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SUZUKI Sosuke 9484218ba4 perf(buffer): move Buffer.slice/subarray to native C++ with int32 fast path (#26819) 
## Summary

Move `Buffer.slice()` / `Buffer.subarray()` from a JS builtin to a
native C++ implementation, eliminating the `adjustOffset` closure
allocation and JS→C++ constructor overhead on every call. Additionally,
add an int32 fast path that skips `toNumber()` (which can invoke
`valueOf`/`Symbol.toPrimitive`) when arguments are already int32—the
common case for calls like `buf.slice(0, 10)`.

## Changes

- **`src/bun.js/bindings/JSBuffer.cpp`**: Add
`jsBufferPrototypeFunction_sliceBody` with `adjustSliceOffsetInt32` /
`adjustSliceOffsetDouble` helpers. Update prototype hash table entries
from `BuiltinGeneratorType` to `NativeFunctionType` for both `slice` and
`subarray`.
- **`src/js/builtins/JSBufferPrototype.ts`**: Remove the JS `slice`
function (was lines 667–687).
- **`bench/snippets/buffer-slice.mjs`**: Add mitata benchmark.

## Benchmark (Apple M4 Max)

| Benchmark | Before (v1.3.8) | After | Speedup |
|---|---|---|---|
| `Buffer(64).slice()` | 27.19 ns | **14.56 ns** | **1.87x** |
| `Buffer(1024).slice()` | 27.84 ns | **14.62 ns** | **1.90x** |
| `Buffer(1M).slice()` | 29.20 ns | **14.89 ns** | **1.96x** |
| `Buffer(64).slice(10)` | 30.26 ns | **16.01 ns** | **1.89x** |
| `Buffer(1024).slice(10, 100)` | 30.92 ns | **18.32 ns** | **1.69x** |
| `Buffer(1024).slice(-100, -10)` | 28.82 ns | **17.37 ns** | **1.66x**
|
| `Buffer(1024).subarray(10, 100)` | 28.67 ns | **16.32 ns** | **1.76x**
|

**~1.7–1.9x faster** across all cases. All 449 buffer tests pass.

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-09 01:46:33 -08:00
..
_fixture.txt
cleanup benchmarks folder (#587)
2022-07-12 01:40:12 -07:00
abort-signal.mjs
perf: skip Event creation in AbortSignal.abort() when no listeners (#26686)
2026-02-02 14:01:25 -08:00
archive.mjs
feat(archive): add TypeScript types, docs, and files() benchmark (#25922)
2026-01-09 19:00:19 -08:00
array-arguments-slice.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
array-map.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
array-of.js
Add simple benchmark for Array.of (#25711)
2025-12-27 00:05:57 -08:00
array-shift.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
array-sort.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
arraybuffersink.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
assert.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
async-overhead.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
atob.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
blob.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
buffer-base64.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
buffer-concat.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
buffer-create.mjs
js: fix Buffer constructor and Buffer.from (#16731)
2025-02-07 15:13:21 -08:00
buffer-fill.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
buffer-from-array.mjs
perf(buffer): optimize Buffer.from(array) by using setFromArrayLike directly (#26135)
2026-01-15 12:10:47 -08:00
buffer-includes.js
node: fix buffer includes+indexof (#16642)
2025-02-18 13:12:03 -08:00
buffer-read.js
Add a zig fmt action (#2277)
2023-03-02 19:02:10 -08:00
buffer-slice.mjs
perf(buffer): move Buffer.slice/subarray to native C++ with int32 fast path (#26819)
2026-02-09 01:46:33 -08:00
buffer-to-string.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
buffer.js
node:buffer: fix read (#17299)
2025-02-12 23:37:36 -08:00
byteLength.mjs
Avoid resolving substrings in bun:sqlite and Buffer.byteLength (#16092)
2024-12-31 19:48:33 -08:00
callbacks-overhead.mjs
Add a zig fmt action (#2277)
2023-03-02 19:02:10 -08:00
color.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
compression-streams.mjs
runtime: implement CompressionStream/DecompressionStream (#24757)
2025-11-20 17:14:37 -08:00
concat.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
console-log.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
cp-r.mjs
get name if not provided in FormData.append (#4434)
2023-08-31 17:33:08 -07:00
cp.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
crypto-2190.mjs
Avoid emitting DCE annotations at runtime (#22300)
2025-09-01 02:56:59 -07:00
crypto-hasher.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
crypto-randomUUID.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
crypto-stream.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
crypto.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
decode.js
Add routes to Bun.serve() (#17357)
2025-02-16 00:42:05 -08:00
deep-equals.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
define-properties.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
dns-prefetch.mjs
bun.sh -> bun.com (#20909)
2025-07-10 00:10:43 -07:00
dns.node.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
dns.ts
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
encode-into.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
error-capturestack.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
escapeHTML.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
exists.js
cleanup benchmarks folder (#587)
2022-07-12 01:40:12 -07:00
express-hello.mjs
node:http improvements (#17093)
2025-03-10 20:19:29 -07:00
fastify.mjs
node:http improvements (#17093)
2025-03-10 20:19:29 -07:00
ffi-overhead.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
form-data.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
hash.mjs
Added rapidhash algorithm (#20163)
2025-06-03 03:34:35 -07:00
headers.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
http-hello.deno.js
Add snippet
2022-12-06 14:18:25 -08:00
http-hello.js
Add snippet
2022-12-06 14:18:25 -08:00
http-hello.node.mjs
Fix a couple bugs with node:http (#6924)
2023-11-06 03:51:49 -08:00
index-of.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
ipc-json-child.mjs
perf(ipc): fix O(n²) JSON scanning for large chunked messages (#25743)
2025-12-29 20:02:18 -08:00
ipc-json.mjs
perf(ipc): fix O(n²) JSON scanning for large chunked messages (#25743)
2025-12-29 20:02:18 -08:00
json-parse-stringify.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
json-stringify.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
jsx-entity-decoding.jsx
cleanup benchmarks folder (#587)
2022-07-12 01:40:12 -07:00
markdown-react.mjs
some benchmarks
2026-01-29 12:38:05 -08:00
markdown.mjs
perf(markdown): cache tag strings in React renderer (#26668)
2026-02-02 17:08:39 -08:00
module-exports-putter.cjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
native-overhead.mjs
Expose some no-ops (#16125)
2025-01-03 13:57:46 -08:00
new-incomingmessage.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
node-vm.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
node-zlib-brotli.mjs
Update node-zlib-brotli.mjs
2025-08-01 14:35:04 -07:00
noop.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
object-entries.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
object-hasown.mjs
[publish images] (+ add Object.hasOwn benchmark)
2025-12-24 19:55:44 -08:00
object-values.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
path-relative.mjs
hmr fixes (#17239)
2025-02-12 23:14:02 -08:00
path-resolve.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
pbkdf2.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
peek-promise.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
performance-now-overhead.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
private.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
process-cwd.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
process-info.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
process.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
promise-race.mjs
Add Promise.race microbenchmark
2025-12-23 22:53:24 -08:00
react-dom-render.bun.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
read-file-chunk.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
read-file.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
readdir.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
readfile-not-found.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
realpath.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
redis-simple.mjs
Clean up some docs
2025-04-08 03:57:35 -07:00
render.js
run prettier and add back format action (#13722)
2024-09-03 21:32:52 -07:00
request-method-getter.mjs
Make request.method getter not allocate memory (#18961)
2025-04-11 20:59:38 -07:00
request-response-clone.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
require-builtins.mjs
js: update node:_http_agent (#24275)
2025-11-04 11:56:33 -08:00
response-arrayBuffer.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
response-json.mjs
perf(Response.json): use JSC's FastStringifier by passing undefined for space (#25717)
2025-12-27 15:01:28 -08:00
resposne-constructor.mjs
Fix memory leak in response.clone(), further reduce memory usage of Request & Response (#3902)
2023-07-30 23:51:43 -07:00
return-await.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
rewriter.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
rmdir.mjs
run prettier and add back format action (#13722)
2024-09-03 21:32:52 -07:00
runner-entrypoint.js
run prettier and add back format action (#13722)
2024-09-03 21:32:52 -07:00
semver.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
serialize.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
set-timeout.mjs
run prettier and add back format action (#13722)
2024-09-03 21:32:52 -07:00
sha512.deno.mjs
Add a bench snippet for sha512
2022-08-21 00:51:27 -07:00
sha512.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
sha512.node.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
shell-spawn.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
source-map.js
Implement "node:module"'s findSourceMap and SourceMap class (#20863)
2025-07-07 23:08:12 -07:00
spawn-hugemem.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
spawn-hugemem.node.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
spawn.deno.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
spawn.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
spawn.node.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
spread-set.mjs
Add benchmark for [...set] (#26452)
2026-01-26 00:25:51 -08:00
stat.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
stderr.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
string-decoder.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
string-includes.mjs
Add microbench for String#includes (#25699)
2025-12-26 21:49:00 -08:00
string-width.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
strip-ansi.mjs
Introduce Bun.stripANSI (#21801)
2025-08-14 22:42:05 -07:00
structuredClone.mjs
perf(structuredClone): add fast path for root-level dense arrays (#26814)
2026-02-08 21:36:59 -08:00
tcp-echo.bun.ts
run prettier and add back format action (#13722)
2024-09-03 21:32:52 -07:00
tcp-echo.node.mjs
split server/client for tcp echo benchmark to better measure net.Socket perf
2023-01-04 18:55:16 -08:00
text-decoder-stream.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
text-decoder.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
text-encoder-stream.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
text-encoder.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
transpiler-2.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
transpiler.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
url.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
urlpattern.js
feat(url): implement URLPattern API (#25168)
2025-11-28 00:04:30 -08:00
urlsearchparams.mjs
ci: repair lint setup and run it in CI (#15720)
2025-01-08 07:12:18 +00:00
util-deprecate.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
webcrypto.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
wrap-ansi.js
Add Bun.wrapAnsi() for text wrapping with ANSI escape code preservation (#26061)
2026-01-16 16:12:23 -08:00
write-file-huge.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
write-file.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
write.bun.js
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
write.node.mjs
Bench updates (#15029)
2024-11-08 23:15:24 -08:00
zlib.mjs
Add zlib microbenchmark
2024-12-24 04:20:24 -08:00