Checksum code implementation for Neon in Intrinsics

Question

I\'m trying to implement the checksum computation code(2\'s complement addition) for NEON, using intrinsic. The current checksum computation is being carried out on ARM.

Answer 1

A few things you can improve:

• Get rid of the stores to disp - this looks like debug code that got left in ?
• Don't do horizontal addition within your main loop - just do partial (vertical) sums in the loop and do one final horizontal addition after the loop (see this answer for an example of how to do this - it's for SSE but the principle is the same)
• Make sure you use gcc -O3 ... to get maximum benefit from compiler optimisation
• Don't use goto ! (Doesn't affect performance but is evil.)