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(gmp.info)Assembler Code Organisation

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Code Organisation
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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.