I sat down and measured the power consumption of the NEON unit on an
OMAP3.  Method and results are here:
 https://wiki.linaro.org/MichaelHope/Sandbox/NEONPower

The board takes 2.37 W and the NEON unit adds an extra 120 mW.
Assuming the core takes 1 W, then the code needs to run 12 % faster
with NEON on to be a net power win.

Note that the results are inaccurate but valid enough.

-- Michael

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