1188708 - Report SSE*/AVX/etc availability in about:support

Status: NEW

(Toolkit :: General, defect)

Description

[Seth Fowler [:seth] [:s2h]]

(Apologies, this is probably the wrong component.)

Can we report the availability of SSE*/AVX/etc in about:support? I'm suspicious that we're accidentally running SSE2 code on processors that don't support it in a bug I've been investigating recently, and it took a long time to notice the issue. It would have been helpful to have this information in about:support, as then a pattern would have emerged more quickly.

Comment 1

[Makoto Kato [:m_kato]]

We can have SSE(SSE2/SSSE3/SSE4.1) support data via telemetry - cpu.extensions.  But AVX/AVX2 isn't.

Comment 2

[:Gijs (he/him)]

Ted, do you know if/where we could get the AVX data from JS? I'm also not really sure what "cpu.extensions" is, DXR turns up 0 hits.

Comment 3

[Makoto Kato [:m_kato]]

See xpcom/base/nsSystemInfo.cpp and http://mxr.mozilla.org/mozilla-central/source/toolkit/components/telemetry/TelemetryEnvironment.jsm?mark=1178-1192#1178

Comment 4

[Guilherme Lima]

This information is available in about:telemtry - Environment Data - system, isn't?

Comment 5

[Makoto Kato [:m_kato]]

(In reply to Guilherme Lima from comment #4)
> This information is available in about:telemtry - Environment Data - system,
> isn't?

This is reported by bug 1272359