The core of newer methods like yy, xjb and zmij is remarkably simple: https://vitaut.net/posts/2026/yy-dtoa/. Shortest uscale is basically Schubfach or, rather, it's variant called Teju Jagua and has 2-3 wide multiplications compared to 1 for newer methods.
The complexity is optional and comes from squeezing the last few nanoseconds =).
The complexity is optional and comes from squeezing the last few nanoseconds =).