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Disabling NEON & VFPv3 in cmake

Hello all, I have 2 questions:

1.) Is NEON and VFPv3 enabled by default if we don't specify any flags related to them in cmake while building OpenCV4.1?

2.) If my Processor (Cortex A57) supports VFPv4, how can i enable it in cmake? This is dependent on the answer to the first question. (disable v3 then enable v4)

Also can vfpv3/v4 increase performance for typical camera undistortion applications ( to boost frame rate )?

Please reply if you know anything that can be of help. Thanks