NativeJIT: A C++ expression –> x64 JIT

10 months ago

NativeJIT is an open-source, cross-platform library for high-performance just-in-time (JIT) compilation of expressions involving C data structures.
Developed by the Bing team, it is used in the Bing search engine for scoring documents based on user queries.
NativeJIT is lightweight, fast, and has no dependencies beyond the standard C++ runtime, running on Linux, OSX, and Windows.
It optimizes generated code with a focus on register allocation, crucial for throughput and latency at scale.
Designed for scenarios where expressions are unknown until runtime, evaluated multiple times to amortize compilation costs, and require low compilation latency.
Includes support for arithmetic, logical operations, pointer and array operations, conditionals, structure field access, and calling C functions.
Building NativeJIT requires CMake (2.8.11+) and a modern C++ compiler (gcc 5+, clang 3.4+, or VC 2015+).
Provides example scripts for building on *nix platforms, OS X (using Makefiles or Xcode), and Windows (Visual Studio 2015).
Example code demonstrates compiling an expression to calculate the area of a circle, showcasing generated assembly code.

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