1245025 - Nursery allocate short life span RegExp object.

Status: NEW

Description

[Tooru Fujisawa [:arai]]

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 :)