern RENNECKE
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