From Matlab to C / C++ : Improving Perfomance

[pooz]

Hi,

I want to port my Matlab Code to a C / C++ code. What are the essential rules to pay attention to, when creating a ressource-friendly code for real-time application?

For example: How to realize vector operation in C? Should I go with a for-loop and process element by element?

Thanks.
Cheers.

 

[amraldo]

Well,
DO not use the automatic conversion of matlab to C using the mcc command.
Try to use a compiler that supports vectoring like the new gcc versions.
If your performance is not met, we can discuss more about it here in this thread.
--
Amr

 

[pooz]

Hi Amr,

thanks for your reply.
Ok, I will use a new gcc compiler.

I want to implement an audio-application as a VST-Plug-In for real-time processing.
I used to process each element in an array for its own, and increased a pointer in a for loop. But I guess, a vectoring compiler would do it faster, wouldn´t it?

Is there anything else, I shoud think about?

Thanks in advance.
cheers.

 

[amraldo]

Try the vectoring and lets C what we will have.
--
Amr

 

[pooz]

Hi Amr,

do you mean the Vector Extention from GCC?
https://gcc.gnu.org/onlinedocs/gcc-3.4.0/gcc/Vector-Extensions.html

Currently I´v just started implementing and due to the low amount of code I wrote (only some lines) I would like to ask in advance, if the usage of vectoring will be faster than a For-Loop ?

 

[amraldo]

Yes, it will. Are you using a DSP processor?
--
Amr

 

[pooz]

No, I would implement as a VST-Plug-In on a PC using MS Visual Studio (and the shipped compiler)

 

[amraldo]

Sounds interesting, hope when you finish your work to share it with us.
--
Amr

 

[pooz]

The vector extention you mentioned and which I gave a link seems to complicated to me. I will give IT++ (ITPP) a try. It is similar to matlab´s syntax, but with a good speed.

 

[amraldo]

The vector extension is a new thing in gcc.
Anyway, feedback me with your progress.
--
Amr