JIT Compiler Structure
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# Introduction
RyuJIT is the code name for the Just-In-Time Compiler (aka "JIT") for the .NET runtime. It was
evolved from the JIT used for x86 (jit32) on .NET Framework, and ported to support all other architecture and
platform targets supported by .NET Core.
The primary design considerations for RyuJIT are to:
* Maintain a high compatibility bar with previous JITs, especially those for x86 (jit32) and x64 (jit64).
* Support and enable good runtime performance through code optimizations, register allocation, and code generation.
* Ensure good throughput via largely linear-order optimizations and transformations, along with limitations on tracked variables for analyses (such as dataflow) that are inherently super-linear.
* Ensure that the JIT architecture is designed to support a range of targets and scenarios.
The first objective was the primary motivation for evolving the existing code base, rather than starting from scratch
or departing more drastically from the existing IR and architecture.
# Execution Environment and External Interface
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