Anna Henningsen ab841d5fba lib: add ASCII fast path to getStringWidth() ... A lot of strings that are going to be passed to `getStringWidth()` are ASCII strings, for which the calculation is rather easy and calling into C++ can be skipped. confidence improvement accuracy (*) (**) (***) misc/getstringwidth.js n=100000 type='ascii' *** 328.99 % ±21.73% ±29.25% ±38.77% misc/getstringwidth.js n=100000 type='emojiseq' 2.94 % ±7.66% ±10.19% ±13.26% misc/getstringwidth.js n=100000 type='fullwidth' 4.70 % ±5.64% ±7.50% ±9.76% PR-URL: https://github.com/nodejs/node/pull/29301 Reviewed-By: Gus Caplan <me@gus.host> Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com> Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Luigi Pinca <luigipinca@gmail.com> Reviewed-By: Minwoo Jung <minwoo@nodesource.com> Reviewed-By: Rich Trott <rtrott@gmail.com>		2019-09-02 21:02:34 -07:00
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utils.js