diff options
38 files changed, 2730 insertions, 0 deletions
diff --git a/.appveyor.yml b/.appveyor.yml new file mode 100644 index 0000000000..7345746750 --- /dev/null +++ b/.appveyor.yml @@ -0,0 +1,37 @@ +# Build matrix / environment variables are explained on: +# https://www.appveyor.com/docs/appveyor-yml/ +# This file can be validated on: https://ci.appveyor.com/tools/validate-yaml + +version: "{build}" + +environment: + matrix: + # AppVeyor currently has no custom job name feature. + # http://help.appveyor.com/discussions/questions/1623-can-i-provide-a-friendly-name-for-jobs + - JOB: Visual Studio 2017 + APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017 + CMAKE_GENERATOR: Visual Studio 15 2017 + +platform: + - x86 + - x64 + +configuration: + - RelWithDebInfo + - Debug + +build_script: + - git submodule update --init --recursive + - mkdir build + - cd build + - if "%platform%"=="x64" set CMAKE_GENERATOR=%CMAKE_GENERATOR% Win64 + - cmake --version + - cmake .. -G "%CMAKE_GENERATOR%" -DCRC32C_USE_GLOG=0 + -DCMAKE_CONFIGURATION_TYPES="%CONFIGURATION%" + - cmake --build . --config "%CONFIGURATION%" + - cd .. + +test_script: + - build\%CONFIGURATION%\crc32c_tests.exe + - build\%CONFIGURATION%\crc32c_capi_tests.exe + - build\%CONFIGURATION%\crc32c_bench.exe diff --git a/.clang-format b/.clang-format new file mode 100644 index 0000000000..be9b80799f --- /dev/null +++ b/.clang-format @@ -0,0 +1,3 @@ +--- +Language: Cpp +BasedOnStyle: Google diff --git a/.clang_complete b/.clang_complete new file mode 100644 index 0000000000..fa6757c6f3 --- /dev/null +++ b/.clang_complete @@ -0,0 +1,8 @@ +-Ibuild/include/ +-Ibuild/third_party/glog/ +-Iinclude/ +-Ithird_party/benchmark/include/ +-Ithird_party/googletest/googletest/include/ +-Ithird_party/googletest/googlemock/include/ +-Ithird_party/glog/src/ +-std=c++11 diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000000..61769727e3 --- /dev/null +++ b/.gitignore @@ -0,0 +1,8 @@ +# Editors. +*.sw* +.DS_Store +/.vscode + +# Build directory. +build/ +out/ diff --git a/.gitmodules b/.gitmodules new file mode 100644 index 0000000000..e69de29bb2 --- /dev/null +++ b/.gitmodules diff --git a/.travis.yml b/.travis.yml new file mode 100644 index 0000000000..d990a89f07 --- /dev/null +++ b/.travis.yml @@ -0,0 +1,76 @@ +# Build matrix / environment variables are explained on: +# http://about.travis-ci.org/docs/user/build-configuration/ +# This file can be validated on: http://lint.travis-ci.org/ + +language: cpp +dist: bionic +osx_image: xcode10.3 + +compiler: +- gcc +- clang +os: +- linux +- osx + +env: +- GLOG=1 SHARED_LIB=0 BUILD_TYPE=Debug +- GLOG=1 SHARED_LIB=0 BUILD_TYPE=RelWithDebInfo +- GLOG=0 SHARED_LIB=0 BUILD_TYPE=Debug +- GLOG=0 SHARED_LIB=0 BUILD_TYPE=RelWithDebInfo +- GLOG=0 SHARED_LIB=1 BUILD_TYPE=Debug +- GLOG=0 SHARED_LIB=1 BUILD_TYPE=RelWithDebInfo + +addons: + apt: + sources: + - sourceline: 'deb http://apt.llvm.org/bionic/ llvm-toolchain-bionic-9 main' + key_url: 'https://apt.llvm.org/llvm-snapshot.gpg.key' + - sourceline: 'ppa:ubuntu-toolchain-r/test' + packages: + - clang-9 + - cmake + - gcc-9 + - g++-9 + - ninja-build + homebrew: + packages: + - cmake + - gcc@9 + - llvm@9 + - ninja + update: true + +install: +# The following Homebrew packages aren't linked by default, and need to be +# prepended to the path explicitly. +- if [ "$TRAVIS_OS_NAME" = "osx" ]; then + export PATH="$(brew --prefix llvm)/bin:$PATH"; + fi +# /usr/bin/gcc points to an older compiler on both Linux and macOS. +- if [ "$CXX" = "g++" ]; then export CXX="g++-9" CC="gcc-9"; fi +# /usr/bin/clang points to an older compiler on both Linux and macOS. +# +# Homebrew's llvm package doesn't ship a versioned clang++ binary, so the values +# below don't work on macOS. Fortunately, the path change above makes the +# default values (clang and clang++) resolve to the correct compiler on macOS. +- if [ "$TRAVIS_OS_NAME" = "linux" ]; then + if [ "$CXX" = "clang++" ]; then export CXX="clang++-9" CC="clang-9"; fi; + fi +- echo ${CC} +- echo ${CXX} +- ${CXX} --version +- cmake --version + +before_script: +- mkdir -p build && cd build +- cmake .. -G Ninja -DCRC32C_USE_GLOG=$GLOG -DCMAKE_BUILD_TYPE=$BUILD_TYPE + -DBUILD_SHARED_LIBS=$SHARED_LIB -DCMAKE_INSTALL_PREFIX=$HOME/.local +- cmake --build . +- cd .. + +script: +- build/crc32c_tests +- build/crc32c_capi_tests +- build/crc32c_bench +- cd build && cmake --build . --target install diff --git a/.ycm_extra_conf.py b/.ycm_extra_conf.py new file mode 100644 index 0000000000..536aadcec8 --- /dev/null +++ b/.ycm_extra_conf.py @@ -0,0 +1,142 @@ +# Copyright 2017 The CRC32C Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. +"""YouCompleteMe configuration that interprets a .clang_complete file. + +This module implementes the YouCompleteMe configuration API documented at: +https://github.com/Valloric/ycmd#ycm_extra_confpy-specification + +The implementation loads and processes a .clang_complete file, documented at: +https://github.com/Rip-Rip/clang_complete/blob/master/README.md +""" + +import os + +# Flags added to the list in .clang_complete. +BASE_FLAGS = [ + '-Werror', # Unlike clang_complete, YCM can also be used as a linter. + '-DUSE_CLANG_COMPLETER', # YCM needs this. + '-xc++', # YCM needs this to avoid compiling headers as C code. +] + +# Clang flags that take in paths. +# See https://clang.llvm.org/docs/ClangCommandLineReference.html +PATH_FLAGS = [ + '-isystem', + '-I', + '-iquote', + '--sysroot=' +] + + +def DirectoryOfThisScript(): + """Returns the absolute path to the directory containing this script.""" + return os.path.dirname(os.path.abspath(__file__)) + + +def MakeRelativePathsInFlagsAbsolute(flags, build_root): + """Expands relative paths in a list of Clang command-line flags. + + Args: + flags: The list of flags passed to Clang. + build_root: The current directory when running the Clang compiler. Should be + an absolute path. + + Returns: + A list of flags with relative paths replaced by absolute paths. + """ + new_flags = [] + make_next_absolute = False + for flag in flags: + new_flag = flag + + if make_next_absolute: + make_next_absolute = False + if not flag.startswith('/'): + new_flag = os.path.join(build_root, flag) + + for path_flag in PATH_FLAGS: + if flag == path_flag: + make_next_absolute = True + break + + if flag.startswith(path_flag): + path = flag[len(path_flag):] + new_flag = path_flag + os.path.join(build_root, path) + break + + if new_flag: + new_flags.append(new_flag) + return new_flags + + +def FindNearest(target, path, build_root): + """Looks for a file with a specific name closest to a project path. + + This is similar to the logic used by a version-control system (like git) to + find its configuration directory (.git) based on the current directory when a + command is invoked. + + Args: + target: The file name to search for. + path: The directory where the search starts. The search will explore the + given directory's ascendants using the parent relationship. Should be an + absolute path. + build_root: A directory that acts as a fence for the search. If the search + reaches this directory, it will not advance to its parent. Should be an + absolute path. + + Returns: + The path to a file with the desired name. None if the search failed. + """ + candidate = os.path.join(path, target) + if os.path.isfile(candidate): + return candidate + + if path == build_root: + return None + + parent = os.path.dirname(path) + if parent == path: + return None + + return FindNearest(target, parent, build_root) + + +def FlagsForClangComplete(file_path, build_root): + """Reads the .clang_complete flags for a source file. + + Args: + file_path: The path to the source file. Should be inside the project. Used + to locate the relevant .clang_complete file. + build_root: The current directory when running the Clang compiler for this + file. Should be an absolute path. + + Returns: + A list of strings, where each element is a Clang command-line flag. + """ + clang_complete_path = FindNearest('.clang_complete', file_path, build_root) + if clang_complete_path is None: + return None + clang_complete_flags = open(clang_complete_path, 'r').read().splitlines() + return clang_complete_flags + + +def FlagsForFile(filename, **kwargs): + """Implements the YouCompleteMe API.""" + + # kwargs can be used to pass 'client_data' to the YCM configuration. This + # configuration script does not need any extra information, so + # pylint: disable=unused-argument + + build_root = DirectoryOfThisScript() + file_path = os.path.realpath(filename) + + flags = BASE_FLAGS + clang_flags = FlagsForClangComplete(file_path, build_root) + if clang_flags: + flags += clang_flags + + final_flags = MakeRelativePathsInFlagsAbsolute(flags, build_root) + + return {'flags': final_flags} diff --git a/AUTHORS b/AUTHORS new file mode 100644 index 0000000000..6f1f6871a6 --- /dev/null +++ b/AUTHORS @@ -0,0 +1,9 @@ +# This is the list of CRC32C authors for copyright purposes. +# +# This does not necessarily list everyone who has contributed code, since in +# some cases, their employer may be the copyright holder. To see the full list +# of contributors, see the revision history in source control. +Google Inc. + +Fangming Fang <Fangming.Fang@arm.com> +Vadim Skipin <vadim.skipin@gmail.com> diff --git a/CMakeLists.txt b/CMakeLists.txt new file mode 100644 index 0000000000..111a3e3614 --- /dev/null +++ b/CMakeLists.txt @@ -0,0 +1,423 @@ +# Copyright 2017 The CRC32C Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. See the AUTHORS file for names of contributors. + +cmake_minimum_required(VERSION 3.1) +project(Crc32c VERSION 1.1.0 LANGUAGES C CXX) + +# This project can use C11, but will gracefully decay down to C89. +set(CMAKE_C_STANDARD 11) +set(CMAKE_C_STANDARD_REQUIRED OFF) +set(CMAKE_C_EXTENSIONS OFF) + +# This project requires C++11. +set(CMAKE_CXX_STANDARD 11) +set(CMAKE_CXX_STANDARD_REQUIRED ON) +set(CMAKE_CXX_EXTENSIONS OFF) + +# https://github.com/izenecloud/cmake/blob/master/SetCompilerWarningAll.cmake +if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + # Use the highest warning level for Visual Studio. + set(CMAKE_CXX_WARNING_LEVEL 4) + if(CMAKE_CXX_FLAGS MATCHES "/W[0-4]") + string(REGEX REPLACE "/W[0-4]" "/W4" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + else(CMAKE_CXX_FLAGS MATCHES "/W[0-4]") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /W4") + endif(CMAKE_CXX_FLAGS MATCHES "/W[0-4]") + + # Disable C++ exceptions. + string(REGEX REPLACE "/EH[a-z]+" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /EHs-c-") + add_definitions(-D_HAS_EXCEPTIONS=0) + + # Disable RTTI. + string(REGEX REPLACE "/GR" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /GR-") +else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + # Use -Wall for clang and gcc. + if(NOT CMAKE_CXX_FLAGS MATCHES "-Wall") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall") + endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wall") + + # Use -Wextra for clang and gcc. + if(NOT CMAKE_CXX_FLAGS MATCHES "-Wextra") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wextra") + endif(NOT CMAKE_CXX_FLAGS MATCHES "-Wextra") + + # Use -Werror for clang and gcc. + if(NOT CMAKE_CXX_FLAGS MATCHES "-Werror") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror") + endif(NOT CMAKE_CXX_FLAGS MATCHES "-Werror") + + # Disable C++ exceptions. + string(REGEX REPLACE "-fexceptions" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-exceptions") + + # Disable RTTI. + string(REGEX REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}") + set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-rtti") +endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + +option(CRC32C_BUILD_TESTS "Build CRC32C's unit tests" ON) +option(CRC32C_BUILD_BENCHMARKS "Build CRC32C's benchmarks" ON) +option(CRC32C_USE_GLOG "Build CRC32C's tests with Google Logging" ON) +option(CRC32C_INSTALL "Install CRC32C's header and library" ON) + +include(TestBigEndian) +test_big_endian(BYTE_ORDER_BIG_ENDIAN) + +include(CheckCXXCompilerFlag) +# Used by glog. +check_cxx_compiler_flag(-Wno-deprecated CRC32C_HAVE_NO_DEPRECATED) +# Used by glog. +check_cxx_compiler_flag(-Wno-sign-compare CRC32C_HAVE_NO_SIGN_COMPARE) +# Used by glog. +check_cxx_compiler_flag(-Wno-unused-parameter CRC32C_HAVE_NO_UNUSED_PARAMETER) +# Used by googletest. +check_cxx_compiler_flag(-Wno-missing-field-initializers + CRC32C_HAVE_NO_MISSING_FIELD_INITIALIZERS) + +# Check for __builtin_prefetch support in the compiler. +include(CheckCXXSourceCompiles) +check_cxx_source_compiles(" +int main() { + char data = 0; + const char* address = &data; + __builtin_prefetch(address, 0, 0); + return 0; +} +" HAVE_BUILTIN_PREFETCH) + +# Check for _mm_prefetch support in the compiler. +include(CheckCXXSourceCompiles) +check_cxx_source_compiles(" +#if defined(_MSC_VER) +#include <intrin.h> +#else // !defined(_MSC_VER) +#include <xmmintrin.h> +#endif // defined(_MSC_VER) + +int main() { + char data = 0; + const char* address = &data; + _mm_prefetch(address, _MM_HINT_NTA); + return 0; +} +" HAVE_MM_PREFETCH) + +# Check for SSE4.2 support in the compiler. +set(OLD_CMAKE_REQURED_FLAGS ${CMAKE_REQUIRED_FLAGS}) +if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} /arch:AVX") +else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -msse4.2") +endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") +check_cxx_source_compiles(" +#if defined(_MSC_VER) +#include <intrin.h> +#else // !defined(_MSC_VER) +#include <cpuid.h> +#include <nmmintrin.h> +#endif // defined(_MSC_VER) + +int main() { + _mm_crc32_u8(0, 0); _mm_crc32_u32(0, 0); +#if defined(_M_X64) || defined(__x86_64__) + _mm_crc32_u64(0, 0); +#endif // defined(_M_X64) || defined(__x86_64__) + return 0; +} +" HAVE_SSE42) +set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQURED_FLAGS}) + +# Check for ARMv8 w/ CRC and CRYPTO extensions support in the compiler. +set(OLD_CMAKE_REQURED_FLAGS ${CMAKE_REQUIRED_FLAGS}) +if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + # TODO(pwnall): Insert correct flag when VS gets ARM CRC32C support. + set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} /arch:NOTYET") +else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set(CMAKE_REQUIRED_FLAGS "${CMAKE_REQUIRED_FLAGS} -march=armv8-a+crc+crypto") +endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") +check_cxx_source_compiles(" +#include <arm_acle.h> +#include <arm_neon.h> + +int main() { + __crc32cb(0, 0); __crc32ch(0, 0); __crc32cw(0, 0); __crc32cd(0, 0); + vmull_p64(0, 0); + return 0; +} +" HAVE_ARM64_CRC32C) +set(CMAKE_REQUIRED_FLAGS ${OLD_CMAKE_REQURED_FLAGS}) + +# Check for strong getauxval() support in the system headers. +check_cxx_source_compiles(" +#include <arm_acle.h> +#include <arm_neon.h> +#include <sys/auxv.h> + +int main() { + getauxval(AT_HWCAP); + return 0; +} +" HAVE_STRONG_GETAUXVAL) + +# Check for weak getauxval() support in the compiler. +check_cxx_source_compiles(" +unsigned long getauxval(unsigned long type) __attribute__((weak)); +#define AT_HWCAP 16 + +int main() { + getauxval(AT_HWCAP); + return 0; +} +" HAVE_WEAK_GETAUXVAL) + +if(CRC32C_USE_GLOG) + # glog requires this setting to avoid using dynamic_cast. + set(DISABLE_RTTI ON CACHE BOOL "" FORCE) + + # glog's test targets trigger deprecation warnings, and compiling them burns + # CPU cycles on the CI. + set(BUILD_TESTING_SAVED "${BUILD_TESTING}") + set(BUILD_TESTING OFF CACHE BOOL "" FORCE) + add_subdirectory("third_party/glog" EXCLUDE_FROM_ALL) + set(BUILD_TESTING "${BUILD_TESTING_SAVED}" CACHE BOOL "" FORCE) + + # glog triggers deprecation warnings on OSX. + # https://github.com/google/glog/issues/185 + if(CRC32C_HAVE_NO_DEPRECATED) + set_property(TARGET glog APPEND PROPERTY COMPILE_OPTIONS -Wno-deprecated) + endif(CRC32C_HAVE_NO_DEPRECATED) + + # glog triggers sign comparison warnings on gcc. + if(CRC32C_HAVE_NO_SIGN_COMPARE) + set_property(TARGET glog APPEND PROPERTY COMPILE_OPTIONS -Wno-sign-compare) + endif(CRC32C_HAVE_NO_SIGN_COMPARE) + + # glog triggers unused parameter warnings on clang. + if(CRC32C_HAVE_NO_UNUSED_PARAMETER) + set_property(TARGET glog + APPEND PROPERTY COMPILE_OPTIONS -Wno-unused-parameter) + endif(CRC32C_HAVE_NO_UNUSED_PARAMETER) + + set(CRC32C_TESTS_BUILT_WITH_GLOG 1) +endif(CRC32C_USE_GLOG) + +configure_file( + "src/crc32c_config.h.in" + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" +) + +include_directories("${PROJECT_BINARY_DIR}/include") + +# ARM64 CRC32C code is built separately, so we don't accidentally compile +# unsupported instructions into code that gets run without ARM32 support. +add_library(crc32c_arm64 OBJECT "") +target_sources(crc32c_arm64 + PRIVATE + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" + "src/crc32c_arm64.cc" + "src/crc32c_arm64.h" +) +if(HAVE_ARM64_CRC32C) + if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + # TODO(pwnall): Insert correct flag when VS gets ARM64 CRC32C support. + target_compile_options(crc32c_arm64 PRIVATE "/arch:NOTYET") + else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + target_compile_options(crc32c_arm64 PRIVATE "-march=armv8-a+crc+crypto") + endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") +endif(HAVE_ARM64_CRC32C) + +# CMake only enables PIC by default in SHARED and MODULE targets. +if(BUILD_SHARED_LIBS) + set_property(TARGET crc32c_arm64 PROPERTY POSITION_INDEPENDENT_CODE TRUE) +endif(BUILD_SHARED_LIBS) + +# SSE4.2 code is built separately, so we don't accidentally compile unsupported +# instructions into code that gets run without SSE4.2 support. +add_library(crc32c_sse42 OBJECT "") +target_sources(crc32c_sse42 + PRIVATE + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" + "src/crc32c_sse42.cc" + "src/crc32c_sse42.h" +) +if(HAVE_SSE42) + if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + target_compile_options(crc32c_sse42 PRIVATE "/arch:AVX") + else(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + target_compile_options(crc32c_sse42 PRIVATE "-msse4.2") + endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") +endif(HAVE_SSE42) + +# CMake only enables PIC by default in SHARED and MODULE targets. +if(BUILD_SHARED_LIBS) + set_property(TARGET crc32c_sse42 PROPERTY POSITION_INDEPENDENT_CODE TRUE) +endif(BUILD_SHARED_LIBS) + +# Must be included before CMAKE_INSTALL_INCLUDEDIR is used. +include(GNUInstallDirs) + +add_library(crc32c "" + # TODO(pwnall): Move the TARGET_OBJECTS generator expressions to the PRIVATE + # section of target_sources when cmake_minimum_required becomes 3.9 or above. + $<TARGET_OBJECTS:crc32c_arm64> + $<TARGET_OBJECTS:crc32c_sse42> +) +target_sources(crc32c + PRIVATE + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" + "src/crc32c_arm64.h" + "src/crc32c_arm64_linux_check.h" + "src/crc32c_internal.h" + "src/crc32c_portable.cc" + "src/crc32c_prefetch.h" + "src/crc32c_read_le.h" + "src/crc32c_round_up.h" + "src/crc32c_sse42.h" + "src/crc32c_sse42_check.h" + "src/crc32c.cc" + + # Only CMake 3.3+ supports PUBLIC sources in targets exported by "install". + $<$<VERSION_GREATER:CMAKE_VERSION,3.2>:PUBLIC> + "include/crc32c/crc32c.h" +) + +target_include_directories(crc32c + PUBLIC + $<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}/include> + $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}> +) + +target_compile_definitions(crc32c +PRIVATE + CRC32C_HAVE_CONFIG_H=1 +) + +set_target_properties(crc32c + PROPERTIES VERSION ${PROJECT_VERSION} SOVERSION ${PROJECT_VERSION_MAJOR}) + +# Warnings as errors in Visual Studio for this project's targets. +if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set_property(TARGET crc32c APPEND PROPERTY COMPILE_OPTIONS "/WX") + set_property(TARGET crc32c_arm64 APPEND PROPERTY COMPILE_OPTIONS "/WX") + set_property(TARGET crc32c_sse42 APPEND PROPERTY COMPILE_OPTIONS "/WX") +endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + +if(CRC32C_BUILD_TESTS) + enable_testing() + + # Prevent overriding the parent project's compiler/linker settings on Windows. + set(gtest_force_shared_crt ON CACHE BOOL "" FORCE) + set(install_gtest OFF) + set(install_gmock OFF) + + # This project is tested using GoogleTest. + add_subdirectory("third_party/googletest") + + # GoogleTest triggers a missing field initializers warning. + if(CRC32C_HAVE_NO_MISSING_FIELD_INITIALIZERS) + set_property(TARGET gtest + APPEND PROPERTY COMPILE_OPTIONS -Wno-missing-field-initializers) + set_property(TARGET gmock + APPEND PROPERTY COMPILE_OPTIONS -Wno-missing-field-initializers) + endif(CRC32C_HAVE_NO_MISSING_FIELD_INITIALIZERS) + + add_executable(crc32c_tests "") + target_sources(crc32c_tests + PRIVATE + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" + "src/crc32c_arm64_unittest.cc" + "src/crc32c_extend_unittests.h" + "src/crc32c_portable_unittest.cc" + "src/crc32c_prefetch_unittest.cc" + "src/crc32c_read_le_unittest.cc" + "src/crc32c_round_up_unittest.cc" + "src/crc32c_sse42_unittest.cc" + "src/crc32c_unittest.cc" + "src/crc32c_test_main.cc" + ) + target_link_libraries(crc32c_tests crc32c gtest) + + # Warnings as errors in Visual Studio for this project's targets. + if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set_property(TARGET crc32c_tests APPEND PROPERTY COMPILE_OPTIONS "/WX") + endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + + if(CRC32C_USE_GLOG) + target_link_libraries(crc32c_tests glog) + endif(CRC32C_USE_GLOG) + + add_test(NAME crc32c_tests COMMAND crc32c_tests) + + add_executable(crc32c_capi_tests "") + target_sources(crc32c_capi_tests + PRIVATE + "src/crc32c_capi_unittest.c" + ) + target_link_libraries(crc32c_capi_tests crc32c) + + # Warnings as errors in Visual Studio for this project's targets. + if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set_property(TARGET crc32c_capi_tests APPEND PROPERTY COMPILE_OPTIONS "/WX") + endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + + add_test(NAME crc32c_capi_tests COMMAND crc32c_capi_tests) +endif(CRC32C_BUILD_TESTS) + +if(CRC32C_BUILD_BENCHMARKS) + add_executable(crc32c_bench "") + target_sources(crc32c_bench + PRIVATE + "${PROJECT_BINARY_DIR}/include/crc32c/crc32c_config.h" + "src/crc32c_benchmark.cc" + ) + target_link_libraries(crc32c_bench crc32c) + + # This project uses Google benchmark for benchmarking. + set(BENCHMARK_ENABLE_TESTING OFF CACHE BOOL "" FORCE) + set(BENCHMARK_ENABLE_EXCEPTIONS OFF CACHE BOOL "" FORCE) + add_subdirectory("third_party/benchmark") + target_link_libraries(crc32c_bench benchmark) + + if(CRC32C_USE_GLOG) + target_link_libraries(crc32c_bench glog) + endif(CRC32C_USE_GLOG) + + # Warnings as errors in Visual Studio for this project's targets. + if(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") + set_property(TARGET crc32c_bench APPEND PROPERTY COMPILE_OPTIONS "/WX") + endif(CMAKE_CXX_COMPILER_ID STREQUAL "MSVC") +endif(CRC32C_BUILD_BENCHMARKS) + +if(CRC32C_INSTALL) + install(TARGETS crc32c + EXPORT Crc32cTargets + RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR} + LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} + ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} + ) + install( + FILES + "include/crc32c/crc32c.h" + DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}/crc32c" + ) + + include(CMakePackageConfigHelpers) + write_basic_package_version_file( + "${PROJECT_BINARY_DIR}/Crc32cConfigVersion.cmake" + COMPATIBILITY SameMajorVersion + ) + install( + EXPORT Crc32cTargets + NAMESPACE Crc32c:: + DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Crc32c" + ) + install( + FILES + "Crc32cConfig.cmake" + "${PROJECT_BINARY_DIR}/Crc32cConfigVersion.cmake" + DESTINATION "${CMAKE_INSTALL_LIBDIR}/cmake/Crc32c" + ) +endif(CRC32C_INSTALL) diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md new file mode 100644 index 0000000000..ae319c70ac --- /dev/null +++ b/CONTRIBUTING.md @@ -0,0 +1,23 @@ +# How to Contribute + +We'd love to accept your patches and contributions to this project. There are +just a few small guidelines you need to follow. + +## Contributor License Agreement + +Contributions to this project must be accompanied by a Contributor License +Agreement. You (or your employer) retain the copyright to your contribution, +this simply gives us permission to use and redistribute your contributions as +part of the project. Head over to <https://cla.developers.google.com/> to see +your current agreements on file or to sign a new one. + +You generally only need to submit a CLA once, so if you've already submitted one +(even if it was for a different project), you probably don't need to do it +again. + +## Code reviews + +All submissions, including submissions by project members, require review. We +use GitHub pull requests for this purpose. Consult +[GitHub Help](https://help.github.com/articles/about-pull-requests/) for more +information on using pull requests. diff --git a/Crc32cConfig.cmake b/Crc32cConfig.cmake new file mode 100644 index 0000000000..4d6057ec26 --- /dev/null +++ b/Crc32cConfig.cmake @@ -0,0 +1,5 @@ +# Copyright 2017 The CRC32C Authors. All rights reserved. +# Use of this source code is governed by a BSD-style license that can be +# found in the LICENSE file. See the AUTHORS file for names of contributors. + +include("${CMAKE_CURRENT_LIST_DIR}/Crc32cTargets.cmake") diff --git a/LICENSE b/LICENSE new file mode 100644 index 0000000000..8c8735cf12 --- /dev/null +++ b/LICENSE @@ -0,0 +1,28 @@ +Copyright 2017, The CRC32C Authors. + +Redistribution and use in source and binary forms, with or without +modification, are permitted provided that the following conditions are +met: + + * Redistributions of source code must retain the above copyright +notice, this list of conditions and the following disclaimer. + * Redistributions in binary form must reproduce the above +copyright notice, this list of conditions and the following disclaimer +in the documentation and/or other materials provided with the +distribution. + + * Neither the name of Google Inc. nor the names of its +contributors may be used to endorse or promote products derived from +this software without specific prior written permission. + +THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS +"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT +LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR +A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT +OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT +LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE +OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. diff --git a/README.md b/README.md new file mode 100644 index 0000000000..0bd69f7f09 --- /dev/null +++ b/README.md @@ -0,0 +1,125 @@ +# CRC32C + +[](https://travis-ci.org/google/crc32c) +[](https://ci.appveyor.com/project/pwnall/crc32c) + +New file format authors should consider +[HighwayHash](https://github.com/google/highwayhash). The initial version of +this code was extracted from [LevelDB](https://github.com/google/leveldb), which +is a stable key-value store that is widely used at Google. + +This project collects a few CRC32C implementations under an umbrella that +dispatches to a suitable implementation based on the host computer's hardware +capabilities. + +CRC32C is specified as the CRC that uses the iSCSI polynomial in +[RFC 3720](https://tools.ietf.org/html/rfc3720#section-12.1). The polynomial was +introduced by G. Castagnoli, S. Braeuer and M. Herrmann. CRC32C is used in +software such as Btrfs, ext4, Ceph and leveldb. + + +## Usage + +```cpp +#include "crc32c/crc32c.h" + +int main() { + const std::uint8_t buffer[] = {0, 0, 0, 0}; + std::uint32_t result; + + // Process a raw buffer. + result = crc32c::Crc32c(buffer, 4); + + // Process a std::string. + std::string string; + string.resize(4); + result = crc32c::Crc32c(string); + + // If you have C++17 support, process a std::string_view. + std::string_view string_view(string); + result = crc32c::Crc32c(string_view); + + return 0; +} +``` + + +## Prerequisites + +This project uses [CMake](https://cmake.org/) for building and testing. CMake is +available in all popular Linux distributions, as well as in +[Homebrew](https://brew.sh/). + +This project uses submodules for dependency management. + +```bash +git submodule update --init --recursive +``` + +If you're using [Atom](https://atom.io/), the following packages can help. + +```bash +apm install autocomplete-clang build build-cmake clang-format language-cmake \ + linter linter-clang +``` + +If you don't mind more setup in return for more speed, replace +`autocomplete-clang` and `linter-clang` with `you-complete-me`. This requires +[setting up ycmd](https://github.com/Valloric/ycmd#building). + +```bash +apm install autocomplete-plus build build-cmake clang-format language-cmake \ + linter you-complete-me +``` + +## Building + +The following commands build and install the project. + +```bash +mkdir build +cd build +cmake -DCRC32C_BUILD_TESTS=0 -DCRC32C_BUILD_BENCHMARKS=0 .. && make all install +``` + + +## Development + +The following command (when executed from `build/`) (re)builds the project and +runs the tests. + +```bash +cmake .. && cmake --build . && ctest --output-on-failure +``` + + +### Android testing + +The following command builds the project against the Android NDK, which is +useful for benchmarking against ARM processors. + +```bash +cmake .. -DCMAKE_SYSTEM_NAME=Android -DCMAKE_ANDROID_ARCH_ABI=arm64-v8a \ + -DCMAKE_ANDROID_NDK=$HOME/Library/Android/sdk/ndk-bundle \ + -DCMAKE_ANDROID_NDK_TOOLCHAIN_VERSION=clang \ + -DCMAKE_ANDROID_STL_TYPE=c++_static -DCRC32C_USE_GLOG=0 \ + -DCMAKE_BUILD_TYPE=Release && cmake --build . +``` + +The following commands install and run the benchmarks. + +```bash +adb push crc32c_bench /data/local/tmp +adb shell chmod +x /data/local/tmp/crc32c_bench +adb shell 'cd /data/local/tmp && ./crc32c_bench' +adb shell rm /data/local/tmp/crc32c_bench +``` + +The following commands install and run the tests. + +```bash +adb push crc32c_tests /data/local/tmp +adb shell chmod +x /data/local/tmp/crc32c_tests +adb shell 'cd /data/local/tmp && ./crc32c_tests' +adb shell rm /data/local/tmp/crc32c_tests +``` diff --git a/include/crc32c/crc32c.h b/include/crc32c/crc32c.h new file mode 100644 index 0000000000..e8a78170a9 --- /dev/null +++ b/include/crc32c/crc32c.h @@ -0,0 +1,89 @@ +/* Copyright 2017 The CRC32C Authors. All rights reserved. + Use of this source code is governed by a BSD-style license that can be + found in the LICENSE file. See the AUTHORS file for names of contributors. */ + +#ifndef CRC32C_CRC32C_H_ +#define CRC32C_CRC32C_H_ + +/* The API exported by the CRC32C project. */ + +#if defined(__cplusplus) + +#include <cstddef> +#include <cstdint> +#include <string> + +#else /* !defined(__cplusplus) */ + +#include <stddef.h> +#include <stdint.h> + +#endif /* !defined(__cplusplus) */ + + +/* The C API. */ + +#if defined(__cplusplus) +extern "C" { +#endif /* defined(__cplusplus) */ + +/* Extends "crc" with the CRC32C of "count" bytes in the buffer pointed by + "data" */ +uint32_t crc32c_extend(uint32_t crc, const uint8_t* data, size_t count); + +/* Computes the CRC32C of "count" bytes in the buffer pointed by "data". */ +uint32_t crc32c_value(const uint8_t* data, size_t count); + +#ifdef __cplusplus +} /* end extern "C" */ +#endif /* defined(__cplusplus) */ + + +/* The C++ API. */ + +#if defined(__cplusplus) + +namespace crc32c { + +// Extends "crc" with the CRC32C of "count" bytes in the buffer pointed by +// "data". +uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count); + +// Computes the CRC32C of "count" bytes in the buffer pointed by "data". +inline uint32_t Crc32c(const uint8_t* data, size_t count) { + return Extend(0, data, count); +} + +// Computes the CRC32C of "count" bytes in the buffer pointed by "data". +inline uint32_t Crc32c(const char* data, size_t count) { + return Extend(0, reinterpret_cast<const uint8_t*>(data), count); +} + +// Computes the CRC32C of the string's content. +inline uint32_t Crc32c(const std::string& string) { + return Crc32c(reinterpret_cast<const uint8_t*>(string.data()), + string.size()); +} + +} // namespace crc32c + +#if __cplusplus > 201402L +#if __has_include(<string_view>) +#include <string_view> + +namespace crc32c { + +// Computes the CRC32C of the bytes in the string_view. +inline uint32_t Crc32c(const std::string_view& string_view) { + return Crc32c(reinterpret_cast<const uint8_t*>(string_view.data()), + string_view.size()); +} + +} // namespace crc32c + +#endif // __has_include(<string_view>) +#endif // __cplusplus > 201402L + +#endif /* defined(__cplusplus) */ + +#endif // CRC32C_CRC32C_H_ diff --git a/src/crc32c.cc b/src/crc32c.cc new file mode 100644 index 0000000000..4d3018af47 --- /dev/null +++ b/src/crc32c.cc @@ -0,0 +1,39 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "crc32c/crc32c.h" + +#include <cstddef> +#include <cstdint> + +#include "./crc32c_arm64.h" +#include "./crc32c_arm64_linux_check.h" +#include "./crc32c_internal.h" +#include "./crc32c_sse42.h" +#include "./crc32c_sse42_check.h" + +namespace crc32c { + +uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count) { +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + static bool can_use_sse42 = CanUseSse42(); + if (can_use_sse42) return ExtendSse42(crc, data, count); +#elif HAVE_ARM64_CRC32C + static bool can_use_arm_linux = CanUseArm64Linux(); + if (can_use_arm_linux) return ExtendArm64(crc, data, count); +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + + return ExtendPortable(crc, data, count); +} + +extern "C" uint32_t crc32c_extend(uint32_t crc, const uint8_t* data, + size_t count) { + return crc32c::Extend(crc, data, count); +} + +extern "C" uint32_t crc32c_value(const uint8_t* data, size_t count) { + return crc32c::Crc32c(data, count); +} + +} // namespace crc32c diff --git a/src/crc32c_arm64.cc b/src/crc32c_arm64.cc new file mode 100644 index 0000000000..b872245f95 --- /dev/null +++ b/src/crc32c_arm64.cc @@ -0,0 +1,126 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_arm64.h" + +// In a separate source file to allow this accelerated CRC32C function to be +// compiled with the appropriate compiler flags to enable ARM NEON CRC32C +// instructions. + +// This implementation is based on https://github.com/google/leveldb/pull/490. + +#include <cstddef> +#include <cstdint> + +#include "./crc32c_internal.h" +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_ARM64_CRC32C + +#include <arm_acle.h> +#include <arm_neon.h> + +#define KBYTES 1032 +#define SEGMENTBYTES 256 + +// compute 8bytes for each segment parallelly +#define CRC32C32BYTES(P, IND) \ + do { \ + crc1 = __crc32cd( \ + crc1, *((const uint64_t *)(P) + (SEGMENTBYTES / 8) * 1 + (IND))); \ + crc2 = __crc32cd( \ + crc2, *((const uint64_t *)(P) + (SEGMENTBYTES / 8) * 2 + (IND))); \ + crc3 = __crc32cd( \ + crc3, *((const uint64_t *)(P) + (SEGMENTBYTES / 8) * 3 + (IND))); \ + crc0 = __crc32cd( \ + crc0, *((const uint64_t *)(P) + (SEGMENTBYTES / 8) * 0 + (IND))); \ + } while (0); + +// compute 8*8 bytes for each segment parallelly +#define CRC32C256BYTES(P, IND) \ + do { \ + CRC32C32BYTES((P), (IND)*8 + 0) \ + CRC32C32BYTES((P), (IND)*8 + 1) \ + CRC32C32BYTES((P), (IND)*8 + 2) \ + CRC32C32BYTES((P), (IND)*8 + 3) \ + CRC32C32BYTES((P), (IND)*8 + 4) \ + CRC32C32BYTES((P), (IND)*8 + 5) \ + CRC32C32BYTES((P), (IND)*8 + 6) \ + CRC32C32BYTES((P), (IND)*8 + 7) \ + } while (0); + +// compute 4*8*8 bytes for each segment parallelly +#define CRC32C1024BYTES(P) \ + do { \ + CRC32C256BYTES((P), 0) \ + CRC32C256BYTES((P), 1) \ + CRC32C256BYTES((P), 2) \ + CRC32C256BYTES((P), 3) \ + (P) += 4 * SEGMENTBYTES; \ + } while (0) + +namespace crc32c { + +uint32_t ExtendArm64(uint32_t crc, const uint8_t *buf, size_t size) { + int64_t length = size; + uint32_t crc0, crc1, crc2, crc3; + uint64_t t0, t1, t2; + + // k0=CRC(x^(3*SEGMENTBYTES*8)), k1=CRC(x^(2*SEGMENTBYTES*8)), + // k2=CRC(x^(SEGMENTBYTES*8)) + const poly64_t k0 = 0x8d96551c, k1 = 0xbd6f81f8, k2 = 0xdcb17aa4; + + crc = crc ^ kCRC32Xor; + const uint8_t *p = reinterpret_cast<const uint8_t *>(buf); + + while (length >= KBYTES) { + crc0 = crc; + crc1 = 0; + crc2 = 0; + crc3 = 0; + + // Process 1024 bytes in parallel. + CRC32C1024BYTES(p); + + // Merge the 4 partial CRC32C values. + t2 = (uint64_t)vmull_p64(crc2, k2); + t1 = (uint64_t)vmull_p64(crc1, k1); + t0 = (uint64_t)vmull_p64(crc0, k0); + crc = __crc32cd(crc3, *(uint64_t *)p); + p += sizeof(uint64_t); + crc ^= __crc32cd(0, t2); + crc ^= __crc32cd(0, t1); + crc ^= __crc32cd(0, t0); + + length -= KBYTES; + } + + while (length >= 8) { + crc = __crc32cd(crc, *(uint64_t *)p); + p += 8; + length -= 8; + } + + if (length & 4) { + crc = __crc32cw(crc, *(uint32_t *)p); + p += 4; + } + + if (length & 2) { + crc = __crc32ch(crc, *(uint16_t *)p); + p += 2; + } + + if (length & 1) { + crc = __crc32cb(crc, *p); + } + + return crc ^ kCRC32Xor; +} + +} // namespace crc32c + +#endif // HAVE_ARM64_CRC32C diff --git a/src/crc32c_arm64.h b/src/crc32c_arm64.h new file mode 100644 index 0000000000..100cd56ec8 --- /dev/null +++ b/src/crc32c_arm64.h @@ -0,0 +1,27 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +// Linux-specific code checking the availability for ARM CRC32C instructions. + +#ifndef CRC32C_CRC32C_ARM_LINUX_H_ +#define CRC32C_CRC32C_ARM_LINUX_H_ + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_ARM64_CRC32C + +namespace crc32c { + +uint32_t ExtendArm64(uint32_t crc, const uint8_t* data, size_t count); + +} // namespace crc32c + +#endif // HAVE_ARM64_CRC32C + +#endif // CRC32C_CRC32C_ARM_LINUX_H_ diff --git a/src/crc32c_arm64_linux_check.h b/src/crc32c_arm64_linux_check.h new file mode 100644 index 0000000000..1a20a757bb --- /dev/null +++ b/src/crc32c_arm64_linux_check.h @@ -0,0 +1,50 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +// ARM Linux-specific code checking for the availability of CRC32C instructions. + +#ifndef CRC32C_CRC32C_ARM_LINUX_CHECK_H_ +#define CRC32C_CRC32C_ARM_LINUX_CHECK_H_ + +// X86-specific code checking for the availability of SSE4.2 instructions. + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_ARM64_CRC32C + +#if HAVE_STRONG_GETAUXVAL +#include <sys/auxv.h> +#elif HAVE_WEAK_GETAUXVAL +// getauxval() is not available on Android until API level 20. Link it as a weak +// symbol. +extern "C" unsigned long getauxval(unsigned long type) __attribute__((weak)); + +#define AT_HWCAP 16 +#endif // HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL + +namespace crc32c { + +inline bool CanUseArm64Linux() { +#if HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL + // From 'arch/arm64/include/uapi/asm/hwcap.h' in Linux kernel source code. + constexpr unsigned long kHWCAP_PMULL = 1 << 4; + constexpr unsigned long kHWCAP_CRC32 = 1 << 7; + unsigned long hwcap = (&getauxval != nullptr) ? getauxval(AT_HWCAP) : 0; + return (hwcap & (kHWCAP_PMULL | kHWCAP_CRC32)) == + (kHWCAP_PMULL | kHWCAP_CRC32); +#else + return false; +#endif // HAVE_STRONG_GETAUXVAL || HAVE_WEAK_GETAUXVAL +} + +} // namespace crc32c + +#endif // HAVE_ARM64_CRC32C + +#endif // CRC32C_CRC32C_ARM_LINUX_CHECK_H_ diff --git a/src/crc32c_arm64_unittest.cc b/src/crc32c_arm64_unittest.cc new file mode 100644 index 0000000000..6f917d9c0c --- /dev/null +++ b/src/crc32c_arm64_unittest.cc @@ -0,0 +1,24 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "gtest/gtest.h" + +#include "./crc32c_arm64.h" +#include "./crc32c_extend_unittests.h" + +namespace crc32c { + +#if HAVE_ARM64_CRC32C + +struct Arm64TestTraits { + static uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count) { + return ExtendArm64(crc, data, count); + } +}; + +INSTANTIATE_TYPED_TEST_SUITE_P(Arm64, ExtendTest, Arm64TestTraits); + +#endif // HAVE_ARM64_CRC32C + +} // namespace crc32c diff --git a/src/crc32c_benchmark.cc b/src/crc32c_benchmark.cc new file mode 100644 index 0000000000..c464304b3f --- /dev/null +++ b/src/crc32c_benchmark.cc @@ -0,0 +1,106 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#include "benchmark/benchmark.h" + +#if CRC32C_TESTS_BUILT_WITH_GLOG +#include "glog/logging.h" +#endif // CRC32C_TESTS_BUILT_WITH_GLOG + +#include "./crc32c_arm64.h" +#include "./crc32c_arm64_linux_check.h" +#include "./crc32c_internal.h" +#include "./crc32c_sse42.h" +#include "./crc32c_sse42_check.h" +#include "crc32c/crc32c.h" + +class CRC32CBenchmark : public benchmark::Fixture { + public: + void SetUp(const benchmark::State& state) override { + block_size_ = static_cast<size_t>(state.range(0)); + block_data_ = std::string(block_size_, 'x'); + block_buffer_ = reinterpret_cast<const uint8_t*>(block_data_.data()); + } + + protected: + std::string block_data_; + const uint8_t* block_buffer_; + size_t block_size_; +}; + +BENCHMARK_DEFINE_F(CRC32CBenchmark, Public)(benchmark::State& state) { + uint32_t crc = 0; + for (auto _ : state) + crc = crc32c::Extend(crc, block_buffer_, block_size_); + state.SetBytesProcessed(state.iterations() * block_size_); +} +BENCHMARK_REGISTER_F(CRC32CBenchmark, Public) + ->RangeMultiplier(16) + ->Range(256, 16777216); // Block size. + +BENCHMARK_DEFINE_F(CRC32CBenchmark, Portable)(benchmark::State& state) { + uint32_t crc = 0; + for (auto _ : state) + crc = crc32c::ExtendPortable(crc, block_buffer_, block_size_); + state.SetBytesProcessed(state.iterations() * block_size_); +} +BENCHMARK_REGISTER_F(CRC32CBenchmark, Portable) + ->RangeMultiplier(16) + ->Range(256, 16777216); // Block size. + +#if HAVE_ARM64_CRC32C + +BENCHMARK_DEFINE_F(CRC32CBenchmark, ArmLinux)(benchmark::State& state) { + if (!crc32c::CanUseArm64Linux()) { + state.SkipWithError("ARM CRC32C instructions not available or not enabled"); + return; + } + + uint32_t crc = 0; + for (auto _ : state) + crc = crc32c::ExtendArm64(crc, block_buffer_, block_size_); + state.SetBytesProcessed(state.iterations() * block_size_); +} +BENCHMARK_REGISTER_F(CRC32CBenchmark, ArmLinux) + ->RangeMultiplier(16) + ->Range(256, 16777216); // Block size. + +#endif // HAVE_ARM64_CRC32C + +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +BENCHMARK_DEFINE_F(CRC32CBenchmark, Sse42)(benchmark::State& state) { + if (!crc32c::CanUseSse42()) { + state.SkipWithError("SSE4.2 instructions not available or not enabled"); + return; + } + + uint32_t crc = 0; + for (auto _ : state) + crc = crc32c::ExtendSse42(crc, block_buffer_, block_size_); + state.SetBytesProcessed(state.iterations() * block_size_); +} +BENCHMARK_REGISTER_F(CRC32CBenchmark, Sse42) + ->RangeMultiplier(16) + ->Range(256, 16777216); // Block size. + +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +int main(int argc, char** argv) { +#if CRC32C_TESTS_BUILT_WITH_GLOG + google::InitGoogleLogging(argv[0]); + google::InstallFailureSignalHandler(); +#endif // CRC32C_TESTS_BUILT_WITH_GLOG + + benchmark::Initialize(&argc, argv); + benchmark::RunSpecifiedBenchmarks(); + return 0; +} diff --git a/src/crc32c_capi_unittest.c b/src/crc32c_capi_unittest.c new file mode 100644 index 0000000000..c8993a0959 --- /dev/null +++ b/src/crc32c_capi_unittest.c @@ -0,0 +1,66 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "crc32c/crc32c.h" + +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +int main() { + /* From rfc3720 section B.4. */ + uint8_t buf[32]; + + memset(buf, 0, sizeof(buf)); + if ((uint32_t)0x8a9136aa != crc32c_value(buf, sizeof(buf))) { + printf("crc32c_value(zeros) test failed\n"); + return 1; + } + + memset(buf, 0xff, sizeof(buf)); + if ((uint32_t)0x62a8ab43 != crc32c_value(buf, sizeof(buf))) { + printf("crc32c_value(0xff) test failed\n"); + return 1; + } + + for (size_t i = 0; i < 32; ++i) + buf[i] = (uint8_t)i; + if ((uint32_t)0x46dd794e != crc32c_value(buf, sizeof(buf))) { + printf("crc32c_value(0..31) test failed\n"); + return 1; + } + + for (size_t i = 0; i < 32; ++i) + buf[i] = (uint8_t)(31 - i); + if ((uint32_t)0x113fdb5c != crc32c_value(buf, sizeof(buf))) { + printf("crc32c_value(31..0) test failed\n"); + return 1; + } + + uint8_t data[48] = { + 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + if ((uint32_t)0xd9963a56 != crc32c_value(data, sizeof(data))) { + printf("crc32c_value(31..0) test failed\n"); + return 1; + } + + const uint8_t* hello_space_world = (const uint8_t*)"hello world"; + const uint8_t* hello_space = (const uint8_t*)"hello "; + const uint8_t* world = (const uint8_t*)"world"; + + if (crc32c_value(hello_space_world, 11) != + crc32c_extend(crc32c_value(hello_space, 6), world, 5)) { + printf("crc32c_extend test failed\n"); + return 1; + } + + printf("All tests passed\n"); + return 0; +} diff --git a/src/crc32c_config.h.in b/src/crc32c_config.h.in new file mode 100644 index 0000000000..4034fa5644 --- /dev/null +++ b/src/crc32c_config.h.in @@ -0,0 +1,36 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_CONFIG_H_ +#define CRC32C_CRC32C_CONFIG_H_ + +// Define to 1 if building for a big-endian platform. +#cmakedefine01 BYTE_ORDER_BIG_ENDIAN + +// Define to 1 if the compiler has the __builtin_prefetch intrinsic. +#cmakedefine01 HAVE_BUILTIN_PREFETCH + +// Define to 1 if targeting X86 and the compiler has the _mm_prefetch intrinsic. +#cmakedefine01 HAVE_MM_PREFETCH + +// Define to 1 if targeting X86 and the compiler has the _mm_crc32_u{8,32,64} +// intrinsics. +#cmakedefine01 HAVE_SSE42 + +// Define to 1 if targeting ARM and the compiler has the __crc32c{b,h,w,d} and +// the vmull_p64 intrinsics. +#cmakedefine01 HAVE_ARM64_CRC32C + +// Define to 1 if the system libraries have the getauxval function in the +// <sys/auxv.h> header. Should be true on Linux and Android API level 20+. +#cmakedefine01 HAVE_STRONG_GETAUXVAL + +// Define to 1 if the compiler supports defining getauxval as a weak symbol. +// Should be true for any compiler that supports __attribute__((weak)). +#cmakedefine01 HAVE_WEAK_GETAUXVAL + +// Define to 1 if CRC32C tests have been built with Google Logging. +#cmakedefine01 CRC32C_TESTS_BUILT_WITH_GLOG + +#endif // CRC32C_CRC32C_CONFIG_H_ diff --git a/src/crc32c_extend_unittests.h b/src/crc32c_extend_unittests.h new file mode 100644 index 0000000000..0732973737 --- /dev/null +++ b/src/crc32c_extend_unittests.h @@ -0,0 +1,112 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_EXTEND_UNITTESTS_H_ +#define CRC32C_CRC32C_EXTEND_UNITTESTS_H_ + +#include <cstddef> +#include <cstdint> +#include <cstring> + +#include "gtest/gtest.h" + +// Common test cases for all implementations of CRC32C_Extend(). + +namespace crc32c { + +template<typename TestTraits> +class ExtendTest : public testing::Test {}; + +TYPED_TEST_SUITE_P(ExtendTest); + +TYPED_TEST_P(ExtendTest, StandardResults) { + // From rfc3720 section B.4. + uint8_t buf[32]; + + std::memset(buf, 0, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa), + TypeParam::Extend(0, buf, sizeof(buf))); + + std::memset(buf, 0xff, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43), + TypeParam::Extend(0, buf, sizeof(buf))); + + for (int i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(i); + EXPECT_EQ(static_cast<uint32_t>(0x46dd794e), + TypeParam::Extend(0, buf, sizeof(buf))); + + for (int i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(31 - i); + EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c), + TypeParam::Extend(0, buf, sizeof(buf))); + + uint8_t data[48] = { + 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + EXPECT_EQ(static_cast<uint32_t>(0xd9963a56), + TypeParam::Extend(0, data, sizeof(data))); +} + +TYPED_TEST_P(ExtendTest, HelloWorld) { + const uint8_t* hello_space_world = + reinterpret_cast<const uint8_t*>("hello world"); + const uint8_t* hello_space = reinterpret_cast<const uint8_t*>("hello "); + const uint8_t* world = reinterpret_cast<const uint8_t*>("world"); + + EXPECT_EQ(TypeParam::Extend(0, hello_space_world, 11), + TypeParam::Extend(TypeParam::Extend(0, hello_space, 6), world, 5)); +} + +TYPED_TEST_P(ExtendTest, BufferSlicing) { + uint8_t buffer[48] = { + 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + + for (size_t i = 0; i < 48; ++i) { + for (size_t j = i + 1; j <= 48; ++j) { + uint32_t crc = 0; + + if (i > 0) crc = TypeParam::Extend(crc, buffer, i); + crc = TypeParam::Extend(crc, buffer + i, j - i); + if (j < 48) crc = TypeParam::Extend(crc, buffer + j, 48 - j); + + EXPECT_EQ(static_cast<uint32_t>(0xd9963a56), crc); + } + } +} + +TYPED_TEST_P(ExtendTest, LargeBufferSlicing) { + uint8_t buffer[2048]; + for (size_t i = 0; i < 2048; i++) + buffer[i] = static_cast<uint8_t>(3 * i * i + 7 * i + 11); + + for (size_t i = 0; i < 2048; ++i) { + for (size_t j = i + 1; j <= 2048; ++j) { + uint32_t crc = 0; + + if (i > 0) crc = TypeParam::Extend(crc, buffer, i); + crc = TypeParam::Extend(crc, buffer + i, j - i); + if (j < 2048) crc = TypeParam::Extend(crc, buffer + j, 2048 - j); + + EXPECT_EQ(static_cast<uint32_t>(0x36dcc753), crc); + } + } +} + +REGISTER_TYPED_TEST_SUITE_P(ExtendTest, + StandardResults, + HelloWorld, + BufferSlicing, + LargeBufferSlicing); + +} // namespace crc32c + +#endif // CRC32C_CRC32C_EXTEND_UNITTESTS_H_ diff --git a/src/crc32c_internal.h b/src/crc32c_internal.h new file mode 100644 index 0000000000..2bd23dea43 --- /dev/null +++ b/src/crc32c_internal.h @@ -0,0 +1,23 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_INTERNAL_H_ +#define CRC32C_CRC32C_INTERNAL_H_ + +// Internal functions that may change between releases. + +#include <cstddef> +#include <cstdint> + +namespace crc32c { + +// Un-accelerated implementation that works on all CPUs. +uint32_t ExtendPortable(uint32_t crc, const uint8_t* data, size_t count); + +// CRCs are pre- and post- conditioned by xoring with all ones. +static constexpr const uint32_t kCRC32Xor = static_cast<uint32_t>(0xffffffffU); + +} // namespace crc32c + +#endif // CRC32C_CRC32C_INTERNAL_H_ diff --git a/src/crc32c_portable.cc b/src/crc32c_portable.cc new file mode 100644 index 0000000000..31ec6eac53 --- /dev/null +++ b/src/crc32c_portable.cc @@ -0,0 +1,351 @@ +// Copyright 2008 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_internal.h" + +#include <cstddef> +#include <cstdint> + +#include "./crc32c_prefetch.h" +#include "./crc32c_read_le.h" +#include "./crc32c_round_up.h" + +namespace { + +const uint32_t kByteExtensionTable[256] = { + 0x00000000, 0xf26b8303, 0xe13b70f7, 0x1350f3f4, 0xc79a971f, 0x35f1141c, + 0x26a1e7e8, 0xd4ca64eb, 0x8ad958cf, 0x78b2dbcc, 0x6be22838, 0x9989ab3b, + 0x4d43cfd0, 0xbf284cd3, 0xac78bf27, 0x5e133c24, 0x105ec76f, 0xe235446c, + 0xf165b798, 0x030e349b, 0xd7c45070, 0x25afd373, 0x36ff2087, 0xc494a384, + 0x9a879fa0, 0x68ec1ca3, 0x7bbcef57, 0x89d76c54, 0x5d1d08bf, 0xaf768bbc, + 0xbc267848, 0x4e4dfb4b, 0x20bd8ede, 0xd2d60ddd, 0xc186fe29, 0x33ed7d2a, + 0xe72719c1, 0x154c9ac2, 0x061c6936, 0xf477ea35, 0xaa64d611, 0x580f5512, + 0x4b5fa6e6, 0xb93425e5, 0x6dfe410e, 0x9f95c20d, 0x8cc531f9, 0x7eaeb2fa, + 0x30e349b1, 0xc288cab2, 0xd1d83946, 0x23b3ba45, 0xf779deae, 0x05125dad, + 0x1642ae59, 0xe4292d5a, 0xba3a117e, 0x4851927d, 0x5b016189, 0xa96ae28a, + 0x7da08661, 0x8fcb0562, 0x9c9bf696, 0x6ef07595, 0x417b1dbc, 0xb3109ebf, + 0xa0406d4b, 0x522bee48, 0x86e18aa3, 0x748a09a0, 0x67dafa54, 0x95b17957, + 0xcba24573, 0x39c9c670, 0x2a993584, 0xd8f2b687, 0x0c38d26c, 0xfe53516f, + 0xed03a29b, 0x1f682198, 0x5125dad3, 0xa34e59d0, 0xb01eaa24, 0x42752927, + 0x96bf4dcc, 0x64d4cecf, 0x77843d3b, 0x85efbe38, 0xdbfc821c, 0x2997011f, + 0x3ac7f2eb, 0xc8ac71e8, 0x1c661503, 0xee0d9600, 0xfd5d65f4, 0x0f36e6f7, + 0x61c69362, 0x93ad1061, 0x80fde395, 0x72966096, 0xa65c047d, 0x5437877e, + 0x4767748a, 0xb50cf789, 0xeb1fcbad, 0x197448ae, 0x0a24bb5a, 0xf84f3859, + 0x2c855cb2, 0xdeeedfb1, 0xcdbe2c45, 0x3fd5af46, 0x7198540d, 0x83f3d70e, + 0x90a324fa, 0x62c8a7f9, 0xb602c312, 0x44694011, 0x5739b3e5, 0xa55230e6, + 0xfb410cc2, 0x092a8fc1, 0x1a7a7c35, 0xe811ff36, 0x3cdb9bdd, 0xceb018de, + 0xdde0eb2a, 0x2f8b6829, 0x82f63b78, 0x709db87b, 0x63cd4b8f, 0x91a6c88c, + 0x456cac67, 0xb7072f64, 0xa457dc90, 0x563c5f93, 0x082f63b7, 0xfa44e0b4, + 0xe9141340, 0x1b7f9043, 0xcfb5f4a8, 0x3dde77ab, 0x2e8e845f, 0xdce5075c, + 0x92a8fc17, 0x60c37f14, 0x73938ce0, 0x81f80fe3, 0x55326b08, 0xa759e80b, + 0xb4091bff, 0x466298fc, 0x1871a4d8, 0xea1a27db, 0xf94ad42f, 0x0b21572c, + 0xdfeb33c7, 0x2d80b0c4, 0x3ed04330, 0xccbbc033, 0xa24bb5a6, 0x502036a5, + 0x4370c551, 0xb11b4652, 0x65d122b9, 0x97baa1ba, 0x84ea524e, 0x7681d14d, + 0x2892ed69, 0xdaf96e6a, 0xc9a99d9e, 0x3bc21e9d, 0xef087a76, 0x1d63f975, + 0x0e330a81, 0xfc588982, 0xb21572c9, 0x407ef1ca, 0x532e023e, 0xa145813d, + 0x758fe5d6, 0x87e466d5, 0x94b49521, 0x66df1622, 0x38cc2a06, 0xcaa7a905, + 0xd9f75af1, 0x2b9cd9f2, 0xff56bd19, 0x0d3d3e1a, 0x1e6dcdee, 0xec064eed, + 0xc38d26c4, 0x31e6a5c7, 0x22b65633, 0xd0ddd530, 0x0417b1db, 0xf67c32d8, + 0xe52cc12c, 0x1747422f, 0x49547e0b, 0xbb3ffd08, 0xa86f0efc, 0x5a048dff, + 0x8ecee914, 0x7ca56a17, 0x6ff599e3, 0x9d9e1ae0, 0xd3d3e1ab, 0x21b862a8, + 0x32e8915c, 0xc083125f, 0x144976b4, 0xe622f5b7, 0xf5720643, 0x07198540, + 0x590ab964, 0xab613a67, 0xb831c993, 0x4a5a4a90, 0x9e902e7b, 0x6cfbad78, + 0x7fab5e8c, 0x8dc0dd8f, 0xe330a81a, 0x115b2b19, 0x020bd8ed, 0xf0605bee, + 0x24aa3f05, 0xd6c1bc06, 0xc5914ff2, 0x37faccf1, 0x69e9f0d5, 0x9b8273d6, + 0x88d28022, 0x7ab90321, 0xae7367ca, 0x5c18e4c9, 0x4f48173d, 0xbd23943e, + 0xf36e6f75, 0x0105ec76, 0x12551f82, 0xe03e9c81, 0x34f4f86a, 0xc69f7b69, + 0xd5cf889d, 0x27a40b9e, 0x79b737ba, 0x8bdcb4b9, 0x988c474d, 0x6ae7c44e, + 0xbe2da0a5, 0x4c4623a6, 0x5f16d052, 0xad7d5351}; + +const uint32_t kStrideExtensionTable0[256] = { + 0x00000000, 0x30d23865, 0x61a470ca, 0x517648af, 0xc348e194, 0xf39ad9f1, + 0xa2ec915e, 0x923ea93b, 0x837db5d9, 0xb3af8dbc, 0xe2d9c513, 0xd20bfd76, + 0x4035544d, 0x70e76c28, 0x21912487, 0x11431ce2, 0x03171d43, 0x33c52526, + 0x62b36d89, 0x526155ec, 0xc05ffcd7, 0xf08dc4b2, 0xa1fb8c1d, 0x9129b478, + 0x806aa89a, 0xb0b890ff, 0xe1ced850, 0xd11ce035, 0x4322490e, 0x73f0716b, + 0x228639c4, 0x125401a1, 0x062e3a86, 0x36fc02e3, 0x678a4a4c, 0x57587229, + 0xc566db12, 0xf5b4e377, 0xa4c2abd8, 0x941093bd, 0x85538f5f, 0xb581b73a, + 0xe4f7ff95, 0xd425c7f0, 0x461b6ecb, 0x76c956ae, 0x27bf1e01, 0x176d2664, + 0x053927c5, 0x35eb1fa0, 0x649d570f, 0x544f6f6a, 0xc671c651, 0xf6a3fe34, + 0xa7d5b69b, 0x97078efe, 0x8644921c, 0xb696aa79, 0xe7e0e2d6, 0xd732dab3, + 0x450c7388, 0x75de4bed, 0x24a80342, 0x147a3b27, 0x0c5c750c, 0x3c8e4d69, + 0x6df805c6, 0x5d2a3da3, 0xcf149498, 0xffc6acfd, 0xaeb0e452, 0x9e62dc37, + 0x8f21c0d5, 0xbff3f8b0, 0xee85b01f, 0xde57887a, 0x4c692141, 0x7cbb1924, + 0x2dcd518b, 0x1d1f69ee, 0x0f4b684f, 0x3f99502a, 0x6eef1885, 0x5e3d20e0, + 0xcc0389db, 0xfcd1b1be, 0xada7f911, 0x9d75c174, 0x8c36dd96, 0xbce4e5f3, + 0xed92ad5c, 0xdd409539, 0x4f7e3c02, 0x7fac0467, 0x2eda4cc8, 0x1e0874ad, + 0x0a724f8a, 0x3aa077ef, 0x6bd63f40, 0x5b040725, 0xc93aae1e, 0xf9e8967b, + 0xa89eded4, 0x984ce6b1, 0x890ffa53, 0xb9ddc236, 0xe8ab8a99, 0xd879b2fc, + 0x4a471bc7, 0x7a9523a2, 0x2be36b0d, 0x1b315368, 0x096552c9, 0x39b76aac, + 0x68c12203, 0x58131a66, 0xca2db35d, 0xfaff8b38, 0xab89c397, 0x9b5bfbf2, + 0x8a18e710, 0xbacadf75, 0xebbc97da, 0xdb6eafbf, 0x49500684, 0x79823ee1, + 0x28f4764e, 0x18264e2b, 0x18b8ea18, 0x286ad27d, 0x791c9ad2, 0x49cea2b7, + 0xdbf00b8c, 0xeb2233e9, 0xba547b46, 0x8a864323, 0x9bc55fc1, 0xab1767a4, + 0xfa612f0b, 0xcab3176e, 0x588dbe55, 0x685f8630, 0x3929ce9f, 0x09fbf6fa, + 0x1baff75b, 0x2b7dcf3e, 0x7a0b8791, 0x4ad9bff4, 0xd8e716cf, 0xe8352eaa, + 0xb9436605, 0x89915e60, 0x98d24282, 0xa8007ae7, 0xf9763248, 0xc9a40a2d, + 0x5b9aa316, 0x6b489b73, 0x3a3ed3dc, 0x0aecebb9, 0x1e96d09e, 0x2e44e8fb, + 0x7f32a054, 0x4fe09831, 0xddde310a, 0xed0c096f, 0xbc7a41c0, 0x8ca879a5, + 0x9deb6547, 0xad395d22, 0xfc4f158d, 0xcc9d2de8, 0x5ea384d3, 0x6e71bcb6, + 0x3f07f419, 0x0fd5cc7c, 0x1d81cddd, 0x2d53f5b8, 0x7c25bd17, 0x4cf78572, + 0xdec92c49, 0xee1b142c, 0xbf6d5c83, 0x8fbf64e6, 0x9efc7804, 0xae2e4061, + 0xff5808ce, 0xcf8a30ab, 0x5db49990, 0x6d66a1f5, 0x3c10e95a, 0x0cc2d13f, + 0x14e49f14, 0x2436a771, 0x7540efde, 0x4592d7bb, 0xd7ac7e80, 0xe77e46e5, + 0xb6080e4a, 0x86da362f, 0x97992acd, 0xa74b12a8, 0xf63d5a07, 0xc6ef6262, + 0x54d1cb59, 0x6403f33c, 0x3575bb93, 0x05a783f6, 0x17f38257, 0x2721ba32, + 0x7657f29d, 0x4685caf8, 0xd4bb63c3, 0xe4695ba6, 0xb51f1309, 0x85cd2b6c, + 0x948e378e, 0xa45c0feb, 0xf52a4744, 0xc5f87f21, 0x57c6d61a, 0x6714ee7f, + 0x3662a6d0, 0x06b09eb5, 0x12caa592, 0x22189df7, 0x736ed558, 0x43bced3d, + 0xd1824406, 0xe1507c63, 0xb02634cc, 0x80f40ca9, 0x91b7104b, 0xa165282e, + 0xf0136081, 0xc0c158e4, 0x52fff1df, 0x622dc9ba, 0x335b8115, 0x0389b970, + 0x11ddb8d1, 0x210f80b4, 0x7079c81b, 0x40abf07e, 0xd2955945, 0xe2476120, + 0xb331298f, 0x83e311ea, 0x92a00d08, 0xa272356d, 0xf3047dc2, 0xc3d645a7, + 0x51e8ec9c, 0x613ad4f9, 0x304c9c56, 0x009ea433}; + +const uint32_t kStrideExtensionTable1[256] = { + 0x00000000, 0x54075546, 0xa80eaa8c, 0xfc09ffca, 0x55f123e9, 0x01f676af, + 0xfdff8965, 0xa9f8dc23, 0xabe247d2, 0xffe51294, 0x03eced5e, 0x57ebb818, + 0xfe13643b, 0xaa14317d, 0x561dceb7, 0x021a9bf1, 0x5228f955, 0x062fac13, + 0xfa2653d9, 0xae21069f, 0x07d9dabc, 0x53de8ffa, 0xafd77030, 0xfbd02576, + 0xf9cabe87, 0xadcdebc1, 0x51c4140b, 0x05c3414d, 0xac3b9d6e, 0xf83cc828, + 0x043537e2, 0x503262a4, 0xa451f2aa, 0xf056a7ec, 0x0c5f5826, 0x58580d60, + 0xf1a0d143, 0xa5a78405, 0x59ae7bcf, 0x0da92e89, 0x0fb3b578, 0x5bb4e03e, + 0xa7bd1ff4, 0xf3ba4ab2, 0x5a429691, 0x0e45c3d7, 0xf24c3c1d, 0xa64b695b, + 0xf6790bff, 0xa27e5eb9, 0x5e77a173, 0x0a70f435, 0xa3882816, 0xf78f7d50, + 0x0b86829a, 0x5f81d7dc, 0x5d9b4c2d, 0x099c196b, 0xf595e6a1, 0xa192b3e7, + 0x086a6fc4, 0x5c6d3a82, 0xa064c548, 0xf463900e, 0x4d4f93a5, 0x1948c6e3, + 0xe5413929, 0xb1466c6f, 0x18beb04c, 0x4cb9e50a, 0xb0b01ac0, 0xe4b74f86, + 0xe6add477, 0xb2aa8131, 0x4ea37efb, 0x1aa42bbd, 0xb35cf79e, 0xe75ba2d8, + 0x1b525d12, 0x4f550854, 0x1f676af0, 0x4b603fb6, 0xb769c07c, 0xe36e953a, + 0x4a964919, 0x1e911c5f, 0xe298e395, 0xb69fb6d3, 0xb4852d22, 0xe0827864, + 0x1c8b87ae, 0x488cd2e8, 0xe1740ecb, 0xb5735b8d, 0x497aa447, 0x1d7df101, + 0xe91e610f, 0xbd193449, 0x4110cb83, 0x15179ec5, 0xbcef42e6, 0xe8e817a0, + 0x14e1e86a, 0x40e6bd2c, 0x42fc26dd, 0x16fb739b, 0xeaf28c51, 0xbef5d917, + 0x170d0534, 0x430a5072, 0xbf03afb8, 0xeb04fafe, 0xbb36985a, 0xef31cd1c, + 0x133832d6, 0x473f6790, 0xeec7bbb3, 0xbac0eef5, 0x46c9113f, 0x12ce4479, + 0x10d4df88, 0x44d38ace, 0xb8da7504, 0xecdd2042, 0x4525fc61, 0x1122a927, + 0xed2b56ed, 0xb92c03ab, 0x9a9f274a, 0xce98720c, 0x32918dc6, 0x6696d880, + 0xcf6e04a3, 0x9b6951e5, 0x6760ae2f, 0x3367fb69, 0x317d6098, 0x657a35de, + 0x9973ca14, 0xcd749f52, 0x648c4371, 0x308b1637, 0xcc82e9fd, 0x9885bcbb, + 0xc8b7de1f, 0x9cb08b59, 0x60b97493, 0x34be21d5, 0x9d46fdf6, 0xc941a8b0, + 0x3548577a, 0x614f023c, 0x635599cd, 0x3752cc8b, 0xcb5b3341, 0x9f5c6607, + 0x36a4ba24, 0x62a3ef62, 0x9eaa10a8, 0xcaad45ee, 0x3eced5e0, 0x6ac980a6, + 0x96c07f6c, 0xc2c72a2a, 0x6b3ff609, 0x3f38a34f, 0xc3315c85, 0x973609c3, + 0x952c9232, 0xc12bc774, 0x3d2238be, 0x69256df8, 0xc0ddb1db, 0x94dae49d, + 0x68d31b57, 0x3cd44e11, 0x6ce62cb5, 0x38e179f3, 0xc4e88639, 0x90efd37f, + 0x39170f5c, 0x6d105a1a, 0x9119a5d0, 0xc51ef096, 0xc7046b67, 0x93033e21, + 0x6f0ac1eb, 0x3b0d94ad, 0x92f5488e, 0xc6f21dc8, 0x3afbe202, 0x6efcb744, + 0xd7d0b4ef, 0x83d7e1a9, 0x7fde1e63, 0x2bd94b25, 0x82219706, 0xd626c240, + 0x2a2f3d8a, 0x7e2868cc, 0x7c32f33d, 0x2835a67b, 0xd43c59b1, 0x803b0cf7, + 0x29c3d0d4, 0x7dc48592, 0x81cd7a58, 0xd5ca2f1e, 0x85f84dba, 0xd1ff18fc, + 0x2df6e736, 0x79f1b270, 0xd0096e53, 0x840e3b15, 0x7807c4df, 0x2c009199, + 0x2e1a0a68, 0x7a1d5f2e, 0x8614a0e4, 0xd213f5a2, 0x7beb2981, 0x2fec7cc7, + 0xd3e5830d, 0x87e2d64b, 0x73814645, 0x27861303, 0xdb8fecc9, 0x8f88b98f, + 0x267065ac, 0x727730ea, 0x8e7ecf20, 0xda799a66, 0xd8630197, 0x8c6454d1, + 0x706dab1b, 0x246afe5d, 0x8d92227e, 0xd9957738, 0x259c88f2, 0x719bddb4, + 0x21a9bf10, 0x75aeea56, 0x89a7159c, 0xdda040da, 0x74589cf9, 0x205fc9bf, + 0xdc563675, 0x88516333, 0x8a4bf8c2, 0xde4cad84, 0x2245524e, 0x76420708, + 0xdfbadb2b, 0x8bbd8e6d, 0x77b471a7, 0x23b324e1}; + +const uint32_t kStrideExtensionTable2[256] = { + 0x00000000, 0x678efd01, 0xcf1dfa02, 0xa8930703, 0x9bd782f5, 0xfc597ff4, + 0x54ca78f7, 0x334485f6, 0x3243731b, 0x55cd8e1a, 0xfd5e8919, 0x9ad07418, + 0xa994f1ee, 0xce1a0cef, 0x66890bec, 0x0107f6ed, 0x6486e636, 0x03081b37, + 0xab9b1c34, 0xcc15e135, 0xff5164c3, 0x98df99c2, 0x304c9ec1, 0x57c263c0, + 0x56c5952d, 0x314b682c, 0x99d86f2f, 0xfe56922e, 0xcd1217d8, 0xaa9cead9, + 0x020fedda, 0x658110db, 0xc90dcc6c, 0xae83316d, 0x0610366e, 0x619ecb6f, + 0x52da4e99, 0x3554b398, 0x9dc7b49b, 0xfa49499a, 0xfb4ebf77, 0x9cc04276, + 0x34534575, 0x53ddb874, 0x60993d82, 0x0717c083, 0xaf84c780, 0xc80a3a81, + 0xad8b2a5a, 0xca05d75b, 0x6296d058, 0x05182d59, 0x365ca8af, 0x51d255ae, + 0xf94152ad, 0x9ecfafac, 0x9fc85941, 0xf846a440, 0x50d5a343, 0x375b5e42, + 0x041fdbb4, 0x639126b5, 0xcb0221b6, 0xac8cdcb7, 0x97f7ee29, 0xf0791328, + 0x58ea142b, 0x3f64e92a, 0x0c206cdc, 0x6bae91dd, 0xc33d96de, 0xa4b36bdf, + 0xa5b49d32, 0xc23a6033, 0x6aa96730, 0x0d279a31, 0x3e631fc7, 0x59ede2c6, + 0xf17ee5c5, 0x96f018c4, 0xf371081f, 0x94fff51e, 0x3c6cf21d, 0x5be20f1c, + 0x68a68aea, 0x0f2877eb, 0xa7bb70e8, 0xc0358de9, 0xc1327b04, 0xa6bc8605, + 0x0e2f8106, 0x69a17c07, 0x5ae5f9f1, 0x3d6b04f0, 0x95f803f3, 0xf276fef2, + 0x5efa2245, 0x3974df44, 0x91e7d847, 0xf6692546, 0xc52da0b0, 0xa2a35db1, + 0x0a305ab2, 0x6dbea7b3, 0x6cb9515e, 0x0b37ac5f, 0xa3a4ab5c, 0xc42a565d, + 0xf76ed3ab, 0x90e02eaa, 0x387329a9, 0x5ffdd4a8, 0x3a7cc473, 0x5df23972, + 0xf5613e71, 0x92efc370, 0xa1ab4686, 0xc625bb87, 0x6eb6bc84, 0x09384185, + 0x083fb768, 0x6fb14a69, 0xc7224d6a, 0xa0acb06b, 0x93e8359d, 0xf466c89c, + 0x5cf5cf9f, 0x3b7b329e, 0x2a03aaa3, 0x4d8d57a2, 0xe51e50a1, 0x8290ada0, + 0xb1d42856, 0xd65ad557, 0x7ec9d254, 0x19472f55, 0x1840d9b8, 0x7fce24b9, + 0xd75d23ba, 0xb0d3debb, 0x83975b4d, 0xe419a64c, 0x4c8aa14f, 0x2b045c4e, + 0x4e854c95, 0x290bb194, 0x8198b697, 0xe6164b96, 0xd552ce60, 0xb2dc3361, + 0x1a4f3462, 0x7dc1c963, 0x7cc63f8e, 0x1b48c28f, 0xb3dbc58c, 0xd455388d, + 0xe711bd7b, 0x809f407a, 0x280c4779, 0x4f82ba78, 0xe30e66cf, 0x84809bce, + 0x2c139ccd, 0x4b9d61cc, 0x78d9e43a, 0x1f57193b, 0xb7c41e38, 0xd04ae339, + 0xd14d15d4, 0xb6c3e8d5, 0x1e50efd6, 0x79de12d7, 0x4a9a9721, 0x2d146a20, + 0x85876d23, 0xe2099022, 0x878880f9, 0xe0067df8, 0x48957afb, 0x2f1b87fa, + 0x1c5f020c, 0x7bd1ff0d, 0xd342f80e, 0xb4cc050f, 0xb5cbf3e2, 0xd2450ee3, + 0x7ad609e0, 0x1d58f4e1, 0x2e1c7117, 0x49928c16, 0xe1018b15, 0x868f7614, + 0xbdf4448a, 0xda7ab98b, 0x72e9be88, 0x15674389, 0x2623c67f, 0x41ad3b7e, + 0xe93e3c7d, 0x8eb0c17c, 0x8fb73791, 0xe839ca90, 0x40aacd93, 0x27243092, + 0x1460b564, 0x73ee4865, 0xdb7d4f66, 0xbcf3b267, 0xd972a2bc, 0xbefc5fbd, + 0x166f58be, 0x71e1a5bf, 0x42a52049, 0x252bdd48, 0x8db8da4b, 0xea36274a, + 0xeb31d1a7, 0x8cbf2ca6, 0x242c2ba5, 0x43a2d6a4, 0x70e65352, 0x1768ae53, + 0xbffba950, 0xd8755451, 0x74f988e6, 0x137775e7, 0xbbe472e4, 0xdc6a8fe5, + 0xef2e0a13, 0x88a0f712, 0x2033f011, 0x47bd0d10, 0x46bafbfd, 0x213406fc, + 0x89a701ff, 0xee29fcfe, 0xdd6d7908, 0xbae38409, 0x1270830a, 0x75fe7e0b, + 0x107f6ed0, 0x77f193d1, 0xdf6294d2, 0xb8ec69d3, 0x8ba8ec25, 0xec261124, + 0x44b51627, 0x233beb26, 0x223c1dcb, 0x45b2e0ca, 0xed21e7c9, 0x8aaf1ac8, + 0xb9eb9f3e, 0xde65623f, 0x76f6653c, 0x1178983d}; + +const uint32_t kStrideExtensionTable3[256] = { + 0x00000000, 0xf20c0dfe, 0xe1f46d0d, 0x13f860f3, 0xc604aceb, 0x3408a115, + 0x27f0c1e6, 0xd5fccc18, 0x89e52f27, 0x7be922d9, 0x6811422a, 0x9a1d4fd4, + 0x4fe183cc, 0xbded8e32, 0xae15eec1, 0x5c19e33f, 0x162628bf, 0xe42a2541, + 0xf7d245b2, 0x05de484c, 0xd0228454, 0x222e89aa, 0x31d6e959, 0xc3dae4a7, + 0x9fc30798, 0x6dcf0a66, 0x7e376a95, 0x8c3b676b, 0x59c7ab73, 0xabcba68d, + 0xb833c67e, 0x4a3fcb80, 0x2c4c517e, 0xde405c80, 0xcdb83c73, 0x3fb4318d, + 0xea48fd95, 0x1844f06b, 0x0bbc9098, 0xf9b09d66, 0xa5a97e59, 0x57a573a7, + 0x445d1354, 0xb6511eaa, 0x63add2b2, 0x91a1df4c, 0x8259bfbf, 0x7055b241, + 0x3a6a79c1, 0xc866743f, 0xdb9e14cc, 0x29921932, 0xfc6ed52a, 0x0e62d8d4, + 0x1d9ab827, 0xef96b5d9, 0xb38f56e6, 0x41835b18, 0x527b3beb, 0xa0773615, + 0x758bfa0d, 0x8787f7f3, 0x947f9700, 0x66739afe, 0x5898a2fc, 0xaa94af02, + 0xb96ccff1, 0x4b60c20f, 0x9e9c0e17, 0x6c9003e9, 0x7f68631a, 0x8d646ee4, + 0xd17d8ddb, 0x23718025, 0x3089e0d6, 0xc285ed28, 0x17792130, 0xe5752cce, + 0xf68d4c3d, 0x048141c3, 0x4ebe8a43, 0xbcb287bd, 0xaf4ae74e, 0x5d46eab0, + 0x88ba26a8, 0x7ab62b56, 0x694e4ba5, 0x9b42465b, 0xc75ba564, 0x3557a89a, + 0x26afc869, 0xd4a3c597, 0x015f098f, 0xf3530471, 0xe0ab6482, 0x12a7697c, + 0x74d4f382, 0x86d8fe7c, 0x95209e8f, 0x672c9371, 0xb2d05f69, 0x40dc5297, + 0x53243264, 0xa1283f9a, 0xfd31dca5, 0x0f3dd15b, 0x1cc5b1a8, 0xeec9bc56, + 0x3b35704e, 0xc9397db0, 0xdac11d43, 0x28cd10bd, 0x62f2db3d, 0x90fed6c3, + 0x8306b630, 0x710abbce, 0xa4f677d6, 0x56fa7a28, 0x45021adb, 0xb70e1725, + 0xeb17f41a, 0x191bf9e4, 0x0ae39917, 0xf8ef94e9, 0x2d1358f1, 0xdf1f550f, + 0xcce735fc, 0x3eeb3802, 0xb13145f8, 0x433d4806, 0x50c528f5, 0xa2c9250b, + 0x7735e913, 0x8539e4ed, 0x96c1841e, 0x64cd89e0, 0x38d46adf, 0xcad86721, + 0xd92007d2, 0x2b2c0a2c, 0xfed0c634, 0x0cdccbca, 0x1f24ab39, 0xed28a6c7, + 0xa7176d47, 0x551b60b9, 0x46e3004a, 0xb4ef0db4, 0x6113c1ac, 0x931fcc52, + 0x80e7aca1, 0x72eba15f, 0x2ef24260, 0xdcfe4f9e, 0xcf062f6d, 0x3d0a2293, + 0xe8f6ee8b, 0x1afae375, 0x09028386, 0xfb0e8e78, 0x9d7d1486, 0x6f711978, + 0x7c89798b, 0x8e857475, 0x5b79b86d, 0xa975b593, 0xba8dd560, 0x4881d89e, + 0x14983ba1, 0xe694365f, 0xf56c56ac, 0x07605b52, 0xd29c974a, 0x20909ab4, + 0x3368fa47, 0xc164f7b9, 0x8b5b3c39, 0x795731c7, 0x6aaf5134, 0x98a35cca, + 0x4d5f90d2, 0xbf539d2c, 0xacabfddf, 0x5ea7f021, 0x02be131e, 0xf0b21ee0, + 0xe34a7e13, 0x114673ed, 0xc4babff5, 0x36b6b20b, 0x254ed2f8, 0xd742df06, + 0xe9a9e704, 0x1ba5eafa, 0x085d8a09, 0xfa5187f7, 0x2fad4bef, 0xdda14611, + 0xce5926e2, 0x3c552b1c, 0x604cc823, 0x9240c5dd, 0x81b8a52e, 0x73b4a8d0, + 0xa64864c8, 0x54446936, 0x47bc09c5, 0xb5b0043b, 0xff8fcfbb, 0x0d83c245, + 0x1e7ba2b6, 0xec77af48, 0x398b6350, 0xcb876eae, 0xd87f0e5d, 0x2a7303a3, + 0x766ae09c, 0x8466ed62, 0x979e8d91, 0x6592806f, 0xb06e4c77, 0x42624189, + 0x519a217a, 0xa3962c84, 0xc5e5b67a, 0x37e9bb84, 0x2411db77, 0xd61dd689, + 0x03e11a91, 0xf1ed176f, 0xe215779c, 0x10197a62, 0x4c00995d, 0xbe0c94a3, + 0xadf4f450, 0x5ff8f9ae, 0x8a0435b6, 0x78083848, 0x6bf058bb, 0x99fc5545, + 0xd3c39ec5, 0x21cf933b, 0x3237f3c8, 0xc03bfe36, 0x15c7322e, 0xe7cb3fd0, + 0xf4335f23, 0x063f52dd, 0x5a26b1e2, 0xa82abc1c, 0xbbd2dcef, 0x49ded111, + 0x9c221d09, 0x6e2e10f7, 0x7dd67004, 0x8fda7dfa}; + +constexpr const ptrdiff_t kPrefetchHorizon = 256; + +} // namespace + +namespace crc32c { + +uint32_t ExtendPortable(uint32_t crc, const uint8_t* data, size_t size) { + const uint8_t* p = data; + const uint8_t* e = p + size; + uint32_t l = crc ^ kCRC32Xor; + +// Process one byte at a time. +#define STEP1 \ + do { \ + int c = (l & 0xff) ^ *p++; \ + l = kByteExtensionTable[c] ^ (l >> 8); \ + } while (0) + +// Process one of the 4 strides of 4-byte data. +#define STEP4(s) \ + do { \ + crc##s = ReadUint32LE(p + s * 4) ^ kStrideExtensionTable3[crc##s & 0xff] ^ \ + kStrideExtensionTable2[(crc##s >> 8) & 0xff] ^ \ + kStrideExtensionTable1[(crc##s >> 16) & 0xff] ^ \ + kStrideExtensionTable0[crc##s >> 24]; \ + } while (0) + +// Process a 16-byte swath of 4 strides, each of which has 4 bytes of data. +#define STEP16 \ + do { \ + STEP4(0); \ + STEP4(1); \ + STEP4(2); \ + STEP4(3); \ + p += 16; \ + } while (0) + +// Process 4 bytes that were already loaded into a word. +#define STEP4W(w) \ + do { \ + w ^= l; \ + for (size_t i = 0; i < 4; ++i) { \ + w = (w >> 8) ^ kByteExtensionTable[w & 0xff]; \ + } \ + l = w; \ + } while (0) + + // Point x at first 4-byte aligned byte in the buffer. This might be past the + // end of the buffer. + const uint8_t* x = RoundUp<4>(p); + if (x <= e) { + // Process bytes p is 4-byte aligned. + while (p != x) { + STEP1; + } + } + + if ((e - p) >= 16) { + // Load a 16-byte swath into the stride partial results. + uint32_t crc0 = ReadUint32LE(p + 0 * 4) ^ l; + uint32_t crc1 = ReadUint32LE(p + 1 * 4); + uint32_t crc2 = ReadUint32LE(p + 2 * 4); + uint32_t crc3 = ReadUint32LE(p + 3 * 4); + p += 16; + + while ((e - p) > kPrefetchHorizon) { + RequestPrefetch(p + kPrefetchHorizon); + + // Process 64 bytes at a time. + STEP16; + STEP16; + STEP16; + STEP16; + } + + // Process one 16-byte swath at a time. + while ((e - p) >= 16) { + STEP16; + } + + // Advance one word at a time as far as possible. + while ((e - p) >= 4) { + STEP4(0); + uint32_t tmp = crc0; + crc0 = crc1; + crc1 = crc2; + crc2 = crc3; + crc3 = tmp; + p += 4; + } + + // Combine the 4 partial stride results. + l = 0; + STEP4W(crc0); + STEP4W(crc1); + STEP4W(crc2); + STEP4W(crc3); + } + + // Process the last few bytes. + while (p != e) { + STEP1; + } +#undef STEP4W +#undef STEP16 +#undef STEP4 +#undef STEP1 + return l ^ kCRC32Xor; +} + +} // namespace crc32c diff --git a/src/crc32c_portable_unittest.cc b/src/crc32c_portable_unittest.cc new file mode 100644 index 0000000000..5098e2c373 --- /dev/null +++ b/src/crc32c_portable_unittest.cc @@ -0,0 +1,20 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "gtest/gtest.h" + +#include "./crc32c_extend_unittests.h" +#include "./crc32c_internal.h" + +namespace crc32c { + +struct PortableTestTraits { + static uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count) { + return ExtendPortable(crc, data, count); + } +}; + +INSTANTIATE_TYPED_TEST_SUITE_P(Portable, ExtendTest, PortableTestTraits); + +} // namespace crc32c diff --git a/src/crc32c_prefetch.h b/src/crc32c_prefetch.h new file mode 100644 index 0000000000..aec7d54e84 --- /dev/null +++ b/src/crc32c_prefetch.h @@ -0,0 +1,46 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_PREFETCH_H_ +#define CRC32C_CRC32C_PREFETCH_H_ + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_MM_PREFETCH + +#if defined(_MSC_VER) +#include <intrin.h> +#else // !defined(_MSC_VER) +#include <xmmintrin.h> +#endif // defined(_MSC_VER) + +#endif // HAVE_MM_PREFETCH + +namespace crc32c { + +// Ask the hardware to prefetch the data at the given address into the L1 cache. +inline void RequestPrefetch(const uint8_t* address) { +#if HAVE_BUILTIN_PREFETCH + // Clang and GCC implement the __builtin_prefetch non-standard extension, + // which maps to the best instruction on the target architecture. + __builtin_prefetch(reinterpret_cast<const char*>(address), 0 /* Read only. */, + 0 /* No temporal locality. */); +#elif HAVE_MM_PREFETCH + // Visual Studio doesn't implement __builtin_prefetch, but exposes the + // PREFETCHNTA instruction via the _mm_prefetch intrinsic. + _mm_prefetch(reinterpret_cast<const char*>(address), _MM_HINT_NTA); +#else + // No prefetch support. Silence compiler warnings. + (void)address; +#endif // HAVE_BUILTIN_PREFETCH +} + +} // namespace crc32c + +#endif // CRC32C_CRC32C_ROUND_UP_H_ diff --git a/src/crc32c_prefetch_unittest.cc b/src/crc32c_prefetch_unittest.cc new file mode 100644 index 0000000000..b34ed2d5fe --- /dev/null +++ b/src/crc32c_prefetch_unittest.cc @@ -0,0 +1,9 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_prefetch.h" + +// There is no easy way to test cache prefetching. We can only test that the +// crc32c_prefetch.h header compiles on its own, so it doesn't have any unstated +// dependencies. diff --git a/src/crc32c_read_le.h b/src/crc32c_read_le.h new file mode 100644 index 0000000000..3bd45fe3aa --- /dev/null +++ b/src/crc32c_read_le.h @@ -0,0 +1,53 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_READ_LE_H_ +#define CRC32C_CRC32C_READ_LE_H_ + +#include <cstdint> +#include <cstring> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +namespace crc32c { + +// Reads a little-endian 32-bit integer from a 32-bit-aligned buffer. +inline uint32_t ReadUint32LE(const uint8_t* buffer) { +#if BYTE_ORDER_BIG_ENDIAN + return ((static_cast<uint32_t>(static_cast<uint8_t>(buffer[0]))) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[1])) << 8) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[2])) << 16) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[3])) << 24)); +#else // !BYTE_ORDER_BIG_ENDIAN + uint32_t result; + // This should be optimized to a single instruction. + std::memcpy(&result, buffer, sizeof(result)); + return result; +#endif // BYTE_ORDER_BIG_ENDIAN +} + +// Reads a little-endian 64-bit integer from a 64-bit-aligned buffer. +inline uint64_t ReadUint64LE(const uint8_t* buffer) { +#if BYTE_ORDER_BIG_ENDIAN + return ((static_cast<uint32_t>(static_cast<uint8_t>(buffer[0]))) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[1])) << 8) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[2])) << 16) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[3])) << 24) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[4])) << 32) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[5])) << 40) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[6])) << 48) | + (static_cast<uint32_t>(static_cast<uint8_t>(buffer[7])) << 56)); +#else // !BYTE_ORDER_BIG_ENDIAN + uint64_t result; + // This should be optimized to a single instruction. + std::memcpy(&result, buffer, sizeof(result)); + return result; +#endif // BYTE_ORDER_BIG_ENDIAN +} + +} // namespace crc32c + +#endif // CRC32C_CRC32C_READ_LE_H_ diff --git a/src/crc32c_read_le_unittest.cc b/src/crc32c_read_le_unittest.cc new file mode 100644 index 0000000000..2a30302adf --- /dev/null +++ b/src/crc32c_read_le_unittest.cc @@ -0,0 +1,32 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_read_le.h" + +#include <cstddef> +#include <cstdint> + +#include "gtest/gtest.h" + +#include "./crc32c_round_up.h" + +namespace crc32c { + +TEST(Crc32CReadLETest, ReadUint32LE) { + // little-endian 0x12345678 + alignas(4) uint8_t bytes[] = {0x78, 0x56, 0x34, 0x12}; + + ASSERT_EQ(RoundUp<4>(bytes), bytes) << "Stack array is not aligned"; + EXPECT_EQ(static_cast<uint32_t>(0x12345678), ReadUint32LE(bytes)); +} + +TEST(Crc32CReadLETest, ReadUint64LE) { + // little-endian 0x123456789ABCDEF0 + alignas(8) uint8_t bytes[] = {0xF0, 0xDE, 0xBC, 0x9A, 0x78, 0x56, 0x34, 0x12}; + + ASSERT_EQ(RoundUp<8>(bytes), bytes) << "Stack array is not aligned"; + EXPECT_EQ(static_cast<uint64_t>(0x123456789ABCDEF0), ReadUint64LE(bytes)); +} + +} // namespace crc32c diff --git a/src/crc32c_round_up.h b/src/crc32c_round_up.h new file mode 100644 index 0000000000..d3b922beb9 --- /dev/null +++ b/src/crc32c_round_up.h @@ -0,0 +1,34 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_ROUND_UP_H_ +#define CRC32C_CRC32C_ROUND_UP_H_ + +#include <cstddef> +#include <cstdint> + +namespace crc32c { + +// Returns the smallest number >= the given number that is evenly divided by N. +// +// N must be a power of two. +template <int N> +constexpr inline uintptr_t RoundUp(uintptr_t pointer) { + static_assert((N & (N - 1)) == 0, "N must be a power of two"); + return (pointer + (N - 1)) & ~(N - 1); +} + +// Returns the smallest address >= the given address that is aligned to N bytes. +// +// N must be a power of two. +template <int N> +constexpr inline const uint8_t* RoundUp(const uint8_t* pointer) { + static_assert((N & (N - 1)) == 0, "N must be a power of two"); + return reinterpret_cast<uint8_t*>( + RoundUp<N>(reinterpret_cast<uintptr_t>(pointer))); +} + +} // namespace crc32c + +#endif // CRC32C_CRC32C_ROUND_UP_H_ diff --git a/src/crc32c_round_up_unittest.cc b/src/crc32c_round_up_unittest.cc new file mode 100644 index 0000000000..5ff657bb5c --- /dev/null +++ b/src/crc32c_round_up_unittest.cc @@ -0,0 +1,84 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_round_up.h" + +#include <cstddef> +#include <cstdint> + +#include "gtest/gtest.h" + +namespace crc32c { + +TEST(CRC32CRoundUpTest, RoundUpUintptr) { + uintptr_t zero = 0; + + ASSERT_EQ(zero, RoundUp<1>(zero)); + ASSERT_EQ(1U, RoundUp<1>(1U)); + ASSERT_EQ(2U, RoundUp<1>(2U)); + ASSERT_EQ(3U, RoundUp<1>(3U)); + ASSERT_EQ(~static_cast<uintptr_t>(0), RoundUp<1>(~static_cast<uintptr_t>(0))); + ASSERT_EQ(~static_cast<uintptr_t>(1), RoundUp<1>(~static_cast<uintptr_t>(1))); + ASSERT_EQ(~static_cast<uintptr_t>(2), RoundUp<1>(~static_cast<uintptr_t>(2))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<1>(~static_cast<uintptr_t>(3))); + + ASSERT_EQ(zero, RoundUp<2>(zero)); + ASSERT_EQ(2U, RoundUp<2>(1U)); + ASSERT_EQ(2U, RoundUp<2>(2U)); + ASSERT_EQ(4U, RoundUp<2>(3U)); + ASSERT_EQ(4U, RoundUp<2>(4U)); + ASSERT_EQ(6U, RoundUp<2>(5U)); + ASSERT_EQ(6U, RoundUp<2>(6U)); + ASSERT_EQ(8U, RoundUp<2>(7U)); + ASSERT_EQ(8U, RoundUp<2>(8U)); + ASSERT_EQ(~static_cast<uintptr_t>(1), RoundUp<2>(~static_cast<uintptr_t>(1))); + ASSERT_EQ(~static_cast<uintptr_t>(1), RoundUp<2>(~static_cast<uintptr_t>(2))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<2>(~static_cast<uintptr_t>(3))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<2>(~static_cast<uintptr_t>(4))); + + ASSERT_EQ(zero, RoundUp<4>(zero)); + ASSERT_EQ(4U, RoundUp<4>(1U)); + ASSERT_EQ(4U, RoundUp<4>(2U)); + ASSERT_EQ(4U, RoundUp<4>(3U)); + ASSERT_EQ(4U, RoundUp<4>(4U)); + ASSERT_EQ(8U, RoundUp<4>(5U)); + ASSERT_EQ(8U, RoundUp<4>(6U)); + ASSERT_EQ(8U, RoundUp<4>(7U)); + ASSERT_EQ(8U, RoundUp<4>(8U)); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<4>(~static_cast<uintptr_t>(3))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<4>(~static_cast<uintptr_t>(4))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<4>(~static_cast<uintptr_t>(5))); + ASSERT_EQ(~static_cast<uintptr_t>(3), RoundUp<4>(~static_cast<uintptr_t>(6))); + ASSERT_EQ(~static_cast<uintptr_t>(7), RoundUp<4>(~static_cast<uintptr_t>(7))); + ASSERT_EQ(~static_cast<uintptr_t>(7), RoundUp<4>(~static_cast<uintptr_t>(8))); + ASSERT_EQ(~static_cast<uintptr_t>(7), RoundUp<4>(~static_cast<uintptr_t>(9))); +} + +TEST(CRC32CRoundUpTest, RoundUpPointer) { + uintptr_t zero = 0, three = 3, four = 4, seven = 7, eight = 8; + + const uint8_t* zero_ptr = reinterpret_cast<const uint8_t*>(zero); + const uint8_t* three_ptr = reinterpret_cast<const uint8_t*>(three); + const uint8_t* four_ptr = reinterpret_cast<const uint8_t*>(four); + const uint8_t* seven_ptr = reinterpret_cast<const uint8_t*>(seven); + const uint8_t* eight_ptr = reinterpret_cast<uint8_t*>(eight); + + ASSERT_EQ(zero_ptr, RoundUp<1>(zero_ptr)); + ASSERT_EQ(zero_ptr, RoundUp<4>(zero_ptr)); + ASSERT_EQ(zero_ptr, RoundUp<8>(zero_ptr)); + + ASSERT_EQ(three_ptr, RoundUp<1>(three_ptr)); + ASSERT_EQ(four_ptr, RoundUp<4>(three_ptr)); + ASSERT_EQ(eight_ptr, RoundUp<8>(three_ptr)); + + ASSERT_EQ(four_ptr, RoundUp<1>(four_ptr)); + ASSERT_EQ(four_ptr, RoundUp<4>(four_ptr)); + ASSERT_EQ(eight_ptr, RoundUp<8>(four_ptr)); + + ASSERT_EQ(seven_ptr, RoundUp<1>(seven_ptr)); + ASSERT_EQ(eight_ptr, RoundUp<4>(seven_ptr)); + ASSERT_EQ(eight_ptr, RoundUp<8>(four_ptr)); +} + +} // namespace crc32c diff --git a/src/crc32c_sse42.cc b/src/crc32c_sse42.cc new file mode 100644 index 0000000000..139520428e --- /dev/null +++ b/src/crc32c_sse42.cc @@ -0,0 +1,258 @@ +// Copyright 2008 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "./crc32c_sse42.h" + +// In a separate source file to allow this accelerated CRC32C function to be +// compiled with the appropriate compiler flags to enable SSE4.2 instructions. + +// This implementation is loosely based on Intel Pub 323405 from April 2011, +// "Fast CRC Computation for iSCSI Polynomial Using CRC32 Instruction". + +#include <cstddef> +#include <cstdint> + +#include "./crc32c_internal.h" +#include "./crc32c_prefetch.h" +#include "./crc32c_read_le.h" +#include "./crc32c_round_up.h" +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +#if defined(_MSC_VER) +#include <intrin.h> +#else // !defined(_MSC_VER) +#include <nmmintrin.h> +#endif // defined(_MSC_VER) + +namespace crc32c { + +namespace { + +constexpr const ptrdiff_t kGroups = 3; +constexpr const ptrdiff_t kBlock0Size = 16 * 1024 / kGroups / 64 * 64; +constexpr const ptrdiff_t kBlock1Size = 4 * 1024 / kGroups / 8 * 8; +constexpr const ptrdiff_t kBlock2Size = 1024 / kGroups / 8 * 8; + +const uint32_t kBlock0SkipTable[8][16] = { + {0x00000000, 0xff770459, 0xfb027e43, 0x04757a1a, 0xf3e88a77, 0x0c9f8e2e, + 0x08eaf434, 0xf79df06d, 0xe23d621f, 0x1d4a6646, 0x193f1c5c, 0xe6481805, + 0x11d5e868, 0xeea2ec31, 0xead7962b, 0x15a09272}, + {0x00000000, 0xc196b2cf, 0x86c1136f, 0x4757a1a0, 0x086e502f, 0xc9f8e2e0, + 0x8eaf4340, 0x4f39f18f, 0x10dca05e, 0xd14a1291, 0x961db331, 0x578b01fe, + 0x18b2f071, 0xd92442be, 0x9e73e31e, 0x5fe551d1}, + {0x00000000, 0x21b940bc, 0x43728178, 0x62cbc1c4, 0x86e502f0, 0xa75c424c, + 0xc5978388, 0xe42ec334, 0x08267311, 0x299f33ad, 0x4b54f269, 0x6aedb2d5, + 0x8ec371e1, 0xaf7a315d, 0xcdb1f099, 0xec08b025}, + {0x00000000, 0x104ce622, 0x2099cc44, 0x30d52a66, 0x41339888, 0x517f7eaa, + 0x61aa54cc, 0x71e6b2ee, 0x82673110, 0x922bd732, 0xa2fefd54, 0xb2b21b76, + 0xc354a998, 0xd3184fba, 0xe3cd65dc, 0xf38183fe}, + {0x00000000, 0x012214d1, 0x024429a2, 0x03663d73, 0x04885344, 0x05aa4795, + 0x06cc7ae6, 0x07ee6e37, 0x0910a688, 0x0832b259, 0x0b548f2a, 0x0a769bfb, + 0x0d98f5cc, 0x0cbae11d, 0x0fdcdc6e, 0x0efec8bf}, + {0x00000000, 0x12214d10, 0x24429a20, 0x3663d730, 0x48853440, 0x5aa47950, + 0x6cc7ae60, 0x7ee6e370, 0x910a6880, 0x832b2590, 0xb548f2a0, 0xa769bfb0, + 0xd98f5cc0, 0xcbae11d0, 0xfdcdc6e0, 0xefec8bf0}, + {0x00000000, 0x27f8a7f1, 0x4ff14fe2, 0x6809e813, 0x9fe29fc4, 0xb81a3835, + 0xd013d026, 0xf7eb77d7, 0x3a294979, 0x1dd1ee88, 0x75d8069b, 0x5220a16a, + 0xa5cbd6bd, 0x8233714c, 0xea3a995f, 0xcdc23eae}, + {0x00000000, 0x745292f2, 0xe8a525e4, 0x9cf7b716, 0xd4a63d39, 0xa0f4afcb, + 0x3c0318dd, 0x48518a2f, 0xaca00c83, 0xd8f29e71, 0x44052967, 0x3057bb95, + 0x780631ba, 0x0c54a348, 0x90a3145e, 0xe4f186ac}, +}; +const uint32_t kBlock1SkipTable[8][16] = { + {0x00000000, 0x79113270, 0xf22264e0, 0x8b335690, 0xe1a8bf31, 0x98b98d41, + 0x138adbd1, 0x6a9be9a1, 0xc6bd0893, 0xbfac3ae3, 0x349f6c73, 0x4d8e5e03, + 0x2715b7a2, 0x5e0485d2, 0xd537d342, 0xac26e132}, + {0x00000000, 0x889667d7, 0x14c0b95f, 0x9c56de88, 0x298172be, 0xa1171569, + 0x3d41cbe1, 0xb5d7ac36, 0x5302e57c, 0xdb9482ab, 0x47c25c23, 0xcf543bf4, + 0x7a8397c2, 0xf215f015, 0x6e432e9d, 0xe6d5494a}, + {0x00000000, 0xa605caf8, 0x49e7e301, 0xefe229f9, 0x93cfc602, 0x35ca0cfa, + 0xda282503, 0x7c2deffb, 0x2273faf5, 0x8476300d, 0x6b9419f4, 0xcd91d30c, + 0xb1bc3cf7, 0x17b9f60f, 0xf85bdff6, 0x5e5e150e}, + {0x00000000, 0x44e7f5ea, 0x89cfebd4, 0xcd281e3e, 0x1673a159, 0x529454b3, + 0x9fbc4a8d, 0xdb5bbf67, 0x2ce742b2, 0x6800b758, 0xa528a966, 0xe1cf5c8c, + 0x3a94e3eb, 0x7e731601, 0xb35b083f, 0xf7bcfdd5}, + {0x00000000, 0x59ce8564, 0xb39d0ac8, 0xea538fac, 0x62d66361, 0x3b18e605, + 0xd14b69a9, 0x8885eccd, 0xc5acc6c2, 0x9c6243a6, 0x7631cc0a, 0x2fff496e, + 0xa77aa5a3, 0xfeb420c7, 0x14e7af6b, 0x4d292a0f}, + {0x00000000, 0x8eb5fb75, 0x1887801b, 0x96327b6e, 0x310f0036, 0xbfbafb43, + 0x2988802d, 0xa73d7b58, 0x621e006c, 0xecabfb19, 0x7a998077, 0xf42c7b02, + 0x5311005a, 0xdda4fb2f, 0x4b968041, 0xc5237b34}, + {0x00000000, 0xc43c00d8, 0x8d947741, 0x49a87799, 0x1ec49873, 0xdaf898ab, + 0x9350ef32, 0x576cefea, 0x3d8930e6, 0xf9b5303e, 0xb01d47a7, 0x7421477f, + 0x234da895, 0xe771a84d, 0xaed9dfd4, 0x6ae5df0c}, + {0x00000000, 0x7b1261cc, 0xf624c398, 0x8d36a254, 0xe9a5f1c1, 0x92b7900d, + 0x1f813259, 0x64935395, 0xd6a79573, 0xadb5f4bf, 0x208356eb, 0x5b913727, + 0x3f0264b2, 0x4410057e, 0xc926a72a, 0xb234c6e6}, +}; +const uint32_t kBlock2SkipTable[8][16] = { + {0x00000000, 0x8f158014, 0x1bc776d9, 0x94d2f6cd, 0x378eedb2, 0xb89b6da6, + 0x2c499b6b, 0xa35c1b7f, 0x6f1ddb64, 0xe0085b70, 0x74daadbd, 0xfbcf2da9, + 0x589336d6, 0xd786b6c2, 0x4354400f, 0xcc41c01b}, + {0x00000000, 0xde3bb6c8, 0xb99b1b61, 0x67a0ada9, 0x76da4033, 0xa8e1f6fb, + 0xcf415b52, 0x117aed9a, 0xedb48066, 0x338f36ae, 0x542f9b07, 0x8a142dcf, + 0x9b6ec055, 0x4555769d, 0x22f5db34, 0xfcce6dfc}, + {0x00000000, 0xde85763d, 0xb8e69a8b, 0x6663ecb6, 0x742143e7, 0xaaa435da, + 0xccc7d96c, 0x1242af51, 0xe84287ce, 0x36c7f1f3, 0x50a41d45, 0x8e216b78, + 0x9c63c429, 0x42e6b214, 0x24855ea2, 0xfa00289f}, + {0x00000000, 0xd569796d, 0xaf3e842b, 0x7a57fd46, 0x5b917ea7, 0x8ef807ca, + 0xf4affa8c, 0x21c683e1, 0xb722fd4e, 0x624b8423, 0x181c7965, 0xcd750008, + 0xecb383e9, 0x39dafa84, 0x438d07c2, 0x96e47eaf}, + {0x00000000, 0x6ba98c6d, 0xd75318da, 0xbcfa94b7, 0xab4a4745, 0xc0e3cb28, + 0x7c195f9f, 0x17b0d3f2, 0x5378f87b, 0x38d17416, 0x842be0a1, 0xef826ccc, + 0xf832bf3e, 0x939b3353, 0x2f61a7e4, 0x44c82b89}, + {0x00000000, 0xa6f1f0f6, 0x480f971d, 0xeefe67eb, 0x901f2e3a, 0x36eedecc, + 0xd810b927, 0x7ee149d1, 0x25d22a85, 0x8323da73, 0x6dddbd98, 0xcb2c4d6e, + 0xb5cd04bf, 0x133cf449, 0xfdc293a2, 0x5b336354}, + {0x00000000, 0x4ba4550a, 0x9748aa14, 0xdcecff1e, 0x2b7d22d9, 0x60d977d3, + 0xbc3588cd, 0xf791ddc7, 0x56fa45b2, 0x1d5e10b8, 0xc1b2efa6, 0x8a16baac, + 0x7d87676b, 0x36233261, 0xeacfcd7f, 0xa16b9875}, + {0x00000000, 0xadf48b64, 0x5e056039, 0xf3f1eb5d, 0xbc0ac072, 0x11fe4b16, + 0xe20fa04b, 0x4ffb2b2f, 0x7df9f615, 0xd00d7d71, 0x23fc962c, 0x8e081d48, + 0xc1f33667, 0x6c07bd03, 0x9ff6565e, 0x3202dd3a}, +}; + +constexpr const ptrdiff_t kPrefetchHorizon = 256; + +} // namespace + +uint32_t ExtendSse42(uint32_t crc, const uint8_t* data, size_t size) { + const uint8_t* p = data; + const uint8_t* e = data + size; + uint32_t l = crc ^ kCRC32Xor; + +#define STEP1 \ + do { \ + l = _mm_crc32_u8(l, *p++); \ + } while (0) + +#define STEP4(crc) \ + do { \ + crc = _mm_crc32_u32(crc, ReadUint32LE(p)); \ + p += 4; \ + } while (0) + +#define STEP8(crc, data) \ + do { \ + crc = _mm_crc32_u64(crc, ReadUint64LE(data)); \ + data += 8; \ + } while (0) + +#define STEP8BY3(crc0, crc1, crc2, p0, p1, p2) \ + do { \ + STEP8(crc0, p0); \ + STEP8(crc1, p1); \ + STEP8(crc2, p2); \ + } while (0) + +#define STEP8X3(crc0, crc1, crc2, bs) \ + do { \ + crc0 = _mm_crc32_u64(crc0, ReadUint64LE(p)); \ + crc1 = _mm_crc32_u64(crc1, ReadUint64LE(p + bs)); \ + crc2 = _mm_crc32_u64(crc2, ReadUint64LE(p + 2 * bs)); \ + p += 8; \ + } while (0) + +#define SKIP_BLOCK(crc, tab) \ + do { \ + crc = tab[0][crc & 0xf] ^ tab[1][(crc >> 4) & 0xf] ^ \ + tab[2][(crc >> 8) & 0xf] ^ tab[3][(crc >> 12) & 0xf] ^ \ + tab[4][(crc >> 16) & 0xf] ^ tab[5][(crc >> 20) & 0xf] ^ \ + tab[6][(crc >> 24) & 0xf] ^ tab[7][(crc >> 28) & 0xf]; \ + } while (0) + + // Point x at first 8-byte aligned byte in the buffer. This might be past the + // end of the buffer. + const uint8_t* x = RoundUp<8>(p); + if (x <= e) { + // Process bytes p is 8-byte aligned. + while (p != x) { + STEP1; + } + } + + // Proccess the data in predetermined block sizes with tables for quickly + // combining the checksum. Experimentally it's better to use larger block + // sizes where possible so use a hierarchy of decreasing block sizes. + uint64_t l64 = l; + while ((e - p) >= kGroups * kBlock0Size) { + uint64_t l641 = 0; + uint64_t l642 = 0; + for (int i = 0; i < kBlock0Size; i += 8 * 8) { + // Prefetch ahead to hide latency. + RequestPrefetch(p + kPrefetchHorizon); + RequestPrefetch(p + kBlock0Size + kPrefetchHorizon); + RequestPrefetch(p + 2 * kBlock0Size + kPrefetchHorizon); + + // Process 64 bytes at a time. + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + STEP8X3(l64, l641, l642, kBlock0Size); + } + + // Combine results. + SKIP_BLOCK(l64, kBlock0SkipTable); + l64 ^= l641; + SKIP_BLOCK(l64, kBlock0SkipTable); + l64 ^= l642; + p += (kGroups - 1) * kBlock0Size; + } + while ((e - p) >= kGroups * kBlock1Size) { + uint64_t l641 = 0; + uint64_t l642 = 0; + for (int i = 0; i < kBlock1Size; i += 8) { + STEP8X3(l64, l641, l642, kBlock1Size); + } + SKIP_BLOCK(l64, kBlock1SkipTable); + l64 ^= l641; + SKIP_BLOCK(l64, kBlock1SkipTable); + l64 ^= l642; + p += (kGroups - 1) * kBlock1Size; + } + while ((e - p) >= kGroups * kBlock2Size) { + uint64_t l641 = 0; + uint64_t l642 = 0; + for (int i = 0; i < kBlock2Size; i += 8) { + STEP8X3(l64, l641, l642, kBlock2Size); + } + SKIP_BLOCK(l64, kBlock2SkipTable); + l64 ^= l641; + SKIP_BLOCK(l64, kBlock2SkipTable); + l64 ^= l642; + p += (kGroups - 1) * kBlock2Size; + } + + // Process bytes 16 at a time + while ((e - p) >= 16) { + STEP8(l64, p); + STEP8(l64, p); + } + + l = static_cast<uint32_t>(l64); + // Process the last few bytes. + while (p != e) { + STEP1; + } +#undef SKIP_BLOCK +#undef STEP8X3 +#undef STEP8BY3 +#undef STEP8 +#undef STEP4 +#undef STEP1 + + return l ^ kCRC32Xor; +} + +} // namespace crc32c + +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) diff --git a/src/crc32c_sse42.h b/src/crc32c_sse42.h new file mode 100644 index 0000000000..95da926632 --- /dev/null +++ b/src/crc32c_sse42.h @@ -0,0 +1,33 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_SSE42_H_ +#define CRC32C_CRC32C_SSE42_H_ + +// X86-specific code. + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +// The hardware-accelerated implementation is only enabled for 64-bit builds, +// because a straightforward 32-bit implementation actually runs slower than the +// portable version. Most X86 machines are 64-bit nowadays, so it doesn't make +// much sense to spend time building an optimized hardware-accelerated +// implementation. +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +namespace crc32c { + +// SSE4.2-accelerated implementation in crc32c_sse42.cc +uint32_t ExtendSse42(uint32_t crc, const uint8_t* data, size_t count); + +} // namespace crc32c + +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +#endif // CRC32C_CRC32C_SSE42_H_ diff --git a/src/crc32c_sse42_check.h b/src/crc32c_sse42_check.h new file mode 100644 index 0000000000..e7528912a6 --- /dev/null +++ b/src/crc32c_sse42_check.h @@ -0,0 +1,50 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#ifndef CRC32C_CRC32C_SSE42_CHECK_H_ +#define CRC32C_CRC32C_SSE42_CHECK_H_ + +// X86-specific code checking the availability of SSE4.2 instructions. + +#include <cstddef> +#include <cstdint> + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +// If the compiler supports SSE4.2, it definitely supports X86. + +#if defined(_MSC_VER) +#include <intrin.h> + +namespace crc32c { + +inline bool CanUseSse42() { + int cpu_info[4]; + __cpuid(cpu_info, 1); + return (cpu_info[2] & (1 << 20)) != 0; +} + +} // namespace crc32c + +#else // !defined(_MSC_VER) +#include <cpuid.h> + +namespace crc32c { + +inline bool CanUseSse42() { + unsigned int eax, ebx, ecx, edx; + return __get_cpuid(1, &eax, &ebx, &ecx, &edx) && ((ecx & (1 << 20)) != 0); +} + +} // namespace crc32c + +#endif // defined(_MSC_VER) + +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +#endif // CRC32C_CRC32C_SSE42_CHECK_H_ diff --git a/src/crc32c_sse42_unittest.cc b/src/crc32c_sse42_unittest.cc new file mode 100644 index 0000000000..c73ad8ddd1 --- /dev/null +++ b/src/crc32c_sse42_unittest.cc @@ -0,0 +1,24 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "gtest/gtest.h" + +#include "./crc32c_extend_unittests.h" +#include "./crc32c_sse42.h" + +namespace crc32c { + +#if HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +struct Sse42TestTraits { + static uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count) { + return ExtendSse42(crc, data, count); + } +}; + +INSTANTIATE_TYPED_TEST_SUITE_P(Sse42, ExtendTest, Sse42TestTraits); + +#endif // HAVE_SSE42 && (defined(_M_X64) || defined(__x86_64__)) + +} // namespace crc32c diff --git a/src/crc32c_test_main.cc b/src/crc32c_test_main.cc new file mode 100644 index 0000000000..275ee380c6 --- /dev/null +++ b/src/crc32c_test_main.cc @@ -0,0 +1,22 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. + +#ifdef CRC32C_HAVE_CONFIG_H +#include "crc32c/crc32c_config.h" +#endif + +#include "gtest/gtest.h" + +#if CRC32C_TESTS_BUILT_WITH_GLOG +#include "glog/logging.h" +#endif // CRC32C_TESTS_BUILT_WITH_GLOG + +int main(int argc, char** argv) { +#if CRC32C_TESTS_BUILT_WITH_GLOG + google::InitGoogleLogging(argv[0]); + google::InstallFailureSignalHandler(); +#endif // CRC32C_TESTS_BUILT_WITH_GLOG + testing::InitGoogleTest(&argc, argv); + return RUN_ALL_TESTS(); +} diff --git a/src/crc32c_unittest.cc b/src/crc32c_unittest.cc new file mode 100644 index 0000000000..d6c6af680c --- /dev/null +++ b/src/crc32c_unittest.cc @@ -0,0 +1,129 @@ +// Copyright 2017 The CRC32C Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. See the AUTHORS file for names of contributors. + +#include "crc32c/crc32c.h" + +#include <cstddef> +#include <cstdint> +#include <cstring> + +#include "gtest/gtest.h" + +#include "./crc32c_extend_unittests.h" + +TEST(Crc32CTest, Crc32c) { + // From rfc3720 section B.4. + uint8_t buf[32]; + + std::memset(buf, 0, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa), + crc32c::Crc32c(buf, sizeof(buf))); + + std::memset(buf, 0xff, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43), + crc32c::Crc32c(buf, sizeof(buf))); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(i); + EXPECT_EQ(static_cast<uint32_t>(0x46dd794e), + crc32c::Crc32c(buf, sizeof(buf))); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(31 - i); + EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c), + crc32c::Crc32c(buf, sizeof(buf))); + + uint8_t data[48] = { + 0x01, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, + 0x00, 0x00, 0x00, 0x14, 0x00, 0x00, 0x00, 0x18, 0x28, 0x00, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x00, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, + }; + EXPECT_EQ(static_cast<uint32_t>(0xd9963a56), + crc32c::Crc32c(data, sizeof(data))); +} + +namespace crc32c { + +struct ApiTestTraits { + static uint32_t Extend(uint32_t crc, const uint8_t* data, size_t count) { + return ::crc32c::Extend(crc, data, count); + } +}; + +INSTANTIATE_TYPED_TEST_SUITE_P(Api, ExtendTest, ApiTestTraits); + +} // namespace crc32c + +TEST(CRC32CTest, Crc32cCharPointer) { + char buf[32]; + + std::memset(buf, 0, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa), + crc32c::Crc32c(buf, sizeof(buf))); + + std::memset(buf, 0xff, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43), + crc32c::Crc32c(buf, sizeof(buf))); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<char>(i); + EXPECT_EQ(static_cast<uint32_t>(0x46dd794e), + crc32c::Crc32c(buf, sizeof(buf))); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<char>(31 - i); + EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c), + crc32c::Crc32c(buf, sizeof(buf))); +} + +TEST(CRC32CTest, Crc32cStdString) { + std::string buf; + buf.resize(32); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<char>(0x00); + EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa), crc32c::Crc32c(buf)); + + for (size_t i = 0; i < 32; ++i) + buf[i] = '\xff'; + EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43), crc32c::Crc32c(buf)); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<char>(i); + EXPECT_EQ(static_cast<uint32_t>(0x46dd794e), crc32c::Crc32c(buf)); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<char>(31 - i); + EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c), crc32c::Crc32c(buf)); +} + +#if __cplusplus > 201402L +#if __has_include(<string_view>) + +TEST(CRC32CTest, Crc32cStdStringView) { + uint8_t buf[32]; + std::string_view view(reinterpret_cast<const char*>(buf), sizeof(buf)); + + std::memset(buf, 0, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x8a9136aa), crc32c::Crc32c(view)); + + std::memset(buf, 0xff, sizeof(buf)); + EXPECT_EQ(static_cast<uint32_t>(0x62a8ab43), crc32c::Crc32c(view)); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(i); + EXPECT_EQ(static_cast<uint32_t>(0x46dd794e), crc32c::Crc32c(view)); + + for (size_t i = 0; i < 32; ++i) + buf[i] = static_cast<uint8_t>(31 - i); + EXPECT_EQ(static_cast<uint32_t>(0x113fdb5c), crc32c::Crc32c(view)); +} + +#endif // __has_include(<string_view>) +#endif // __cplusplus > 201402L + +#define TESTED_EXTEND Extend +#include "./crc32c_extend_unittests.h" +#undef TESTED_EXTEND |