606494 - Simple loops no longer trace with JIT profiling enabled

Status: RESOLVED WONTFIX

(Core :: JavaScript Engine, defect)

Description

[Jan de Mooij [:jandem]]

While closing bug 469351 I noticed that disabling JM or loop profiling makes the simple loop benchmark twice as fast. See URL for the tests. The loops look like this:

for(var a=0;a<mult;a++) {
    for (var i=0; i<hColl.length; i++) {  }
}

Comment 1

[Luke Wagner [:luke]]

If you add a single arithmetic op to the inner loop, does it still choose not to use the tjit?

Comment 2

[Ryan VanderMeulen [:RyanVM]]

WONTFIX now that profiling is dead.