Adding Trigonometric Optimizations in GCC › FLUSP - FLOSS at USPWritten on March 26, 2019, last modified on July 19, 2022 When dealing with angle-to-distance conversions, these two calculations may show up: \[\sin(\arctan(x)) \quad \quad \quad \cos(\arctan(x))\] It may look pretty hard to squeeze some performance from these calculations. You have to calculate \(y = \arctan(x)\) first, then calculate the \(\sin(y)\) or \(\cos(y)\), and return. What to do then?
