Open Bug 1245025 Opened 5 years ago Updated 5 years ago

Nursery allocate short life span RegExp object.

Categories

(Core :: JavaScript Engine, defect)

Product:
Core
Component:
JavaScript Engine
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Tracking Flags:
Tracking Status
firefox47 --- affected

People

(Reporter: arai, Unassigned)

References

Details

Derived from bug 887016.

Currently RegExp object can only be allocated with NewObjectKind==TenuredObject.
Allocating short life span RegExp object in Nursery will improve performance.

in bug 887016's patch, it improves 10% when calling String.prototype.match/search with pattern string with meta char (like str.match("a+")), that allocates temporary RegExp object.  This case seems to be rare, as it doesn't appear in octane/regexp, so this won't block bug 887016 for now.

of course there will be more applicable cases :)
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