From: David Mosberger <davidm@napali.hpl.hp.com>
To: linux-ia64@vger.kernel.org
Subject: Re: Automatically optimizing hand coded assembler
Date: Fri, 18 Mar 2005 04:45:56 +0000 [thread overview]
Message-ID: <16954.23812.563464.146911@napali.hpl.hp.com> (raw)
In-Reply-To: <7848.1111113418@kao2.melbourne.sgi.com>
>>>>> On Fri, 18 Mar 2005 13:36:58 +1100, Keith Owens <kaos@sgi.com> said:
Keith> The code in ia64_syscall_setup has several independent steps
Keith> to execute. Interleaving the instructions from each step by
Keith> hand to avoid empty slots is painful, not to mention error
Keith> prone. Are there any tools available for this task?
Keith> I envisage a tool where the user defines the instructions
Keith> required for each step separately, including the stop bits
Keith> needed for ordering within the individual step. The
Keith> resources used by each step must be disjoint. The user also
Keith> defines sync points, where steps must start, end or join with
Keith> other steps. The tool draws the DAG from the sync points
Keith> then runs down the DAG, picking instructions from each step
Keith> to best fill the slots. The output is all the instructions,
Keith> nicely interleaved to give the minimum number of bundles.
I suggested a project along these lines to a few students a while ago
but unfortunately nothing came out of it. IIRC, Intel at one point
had a "visual assembler" which was doing something similar, but it was
Windows only and I don't know what became of it.
--david
next prev parent reply other threads:[~2005-03-18 4:45 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-18 2:36 Automatically optimizing hand coded assembler Keith Owens
2005-03-18 4:45 ` David Mosberger [this message]
2005-03-18 4:51 ` Matt Chapman
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