From: Jim Wilson <wilson@redhat.com>
To: David Edelsohn <dje@watson.ibm.com>
Cc: "Deepak B. Nayak" <deepakbn@csa.iisc.ernet.in>, gcc@gcc.gnu.org
Subject: Re: modulo scheduling for IA64
Date: Mon, 30 Sep 2002 13:00:00 -0000 [thread overview]
Message-ID: <xwu3crri7xp.fsf@tonopah.toronto.redhat.com> (raw)
In-Reply-To: <200209301748.NAA30690@makai.watson.ibm.com>
> The GCC DFA scheduler already has a software-pipelining feature
>which has not been merged into the FSF sources, but which should provide
>modulo scheduling. Why not complete that work?
Actually it is RCSP, Resource Constrained Software Pipelining. It is a good
algorithm, but unfortunately not the right one for IA-64 as I understand it.
This is because RCSP doesn't support register rotation, and modulo scheduling
does. You need to use register rotation on IA-64 if you want the best
performance, and thus modulo scheduling is better for IA-64. RCSP may be
better for all other targets though, since IA-64 is the only target with
register rotation.
Jim
next prev parent reply other threads:[~2002-09-30 19:40 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-30 11:00 Deepak B. Nayak
2002-09-30 11:07 ` David Edelsohn
2002-09-30 12:40 ` Daniel Berlin
2002-09-30 13:00 ` Jim Wilson [this message]
2002-09-30 13:58 ` Vladimir Makarov
2002-09-30 14:21 ` Jim Wilson
2002-09-30 13:59 Robert Dewar
2002-10-01 7:26 Deepak B. Nayak
2002-10-01 12:55 ` Jim Wilson
2002-10-01 12:56 ` Deepak B. Nayak
2002-10-01 13:43 ` Vladimir Makarov
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