Faster by the looks of it (87% of the time of the compiled C++ code)
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 6 Sep 2021, at 21:48, Dave Seidel  wrote:
> 
> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> !5% slower or faster?
> 
> On Mon, Sep 6, 2021 at 4:41 PM Michael Gogins  wrote:
> I did an experiment to compare the runtime speed of the same DSP algorithm (a physical model of a guitar) implemented using Csound's "faustgen" opcodes, versus a plugin opcode implemented using Faust's "faust2csound" tool.
> 
> The faustgen version runs about 15% than the compiled C++ version. Of course using the faustgen version assumes that one's computer has both LLVM and an installation of Faust with the LLVM back end.
> 
> Details here: https://github.com/gogins/csound-extended/issues/187.
> 
> Regards,
> Mike
> 
> -----------------------------------------------------
> Michael Gogins
> Irreducible Productions
> http://michaelgogins.tumblr.com
> Michael dot Gogins at gmail dot com
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
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It’s an interesting result, I’d have thought the opposite would be the case, it just shows how much LLVM has
come along.

If we had the resources to do it, a LLVM compiler for UDOs would have been great to have.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 6 Sep 2021, at 21:41, Michael Gogins  wrote:
> 
> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> I did an experiment to compare the runtime speed of the same DSP algorithm (a physical model of a guitar) implemented using Csound's "faustgen" opcodes, versus a plugin opcode implemented using Faust's "faust2csound" tool.
> 
> The faustgen version runs about 15% than the compiled C++ version. Of course using the faustgen version assumes that one's computer has both LLVM and an installation of Faust with the LLVM back end.
> 
> Details here: https://github.com/gogins/csound-extended/issues/187.
> 
> Regards,
> Mike
> 
> -----------------------------------------------------
> Michael Gogins
> Irreducible Productions
> http://michaelgogins.tumblr.com
> Michael dot Gogins at gmail dot com
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here


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For Csound-language UDOs we would need to write a compiler for it. We could
reuse the parser, so it’s possible but it would not be easy. 

My thinking is that it may be possible to first do something that would support arithmetic in init, 
control, and audio rates. I had a sketch for it in my head, based on something I discussed in Italy.  
Once that is working, then start supporting some opcodes like oscillators.

But what you’re saying is something I never thought of before, a just-in-time C/C++ compiler. 
It may be achievable.

========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 6 Sep 2021, at 22:24, Michael Gogins  wrote:
> 
> I also had the thought of LLVM for Csound orchestra code, and also didn't feel that I had the resources to do it.
> 
> One great thing about that though would be cross-platform native speed. In fact I think that would be a really great thing.
> 
> Another approach would be -- just write UDOs in C or C++ and embed them in the Csound orchestra and compile them with LLVM.
> 
> Regards,
> Mike
> 
> -----------------------------------------------------
> Michael Gogins
> Irreducible Productions
> http://michaelgogins.tumblr.com
> Michael dot Gogins at gmail dot com
> 
> 
> On Mon, Sep 6, 2021 at 5:12 PM Victor Lazzarini  wrote:
> It’s an interesting result, I’d have thought the opposite would be the case, it just shows how much LLVM has
> come along.
> 
> If we had the resources to do it, a LLVM compiler for UDOs would have been great to have.
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
> 
> > On 6 Sep 2021, at 21:41, Michael Gogins  wrote:
> > 
> > WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or open attachments unless you recognise the sender and know the content is safe.
> > I did an experiment to compare the runtime speed of the same DSP algorithm (a physical model of a guitar) implemented using Csound's "faustgen" opcodes, versus a plugin opcode implemented using Faust's "faust2csound" tool.
> > 
> > The faustgen version runs about 15% than the compiled C++ version. Of course using the faustgen version assumes that one's computer has both LLVM and an installation of Faust with the LLVM back end.
> > 
> > Details here: https://github.com/gogins/csound-extended/issues/187.
> > 
> > Regards,
> > Mike
> > 
> > -----------------------------------------------------
> > Michael Gogins
> > Irreducible Productions
> > http://michaelgogins.tumblr.com
> > Michael dot Gogins at gmail dot com
> > Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
> 
> 
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another thing to consider it is that (I am supposing) your C++ is gcc and LLVM is a different compiler.
Maybe it’s a little better. A clang++ vs g++ comparison should demonstrate that too.
========================
Prof. Victor Lazzarini
Maynooth University
Ireland

> On 6 Sep 2021, at 21:41, Michael Gogins  wrote:
> 
> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or pen attachments unless you recognise the sender and know the content is safe.
> I did an experiment to compare the runtime speed of the same DSP algorithm (a physical model of a guitar) implemented using Csound's "faustgen" opcodes, versus a plugin opcode implemented using Faust's "faust2csound" tool.
> 
> The faustgen version runs about 15% than the compiled C++ version. Of course using the faustgen version assumes that one's computer has both LLVM and an installation of Faust with the LLVM back end.
> 
> Details here: https://github.com/gogins/csound-extended/issues/187.
> 
> Regards,
> Mike
> 
> -----------------------------------------------------
> Michael Gogins
> Irreducible Productions
> http://michaelgogins.tumblr.com
> Michael dot Gogins at gmail dot com
> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here


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I would argue that such a small difference is probably due to 
compilation flags. llvm can compile to native whereas the faust2csound 
script is really very poorly configured and should not be used for 
anything serious.

On 07.09.21 09:49, Victor Lazzarini wrote:
> another thing to consider it is that (I am supposing) your C++ is gcc and LLVM is a different compiler.
> Maybe it’s a little better. A clang++ vs g++ comparison should demonstrate that too.
> ========================
> Prof. Victor Lazzarini
> Maynooth University
> Ireland
>
>> On 6 Sep 2021, at 21:41, Michael Gogins  wrote:
>>
>> WARNINGThis email originated from outside of Maynooth University's Mail System. Do not reply, click links or pen attachments unless you recognise the sender and know the content is safe.
>> I did an experiment to compare the runtime speed of the same DSP algorithm (a physical model of a guitar) implemented using Csound's "faustgen" opcodes, versus a plugin opcode implemented using Faust's "faust2csound" tool.
>>
>> The faustgen version runs about 15% than the compiled C++ version. Of course using the faustgen version assumes that one's computer has both LLVM and an installation of Faust with the LLVM back end.
>>
>> Details here: https://github.com/gogins/csound-extended/issues/187.
>>
>> Regards,
>> Mike
>>
>> -----------------------------------------------------
>> Michael Gogins
>> Irreducible Productions
>> http://michaelgogins.tumblr.com
>> Michael dot Gogins at gmail dot com
>> Csound mailing list Csound@listserv.heanet.ie https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND Send bugs reports to https://github.com/csound/csound/issues Discussions of bugs and features can be posted here
>
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>          https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

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