1316557 - Math.pow sometimes returns incorrect results

Status: RESOLVED FIXED

(Core :: JavaScript Engine, defect, P3)

Description

[Hannes Verschore [:h4writer]]

Math.pow(-999, -999) should return -0, but under some compiler flags we are returning 0:

https://treeherder.mozilla.org/#/jobs?repo=try&revision=24c5ecf54fb2&selectedJob=30562285

All failures on bug1314438.js are due to this. This is not related to the jits.

Comment 1

[no.2]

I'm having an issue with Math.pow too.
Math.pow(10, 23) and 10 ** 23 returns 1.0000000000000001e+23
On Chrome it's 1e+23, so I'm using Number("1e" + 23) to get consistent results.

Comment 2

[Steve Fink [:sfink] [:s:]]

(In reply to no.2 from comment #1)

I'm having an issue with Math.pow too.
Math.pow(10, 23) and 10 ** 23 returns 1.0000000000000001e+23
On Chrome it's 1e+23, so I'm using Number("1e" + 23) to get consistent results.

That is a different issue that should have its own bug. Filed bug 1798789.

Comment 3

[Matthew Gaudet (he/him) [:mgaudet]]

Attachment: Bug 1316557 - Test Math.pow(-999,-999) to prevent regression r?nbp

Comment 4

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/1fc9ad61a3d1
Test Math.pow(-999,-999) to prevent regression r=nbp

Comment 5

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/1fc9ad61a3d1