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Optimization of algorithm on ARMCortex A8(using NEON)

Note: This was originally posted on 1st June 2011 at http://forums.arm.com

I am new to code optimization for speed(is the main focus)/memory etc

I am looking out for ,

1. We have the algorithms implemented using floating point operations. As I understand NEON has floating point units & hence we dont have to rewrite the algorithms in fixed points, is there anything like floating point operations are slower than fixed point operations or they are same or any other differences with respect to final CPU load/speed?
2. Do we need to take any special care/special optimization techniques for NEON?
3. I would like to know optimization techniques for ARM Cortex A8 (except using intrinsics

, like cache/memory optimizations), do's & dont's.
4. Keywords/anything else to compiler/linker to instruct RVDS to generate optimized code
5. How can I instruct the complier/linker to use NEON accelarator?
6. Any other guidlines to speed optimization using RVDS & GCC compilers.

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Shervin Emami over 12 years ago

Note: This was originally posted on 4th June 2011 at http://forums.arm.com

And like Etienne said, you should definitely try to use 32-bit Floats rather than 64-bit Floats, because NEON does not support 64-bit floats, so it will be MUCH slower than 32-bit floats or 64-bit fixed-point maths!

Cheers,
Shervin Emami.
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Shervin Emami over 12 years ago

Note: This was originally posted on 4th June 2011 at http://forums.arm.com

And like Etienne said, you should definitely try to use 32-bit Floats rather than 64-bit Floats, because NEON does not support 64-bit floats, so it will be MUCH slower than 32-bit floats or 64-bit fixed-point maths!

Cheers,
Shervin Emami.
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