211796 2020-05-12 12:58:49 -0700 Constant-fold common case of OpIsConstructor by speculating m_structure 2020-05-12 14:11:46 -0700 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build All All NEW https://bugs.webkit.org/show_bug.cgi?id=144093 P2 Enhancement --- 1 ashvayka webkit-unassigned keith_miller oldest_to_newest 1651874 0 ashvayka 2020-05-12 12:58:49 -0700 For many function “types” we could know if it’s constructible from the structure cell. For example, JSStrictFunction is always constructible, while JSArrowFunction and JSGeneratorFunction are not. Probably we would just store a TriState on the structure and if every structure flowing into the IsConstructor is either TriState::True or TriState::False we can fold to a constant. It’s possible we could store this info on the method table too.