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# Chapter 21: Instruction Encoding and ELF
+[Previous: Chapter 20](../chapter20/README.md) |
+[Next: Chapter 22](../chapter22/README.md)
+
This chapter turns the scheduled, register-allocated graph into executable
instructions. Each machine node writes its bytes; the compiler places blocks,
resolves local references, and exports an ELF object for the linker. We can now