Re: [Jikesrvm-researchers] Need help inserting method calls

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Thanks for the reply, Mike:

I left out some details earlier so that I don't bore everyone here. :)

So in short what I want to do is create an optimization pass that
parallelizes

certain methods to be run on a graphics card's GPU. Currently my pass is in
SSAinHIR

after the load elimination pass. For example given this program:

 for (int i =3D 0; i < size; i ++) {

a[i] =3D a[i] * a[i];

}

 I want to transform it to someting like this:

 if (centainConditionsAreMet) {

 Program p =3D new GPUProgram();

 p.begin();

 p.appendFloatMult(.....);

 p.end();

 p.execute(a);

} else {

 for (int i =3D 0; i < size; i ++) {

  a[i] =3D a[i] * a[i];

 }

}

 So what I said earlier isn't entirely correct, I don't neccessary remove
the exisiting float_mut in most cases.

Sometimes, a single HIR instruction might need more than one append____
calls as well.

If I use the bcIndex of the orginal instruction in the class file, I'll get
the following error in the VM_OptLinker:

"Unexpected case in VM_OptLinker.resolveDynamicLink case"

 I think this is due to the fact that in the BC stream, the original
instruction is not a method call.

 Any idea of what I should do?

Thanks!

 -Alan

On 5/20/07, Michael Bond <mik...@cs...> wrote:
>
> Hi Alan,
>
> Yeah, it's important to set both a bcIndex and a position (of type
> OPT_InlineSequence) for inserted method calls.  Perhaps you're not settin=
g
> the position correctly?  Just using the old instruction's position will
> likely work.
>
> Are you sure you want the call to my_float_mul to be an InvokeVirtual?
> If my_float_mul is static, which it seems likely to be, then you'll want
> to use InvokeStatic.  Also, InvokeVirtual and InvokeStatic are specific t=
o
> the bytecode.  Are you trying to insert your call in BC2IR?  In my
> experience, this isn't the easiest place to insert code.  You might try
> adding your transformation sometime after the conversion to HIR; for
> example, OPT_ExpandRuntimeServies is often a relatively easy place to
> insert code.
>
> Hope that's helpful.  If you could provide more information about what
> you're trying to do, where in the IR transformation process you're
> performing your pass, and the error(s) you're getting, that might help.
>
> cheers,
> Mike
>
> On Fri, 18 May 2007, Alan Leung wrote:
>
> > Hi all:
> >
> > I think my problem is caused by OPT_Linker and MC Maps. When I am
> inserting
> > my method calls,
> > I am not properly setting the bcIndex of the newly created call
> instruction.
> >
> > For example: In an opt compiler pass, i want to replace all float_mul t=
o
> > InvokeVirtual of "my_float_mul(FF)F".
> > The MC Map would not work properly if I simply set the call's bcIndex t=
o
> > that of the original float_mul's bcIndex.
> >
> > In this case, what should I set the bcIndex to be? Or should I be addin=
g
> > extra entries in the bytecode stream instead?
> >
> > Thanks.
> >
> > -Alan
> >
> >
> > On 5/14/07, Santiago Gala <sg...@ap...> wrote:
> >>
> >> El dom, 13-05-2007 a las 14:08 -0700,
> >> jik...@li... escribi=F3:
> >> > Subject: [Jikesrvm-researchers]  Need help inserting method calls
> >> > To: jik...@li...
> >> > Message-ID:
> >> >         <c24...@ma...>
> >> > Content-Type: text/plain; charset=3D"iso-8859-1"
> >> >
> >> > Hi all:
> >> >
> >> > I am currently writing a opt compiler pass that requires inserting
> >> > some method calls and some loop transformations. However, after
> >> > inserting the calls, all the transformation seems to be undone. I
> have
> >> > a feeling that it fell back to the baseline compiler every time I
> >> > insert my calls.
> >> >
> >> Any exception thrown in your optimizing pass (or later in the
> >> optimization code) will cause the harness to forget the attempt to
> >> optimize and use (or revert to) the baseline version.
> >>
> >> I found that when I was working on the quick compiler on powerPC, a fe=
w
> >> releases ago, but it guess it is still true.
> >>
> >> I'd tell you to debug your code, as it looks like it is throwing
> >> exceptions, and ensure it is working via a debugger.
> >>
> >> Regards
> >> Santiago
> >>
> >>
> >>
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