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<div class="moz-cite-prefix">> Not many people work with either
the machine model or itineraries.<br>
<br>
Andrew's right; not too many people on the list work with the
itineraries It was authored for the Hexagon backend and I believe
the R600 uses it as well.<br>
<br>
How complex are the bundling rules in your VLIW target? Is that
documented somewhere? The complexity will determine whether I'd
recommend using the DFA packetizer.<br>
<br>
-Anshu<br>
<br>
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<br>
On 11/9/2015 2:52 PM, Andrew Trick via llvm-dev wrote:<br>
</div>
<blockquote
cite="mid:CF269106-8801-4F01-ABC5-2CA0E0DC7F14@apple.com"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<br class="">
<div>
<blockquote type="cite" class="">
<div class="">On Nov 9, 2015, at 10:49 AM, Rail Shafigulin
<<a moz-do-not-send="true"
href="mailto:rail@esenciatech.com" class="">rail@esenciatech.com</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div dir="ltr" style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-stroke-width: 0px;" class="">
<div class="gmail_extra">
<div class="gmail_quote">On Mon, Nov 9, 2015 at 10:31
AM, Hal Finkel<span class="Apple-converted-space"> </span><span
dir="ltr" class=""><<a moz-do-not-send="true"
href="mailto:hfinkel@anl.gov" target="_blank"
class="">hfinkel@anl.gov</a>></span><span
class="Apple-converted-space"> </span>wrote:<br
class="">
<blockquote class="gmail_quote" style="margin: 0px 0px
0px 0.8ex; border-left-width: 1px;
border-left-color: rgb(204, 204, 204);
border-left-style: solid; padding-left: 1ex;"><span
class="">----- Original Message -----<br class="">
> From: "Rail Shafigulin via llvm-dev" <<a
moz-do-not-send="true"
href="mailto:llvm-dev@lists.llvm.org" class=""><a class="moz-txt-link-abbreviated" href="mailto:llvm-dev@lists.llvm.org">llvm-dev@lists.llvm.org</a></a>><br
class="">
> To: "llvm-dev" <<a moz-do-not-send="true"
href="mailto:llvm-dev@lists.llvm.org" class="">llvm-dev@lists.llvm.org</a>><br
class="">
> Sent: Monday, November 9, 2015 10:09:07 AM<br
class="">
> Subject: Re: [llvm-dev] Is there a way to
convert between SchedMachineModel and
Itineraries?<br class="">
><br class="">
><br class="">
> Anybody? Does anyone at all know how to do
it?<br class="">
<br class="">
</span>There is no direct conversion. Although they
are similar models, they are different. The strength
of Itineraries lies in modeling pipelines with
complex hazards (especially those that are not fully
pipelined, or have other similar ordering
constraints). SchedMachineModel can't do that.
Unless you need to represent those kinds of
constraints, SchedMachineModel is preferred. We'd
like to move toward using SchedMachineModel for most
things.<br class="">
<br class="">
-Hal<br class="">
</blockquote>
<div class=""><br class="">
</div>
<div class="">Thanks for the reply Hal. I thought my
thread was dead. </div>
<div class=""><br class="">
</div>
<div class="">I was recommended to use
SchedMachineModel for my VLIW, which is what I've
done (it took me a month to learn tblgen and write
the scheduling model and one more month do get my
head around LLVM. My experience with compilers is
limited to a class I took in college a year ago).
The scheduling part seems to be working (at least
this is what my limited testing shows). However
current DFAPacketizer is based on itineraries
(DFAPacketizer.cpp, lines 66-73). I was hoping there
is a way to convert between these two
representations so that I wouldn't have to rewrite
the packetizer. Unfortunately my experience with
compilers is very limited and I still have a lot to
learn. </div>
<div class=""><br class="">
</div>
<div class="">Right now I have two options. In both of
the cases there are significant drawbacks.</div>
<div class="">1. Rewrite the scheduling model using
itineraries. Unfortunately there is very little help
available on this topic, I even asked on the IRC
channel and nobody seems to know how it is done,
since everyone is moving towards the
SchedMachineModel.</div>
</div>
</div>
</div>
</div>
</blockquote>
<div><br class="">
</div>
Not many people work with either the machine model or
itineraries.</div>
<div><br class="">
</div>
<div>Be careful! I think the DFAPacketizer will only be effective
on a very simple itinerary (which could easily have been
expressed in the new machine model instead). I’ve heard stories
of it “blowing up” on large itineraries. I have no direct
experience with it.</div>
<div><br class="">
<blockquote type="cite" class="">
<div class="">
<div dir="ltr" style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-stroke-width: 0px;" class="">
<div class="gmail_extra">
<div class="gmail_quote">
<div class="">2. Write a new packetizer which will use
the SchedMachineModel, however, as I said before, I
have a very limited experience with compilers and
this looks like some major work. I'm not afraid of
it, it is just there is not much information and
help available.</div>
</div>
</div>
</div>
</div>
</blockquote>
<div><br class="">
</div>
<div>This looks like an opportunity for you to learn something
interesting. Generating a state machine from a set of
constraints is fairly straightforward. The only difficultly
lies in limiting the total number of states so you don’t end
up with a giant table. If you were able to express those
constraints in the machine model they must not be too
complicated.</div>
<div><br class="">
</div>
<div>If your state machine is really just modeling the number of
functional units that can be used by a given VLIW bundle, then
you don’t need to generate a state machine at all. All you
need are counters. MachineScheduler can do this for you. It
already has some support for scheduling instruction groups for
a simple in-order machine (without plugging in your own
scheduler at all). Currently, this isn’t fully implemented—it
isn’t modeling multiple functional units per cycle. But that
would be *very* easy to fix and is something I could help
with. It’s just that no one has asked for it.</div>
<div><br class="">
</div>
<div>Andy</div>
<br class="">
<blockquote type="cite" class="">
<div class="">
<div dir="ltr" style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; orphans:
auto; text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; widows: auto; word-spacing:
0px; -webkit-text-stroke-width: 0px;" class="">
<div class="gmail_extra">
<div class="gmail_quote">
<div class=""><br class="">
</div>
<div class="">I would greatly appreciate any help on
this</div>
<div class=""><br class="">
</div>
<div class="">Rail</div>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<br class="">
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<br>
<pre wrap="">_______________________________________________
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</pre>
</blockquote>
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