1964738 - Consider using Dragonbox for double-to-string conversion

Status: NEW

(Core :: JavaScript Engine, task, P3)

Description

[Jan de Mooij [:jandem]]

V8 recently imported the Dragonbox library for double to string conversions: https://github.com/jk-jeon/dragonbox

JSC started using this a few years ago.

We're currently using Google's double-conversion library (it's in MFBT) that's based on code in V8. Dragonbox is not a complete replacement for all conversions (IIRC at least Number.prototype.toFixed isn't supported), but it should be faster for the typical double to string conversion.

Thanks to Mayank for pointing us to the V8 change.

Comment 1

[Jan de Mooij [:jandem]]

The WebKit pull request from 2023 mentions JetStream improvements. Not sure if that also applies to JetStream 3 but it's worth investigating.