Copyright 1996, 1999 Free Software Foundation, Inc. This file is part of the GNU MP Library. The GNU MP Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. The GNU MP Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. This directory contains all code for the mpn layer of GMP. Most subdirectories contain machine-dependent code, written in assembly or C. The `generic' subdirectory contains default code, used when there is no machine-dependent replacement for a particular machine. There is one subdirectory for each ISA family. Note that e.g., 32-bit SPARC and 64-bit SPARC are very different ISA's, and thus cannot share any code. A particular compile will only use code from one subdirectory, and the `generic' subdirectory. The ISA-specific subdirectories contain hierachies of directories for various architecture variants and implementations; the top-most level contains code that runs correctly on all variants.