63 rader
2.9 KiB
Plaintext
63 rader
2.9 KiB
Plaintext
CityHash v1.1.1, June 17, 2013
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* Fix CityHash32() so platforms that disagree about whether 'char' is signed
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use the same mathematical function. For most people this changes nothing
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as most popular platforms agree with x86 about whether 'char' is signed.
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* No changes to any of the functions, unless you had been using CityHash32()
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despite "make check" reporting a failure on your platform.
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* Slightly modernize and improve configuration and portability.
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CityHash v1.1, October 22, 2012
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* Add CityHash32(), intended for 32-bit platforms.
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* Change existing functions to improve their hash quality and/or speed. Most
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of the changes were minor, but CityHashCrc* was substantially reworked
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(and made perhaps 10% slower, unfortunately).
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* Improve README.
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CityHash v1.0.3, October 6, 2011
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* Change all the functions to improve their hash quality. Most of the
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changes were minor. Special thanks to Bob Jenkins for reporting some
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issues that he'd found. The speed of the functions after these changes is
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roughly unchanged, except that CityHash128() and CityHash128WithSeed() are
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slower.
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* To improve portability, replace the one use of ssize_t with signed long.
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* Improve README.
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CityHash v1.0.2, May 8, 2011
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* Correct a problem in CityHashCrc256(); for inputs under 240 bytes the
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scheme of padding to 240 bytes was causing the empty string and an input
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of exactly 240 NULs to have the same hash code. That is now fixed.
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Most strings less than 240 bytes long will have a different hash than
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they did in v1.0.1.
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* Other hash functions are unchanged.
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* Minor corrections and improvements to README.
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CityHash v1.0.1, April 28, 2011
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* Added README, NEWS, and COPYING. The README contains installation and
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usage instructions, information on "hash quality," and other goodies.
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* Improved how CityHash128() and CityHash128WithSeed() handle very short
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input strings.
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* Added new functions that are faster on long strings on 64-bit CPUs with
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a CRC32 instruction: CityHashCrc128(), CityHashCrc128WithSeed(), and
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CityHashCrc256().
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* Removed our assumption that "*(const uint64*)p" and such is safe. Now we
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memcpy() instead. It has no speed penalty and makes our intent explicit
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to the compiler.
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* Changed #include "city.h" to #include <city.h>, suggested by Robert Escriva.
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* Added build system, a modified version of one contributed by Robert Escriva.
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* We now use __builtin_expect if the configure script can make it work, rather
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than just on gcc.
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* Added a test: use "make check" to run it. If you compile CityHash in a way
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that causes it to return unexpected results, the test should fail.
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* Added untested big-endian support. Please let us know if you try it!
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* Other than CityHash128() and CityHash128WithSeed(), the hash functions in
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the previous release are unchanged.
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CityHash v1, April 11, 2011
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* Initial release
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