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Cortex-A9 : NEON assembly code is not giving expected performance compared with ARM assembly code

Mohamed Jauhar
Note: This was originally posted on 27th November 2012 at http://forums.arm.com

I am facing one problem, like I have handmade ARM9 assembly code and NEON assembly code. I expected NEON assembly should get 4X % improvement for the speed compared with ARM assembly code. But I could not see that improvement in NEON assembly code.

Can you please explain me what could be the reason?

I am using Cortex-A9 processor and configuration in my Makefile : "CFLAGS=--cpu=Cortex-A9 -O2 -Otime --apcs=/fpic --no_hide_all"

Please let me know is there anything I need to change the make file settings to get NEON performance improvement?
Parents
  • Note: This was originally posted on 22nd March 2013 at http://forums.arm.com

    Yes as I mentioned earlier, you can look into other optimization possibilities such as cache preloading, and/or  designing your code to make better use of cache, and/or using GPU to  perform the operation (eg: GLSL shaders for current hardware or GPGPU  acceleration if you are targeting future systems). Another method is multi-threading if your Cortex-A9 is a multi-core device, but not all algorithms are suited to multi-threading.
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  • Note: This was originally posted on 22nd March 2013 at http://forums.arm.com

    Yes as I mentioned earlier, you can look into other optimization possibilities such as cache preloading, and/or  designing your code to make better use of cache, and/or using GPU to  perform the operation (eg: GLSL shaders for current hardware or GPGPU  acceleration if you are targeting future systems). Another method is multi-threading if your Cortex-A9 is a multi-core device, but not all algorithms are suited to multi-threading.
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