Backport autofoo simd optimization

Change-Id: I5d58154bf8266eabedf550b54f18845612f514c6
Reviewed-on: https://code.wireshark.org/review/2206
Reviewed-by: Jörg Mayer <jmayer@loplof.de>

CMakeLists.txt

@@ -169,6 +169,8 @@ if( CMAKE_C_COMPILER_ID MATCHES "MSVC")
 		# This avoids conflicts with the C++ standard library.
 		/DNOMINMAX
 	)
+	set(WIRESHARK_SIMD_TESTS
+	)
 
 	if(NOT WIN64)
 		set(LOCAL_CFLAGS ${LOCAL_CFLAGS} "/D_BIND_TO_CURRENT_CRT_VERSION=1")
@@ -313,6 +315,18 @@ else()
 		set(WIRESHARK_CPP_ONLY_FLAGS ${WIRESHARK_CPP_ONLY_FLAGS} ${WIRESHARK_EXTRA_COMPILER_CPP_ONLY_FLAGS})
 	endif()
 
+	set(WIRESHARK_SIMD_TESTS
+		-faltivec
+		-mmmx
+		-msse
+		-msse2
+		-msse3
+		-mssse3
+		-msse4.1
+		-msse4.2
+		-mavx
+	)
+
 	add_definitions(
 		-DG_DISABLE_DEPRECATED
 		-DG_DISABLE_SINGLE_INCLUDES
@@ -361,6 +375,23 @@ foreach(THIS_FLAG ${CPP_FLAG_TESTS})
 endforeach()
 message(STATUS "C-Flags: ${CMAKE_C_FLAGS}\nCXX-Flags: ${CMAKE_CXX_FLAGS}")
 
+foreach(THIS_FLAG ${WIRESHARK_SIMD_TESTS})
+	string( REGEX REPLACE "[^a-zA-Z0-9_]+" "_" F ${THIS_FLAG} )
+	set(${F} ${THIS_FLAG})
+	set(V C_${F}_VALID)
+	message(STATUS "Checking for c-compiler SIMD flag: ${THIS_FLAG}")
+	check_c_compiler_flag(${${F}} ${V})
+	if (${${V}})
+		set(WIRESHARK_SIMD_FLAGS "${WIRESHARK_SIMD_FLAGS} ${${F}}")
+	endif()
+endforeach()
+
+string(REGEX MATCH -msse4.2
+             HAVE_SSE4_2
+	     ${WIRESHARK_SIMD_FLAGS}
+)
+message( STATUS "HAVE_SSE4_2: ${HAVE_SSE4_2}" )
+
 check_c_compiler_flag(-fvisibility=hidden FVHIDDEN)
 if(FVHIDDEN)
 	set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fvisibility=hidden")

cmakeconfig.h.in

@@ -15,6 +15,9 @@
 /* Directory for data */
 #define DATAFILE_DIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATADIR}/${CPACK_PACKAGE_NAME}"
 
+/* Build wsutil with SIMD optimization */
+#cmakedefine HAVE_SSE4_2 1
+
 /* Path to Python. */
 #cmakedefine PYTHON_DIR "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_DATADIR}/${CPACK_PACKAGE_NAME}/python/${CPACK_PACKAGE_VERSION}"
 

wsutil/CMakeLists.txt

@@ -21,7 +21,7 @@
 
 include(UseABICheck)
 
-IF(WIN32)
+if(WIN32)
 	set(WSUTIL_PLATFORM_FILES
 		file_util.c
 		inet_aton.c
@@ -32,6 +32,12 @@ IF(WIN32)
 	)
 ENDIF(WIN32)
 
+if(HAVE_SSE4_2)
+	set( WSUTIL_SSE42_FILES
+		ws_mempbrk_sse42.c
+	)
+endif()
+
 set(WSUTIL_FILES
 	adler32.c
 	aes.c
@@ -76,6 +82,7 @@ set(WSUTIL_FILES
 	nghttp2/nghttp2_hd_huffman_data.c
 	nghttp2/nghttp2_helper.c
 	${WSUTIL_PLATFORM_FILES}
+	${WSUTIL_SSE42_FILES}
 )
 
 set(wsutil_LIBS
@@ -99,6 +106,13 @@ if (WERROR)
 		COMPILE_FLAGS -Werror
 	)
 endif()
+if (HAVE_SSE4_2)
+	set_source_files_properties(
+		${WSUTIL_SSE42_FILES}
+		PROPERTIES
+		COMPILE_FLAGS -msse4.2
+	)
+endif()
 
 add_library(wsutil ${LINK_MODE_LIB}
 	${WSUTIL_FILES}