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GNU MP 4.1.2

16.8.1 Code Organisation

The various `mpn' subdirectories contain machine-dependent code, written in C or assembler. The `mpn/generic' subdirectory contains default code, used when there's no machine-specific version of a particular file.

Each `mpn' subdirectory is for an ISA family. Generally 32-bit and 64-bit variants in a family cannot share code and will have separate directories. Within a family further subdirectories may exist for CPU variants.