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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.