id	summary	reporter	owner	description	type	status	priority	milestone	component	resolution	keywords	cc	phab_field
2109	Optimisation of Fixed Point Trigonometic Approximations	Thanduel	Thanduel	"The algorithm currently used in the atan2_aprox has a very large error term for its performance.

To improve it I suggest the use of a CORDIC algorithm.  A CORDIC algorithm calculates the angle by working out, through a binary search of precomputed values, what angle rotation would reduce the original angle to zero.  All the numerical operations are done in power of 2 operations. 

This should at least double the performance for a slightly smaller error (3.576deg vs 4.5deg) term or give slightly faster performance for a sub 0.5 deg error term.

The algorithm currently used in the SIN and COS approximation is very accurate but very slow. I propose to improve this with a CORDIC algorithm as well.  For slightly worse accuracy the performance would be about double."	enhancement	new	Should Have	Backlog	Core engine		Fixed Point Optimisation