src: use simdutf for one-byte string UTF-8 write in stringBytes by mertcanaltin · Pull Request #61696 · nodejs/node

mertcanaltin · 2026-02-05T19:11:13Z

I use simdutf::convert_latin1_to_utf8_safe for one-byte strings in StringBytes::Write UTF-8 path instead of V8's
WriteUtf8V2.

buffer.write(str, 'utf8') 577% faster

benchmark results:

➜ node git:(mert/simdutf-write-utf8) ✗ node-benchmark-compare ./result.csv
confidence improvement accuracy (*) (**) (***)
buffers/buffer-from.js n=800000 len=100 source='array' 0.57 % ±1.29% ±1.76% ±2.40%
buffers/buffer-from.js n=800000 len=100 source='arraybuffer-middle' 0.40 % ±3.23% ±4.42% ±6.03%
buffers/buffer-from.js n=800000 len=100 source='arraybuffer' -0.22 % ±2.94% ±4.09% ±5.70%
buffers/buffer-from.js n=800000 len=100 source='buffer' -0.20 % ±2.55% ±3.51% ±4.84%
buffers/buffer-from.js n=800000 len=100 source='object' -1.26 % ±3.31% ±4.65% ±6.60%
buffers/buffer-from.js n=800000 len=100 source='string-base64' -0.62 % ±1.37% ±1.88% ±2.57%
buffers/buffer-from.js n=800000 len=100 source='string-utf8' 1.73 % ±2.03% ±2.86% ±4.08%
buffers/buffer-from.js n=800000 len=100 source='string' 1.13 % ±1.52% ±2.09% ±2.86%
buffers/buffer-from.js n=800000 len=100 source='uint16array' 0.54 % ±1.54% ±2.12% ±2.89%
buffers/buffer-from.js n=800000 len=100 source='uint8array' -0.18 % ±1.62% ±2.23% ±3.06%
buffers/buffer-from.js n=800000 len=2048 source='array' 0.86 % ±3.64% ±5.03% ±6.96%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer-middle' 0.41 % ±3.35% ±4.62% ±6.36%
buffers/buffer-from.js n=800000 len=2048 source='arraybuffer' -5.09 % ±10.56% ±15.15% ±22.24%
buffers/buffer-from.js n=800000 len=2048 source='buffer' ** 1.53 % ±0.93% ±1.28% ±1.75%
buffers/buffer-from.js n=800000 len=2048 source='object' 0.34 % ±1.59% ±2.19% ±3.01%
buffers/buffer-from.js n=800000 len=2048 source='string-base64' -0.41 % ±0.88% ±1.21% ±1.65%
buffers/buffer-from.js n=800000 len=2048 source='string-utf8' *** 5.89 % ±1.13% ±1.57% ±2.17%
buffers/buffer-from.js n=800000 len=2048 source='string' *** 6.34 % ±1.27% ±1.74% ±2.38%
buffers/buffer-from.js n=800000 len=2048 source='uint16array' 0.48 % ±1.03% ±1.41% ±1.93%
buffers/buffer-from.js n=800000 len=2048 source='uint8array' 0.78 % ±1.56% ±2.16% ±2.98%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='ascii' 0.85 % ±1.38% ±1.89% ±2.58%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='latin1' * 1.83 % ±1.66% ±2.30% ±3.17%
buffers/buffer-write-string-short.js n=1000000 len=1 encoding='utf8' * 1.88 % ±1.60% ±2.21% ±3.04%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='ascii' 0.18 % ±1.45% ±1.99% ±2.74%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='latin1' 7.48 % ±15.46% ±22.20% ±32.63%
buffers/buffer-write-string-short.js n=1000000 len=16 encoding='utf8' 4.34 % ±7.11% ±10.18% ±14.89%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='ascii' 1.44 % ±1.82% ±2.50% ±3.42%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='latin1' 0.81 % ±1.28% ±1.76% ±2.42%
buffers/buffer-write-string-short.js n=1000000 len=32 encoding='utf8' 0.43 % ±2.93% ±4.03% ±5.50%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='ascii' 0.22 % ±1.10% ±1.51% ±2.07%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='latin1' 0.92 % ±1.86% ±2.60% ±3.67%
buffers/buffer-write-string-short.js n=1000000 len=8 encoding='utf8' 0.41 % ±2.33% ±3.20% ±4.36%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='' *** 577.07 % ±6.13% ±8.80% ±12.93%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='ascii' 1.27 % ±1.34% ±1.83% ±2.50%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='hex' -0.36 % ±0.59% ±0.83% ±1.19%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='latin1' 0.90 % ±1.22% ±1.67% ±2.30%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf16le' * -1.33 % ±1.09% ±1.50% ±2.05%
buffers/buffer-write-string.js n=1000000 len=2048 args='' encoding='utf8' *** 573.78 % ±5.59% ±7.94% ±11.44%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='' *** 12.86 % ±1.85% ±2.57% ±3.59%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='ascii' -2.36 % ±4.06% ±5.77% ±8.35%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='hex' -0.33 % ±0.64% ±0.88% ±1.21%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='latin1' 0.67 % ±1.75% ±2.40% ±3.27%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf16le' -0.39 % ±0.97% ±1.33% ±1.81%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset' encoding='utf8' 0.12 % ±10.16% ±14.56% ±21.33%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='' *** 9.47 % ±1.17% ±1.60% ±2.18%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='ascii' ** 1.49 % ±1.01% ±1.38% ±1.88%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='hex' 0.52 % ±1.73% ±2.47% ±3.57%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='latin1' ** 1.91 % ±1.15% ±1.60% ±2.22%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf16le' 0.45 % ±1.07% ±1.47% ±2.03%
buffers/buffer-write-string.js n=1000000 len=2048 args='offset+length' encoding='utf8' *** 8.09 % ±1.04% ±1.43% ±1.96%
Be aware that when doing many comparisons the risk of a false-positive result increases.
In this case, there are 50 comparisons, you can thus expect the following amount of false-positive results:
2.50 false positives, when considering a 5% risk acceptance (*, **, ***),
0.50 false positives, when considering a 1% risk acceptance (**, ***),
0.05 false positives, when considering a 0.1% risk acceptance (***)

mertcanaltin · 2026-02-05T19:16:58Z

@nodejs/performance ❤️

anonrig · 2026-02-05T19:18:39Z

Triggered a benchmark CI run: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1794/

nodejs-github-bot · 2026-02-05T19:31:12Z

CI: https://ci.nodejs.org/job/node-test-pull-request/71211/

ChALkeR

non-blocking, can go into a follow-up: this logic likely can be improved further or even unified with #61496

gurgunday

lgtm

codecov · 2026-02-05T20:12:24Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.74%. Comparing base (102cdfe) to head (a6e8753).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #61696 +/- ##
==========================================
- Coverage 89.76% 89.74% -0.02% 
==========================================
Files 674 674 Lines 204424 204431 +7 Branches 39285 39288 +3 ==========================================
- Hits 183504 183470 -34 - Misses 13220 13264 +44 + Partials 7700 7697 -3

Files with missing lines	Coverage Δ
src/string_bytes.cc	`69.66% <100.00%> (+0.65%)`	⬆️

... and 45 files with indirect coverage changes

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❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

anonrig · 2026-02-06T17:03:00Z

@mertcanaltin Please don't click "merge to main branch" or whatever that button title is, it doesn't work with commit-queue. You have to remove your last commit and keep only the existing commit. Since you also pushed something new, we have to go through the whole process again and rebuild your pull-request.

mertcanaltin · 2026-02-06T17:38:04Z

sorry. I mistakenly synced the branch. It should be solved now.

Renegade334 · 2026-02-07T01:44:40Z

This would probably be superseded by #61712? (Although the StringBytes change would likely be easier to backport.)

mertcanaltin · 2026-02-07T08:22:09Z

Thanks! @Renegade334 I agree with your comment that this optimization solves the issue more effectively at the V8 layer. That said, this PR could still be useful as an easier backport option for older release lines. I'm waiting for other maintainers' comments.

addaleax

I wouldn't mind merging this (with the intention of backporting it) and then later reverting it on main once #61712 is available

nodejs-github-bot · 2026-02-07T13:32:20Z

CI: https://ci.nodejs.org/job/node-test-pull-request/71229/

gurgunday · 2026-02-07T13:58:50Z

I like the backport plan

nodejs-github-bot · 2026-02-07T19:14:26Z

Commit Queue failed

- Loading data for nodejs/node/pull/61696
✔ Done loading data for nodejs/node/pull/61696
----------------------------------- PR info ------------------------------------
Title src: use simdutf for one-byte string UTF-8 write in stringBytes (#61696)
Author Mert Can Altin <mertgold60@gmail.com> (@mertcanaltin)
Branch mertcanaltin:mert/simdutf-write-utf8 -> nodejs:main
Labels buffer, c++, author ready, needs-ci
Commits 1
- src: use simdutf for one-byte string UTF-8 write in stringBytes
Committers 1
- Mert Can Altin <mertgold60@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/61696
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Daniel Lemire <daniel@lemire.me>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/61696
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Daniel Lemire <daniel@lemire.me>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
--------------------------------------------------------------------------------
ℹ This PR was created on Thu, 05 Feb 2026 19:11:13 GMT
✔ Approvals: 8
✔ - Yagiz Nizipli (@anonrig) (TSC): https://github.com/nodejs/node/pull/61696#pullrequestreview-3764386119
✔ - Stephen Belanger (@Qard): https://github.com/nodejs/node/pull/61696#pullrequestreview-3758974723
✔ - Daniel Lemire (@lemire): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759154723
✔ - Vinícius Lourenço Claro Cardoso (@H4ad): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759180179
✔ - Сковорода Никита Андреевич (@ChALkeR): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759185771
✔ - Gürgün Dayıoğlu (@gurgunday): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759188442
✔ - Anna Henningsen (@addaleax): https://github.com/nodejs/node/pull/61696#pullrequestreview-3767062000
✔ - René (@Renegade334): https://github.com/nodejs/node/pull/61696#pullrequestreview-3767064889
✘ Last GitHub CI failed
ℹ Last Benchmark CI on 2026-02-05T19:18:39Z: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1794/
ℹ Last Full PR CI on 2026-02-07T13:32:20Z: https://ci.nodejs.org/job/node-test-pull-request/71229/
- Querying data for job/node-test-pull-request/71229/
✔ Build data downloaded
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https://github.com/nodejs/node/actions/runs/21785408042

nodejs-github-bot · 2026-02-07T19:53:34Z

Commit Queue failed

- Loading data for nodejs/node/pull/61696
✔ Done loading data for nodejs/node/pull/61696
----------------------------------- PR info ------------------------------------
Title src: use simdutf for one-byte string UTF-8 write in stringBytes (#61696)
Author Mert Can Altin <mertgold60@gmail.com> (@mertcanaltin)
Branch mertcanaltin:mert/simdutf-write-utf8 -> nodejs:main
Labels buffer, c++, author ready, needs-ci
Commits 1
- src: use simdutf for one-byte string UTF-8 write in stringBytes
Committers 1
- Mert Can Altin <mertgold60@gmail.com>
PR-URL: https://github.com/nodejs/node/pull/61696
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Daniel Lemire <daniel@lemire.me>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/61696
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Daniel Lemire <daniel@lemire.me>
Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br>
Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com>
Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>
--------------------------------------------------------------------------------
ℹ This PR was created on Thu, 05 Feb 2026 19:11:13 GMT
✔ Approvals: 8
✔ - Yagiz Nizipli (@anonrig) (TSC): https://github.com/nodejs/node/pull/61696#pullrequestreview-3764386119
✔ - Stephen Belanger (@Qard): https://github.com/nodejs/node/pull/61696#pullrequestreview-3758974723
✔ - Daniel Lemire (@lemire): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759154723
✔ - Vinícius Lourenço Claro Cardoso (@H4ad): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759180179
✔ - Сковорода Никита Андреевич (@ChALkeR): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759185771
✔ - Gürgün Dayıoğlu (@gurgunday): https://github.com/nodejs/node/pull/61696#pullrequestreview-3759188442
✔ - Anna Henningsen (@addaleax): https://github.com/nodejs/node/pull/61696#pullrequestreview-3767062000
✔ - René (@Renegade334): https://github.com/nodejs/node/pull/61696#pullrequestreview-3767064889
✘ Last GitHub CI failed
ℹ Last Benchmark CI on 2026-02-07T19:14:26Z: https://ci.nodejs.org/view/Node.js%20benchmark/job/benchmark-node-micro-benchmarks/1794/
ℹ Last Full PR CI on 2026-02-07T19:14:26Z: https://ci.nodejs.org/job/node-test-pull-request/71229/
- Querying data for job/node-test-pull-request/1794/
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✔ Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/21785918980

Renegade334 · 2026-02-07T19:57:34Z

The last set of actions were cursed by the GHA outage.

PR-URL: #61696 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Daniel Lemire <daniel@lemire.me> Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>

Renegade334 · 2026-02-07T20:05:22Z

Landed in 28979fb

PR-URL: #61696 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Daniel Lemire <daniel@lemire.me> Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>

This MR contains the following updates: | Package | Update | Change | |---|---|---| | [node](https://nodejs.org) ([source](https://github.com/nodejs/node)) | patch | `25.6.0` → `25.6.1` | MR created with the help of [el-capitano/tools/renovate-bot](https://gitlab.com/el-capitano/tools/renovate-bot). **Proposed changes to behavior should be submitted there as MRs.** --- ### Release Notes <details> <summary>nodejs/node (node)</summary> ### [`v25.6.1`](https://github.com/nodejs/node/releases/tag/v25.6.1): 2026-02-10, Version 25.6.1 (Current), @aduh95 [Compare Source](nodejs/node@v25.6.0...v25.6.1) ##### Notable Changes - \[[`47df4328d7`](nodejs/node@47df4328d7)] - **build,deps**: replace `cjs-module-lexer` with `merve` (Yagiz Nizipli) [#61456](nodejs/node#61456) ##### Commits - \[[`47df4328d7`](nodejs/node@47df4328d7)] - **build,deps**: replace cjs-module-lexer with merve (Yagiz Nizipli) [#61456](nodejs/node#61456) - \[[`a727054503`](nodejs/node@a727054503)] - **deps**: upgrade npm to 11.9.0 (npm team) [#61685](nodejs/node#61685) - \[[`c78c49ed6b`](nodejs/node@c78c49ed6b)] - **deps**: update amaro to 1.1.7 (Node.js GitHub Bot) [#61730](nodejs/node#61730) - \[[`4790816d9b`](nodejs/node@4790816d9b)] - **deps**: update minimatch to 10.1.2 (Node.js GitHub Bot) [#61732](nodejs/node#61732) - \[[`8c71740e8a`](nodejs/node@8c71740e8a)] - **deps**: update undici to 7.21.0 (Node.js GitHub Bot) [#61683](nodejs/node#61683) - \[[`e559ef6ab1`](nodejs/node@e559ef6ab1)] - **deps**: update googletest to [`56efe39`](nodejs/node@56efe39) (Node.js GitHub Bot) [#61605](nodejs/node#61605) - \[[`300de2bb5a`](nodejs/node@300de2bb5a)] - **deps**: update amaro to 1.1.6 (Node.js GitHub Bot) [#61603](nodejs/node#61603) - \[[`e71e9505ef`](nodejs/node@e71e9505ef)] - **dns**: fix Windows SRV ECONNREFUSED by adjusting c-ares fallback detection (notvivek12) [#61453](nodejs/node#61453) - \[[`439b816bc7`](nodejs/node@439b816bc7)] - **doc**: clarify EventEmitter error handling in threat model (Matteo Collina) [#61701](nodejs/node#61701) - \[[`c1c6641f23`](nodejs/node@c1c6641f23)] - **doc**: mention default option for test runner env (Steven) [#61659](nodejs/node#61659) - \[[`41ec451f98`](nodejs/node@41ec451f98)] - **doc**: fix --inspect security warning section (Tim Perry) [#61675](nodejs/node#61675) - \[[`bb90ef2356`](nodejs/node@bb90ef2356)] - **doc**: document `url.format(urlString)` as deprecated under DEP0169 (René) [#61644](nodejs/node#61644) - \[[`513df82e6f`](nodejs/node@513df82e6f)] - **doc**: update to Visual Studio 2026 manual install (Mike McCready) [#61655](nodejs/node#61655) - \[[`9409d30736`](nodejs/node@9409d30736)] - **doc**: deprecation add more codemod (Augustin Mauroy) [#61642](nodejs/node#61642) - \[[`75a7a67151`](nodejs/node@75a7a67151)] - **doc**: fix grammatical error in README.md (ayj8201) [#61653](nodejs/node#61653) - \[[`821e59e884`](nodejs/node@821e59e884)] - **doc**: correct tools README Boxstarter link (Mike McCready) [#61638](nodejs/node#61638) - \[[`4998f539a0`](nodejs/node@4998f539a0)] - **doc**: update `server.dropMaxConnection` link (YuSheng Chen) [#61584](nodejs/node#61584) - \[[`9383ac4ab7`](nodejs/node@9383ac4ab7)] - **http**: implement slab allocation for HTTP header parsing (Mert Can Altin) [#61375](nodejs/node#61375) - \[[`e90eb1d561`](nodejs/node@e90eb1d561)] - **meta**: persist sccache daemon until end of build workflows (René) [#61639](nodejs/node#61639) - \[[`ade36ac367`](nodejs/node@ade36ac367)] - **meta**: bump github/codeql-action from 4.31.9 to 4.32.0 (dependabot\[bot]) [#61622](nodejs/node#61622) - \[[`26638bd67f`](nodejs/node@26638bd67f)] - **meta**: bump step-security/harden-runner from 2.14.0 to 2.14.1 (dependabot\[bot]) [#61621](nodejs/node#61621) - \[[`eaa9a96cb6`](nodejs/node@eaa9a96cb6)] - **meta**: bump actions/setup-python from 6.1.0 to 6.2.0 (dependabot\[bot]) [#61627](nodejs/node#61627) - \[[`fd98187828`](nodejs/node@fd98187828)] - **meta**: bump cachix/cachix-action (dependabot\[bot]) [#61626](nodejs/node#61626) - \[[`820c1d021c`](nodejs/node@820c1d021c)] - **meta**: bump actions/setup-node from 6.1.0 to 6.2.0 (dependabot\[bot]) [#61625](nodejs/node#61625) - \[[`72a4136bd5`](nodejs/node@72a4136bd5)] - **meta**: bump actions/cache from 5.0.1 to 5.0.3 (dependabot\[bot]) [#61624](nodejs/node#61624) - \[[`e3ef6cb3bc`](nodejs/node@e3ef6cb3bc)] - **meta**: bump peter-evans/create-pull-request from 8.0.0 to 8.1.0 (dependabot\[bot]) [#61623](nodejs/node#61623) - \[[`020a836202`](nodejs/node@020a836202)] - **meta**: bump actions/stale from 10.1.0 to 10.1.1 (dependabot\[bot]) [#61620](nodejs/node#61620) - \[[`0df72f07c8`](nodejs/node@0df72f07c8)] - **meta**: bump actions/checkout from 6.0.1 to 6.0.2 (dependabot\[bot]) [#61619](nodejs/node#61619) - \[[`d147c08b83`](nodejs/node@d147c08b83)] - **module**: do not invoke resolve hooks twice for imported cjs (Joyee Cheung) [#61529](nodejs/node#61529) - \[[`a2843f8556`](nodejs/node@a2843f8556)] - **net**: defer synchronous destroy calls in internalConnect (RajeshKumar11) [#61658](nodejs/node#61658) - \[[`7fb7030781`](nodejs/node@7fb7030781)] - **repl**: fix flaky test-repl-programmatic-history (Matteo Collina) [#61614](nodejs/node#61614) - \[[`d4c9b5cf5b`](nodejs/node@d4c9b5cf5b)] - **sqlite**: avoid extra copy for large text binds (Ali Hassan) [#61580](nodejs/node#61580) - \[[`aa1b3661d9`](nodejs/node@aa1b3661d9)] - **sqlite**: use DictionaryTemplate for run() result (Mert Can Altin) [#61432](nodejs/node#61432) - \[[`9c8ad7e881`](nodejs/node@9c8ad7e881)] - **src**: elide heap allocation in structured clone implementation (Anna Henningsen) [#61703](nodejs/node#61703) - \[[`c4ecfef93d`](nodejs/node@c4ecfef93d)] - **src**: use simdutf for one-byte string UTF-8 write in stringBytes (Mert Can Altin) [#61696](nodejs/node#61696) - \[[`28905b9734`](nodejs/node@28905b9734)] - **src**: consolidate C++ ReadFileSync/WriteFileSync utilities (Joyee Cheung) [#61662](nodejs/node#61662) - \[[`e90cec2f69`](nodejs/node@e90cec2f69)] - **test**: restraint version replacement pattern in snapshots (Chengzhong Wu) [#61748](nodejs/node#61748) - \[[`adce20c0a1`](nodejs/node@adce20c0a1)] - **test**: print stack immediately avoiding GC interleaving (Chengzhong Wu) [#61699](nodejs/node#61699) - \[[`7643bc8999`](nodejs/node@7643bc8999)] - **test**: fix case-insensitive path matching on Windows (Matteo Collina) [#61682](nodejs/node#61682) - \[[`23d1ecf66f`](nodejs/node@23d1ecf66f)] - **test**: fix flaky test-performance-eventloopdelay (Matteo Collina) [#61629](nodejs/node#61629) - \[[`99012a88ed`](nodejs/node@99012a88ed)] - **test**: remove duplicate wpt tests (Filip Skokan) [#61617](nodejs/node#61617) - \[[`a8b32b8ce1`](nodejs/node@a8b32b8ce1)] - **test**: fix race condition in watch mode tests (Matteo Collina) [#61615](nodejs/node#61615) - \[[`086a5a5a25`](nodejs/node@086a5a5a25)] - **test**: update WPT for url to [`e3c46fd`](nodejs/node@e3c46fdf55) (Node.js GitHub Bot) [#61602](nodejs/node#61602) - \[[`f0574fd419`](nodejs/node@f0574fd419)] - **test**: use the skipIfNoWatch() utility function (Luigi Pinca) [#61531](nodejs/node#61531) - \[[`b064ddc221`](nodejs/node@b064ddc221)] - **test**: unify assertSnapshot common patterns (Chengzhong Wu) [#61590](nodejs/node#61590) - \[[`17122e521b`](nodejs/node@17122e521b)] - **test\_runner**: fix test enqueue when test file has syntax error (Edy Silva) [#61573](nodejs/node#61573) - \[[`bad3f02dd9`](nodejs/node@bad3f02dd9)] - **tools**: enforce removal of `lts-watch-*` labels on release proposals (Antoine du Hamel) [#61672](nodejs/node#61672) - \[[`a8f33fd6bd`](nodejs/node@a8f33fd6bd)] - **tools**: use ubuntu-slim runner in meta GitHub Actions (Tierney Cyren) [#61663](nodejs/node#61663) - \[[`c843e447ca`](nodejs/node@c843e447ca)] - **tools**: test `--shared-merve` in `test-shared` workflow (Antoine du Hamel) [#61649](nodejs/node#61649) - \[[`2fedc03f96`](nodejs/node@2fedc03f96)] - **tools**: update OpenSSL to 3.5.5 in `test-shared` (Antoine du Hamel) [#61551](nodejs/node#61551) - \[[`1c1db94670`](nodejs/node@1c1db94670)] - **tools,win**: upgrade install additional tools to Visual Studio 2026 (Mike McCready) [#61562](nodejs/node#61562) </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Enabled. ♻ **Rebasing**: Whenever MR is behind base branch, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this MR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this MR, check this box --- This MR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).

PR-URL: #61696 Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com> Reviewed-By: Stephen Belanger <admin@stephenbelanger.com> Reviewed-By: Daniel Lemire <daniel@lemire.me> Reviewed-By: Vinícius Lourenço Claro Cardoso <contact@viniciusl.com.br> Reviewed-By: Сковорода Никита Андреевич <chalkerx@gmail.com> Reviewed-By: Gürgün Dayıoğlu <hey@gurgun.day> Reviewed-By: Anna Henningsen <anna@addaleax.net> Reviewed-By: René <contact.9a5d6388@renegade334.me.uk>

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mertcanaltin force-pushed the mert/simdutf-write-utf8 branch from 8de635a to c74c73dCompare February 6, 2026 17:30

src: use simdutf for one-byte string UTF-8 write in stringBytes
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2026-02-10, Version 25.6.1 (Current) #61739
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src: use simdutf for two-byte string utf8 conversion in utf8 value #62248
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