Import dependencies

3 years ago · fc564f19b2
43 changed files with 46485 additions and 6 deletions
--- a/19
+++ b/19
@ -0,0 +1,19 @@
+// 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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+++ b/Makefile.am
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+	ctags-recursive install-am install-strip tags-recursive
+
+.PHONY: $(RECURSIVE_CLEAN_TARGETS) $(RECURSIVE_TARGETS) CTAGS GTAGS \
+	all all-am am--refresh check check-am clean clean-generic \
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+	install install-am install-data install-data-am \
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+	install-info-am install-man install-pdf install-pdf-am \
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+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
--- a/62
+++ b/62
@ -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
--- a/196
+++ b/196
@ -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.
--- a/aclocal.m4
+++ b/aclocal.m4
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+# generated automatically by aclocal 1.11.3 -*- Autoconf -*-
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+# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
+# 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation,
+# Inc.
+# This file is free software; the Free Software Foundation
+# 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,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+You have another version of autoconf.  It may work, but is not guaranteed to.
+If you have problems, you may need to regenerate the build system entirely.
+To do so, use the procedure documented by the package, typically `autoreconf'.])])
+
+# Copyright (C) 2002, 2003, 2005, 2006, 2007, 2008, 2011 Free Software
+# Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 1
+
+# AM_AUTOMAKE_VERSION(VERSION)
+# ----------------------------
+# Automake X.Y traces this macro to ensure aclocal.m4 has been
+# generated from the m4 files accompanying Automake X.Y.
+# (This private macro should not be called outside this file.)
+AC_DEFUN([AM_AUTOMAKE_VERSION],
+[am__api_version='1.11'
+dnl Some users find AM_AUTOMAKE_VERSION and mistake it for a way to
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+m4_if([$1], [1.11.3], [],
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+# _AM_AUTOCONF_VERSION(VERSION)
+# -----------------------------
+# aclocal traces this macro to find the Autoconf version.
+# This is a private macro too.  Using m4_define simplifies
+# the logic in aclocal, which can simply ignore this definition.
+m4_define([_AM_AUTOCONF_VERSION], [])
+
+# AM_SET_CURRENT_AUTOMAKE_VERSION
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+_AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])
+
+# AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-
+
+# Copyright (C) 2001, 2003, 2005, 2011 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 1
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+# For projects using AC_CONFIG_AUX_DIR([foo]), Autoconf sets
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+])
+
+# AM_CONDITIONAL                                            -*- Autoconf -*-
+
+# Copyright (C) 1997, 2000, 2001, 2003, 2004, 2005, 2006, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
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+# serial 9
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+# AM_CONDITIONAL(NAME, SHELL-CONDITION)
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+
+# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009,
+# 2010, 2011 Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 12
+
+# There are a few dirty hacks below to avoid letting `AC_PROG_CC' be
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+      echo '#include "conftst'$i'.h"' >> sub/conftest.c
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+
+# Generate code to set up dependency tracking.              -*- Autoconf -*-
+
+# Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
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+}
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+# Do all the work for Automake.                             -*- Autoconf -*-
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+# Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
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+# serial 16
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+
+# Autoconf calls _AC_AM_CONFIG_HEADER_HOOK (when defined) in the
+# loop where config.status creates the headers, so we can generate
+# our stamp files there.
+AC_DEFUN([_AC_AM_CONFIG_HEADER_HOOK],
+[# Compute $1's index in $config_headers.
+_am_arg=$1
+_am_stamp_count=1
+for _am_header in $config_headers :; do
+  case $_am_header in
+    $_am_arg | $_am_arg:* )
+      break ;;
+    * )
+      _am_stamp_count=`expr $_am_stamp_count + 1` ;;
+  esac
+done
+echo "timestamp for $_am_arg" >`AS_DIRNAME(["$_am_arg"])`/stamp-h[]$_am_stamp_count])
+
+# Copyright (C) 2001, 2003, 2005, 2008, 2011 Free Software Foundation,
+# Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 1
+
+# AM_PROG_INSTALL_SH
+# ------------------
+# Define $install_sh.
+AC_DEFUN([AM_PROG_INSTALL_SH],
+[AC_REQUIRE([AM_AUX_DIR_EXPAND])dnl
+if test x"${install_sh}" != xset; then
+  case $am_aux_dir in
+  *\ * | *\	*)
+    install_sh="\${SHELL} '$am_aux_dir/install-sh'" ;;
+  *)
+    install_sh="\${SHELL} $am_aux_dir/install-sh"
+  esac
+fi
+AC_SUBST(install_sh)])
+
+# Copyright (C) 2003, 2005  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 2
+
+# Check whether the underlying file-system supports filenames
+# with a leading dot.  For instance MS-DOS doesn't.
+AC_DEFUN([AM_SET_LEADING_DOT],
+[rm -rf .tst 2>/dev/null
+mkdir .tst 2>/dev/null
+if test -d .tst; then
+  am__leading_dot=.
+else
+  am__leading_dot=_
+fi
+rmdir .tst 2>/dev/null
+AC_SUBST([am__leading_dot])])
+
+# Check to see how 'make' treats includes.	            -*- Autoconf -*-
+
+# Copyright (C) 2001, 2002, 2003, 2005, 2009  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 4
+
+# AM_MAKE_INCLUDE()
+# -----------------
+# Check to see how make treats includes.
+AC_DEFUN([AM_MAKE_INCLUDE],
+[am_make=${MAKE-make}
+cat > confinc << 'END'
+am__doit:
+	@echo this is the am__doit target
+.PHONY: am__doit
+END
+# If we don't find an include directive, just comment out the code.
+AC_MSG_CHECKING([for style of include used by $am_make])
+am__include="#"
+am__quote=
+_am_result=none
+# First try GNU make style include.
+echo "include confinc" > confmf
+# Ignore all kinds of additional output from `make'.
+case `$am_make -s -f confmf 2> /dev/null` in #(
+*the\ am__doit\ target*)
+  am__include=include
+  am__quote=
+  _am_result=GNU
+  ;;
+esac
+# Now try BSD make style include.
+if test "$am__include" = "#"; then
+   echo '.include "confinc"' > confmf
+   case `$am_make -s -f confmf 2> /dev/null` in #(
+   *the\ am__doit\ target*)
+     am__include=.include
+     am__quote="\""
+     _am_result=BSD
+     ;;
+   esac
+fi
+AC_SUBST([am__include])
+AC_SUBST([am__quote])
+AC_MSG_RESULT([$_am_result])
+rm -f confinc confmf
+])
+
+# Fake the existence of programs that GNU maintainers use.  -*- Autoconf -*-
+
+# Copyright (C) 1997, 1999, 2000, 2001, 2003, 2004, 2005, 2008
+# Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 6
+
+# AM_MISSING_PROG(NAME, PROGRAM)
+# ------------------------------
+AC_DEFUN([AM_MISSING_PROG],
+[AC_REQUIRE([AM_MISSING_HAS_RUN])
+$1=${$1-"${am_missing_run}$2"}
+AC_SUBST($1)])
+
+
+# AM_MISSING_HAS_RUN
+# ------------------
+# Define MISSING if not defined so far and test if it supports --run.
+# If it does, set am_missing_run to use it, otherwise, to nothing.