Bare Bones Backend
The Bare Bones Backend, or B3 for short, is WebKit's optimizing JIT for procedures containing C-like code. It's currently used as the default backend for the FTL JIT inside JavaScriptCore. B3 comprises a C-like SSA IR known as "B3 IR", optimizations on B3 IR, an assembly IR known as "Air", optimizations on Air, an instruction selector that turns B3 IR into Air, and a code generator that assembles
Introducing the B3 JIT Compiler
As of r195562, WebKit’s FTL JIT (Faster Than Light Just In Time compiler) now uses a new backend on OS X. The Bare Bones Backend, or B3 for short, replaces LLVM as the low-level optimizer in the FTL JIT. While LLVM is an excellent optimizer, it isn’t specifically designed for the optimization challenges of dynamic languages like JavaScript. We felt that we could get a bigger speed-up if we combine
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