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Math.sumPrecise rounding coverage
Suggested reviewers: Merge Risk: ⚪ Minimal · up to The WebKit pin and regression coverage are ready for merge; no actionable merge-blocking risk remains. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
Full details: Description checkExplanation The description explains the problem, fix, WebKit preview pin, test coverage, verification results, and post-merge pinning requirement. It does not use the exact template headings, but it provides the required information in detail. Comment |
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I reviewed this PR and didn't find any bugs in the Bun-side changes. Deferring to a human because the PR description states WEBKIT_VERSION must be repointed from the autobuild-preview-pr-458-* tag to a main sha (and coordinated with #39371) before landing — that sequencing decision needs a maintainer.
What was reviewed:
prebuiltUrl/prebuiltDestDirinwebkit.tshandle theautobuild-prefix correctly, so the preview tag resolves and caches without collision.- The new fixture follows the existing
jsc-stresspattern (// @bunheader, registered injsFixtures, throws on mismatch so exit code drives the assertion). - Spot-checked several expected values (
[-2, ULP/2]tie-to-even →-2,[-MAX, -(2**970)]→-Infinity,[-1, 1]→+0viaObject.is) — they match IEEE-754 round-to-nearest-even.
Extended reasoning...
Overview
The PR bumps WEBKIT_VERSION in scripts/build/deps/webkit.ts from sha c6cfe90c… to the preview tag autobuild-preview-pr-458-7051f3b5, adds a 123-line JSC stress fixture exercising Math.sumPrecise rounding of negative sums, and registers it in jsc-stress.test.ts. The actual fix lives in oven-sh/WebKit#458; the Bun-side change is the pin plus the regression test.
Security risks
None. The change is a dependency version pin to a build produced by Bun's own oven-sh/WebKit CI, plus a pure-computation test fixture. No user input handling, auth, crypto, or network paths are touched.
Level of scrutiny
Medium-high. While the Bun-side diff is mechanically simple (a one-line pin change, a fixture list append, and a self-contained test file), a WebKit pin bump swaps the entire JS engine underneath Bun. Per the repo's "Dependencies & vendoring" guidance, dep bumps warrant maintainer review. More importantly, the PR description is explicit that this pin is temporary: oven-sh/WebKit#458 must merge first, then WEBKIT_VERSION must be repointed at the resulting main sha, and landing order must be coordinated with #39371 (which carries the Bun-side changes for the post-upgrade WebKit main). Landing the preview tag as-is would ship a non-main WebKit build.
Other factors
- The build script already special-cases
autobuild-prefixed versions in bothprebuiltUrl(uses the tag verbatim) andprebuiltDestDir(strips the prefix for the cache key), so the preview tag is handled correctly for CI purposes. - The test fixture is thorough: 58 base cases covering exact/inexact negative sums, quarter/half/three-quarter-ulp rounding, ties on even and odd mantissas, power-of-two boundaries, the
MAX_VALUE/-Infinityedge, positive mirrors, and the+0cancellation case — each run through bothXsumSmall(array + generator) andXsumLarge(padded past 1000 elements). Assertions useObject.isso-0/+0andNaNare compared correctly. - The fixture matches the harness convention exactly (throws on failure → nonzero exit →
expect(exitCode).toBe(0)fails with stdout/stderr logged). - No prior reviewer comments to address; the only timeline entry is a CodeRabbit rate-limit notice.
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Confirming the sequencing for whoever lands this: the preview tag is not meant to be merged. Once oven-sh/WebKit#458 merges I will push the repoint of |
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Rebased onto main (3b4cb6e). #39371 moved main's |
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I reviewed this PR and didn't find any issues in the Bun-side changes. Since WEBKIT_VERSION is currently pointed at a preview tag that (per the description) must be repointed to a merged oven-sh/WebKit main sha before landing, and the engine change itself lives in oven-sh/WebKit#458, a maintainer should coordinate the landing sequence rather than this being auto-approved.
What was reviewed:
- The new fixture's expected values (round-to-nearest-even at ±half-ulp, ties on even/odd mantissas, power-of-two boundaries,
-MAX_VALUEoverflow tie,+0on cancellation viaObject.is) — spot-checked against IEEE 754 semantics. - The >1000-element padding and generator variants correctly exercise the
XsumLargeand forced-XsumSmallpaths;cases.slice()avoids mutating during iteration. prebuiltUrl()/prebuiltDestDir()inwebkit.tsalready handle theautobuild-prefix, so the preview pin resolves correctly.
Extended reasoning...
Overview
This PR changes three files: (1) scripts/build/deps/webkit.ts bumps WEBKIT_VERSION from the eeab0404… sha to the preview tag autobuild-preview-pr-458-ffe26339; (2) a new 123-line JSC stress fixture math-sum-precise-negative-rounding.js covering Math.sumPrecise rounding of negative sums; (3) a two-line addition registering that fixture in jsc-stress.test.ts. The actual behavioral fix is in oven-sh/WebKit#458 (the xsum negative-branch rounding table in WTF::Xsum::XsumSmall::compute), not in this repo.
Security risks
None. The change is a dependency pin plus a test fixture. The fixture is plain arithmetic with no I/O, network, or filesystem access; it runs in a spawned subprocess like every other jsc-stress fixture.
Level of scrutiny
High — not because the Bun-side diff is complex (it isn't; the fixture and registration are straightforward and follow the existing jsc-stress conventions exactly), but because:
WEBKIT_VERSIONcontrols which JavaScriptCore engine every Bun build links. Bumping it is effectively a dependency upgrade of the JS engine.- The pin is currently at a preview tag. The PR description and the robobun status comment both explicitly state the preview tag is not meant to be merged and must be repointed to the resulting oven-sh/WebKit main sha once #458 lands there.
- The correctness of the engine change (the xsum rounding-table fix) can only be reviewed in oven-sh/WebKit#458, not here.
Other factors
The fixture itself is well-constructed: it uses Object.is so -0/+0 and NaN are distinguished, covers each rounding outcome for negative sums plus positive mirrors, exercises both accumulator sizes (array vs. >1000-element padded array vs. generator), and the expected values I spot-checked are consistent with IEEE 754 round-to-nearest-even. The registration in jsc-stress.test.ts matches the neighboring entries. webkit.ts already special-cases autobuild--prefixed versions in both prebuiltUrl() and prebuiltDestDir(), so the preview tag is handled by existing machinery. No bugs were found by the bug-hunting system. Given the explicit landing-order dependency on an unmerged upstream PR and that WebKit bumps are maintainer-coordinated, deferring rather than auto-approving.
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Agreed, this stays on the preview tag until oven-sh/WebKit#458 merges; I will repoint |
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Updated 8:35 AM PT - Aug 28th, 2026
❌ @robobun, your commit 4caecc1 has 2 failures in
🧪 To try this PR locally: bunx bun-pr 39455That installs a local version of the PR into your bun-39455 --bun |
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I reviewed this and found no issues with the fixture or its registration. Deferring to a human because WEBKIT_VERSION is still pinned to the autobuild-preview-pr-458-f423272e preview tag, which per this PR's own sequencing notes is not meant to be merged — it needs repointing to the resulting oven-sh/WebKit main sha once #458 lands there.
What was reviewed:
- The fixture's expected values (spot-checked the ulp/tie-to-even cases and the
-MAX_VALUE/2 ** 970overflow tie against IEEE-754 semantics — they check out). - The XsumLarge padding: 500 pairs of
±2**500plus up to 4 case inputs crosses the 1000-element threshold and the pairs cancel exactly. prebuiltUrl/prebuiltDestDirinwebkit.tsalready handleautobuild--prefixed tags, so the preview pin resolves correctly.- Noted the description still references
ffe26339/eeab0404while the diff now showsf423272eover base0f966e81(post-#39614 rebase) — cosmetic, but worth syncing when the final repoint lands.
Extended reasoning...
Overview
This PR does three things: (1) changes WEBKIT_VERSION in scripts/build/deps/webkit.ts from a 40-hex main sha to an autobuild-preview-pr-458-* tag, (2) adds a 123-line JSTests-style fixture exercising Math.sumPrecise rounding of negative sums, and (3) registers that fixture in jsc-stress.test.ts. The actual behavioral fix lives in oven-sh/WebKit#458 (WTF::Xsum::XsumSmall::compute()), not in this repo.
Security risks
None. The change is a dependency version pin plus a pure-JS test fixture that only calls Math.sumPrecise and Object.is. No auth, crypto, permissions, or untrusted-input parsing is touched.
Level of scrutiny
High — not because the diff here is complex (it isn't), but because a WebKit pin bump swaps the entire JS engine binary for every platform/ABI combination. Per the repo's own guidance, dependency bumps and vendored changes warrant maintainer sign-off. More concretely, the PR author has stated three times in the timeline that the preview tag "is not meant to be merged" and that WEBKIT_VERSION must be repointed to the post-merge main sha of oven-sh/WebKit before landing. The current diff still carries the preview tag, so by the author's own criteria this is not yet in a mergeable state.
Other factors
- The fixture itself is well-constructed: it covers exactly-representable negatives, quarter/half/three-quarter-ulp cases, ties on even and odd mantissas with ±MIN_SUBNORMAL tie-breakers, the just-inside-a-power-of-two borrow case, the
-MAX_VALUEneighbourhood, positive mirrors, and the >1000-elementXsumLargepath via cancelling padding plus a generator path forXsumSmall. Each assertion usesObject.isso-0/+0and NaN would be distinguished. I found no vacuous or unreachable assertions. - The
jsc-stress.test.tsregistration follows the existing pattern exactly (appended tojsFixtureswith a one-line comment linking the WebKit PR). - There is a minor inconsistency: the PR description and status comments reference preview tag
ffe26339rebased over main pineeab0404, but the actual diff showsf423272ereplacing base0f966e81— evidently another rebase after #39614 landed that wasn't reflected in the description. This doesn't affect correctness but a human should confirm the final pin lineage when repointing. - No prior
claude[bot]reviews exist on this PR, so this is my first pass.
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Rebased again after #39614 moved main's pin to |
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Rebased a third time: #39829 moved main's pin to |
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I reviewed the Bun-side changes and didn't find any bugs — the fixture is well-constructed and its registration follows the existing jsc-stress pattern. Deferring to a maintainer because this is a WebKit engine bump and, as the description notes, WEBKIT_VERSION is currently on a preview tag that needs repointing to a merged oven-sh/WebKit sha before landing.
What was reviewed
- The fixture's expected values: spot-checked the exactly-representable cases, tie-to-even cases, and the
-MAX_VALUE/-Infinityboundary — all consistent with round-to-nearest-ties-to-even. - The
>1000element padding path and generator path both exercise the intended accumulator variants;cases.slice()correctly avoids mutating during iteration. prebuiltUrl/prebuiltDestDirinwebkit.tsalready handleautobuild--prefixed version strings, so the preview tag resolves correctly.
Extended reasoning...
Overview
This PR bumps WEBKIT_VERSION in scripts/build/deps/webkit.ts from a fork-main sha to a preview build tag (autobuild-preview-pr-458-b185619b) that carries the fix from oven-sh/WebKit#458 for Math.sumPrecise mis-rounding negative sums. It adds a 123-line JSC stress fixture covering 58 rounding cases (each run three ways: array, padded past the 1000-element XsumLarge threshold, and generator) and registers it in jsc-stress.test.ts.
Security risks
None. The change is a version-string edit plus a pure-computation test fixture. No user input handling, auth, crypto, or filesystem/network paths are touched on the Bun side. The engine change itself lives in oven-sh/WebKit#458.
Level of scrutiny
The Bun-side diff is mechanically simple and I found no issues with it: the fixture's expected values match IEEE-754 round-to-nearest semantics for the cases I checked, the cases.slice() before pushing padded variants avoids infinite iteration, and the fixture registration mirrors neighbouring entries. However, a WebKit pin change swaps the entire JS engine — that is inherently high-impact, the actual fix is in a separate repo, and the author has stated the preview tag is not meant to be merged as-is. Landing is explicitly gated on oven-sh/WebKit#458 merging first and this PR being repointed to the resulting sha, which requires maintainer coordination across two repos.
Other factors
The PR description and status comments already track the sequencing constraint clearly, and a prior revision passed all 179 CI jobs. No prior claude[bot] review exists on this PR. Given the cross-repo landing dependency and the engine-level scope, this should have a maintainer's sign-off rather than an automated approval.
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Agreed on the sequencing; nothing changed on that front. For this head the preview release exists, so build 102225 is past the WebKit download and running the suite. The pin moves from the preview tag to a main sha as soon as oven-sh/WebKit#458 is merged. |
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Rebased a fourth time: #35343 moved main's pin to |
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Rebased a fifth time: #40201 moved main's pin to |
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I reviewed this PR and didn't find any bugs in the fixture or its registration. Not approving because the change is explicitly not ready to land as-is: WEBKIT_VERSION still points at the ephemeral autobuild-preview-pr-458-* tag, and the description/status comments say it must be repointed to the resulting oven-sh/WebKit main sha once #458 merges there. A maintainer needs to coordinate that sequencing.
What was reviewed:
- Fixture assertions spot-checked (exact/tie/±ulp cases, MAX_VALUE overflow tie, XsumLarge padding, generator path) — expected values are consistent with round-to-nearest-ties-to-even.
prebuiltUrl/prebuiltDestDirhandle theautobuild-prefix, so the preview tag resolves correctly for CI.- Fixture registration follows the existing
jsFixturespattern injsc-stress.test.ts.
Extended reasoning...
Overview
This PR bumps WEBKIT_VERSION in scripts/build/deps/webkit.ts from main sha c148a12d… to the preview tag autobuild-preview-pr-458-a16c8644, adds a 123-line JSTests/stress-style fixture exercising Math.sumPrecise rounding of negative sums, and registers it in jsc-stress.test.ts. The actual engine fix lives in oven-sh/WebKit#458; the Bun-side diff is a pin bump plus test coverage.
Security risks
None. The change is a version-pin string, a pure-JS numeric test fixture, and a one-line array append. No auth, crypto, parsing of untrusted input, or native code is touched in this repo.
Level of scrutiny
The Bun-side diff is mechanically simple, but it is a dependency bump of the JS engine and, more importantly, is pinned to an ephemeral preview release. The PR author states in both the description and the timeline that "the preview tag is not meant to be merged" — WEBKIT_VERSION must be repointed at the resulting fork-main sha after oven-sh/WebKit#458 lands, otherwise main would depend on a preview release that disappears. That is a landing-order decision a maintainer has to make, not something an automated review should approve past.
Other factors
The fixture itself looks solid: it uses Object.is for exact bit-level comparison, covers exact negatives, sub-ulp/tie/over-half-ulp rounding in both directions, the -MAX_VALUE → -Infinity tie, the >1000-element XsumLarge path via cancelling padding, and the generator (non-array iterable) path. Registration matches sibling entries in jsFixtures. webkit.ts already special-cases autobuild- tags in both the release URL and the cache-dir key, so the preview pin works for CI. No prior claude[bot] review exists on this PR.
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Nothing to change from either review. On the "linked issue #39" pre-merge warning: this PR is not linked to any issue; the checker read the |
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Note GitHub couldn't provide a complete incremental comparison for this pull request, so CodeRabbit is performing a full review instead. This review may take a little longer. |
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Rebased a sixth time: #40276 (the 8c4fd56347 upstream upgrade) moved main's pin to |
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Actionable comments posted: 1
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Inline comments:
In `@test/js/bun/jsc-stress/jsc-stress.test.ts`:
- Around line 124-125: Run the registered math-sum-precise-negative-rounding.js
stress fixture through the jsFixtures loop using the specified test command, and
confirm the jsc-stress.test.ts test passes before pushing.
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scripts/build/deps/webkit.tstest/js/bun/jsc-stress/fixtures/math-sum-precise-negative-rounding.jstest/js/bun/jsc-stress/jsc-stress.test.ts
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CodeRabbit's one comment (run the jsc-stress file before pushing) is answered and resolved in its thread: that run is part of every push here, and its result for each revision is recorded in the description. The "linked issue #39" warning in its pre-merge checks is the same misparse as before (the |
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Rebased a seventh time: #40417 moved main's pin to |
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On the pin review comment: correct, the preview tag is not to be merged, and nothing here is changing that. It stays until oven-sh/WebKit#458 merges, then |
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Rebased an eighth time: #40507 moved main's pin to |
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Main moved its pin to |
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Pushed the tenth rebase: main's pin is |
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Rebased an eleventh time: #40643 moved main's pin to |
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Rebased a twelfth time: #40674 moved main's pin to |
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Rebased a thirteenth and fourteenth time: #40681 (the 6b879687ee upstream upgrade) moved main's pin to |
…tive sums to nearest Every exactly representable negative sum came back one ulp too large in magnitude (Math.sumPrecise([-1]) was -1.0000000000000002 and [-Number.MAX_VALUE] was -Infinity): the rounding step of WTF's xsum port rounded a negative sum away from zero whenever no bit below the guard bits was set. oven-sh/WebKit#458 restores xsum's decision table; this pins its preview build and runs the stress test from that PR as a jsc-stress fixture.
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Rebased a fifteenth time: #40767 moved main's pin to |
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Problem
Math.sumPrecisereturns every exactly representable negative sum one ulp too large in magnitude:Math.sumPrecise([-1])is-1.0000000000000002,[-0.5]is-0.5000000000000001,[1, -2]is-1.0000000000000002,[-Number.MAX_VALUE]is-Infinity. A negative sum just inside a power of two is rounded onto it too ([-2, 2 ** -52]gives-2instead of-1.9999999999999998). Positive sums and inexact negative sums are right. Same on Bun 1.3.14, so not a 1.4 regression; found by a differential fuzz run against an exact reference, where all 468 of 10,000 mismatching arrays fell into this one bucket.WTF::Xsum::XsumSmall::compute()(Source/WTF/wtf/PreciseSum.cpp, the port of xsum thatMath.sumPrecisesums into; arrays longer than 1000 elements useXsumLarge, which is rounded by the same function). Its negative branch rounds away from zero whenever no bit below the two guard bits is set, where the original xsum only does so for guard bits11, or10on an odd mantissa (a tie). An exactly representable sum has no bits set below the mantissa, so it always took that path. Upstream WebKit has the same code.Fix
c6cfe90cprebuilt WTF and comparing it bit for bit with Radford Neal'sxsum.con 3.75 million generated inputs (805,856 with a negative, exactly representable sum; the unmodified file mismatches on 20% of them), plus a 30,000 input sample against exact rational arithmetic.WEBKIT_VERSIONat that PR's preview build,autobuild-preview-pr-458-668c1f16, so CI runs Bun against it. The WebKit branch is the fix commit onceb9f90f, the fork main commit main pins since compile: cheaper bytecode-cache constant decode (WebKit bump) #40767, so the preview is exactly the current pin plus the fix.WEBKIT_VERSIONhas to be repointed at the resulting main sha (the build prints that instruction itself once the preview release disappears); I will push that repoint when the merge happens. If another bump that already contains next always using default port for stylesheet, even when running on another port #458 lands first, this PR reduces to the fixture and its registration.test/js/bun/jsc-stress/fixtures/math-sum-precise-negative-rounding.js, theJSTests/stressfile from the WebKit PR with the usual// @bunfirst line, registered injsc-stress.test.ts. It checks 58 cases: the sums from the report, each rounding outcome for a negative sum (quarter ulp, three quarters, ties on even and odd mantissas, the same ties with one subnormal added or removed so the scan of the lower accumulator chunks decides, magnitudes just inside a power of two, the-MAX_VALUEneighbourhood including the-Infinitytie) and the positive mirror images. Each case runs as an array, as the same array padded past the 1000 elementXsumLargethreshold with cancelling pairs, and as a generator (alwaysXsumSmall), plus three plain 1001 element arrays. All 119 expected values were checked against exact rational arithmetic independently of any engine.bun bd test test/js/bun/jsc-stress/jsc-stress.test.ts -t math-sum-precisefails at the fixture's first case withMath.sumPrecise([-1]) returned -1.0000000000000002, expected -1on every pin main has had since this PR was opened (1817c3c3was the last one run locally, withprocess.versions.webkitchecked;PreciseSum.cppis byte for byte the same in the current pinceb9f90f) and on the releasedbun(92 of the fixture's 238 assertions fail on those engines). Upstream WebKit as of 6b879687ee still has the bug.process.versions.webkitreportspreview-pr-458-668c1f16), the fixture passes and the wholejsc-stress.test.tspasses its 117 fixtures (debug + ASAN build; the new fixture takes about 1 s there and 30 ms on the releasejscshell). Earlier revisions with a published preview passed every CI job six times (builds 100401, 102225, 104071, 104891, 106394 and 107650); the other builds had only red lanes from tests that fail the same way on main (see the details block).Background
scripts/build/deps/webkit.tspins which build. An engine fix lands as a WebKit PR plus a pin bump here, and theautobuild-preview-pr-*releases let the bump PR run Bun's suite against the WebKit PR before it merges.test/js/bun/jsc-stress/runs files taken verbatim from WebKit'sJSTests/stressunderbun, so the engine test is shared with the WebKit PR as is.Earlier revisions of this PR
Each time main's pin moved while oven-sh/WebKit#458 was open, the fix commit was re-applied on the new fork main and this PR was rebased and repinned to the new preview; the only conflict each time was the
WEBKIT_VERSIONline. Revisions:autobuild-preview-pr-458-7051f3b5(fix on the pre-47f7250137c6 main, before #39371 landed),ffe26339(fix oneeab0404; CI build 100401 passed all 179 jobs),f423272e(fix on0f966e81; its preview release was never produced because the fork's x64 runners were failing every PR's preview build at the time),b185619b(fix onb7f217b4; CI build 102225 passed all 179 jobs),0609b9b5(fix onaea1f010; CI build 104071 passed all 181 jobs),a16c8644(fix onc148a12d; CI build 104891 passed all 181 jobs),9767dac3(fix oncb61607f; CI build 105561 passed 179 of 181, the two red lanes being a gitlab.com 502 in bun-install.test.ts and the require-cache.test.ts RSS threshold that also fails on main),b7be8936(fix on1cb96a7b; CI build 105946 passed 180 of 181, the red lane being require-cache.test.ts again, pre-existing on main),5dba0487(fix on76882271; CI build 106136 passed 180 of 181, the red lane again require-cache.test.ts),754b429c(fix on2da33d53; CI build 106394 passed all 181 jobs),6ab847b8(fix on72597399; its preview release was never produced: the fork's Windows arm64 job failed in its scoop based runner setup on 19 attempts, fixed on fork main by oven-sh/WebKit#523),58784255(fix ond9feedfc; CI build 106939 passed 168 of 181, every red lane a test that fails the same way on main's own builds),c7b3aabb(fix on0bb01ed5; CI build 107133 passed 179 of 181, the two red lanes require-cache.test.ts and url.test.ts, both pre-existing on main),98b0c6c0(fix onf5deafe0; CI build 107212 passed 180 of 181, the red lane url.test.ts, pre-existing on main),31d19b15(fix on1817c3c3, the 6b879687ee upstream upgrade; CI build 107614 had no non-flaky failures; superseded within the hour by the next pin bump),443e5b3e(fix onc4ddc0cf; CI build 107650 passed all 181 jobs), now668c1f16(fix onceb9f90f, after #40767).Repro
[decide:webkit] gate passed · iteration 14 · 3 files touched
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gate history · 13 passed · 1 rejected · iteration 14
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