[quote user="Alexey Bagaev"]Yes, there is (at least one) an algorithm that can do it in a short way and can be efficiently done on even MSP430G-serices MCUs.[/quote] Unless you are building device which shall be sold in huge quantities (> 1milllion) to save every penny out of CPU and/or battery price, in modern day electronics economy it is not feasible to hand-optimize code. If compiler optimizations does not do the job and software libraries does not help either, then better you just change your CPU to one that meets computation requirements without any tricks. By the way there's fierce competition in low power segment, msp432 is starting so slow that I am afraid it is losing battle
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