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notes/Copy-and-Patch Compilation.md
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Copy and patch is a novel compilation technique introduced in the above paper that functions (on a broad level) by stitching together code from a large library of binary implementation variants. Copy and patch is a novel compilation technique introduced in the above paper that functions (on a broad level) by stitching together code from a large library of binary implementation variants.
They provide two example use cases, a compiler for a They provide two example use cases, a compiler for a C-like language, and a WebAssembly compiler, and show promising results for both startup time and execution performance.
# Terminology # Terminology
| Phrase | Definition | | Phrase | Definition |
| ------- | -------------------------------------------------------------------------------------------- | | ------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Stencil | A binary implementation that has holes where missing values must be inserted during codegen. | | Stencil | A binary implementation that has holes where missing values must be inserted during codegen. |
| Full Compiler | A compiler that compiles from a high level language to machine code |
| Bytecode Assembler | An assembler that converts low level bytecode to machine code. |
| Baseline compiler | In tiered compilation, a baseline compiler is the first compiler. It's meant to be the fastest, with the lowest priority on generating performant code. |