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lib: add ASCII fast path to getStringWidth() #29301

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lib: add ASCII fast path to getStringWidth() #29301

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addaleax
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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%
Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • commit message follows commit guidelines

@addaleax
lib: add ASCII fast path to getStringWidth()
7e2e2ef 
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%
@nodejs-github-bot nodejs-github-bot added the readline Issues and PRs related to the built-in readline module. label Aug 25, 2019
bnoordhuis
bnoordhuis approved these changes Aug 25, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/25226/

@addaleax addaleax added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Aug 25, 2019
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CI: https://ci.nodejs.org/job/node-test-pull-request/25304/

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Trott commented Sep 3, 2019

Landed in ab841d5

@Trott Trott closed this Sep 3, 2019
Trott pushed a commit that referenced this pull request Sep 3, 2019
@addaleax @Trott
lib: add ASCII fast path to getStringWidth()
ab841d5 
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: #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>
BridgeAR pushed a commit that referenced this pull request Sep 3, 2019
@addaleax @BridgeAR
lib: add ASCII fast path to getStringWidth()
8877b5f 
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: #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>
@BridgeAR BridgeAR mentioned this pull request Sep 3, 2019
Merged
BridgeAR pushed a commit that referenced this pull request Sep 4, 2019
@addaleax @BridgeAR
lib: add ASCII fast path to getStringWidth()
87b8f02 
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: #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>
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@bnoordhuis bnoordhuis bnoordhuis approved these changes

@jasnell jasnell jasnell approved these changes

@Trott Trott Trott approved these changes

@lpinca lpinca lpinca approved these changes

@cjihrig cjihrig cjihrig approved these changes

@JungMinu JungMinu JungMinu approved these changes

@devsnek devsnek devsnek approved these changes

@trivikr trivikr trivikr approved these changes

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@addaleax @nodejs-github-bot @Trott @bnoordhuis @jasnell @lpinca @cjihrig @JungMinu @devsnek @trivikr