140805 2015-01-22 17:47:36 -0800 Sink function allocations, and then the activation allocation, to a point where we know that let-bound variables are initialized - and then allow those functions' code to be optimized without TDZ checks 2015-01-22 17:47:36 -0800 1 1 1 Unclassified WebKit JavaScriptCore 528+ (Nightly build) All All NEW P2 Normal --- 1 fpizlo webkit-unassigned oldest_to_newest 1063551 0 fpizlo 2015-01-22 17:47:36 -0800 The optimizing compiler already has the ability to sink allocations to the point where they escape. Doing this for activation and function allocations would enable us to prove cases where the function cannot see the TDZ of some let-bound variables.