fpfmt

The upstream fmtlib dtoa-benchmark integrates uscale (https://fmtlib.github.io/dtoa-benchmark/results/). It uses C code from Russ Cox's original fpfmt repository (https://github.com/rsc/fpfmt/tree/main/bench/uscalec), which is slightly different from the Go code upthread. Zmij and xjb are in a league of their own. Broadly speaking, dtoa first has to find the shortest decimal representation of the floating-point input, and then format that decimal representation into a string. Zmij and xjb pull far ahead of the others mostly by speeding up the second part of that process. uscale is quite good without the stringification, as are many other algorithms. I would say uscale's main strength isn't its speed, but rather its simplicity and, more importantly, the fact that it does both formatting and parsing using a single ~11 KiB table, which no ot

Note that it has the same table of powers of 10: https://github.com/rsc/fpfmt/blob/main/bench/uscalec/pow10.h

> Russ Cox should make a C version of his code. https://github.com/rsc/fpfmt/blob/main/bench/uscalec/ftoa.c