1145644 - Assertion failure: phi->hasUses() (Missed an unused phi), at /mozilla/builds/nightly/mozilla/js/src/jit/ValueNumbering.cpp:685

Status: NEW

(Core :: JavaScript Engine: JIT, defect, P5)

Description

[Carsten Book [:Tomcat]]

Attachment: mac stack

Found via Bughunter and reproduce on a Mac 10.9 Trunk Debug Build based on m-c tip

Steps to reproduce:
Load http://s3.crate.im/emzx/mzxrun.html
Assertion failure: Assertion failure: phi->hasUses() (Missed an unused phi), at /mozilla/builds/nightly/mozilla/js/src/jit/ValueNumbering.cpp:685

Comment 1

[Benjamin Bouvier [:bbouvier] (inactive)]

For what it's worth, this is an emscripten app, that loads a lot of different assets and resources at run time using xhr. Test case fails quickly in the shell. I've tried to make it behave like the browser (by locally preloading assets and then loading them as files rather than via xhr) but then the code complains there's no window/document and other DOM bindings, so it might be hard to reproduce in the shell only...

Comment 2

[Benjamin Bouvier [:bbouvier] (inactive)]

To be clear with respect to my comment: when i say "it fails quickly", that is "it fails to reproduce", not "the assertion triggers", unfortunately.

Comment 3

[Dan Gohman [:sunfish]]

Fortunately, this assert doesn't indicate a correctness problem; it's just a missed optimization opportunity.

Comment 4

[Dan Gohman [:sunfish]]

It's possible that this is the same bug as bug 1133149.