From: Jeffrey A Law <law@redhat.com>
To: Richard Henderson <rth@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 23:19:00 -0000 [thread overview]
Message-ID: <1132172698.484.141.camel@fuel98> (raw)
In-Reply-To: <20051116200651.GD16133@redhat.com>
On Wed, 2005-11-16 at 12:06 -0800, Richard Henderson wrote:
> 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.
Seems clean enough to me.
jeff
next prev parent reply other threads:[~2005-11-16 23:19 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
2005-11-16 23:19 ` Jeffrey A Law [this message]
2005-11-16 22:42 Joern RENNECKE
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