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# Bugs

> Bugs in the built-in `Math` namespace.

-   [Numeric instability of transcendental functions][@bug:v8:436]
-   [Sine and cosine in V8][@bug:v8:3006]
-   [Trigonometric functions in V8][@bug:chromium:320097]
-   [V8 not IEEE 754-2008 compliant][@bug:v8:3089]
-   [Mozilla discussion on sine and cosine in V8][@bug:mozilla:967709]
-   [V8 replaced a lookup table by computing `Math.tan` as `Math.sin/Math.cos`][@bug:chromium:78263005]
-   [Browser math accuracy issues][@bug:kangax:compat-table:392]
-   [Mozilla attempt to address precision in new Math functions][@bug:mozilla:933257]
-   [Mozilla's previous lack of tolerance tests for Math functions][@bug:mozilla:892671]
-   [Mozilla `Math.expm1` accuracy][@bug:mozilla:897634]
-   [Mozilla thread on implementing ES6 math functions][@bug:mozilla:717379]
-   [V8 `Math.atanh` issues][@bug:v8:3511]
-   [V8 `Math.acosh` issues][@bug:v8:3509]
-   [V8 `Math.asinh` issues][@bug:v8:3496]
-   [V8 numeric issues in hyperbolic functions][@bug:v8:3266]
-   [ES6 accuracy of special functions][@bug:esdiscuss:038525]
-   [Accuracy of `Math.exp` in V8][@bug:v8:3468]
-   [TC39 meeting discussing Math accuracy issues][@bug:esdiscuss:2014-07-31]
-   [Spreadsheet showing trigonometric results across browsers][@bug:esdiscuss:038525:spreadsheet]
-   [Accuracy of `Math.pow` in V8][@bug:v8:3599]
-   [Accumulation of errors in Mozilla `Math.pow`][@bug:mozilla:618251]
-   [Accuracy of hyperbolic trigonometric functions in V8][@bug:paulmiller:es6-shim:334]
-   [ES6 shim accuracy issues][@bug:paulmillr:es6-shim:314]
-   [TC39 testing of Math built-ins][@bug:tc39:test262:269]
-   [V8 `Math.random` PRNG quality][@bug:v8:4566]
-   [V8 trig function precision issues][@bug:v8:1975]
-   [WebKit `Math.random` repeat values in separate workers][@bug:webkit:36673]
-   [Predictable `Math.random` in WebKit][@bug:webkit:26972]
-   [Predictable `Math.random` in Chrome][@bug:chromium:246054]
-   [Desire for fastmath implementations][@bug:mozilla:681357]
-   [Mozilla `Math.round` issues][@bug:mozilla:686708]
-   [Mozilla `Math.pow` issue][@bug:mozilla:703611]
-   [Mozilla `Math.pow` issue][@bug:mozilla:1316557]
-   [V8 deoptimizes if `Math.floor` provided `-0`][@bug:v8:2890]
-   [V8 deoptimizes if `Math.ceil` provided `0`][@bug:v8:4059]
-   [V8 `Math.round` accuracy][@bug:v8:958]
-   [Observability of distinguishable NaNs][@bug:esdiscuss:2013-03-20] (see also [get-nans][get-nans] and ECMA262 issue [635][ecma262-635])
-   [NaN converted to -NaN][@bug:v8:1101]
-   [After 10 years, Mozilla updates `Math.random`][@bug:mozilla:322529]
-   [WebKit bug to use a better PRNG][@bug:webkit:151641]
-   [WebKit 32-bit Math bug][@bug:webkit:40367]
-   [Mozilla optimizations break commutativity][@bug:mozilla:969203]
-   [Mozilla debate on speed versus precision][@bug:mozilla:967709]
-   [Mozilla division bug to due C library delegation][@bug:mozilla:948321]
-   [Fixit to unify Math implementations in V8][@bug:v8:5086]
-   [Fixit to unify `Math.pow` implementation in V8][@bug:v8:5157]

## Notes

-   To search for V8 Math bugs, see [V8 issue tracker][v8-issue-tracker].
-   To search for WebKit Math bugs, see [WebKit issue tracker][webkit-issue-tracker].
-   To search for Mozilla Math bugs, see [Bugzilla][mozilla-issue-tracker].

<!-- <links> -->

[@bug:v8:436]: https://bugs.chromium.org/p/v8/issues/detail?id=436

[@bug:v8:3006]: https://bugs.chromium.org/p/v8/issues/detail?id=3006

[@bug:chromium:320097]: https://bugs.chromium.org/p/chromium/issues/detail?id=320097

[@bug:v8:3089]: https://bugs.chromium.org/p/v8/issues/detail?id=3089

[@bug:mozilla:967709]: https://bugzilla.mozilla.org/show_bug.cgi?id=967709

[@bug:chromium:78263005]: https://github.com/v8/v8/commit/33b5db090258c2a2dc825659c3ad109bd02110c1

[@bug:kangax:compat-table:392]: https://github.com/kangax/compat-table/issues/392

[@bug:mozilla:933257]: https://bugzilla.mozilla.org/show_bug.cgi?id=933257

[@bug:mozilla:892671]: https://bugzilla.mozilla.org/show_bug.cgi?id=892671

[@bug:mozilla:897634]: https://bugzilla.mozilla.org/show_bug.cgi?id=897634

[@bug:mozilla:717379]: https://bugzilla.mozilla.org/show_bug.cgi?id=717379#c5

[@bug:v8:3511]: https://bugs.chromium.org/p/v8/issues/detail?id=3511

[@bug:v8:3509]: https://bugs.chromium.org/p/v8/issues/detail?id=3509

[@bug:v8:3496]: https://bugs.chromium.org/p/v8/issues/detail?id=3496

[@bug:v8:3266]: https://bugs.chromium.org/p/v8/issues/detail?id=3266

[@bug:esdiscuss:038525]: https://esdiscuss.org/topic/es6-accuracy-of-special-functions

[@bug:v8:3468]: https://bugs.chromium.org/p/v8/issues/detail?id=3468

[@bug:esdiscuss:2014-07-31]: https://esdiscuss.org/notes/2014-07-31

[@bug:esdiscuss:038525:spreadsheet]: https://docs.google.com/spreadsheets/d/1t2jrptAvaQetDIYPD8GKc90Dni2dT3FuHgKKFF-eJHw/edit#gid=0

[@bug:v8:3599]: https://bugs.chromium.org/p/v8/issues/detail?id=3599

[@bug:mozilla:618251]: https://bugzilla.mozilla.org/show_bug.cgi?id=618251

[@bug:paulmiller:es6-shim:334]: https://github.com/paulmillr/es6-shim/issues/334

[@bug:paulmillr:es6-shim:314]: https://github.com/paulmillr/es6-shim/issues/314

[@bug:tc39:test262:269]: https://github.com/tc39/test262/pull/269

[@bug:v8:4566]: https://bugs.chromium.org/p/v8/issues/detail?id=4566

[@bug:v8:1975]: https://bugs.chromium.org/p/v8/issues/detail?id=1975

[@bug:webkit:36673]: https://bugs.webkit.org/show_bug.cgi?id=36673

[@bug:webkit:26972]: https://bugs.webkit.org/show_bug.cgi?id=26972

[@bug:chromium:246054]: https://bugs.chromium.org/p/chromium/issues/detail?id=246054

[@bug:mozilla:681357]: https://bugzilla.mozilla.org/show_bug.cgi?id=681357

[@bug:mozilla:686708]: https://bugzilla.mozilla.org/show_bug.cgi?id=686708

[@bug:mozilla:703611]: https://bugzilla.mozilla.org/show_bug.cgi?id=703611

[@bug:mozilla:1316557]: https://bugzilla.mozilla.org/show_bug.cgi?id=1316557

[@bug:v8:2890]: https://bugs.chromium.org/p/v8/issues/detail?id=2890

[@bug:v8:4059]: https://bugs.chromium.org/p/v8/issues/detail?id=4059

[@bug:v8:958]: https://bugs.chromium.org/p/v8/issues/detail?id=958

[@bug:esdiscuss:2013-03-20]: https://esdiscuss.org/topic/observability-of-nan-distinctions-is-this-a-concern

[@bug:v8:1101]: https://bugs.chromium.org/p/v8/issues/detail?id=1101

[get-nans]: https://github.com/ljharb/get-nans

[ecma262-635]: https://github.com/tc39/ecma262/issues/635

[@bug:mozilla:322529]: https://bugzilla.mozilla.org/show_bug.cgi?id=322529

[@bug:webkit:151641]: https://bugs.webkit.org/show_bug.cgi?id=151641

[@bug:webkit:40367]: https://bugs.webkit.org/show_bug.cgi?id=40367

[@bug:mozilla:969203]: https://bugzilla.mozilla.org/show_bug.cgi?id=969203#c8

[@bug:mozilla:948321]: https://bugzilla.mozilla.org/show_bug.cgi?id=948321

[@bug:v8:5086]: https://bugs.chromium.org/p/v8/issues/detail?id=5086

[@bug:v8:5157]: https://bugs.chromium.org/p/v8/issues/detail?id=5157

[v8-issue-tracker]: https://bugs.chromium.org/p/v8/issues/list?can=1&q=math&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary%20HW%20OS%20Component%20Stars&num=100&start=100

[webkit-issue-tracker]: https://bugs.webkit.org/buglist.cgi?quicksearch=math

[mozilla-issue-tracker]: https://bugzilla.mozilla.org/buglist.cgi?quicksearch=math

<!-- </links> -->