Hi, I ported to freepascal xxHash, very fast non-cryptographic algorithm, working near the RAM limits. Originally, it is written in C and published under the BSD license. Original C: https://code.google.com/p/xxhash/ Pascal port: http://sourceforge.net/projects/xxhashfpc/files/ Currently both 32-bit and 64-bit hashing works but only little-endian. Big-endian is not implemented. Only issue is the performance. While 64-bit hashing is good: FPC: 3200 MB/s vs. GCC 3440 MB/s (it is 93%) the 32-bit speed is much worst. GCC benchmark has two results: unaligned 2800 MB/s aligned 3330 MB/s (buffer is aligned to 16B) FPC gives 2200 MB/s and aligning buffer to 16, 32, or more bytes has no effect. It is 79% of unaligned or 66% of aligned GCC result. If someone want to help with improving performance or implement big-endian version, he can contact me here on ML or on forum (nick Blaazen). I can give him username and password to sourgeforge eventually. For curiosity, there exists also blog where author optimalized algorithm via SSE instructions. http://moinakg.wordpress.com/2013/01/19/vectorizing-xxhash-for-fun-and-profit/ Vojtěch a.k.a. Blaazen _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
