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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

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

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wolfrum aurum over 12 years ago
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wolfrum aurum over 12 years ago
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