Add in a vendor copy of Google Highway

CMakeLists.txt

@@ -166,6 +166,7 @@ option(ENABLE_AUTEST_UDS "Setup autest with curl using UDS (default OFF)")
 option(ENABLE_BENCHMARKS "Build benchmarks (default OFF)")
 option(EXTERNAL_YAML_CPP "Use external yaml-cpp (default OFF)")
 option(EXTERNAL_LIBSWOC "Use external libswoc (default OFF)")
+option(EXTERNAL_HWY "Use external highway (default OFF)")
 option(LINK_PLUGINS "Link core libraries to plugins (default OFF)")
 option(ENABLE_PROBES "Enable ATS SystemTap probes (default OFF)")
 option(ENABLE_VERIFY_PLUGINS "Enable plugin verification tests (default ON)" ON)
@@ -415,6 +416,11 @@ if(EXTERNAL_LIBSWOC)
   find_package(libswoc REQUIRED)
 endif()
 
+if(EXTERNAL_HWY)
+  message(STATUS "Looking for external highway")
+  find_package(HWY "1.4.0" CONFIG REQUIRED)
+endif()
+
 include(Check128BitCas)
 include(ConfigureTransparentProxy)
 

NOTICE

@@ -118,3 +118,8 @@ LS-HPACK provides functionality to encode and decode HTTP headers using
 HPACK compression mechanism specified in RFC 7541.
 Copyright (c) 2018 - 2023 LiteSpeed Technologies Inc, (MIT License)
 https://github.com/litespeedtech/ls-hpack.git
+
+~~
+
+Highway is a C++ library that provides portable SIMD/vector intrinsics.
+https://github.com/google/highway

README.md

@@ -143,6 +143,7 @@ trafficserver ............. Top src dir
 ├── lib ................... Third-party libraries
 │   ├── Catch2 ............ Unit testing framework
 │   ├── fastlz ............ Fast compression library
+│   ├── highway ........... Portable SIMD/vector intrinsics
 │   ├── ls-hpack .......... HPACK compression for HTTP/2
 │   ├── swoc .............. Solid Wall of Code utility library
 │   ├── systemtap ......... SystemTap integration

ci/rat-exclude.txt

@@ -73,6 +73,7 @@ blib/**
 **/yamlcpp/**
 **/systemtap/**
 **/swoc/**
+**/highway/**
 tests/gold_tests/autest-site/min_cfg
 tests/gold_tests/h2/rules/huge_resp_hdrs.conf
 tools/http_load/**

lib/CMakeLists.txt

@@ -78,3 +78,40 @@ add_library(systemtap::systemtap INTERFACE IMPORTED GLOBAL)
 target_include_directories(systemtap::systemtap INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}/systemtap")
 
 add_subdirectory(ls-hpack)
+
+# Currently v1.4.0
+#
+# Upstream: https://github.com/google/highway
+#
+# Source-only, preserves the readme, license, cmake
+# infrastructure and main source; does not include
+# examples, tests or documentation.
+#
+# Note that hwy/tests/list_targets.cc is retained
+# for compiled-in target information
+#
+# CMakeLists.txt slightly modified to fully disable
+# building tests if `HWY_ENABLE_TESTS=OFF`, we intend
+# to upstream this change
+if(NOT EXTERNAL_HWY)
+  message(STATUS "Using internal highway")
+  set(HWY_FORCE_STATIC_LIBS
+      ON
+      CACHE BOOL "Ignore BUILD_SHARED_LIBS" FORCE
+  )
+  set(HWY_ENABLE_INSTALL
+      OFF
+      CACHE BOOL "Install library" FORCE
+  )
+  set(HWY_ENABLE_EXAMPLES
+      OFF
+      CACHE BOOL "Build examples" FORCE
+  )
+  set(HWY_ENABLE_TESTS
+      OFF
+      CACHE BOOL "Enable HWY tests" FORCE
+  )
+  add_subdirectory(highway)
+  add_library(hwy::hwy ALIAS hwy)
+  add_library(hwy::hwy_contrib ALIAS hwy_contrib)
+endif()