This discussion has been locked.

You can no longer post new replies to this discussion. If you have a question you can start a new discussion

Arm NEON not able to understand the cycles?

Note: This was originally posted on 25th March 2013 at http://forums.arm.com

I am working on optimizing the code for FFT algorithm using NEON of ARM. I am running Beagle Board xM as target. I am running my program without any operating system on the board(Running program directly on the board). The board is supposed to be run at 1Ghz, I am not where operating near to that frequency. Currently I am facing difficulties regarding basic understanding of NEON. Anyone please help me with the things.

The following are sample programs I ran. LOOP CODE:

Loop Unrolled code:

The following are the results I ran for different frequencies

[size=2]T [/size]
[font="Arial,"][font="Arial,"]The above does not make any sense, Different cycles per instructions at different frequencies.?[/font][/font]

Parents

wolfrum aurum over 12 years ago

Note: This was originally posted on 2nd April 2013 at http://forums.arm.com

Thanks for the inputs I was able to achieve considerable performance till now. I am happy with the performance. Please just "glance" through the code at https://code.google.com/p/neon-fft/downloads/detail?name=NE10_cfft.neon1.s&can=2&q= . I don't want you to understand the algorithm. If possible please give any general suggestions for optimization(Like the alignment in instruction which was very useful ).
Cancel
Vote up 0 Vote down

Cancel

Reply

wolfrum aurum over 12 years ago

Note: This was originally posted on 2nd April 2013 at http://forums.arm.com

Thanks for the inputs I was able to achieve considerable performance till now. I am happy with the performance. Please just "glance" through the code at https://code.google.com/p/neon-fft/downloads/detail?name=NE10_cfft.neon1.s&can=2&q= . I don't want you to understand the algorithm. If possible please give any general suggestions for optimization(Like the alignment in instruction which was very useful ).
Cancel
Vote up 0 Vote down

Cancel

Children

No data