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COPYING
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| // Copyright (c) 2011 Google, Inc. | |||
| // | |||
| // Permission is hereby granted, free of charge, to any person obtaining a copy | |||
| // of this software and associated documentation files (the "Software"), to deal | |||
| // in the Software without restriction, including without limitation the rights | |||
| // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |||
| // copies of the Software, and to permit persons to whom the Software is | |||
| // furnished to do so, subject to the following conditions: | |||
| // | |||
| // The above copyright notice and this permission notice shall be included in | |||
| // all copies or substantial portions of the Software. | |||
| // | |||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |||
| // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |||
| // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |||
| // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |||
| // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |||
| // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |||
| // THE SOFTWARE. | |||
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Makefile.am
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| ACLOCAL_AMFLAGS = -I m4 | |||
| SUBDIRS = src | |||
| dist_doc_DATA = README NEWS COPYING | |||
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Makefile.in
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| # gives unlimited permission to copy and/or distribute it, | |||
| # with or without modifications, as long as this notice is preserved. | |||
| # This program is distributed in the hope that it will be useful, | |||
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| .NOEXPORT: | |||
+ 62
- 0
NEWS
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| @@ -0,0 +1,62 @@ | |||
| CityHash v1.1.1, June 17, 2013 | |||
| * Fix CityHash32() so platforms that disagree about whether 'char' is signed | |||
| use the same mathematical function. For most people this changes nothing | |||
| as most popular platforms agree with x86 about whether 'char' is signed. | |||
| * No changes to any of the functions, unless you had been using CityHash32() | |||
| despite "make check" reporting a failure on your platform. | |||
| * Slightly modernize and improve configuration and portability. | |||
| CityHash v1.1, October 22, 2012 | |||
| * Add CityHash32(), intended for 32-bit platforms. | |||
| * Change existing functions to improve their hash quality and/or speed. Most | |||
| of the changes were minor, but CityHashCrc* was substantially reworked | |||
| (and made perhaps 10% slower, unfortunately). | |||
| * Improve README. | |||
| CityHash v1.0.3, October 6, 2011 | |||
| * Change all the functions to improve their hash quality. Most of the | |||
| changes were minor. Special thanks to Bob Jenkins for reporting some | |||
| issues that he'd found. The speed of the functions after these changes is | |||
| roughly unchanged, except that CityHash128() and CityHash128WithSeed() are | |||
| slower. | |||
| * To improve portability, replace the one use of ssize_t with signed long. | |||
| * Improve README. | |||
| CityHash v1.0.2, May 8, 2011 | |||
| * Correct a problem in CityHashCrc256(); for inputs under 240 bytes the | |||
| scheme of padding to 240 bytes was causing the empty string and an input | |||
| of exactly 240 NULs to have the same hash code. That is now fixed. | |||
| Most strings less than 240 bytes long will have a different hash than | |||
| they did in v1.0.1. | |||
| * Other hash functions are unchanged. | |||
| * Minor corrections and improvements to README. | |||
| CityHash v1.0.1, April 28, 2011 | |||
| * Added README, NEWS, and COPYING. The README contains installation and | |||
| usage instructions, information on "hash quality," and other goodies. | |||
| * Improved how CityHash128() and CityHash128WithSeed() handle very short | |||
| input strings. | |||
| * Added new functions that are faster on long strings on 64-bit CPUs with | |||
| a CRC32 instruction: CityHashCrc128(), CityHashCrc128WithSeed(), and | |||
| CityHashCrc256(). | |||
| * Removed our assumption that "*(const uint64*)p" and such is safe. Now we | |||
| memcpy() instead. It has no speed penalty and makes our intent explicit | |||
| to the compiler. | |||
| * Changed #include "city.h" to #include <city.h>, suggested by Robert Escriva. | |||
| * Added build system, a modified version of one contributed by Robert Escriva. | |||
| * We now use __builtin_expect if the configure script can make it work, rather | |||
| than just on gcc. | |||
| * Added a test: use "make check" to run it. If you compile CityHash in a way | |||
| that causes it to return unexpected results, the test should fail. | |||
| * Added untested big-endian support. Please let us know if you try it! | |||
| * Other than CityHash128() and CityHash128WithSeed(), the hash functions in | |||
| the previous release are unchanged. | |||
| CityHash v1, April 11, 2011 | |||
| * Initial release | |||
+ 196
- 0
README
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| @@ -0,0 +1,196 @@ | |||
| CityHash, a family of hash functions for strings. | |||
| Introduction | |||
| ============ | |||
| CityHash provides hash functions for strings. The functions mix the | |||
| input bits thoroughly but are not suitable for cryptography. See | |||
| "Hash Quality," below, for details on how CityHash was tested and so on. | |||
| We provide reference implementations in C++, with a friendly MIT license. | |||
| CityHash32() returns a 32-bit hash. | |||
| CityHash64() and similar return a 64-bit hash. | |||
| CityHash128() and similar return a 128-bit hash and are tuned for | |||
| strings of at least a few hundred bytes. Depending on your compiler | |||
| and hardware, it's likely faster than CityHash64() on sufficiently long | |||
| strings. It's slower than necessary on shorter strings, but we expect | |||
| that case to be relatively unimportant. | |||
| CityHashCrc128() and similar are variants of CityHash128() that depend | |||
| on _mm_crc32_u64(), an intrinsic that compiles to a CRC32 instruction | |||
| on some CPUs. However, none of the functions we provide are CRCs. | |||
| CityHashCrc256() is a variant of CityHashCrc128() that also depends | |||
| on _mm_crc32_u64(). It returns a 256-bit hash. | |||
| All members of the CityHash family were designed with heavy reliance | |||
| on previous work by Austin Appleby, Bob Jenkins, and others. | |||
| For example, CityHash32 has many similarities with Murmur3a. | |||
| Performance on long strings: 64-bit CPUs | |||
| ======================================== | |||
| We are most excited by the performance of CityHash64() and its variants on | |||
| short strings, but long strings are interesting as well. | |||
| CityHash is intended to be fast, under the constraint that it hash very | |||
| well. For CPUs with the CRC32 instruction, CRC is speedy, but CRC wasn't | |||
| designed as a hash function and shouldn't be used as one. CityHashCrc128() | |||
| is not a CRC, but it uses the CRC32 machinery. | |||
| On a single core of a 2.67GHz Intel Xeon X5550, CityHashCrc256 peaks at about | |||
| 5 to 5.5 bytes/cycle. The other CityHashCrc functions are wrappers around | |||
| CityHashCrc256 and should have similar performance on long strings. | |||
| (CityHashCrc256 in v1.0.3 was even faster, but we decided it wasn't as thorough | |||
| as it should be.) CityHash128 peaks at about 4.3 bytes/cycle. The fastest | |||
| Murmur variant on that hardware, Murmur3F, peaks at about 2.4 bytes/cycle. | |||
| We expect the peak speed of CityHash128 to dominate CityHash64, which is | |||
| aimed more toward short strings or use in hash tables. | |||
| For long strings, a new function by Bob Jenkins, SpookyHash, is just | |||
| slightly slower than CityHash128 on Intel x86-64 CPUs, but noticeably | |||
| faster on AMD x86-64 CPUs. For hashing long strings on AMD CPUs | |||
| and/or CPUs without the CRC instruction, SpookyHash may be just as | |||
| good or better than any of the CityHash variants. | |||
| Performance on short strings: 64-bit CPUs | |||
| ========================================= | |||
| For short strings, e.g., most hash table keys, CityHash64 is faster than | |||
| CityHash128, and probably faster than all the aforementioned functions, | |||
| depending on the mix of string lengths. Here are a few results from that | |||
| same hardware, where we (unrealistically) tested a single string length over | |||
| and over again: | |||
| Hash Results | |||
| ------------------------------------------------------------------------------ | |||
| CityHash64 v1.0.3 7ns for 1 byte, or 6ns for 8 bytes, or 9ns for 64 bytes | |||
| Murmur2 (64-bit) 6ns for 1 byte, or 6ns for 8 bytes, or 15ns for 64 bytes | |||
| Murmur3F 14ns for 1 byte, or 15ns for 8 bytes, or 23ns for 64 bytes | |||
| We don't have CityHash64 benchmarks results for v1.1, but we expect the | |||
| numbers to be similar. | |||
| Performance: 32-bit CPUs | |||
| ======================== | |||
| CityHash32 is the newest variant of CityHash. It is intended for | |||
| 32-bit hardware in general but has been mostly tested on x86. Our benchmarks | |||
| suggest that Murmur3 is the nearest competitor to CityHash32 on x86. | |||
| We don't know of anything faster that has comparable quality. The speed rankings | |||
| in our testing: CityHash32 > Murmur3f > Murmur3a (for long strings), and | |||
| CityHash32 > Murmur3a > Murmur3f (for short strings). | |||
| Installation | |||
| ============ | |||
| We provide reference implementations of several CityHash functions, written | |||
| in C++. The build system is based on autoconf. It defaults the C++ | |||
| compiler flags to "-g -O2", which is probably slower than -O3 if you are | |||
| using gcc. YMMV. | |||
| On systems with gcc, we generally recommend: | |||
| ./configure | |||
| make all check CXXFLAGS="-g -O3" | |||
| sudo make install | |||
| Or, if your system has the CRC32 instruction, and you want to build everything: | |||
| ./configure --enable-sse4.2 | |||
| make all check CXXFLAGS="-g -O3 -msse4.2" | |||
| sudo make install | |||
| Note that our build system doesn't try to determine the appropriate compiler | |||
| flag for enabling SSE4.2. For gcc it is "-msse4.2". The --enable-sse4.2 | |||
| flag to the configure script controls whether citycrc.h is installed when | |||
| you "make install." In general, picking the right compiler flags can be | |||
| tricky, and may depend on your compiler, your hardware, and even how you | |||
| plan to use the library. | |||
| For generic information about how to configure this software, please try: | |||
| ./configure --help | |||
| Failing that, please work from city.cc and city*.h, as they contain all the | |||
| necessary code. | |||
| Usage | |||
| ===== | |||
| The above installation instructions will produce a single library. It will | |||
| contain CityHash32(), CityHash64(), and CityHash128(), and their variants, | |||
| and possibly CityHashCrc128(), CityHashCrc128WithSeed(), and | |||
| CityHashCrc256(). The functions with Crc in the name are declared in | |||
| citycrc.h; the rest are declared in city.h. | |||
| Limitations | |||
| =========== | |||
| 1) CityHash32 is intended for little-endian 32-bit code, and everything else in | |||
| the current version of CityHash is intended for little-endian 64-bit CPUs. | |||
| All functions that don't use the CRC32 instruction should work in | |||
| little-endian 32-bit or 64-bit code. CityHash should work on big-endian CPUs | |||
| as well, but we haven't tested that very thoroughly yet. | |||
| 2) CityHash is fairly complex. As a result of its complexity, it may not | |||
| perform as expected on some compilers. For example, preliminary reports | |||
| suggest that some Microsoft compilers compile CityHash to assembly that's | |||
| 10-20% slower than it could be. | |||
| Hash Quality | |||
| ============ | |||
| We like to test hash functions with SMHasher, among other things. | |||
| SMHasher isn't perfect, but it seems to find almost any significant flaw. | |||
| SMHasher is available at http://code.google.com/p/smhasher/ | |||
| SMHasher is designed to pass a 32-bit seed to the hash functions it tests. | |||
| No CityHash function is designed to work that way, so we adapt as follows: | |||
| For our functions that accept a seed, we use the given seed directly (padded | |||
| with zeroes); for our functions that don't accept a seed, we hash the | |||
| concatenation of the given seed and the input string. | |||
| The CityHash functions have the following flaws according to SMHasher: | |||
| (1) CityHash64: none | |||
| (2) CityHash64WithSeed: none | |||
| (3) CityHash64WithSeeds: did not test | |||
| (4) CityHash128: none | |||
| (5) CityHash128WithSeed: none | |||
| (6) CityHashCrc128: none | |||
| (7) CityHashCrc128WithSeed: none | |||
| (8) CityHashCrc256: none | |||
| (9) CityHash32: none | |||
| Some minor flaws in 32-bit and 64-bit functions are harmless, as we | |||
| expect the primary use of these functions will be in hash tables. We | |||
| may have gone slightly overboard in trying to please SMHasher and other | |||
| similar tests, but we don't want anyone to choose a different hash function | |||
| because of some minor issue reported by a quality test. | |||
| For more information | |||
| ==================== | |||
| http://code.google.com/p/cityhash/ | |||
| cityhash-discuss@googlegroups.com | |||
| Please feel free to send us comments, questions, bug reports, or patches. | |||
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| # Inc. | |||
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| AC_MSG_CHECKING([how to create a $1 tar archive]) | |||
| # Loop over all known methods to create a tar archive until one works. | |||
| _am_tools='gnutar m4_if([$1], [ustar], [plaintar]) pax cpio none' | |||
| _am_tools=${am_cv_prog_tar_$1-$_am_tools} | |||
| # Do not fold the above two line into one, because Tru64 sh and | |||
| # Solaris sh will not grok spaces in the rhs of `-'. | |||
| for _am_tool in $_am_tools | |||
| do | |||
| case $_am_tool in | |||
| gnutar) | |||
| for _am_tar in tar gnutar gtar; | |||
| do | |||
| AM_RUN_LOG([$_am_tar --version]) && break | |||
| done | |||
| am__tar="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$$tardir"' | |||
| am__tar_="$_am_tar --format=m4_if([$1], [pax], [posix], [$1]) -chf - "'"$tardir"' | |||
| am__untar="$_am_tar -xf -" | |||
| ;; | |||
| plaintar) | |||
| # Must skip GNU tar: if it does not support --format= it doesn't create | |||
| # ustar tarball either. | |||
| (tar --version) >/dev/null 2>&1 && continue | |||
| am__tar='tar chf - "$$tardir"' | |||
| am__tar_='tar chf - "$tardir"' | |||
| am__untar='tar xf -' | |||
| ;; | |||
| pax) | |||
| am__tar='pax -L -x $1 -w "$$tardir"' | |||
| am__tar_='pax -L -x $1 -w "$tardir"' | |||
| am__untar='pax -r' | |||
| ;; | |||
| cpio) | |||
| am__tar='find "$$tardir" -print | cpio -o -H $1 -L' | |||
| am__tar_='find "$tardir" -print | cpio -o -H $1 -L' | |||
| am__untar='cpio -i -H $1 -d' | |||
| ;; | |||
| none) | |||
| am__tar=false | |||
| am__tar_=false | |||
| am__untar=false | |||
| ;; | |||
| esac | |||
| # If the value was cached, stop now. We just wanted to have am__tar | |||
| # and am__untar set. | |||
| test -n "${am_cv_prog_tar_$1}" && break | |||
| # tar/untar a dummy directory, and stop if the command works | |||
| rm -rf conftest.dir | |||
| mkdir conftest.dir | |||
| echo GrepMe > conftest.dir/file | |||
| AM_RUN_LOG([tardir=conftest.dir && eval $am__tar_ >conftest.tar]) | |||
| rm -rf conftest.dir | |||
| if test -s conftest.tar; then | |||
| AM_RUN_LOG([$am__untar <conftest.tar]) | |||
| grep GrepMe conftest.dir/file >/dev/null 2>&1 && break | |||
| fi | |||
| done | |||
| rm -rf conftest.dir | |||
| AC_CACHE_VAL([am_cv_prog_tar_$1], [am_cv_prog_tar_$1=$_am_tool]) | |||
| AC_MSG_RESULT([$am_cv_prog_tar_$1])]) | |||
| AC_SUBST([am__tar]) | |||
| AC_SUBST([am__untar]) | |||
| ]) # _AM_PROG_TAR | |||
| m4_include([m4/libtool.m4]) | |||
| m4_include([m4/ltoptions.m4]) | |||
| m4_include([m4/ltsugar.m4]) | |||
| m4_include([m4/ltversion.m4]) | |||
| m4_include([m4/lt~obsolete.m4]) | |||
BIN
build/.ninja_deps
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+ 4
- 0
build/.ninja_log
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| @@ -0,0 +1,4 @@ | |||
| # ninja log v5 | |||
| 0 3734 0 build.ninja 59aebd2f581b44c5 | |||
| 0 874 0 cityhash@sha/src_city.cc.o bfd9bcb65a42ae9d | |||
| 878 1102 0 libcityhash.so b223c3adac31d6ac | |||
+ 139
- 0
build/build.ninja
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| @@ -0,0 +1,139 @@ | |||
| # This is the build file for project "cityhash" | |||
| # It is autogenerated by the Meson build system. | |||
| # Do not edit by hand. | |||
| ninja_required_version = 1.5.1 | |||
| # Rules for compiling. | |||
| rule llvm_ir_COMPILER | |||
| command = sc++ $ARGS -o $out -c $in | |||
| description = Compiling LLVM IR object $in. | |||
| rule cpp_COMPILER | |||
| command = sc++ $ARGS -MD -MQ $out -MF '$DEPFILE' -o $out -c $in | |||
| deps = gcc | |||
| depfile = $DEPFILE | |||
| description = Compiling C++ object $out. | |||
| rule cpp_PCH | |||
| command = sc++ $ARGS -MD -MQ $out -MF '$DEPFILE' -o $out -c $in | |||
| deps = gcc | |||
| depfile = $DEPFILE | |||
| description = Precompiling header $in. | |||
| # Rules for linking. | |||
| rule STATIC_LINKER | |||
| command = rm -f $out && ar $LINK_ARGS $out $in | |||
| description = Linking static target $out. | |||
| rule cpp_LINKER | |||
| command = sc++ $ARGS -o $out $in $LINK_ARGS $aliasing | |||
| description = Linking target $out. | |||
| rule SHSYM | |||
| command = /usr/bin/python3.6 /usr/local/bin/meson --internal symbolextractor $in $out $CROSS | |||
| restat = 1 | |||
| description = Generating symbol file $out. | |||
| # Other rules | |||
| rule CUSTOM_COMMAND | |||
| command = $COMMAND | |||
| description = $DESC | |||
| restat = 1 | |||
| rule CUSTOM_COMMAND_DEP | |||
| command = $COMMAND | |||
| description = $DESC | |||
| deps = gcc | |||
| depfile = $DEPFILE | |||
| restat = 1 | |||