Fix the most horrible merge I've done yet

thirdparty/blake2/CMakeLists.txt

@@ -11,33 +11,64 @@
 # To redistribute this file separately, substitute the full license texts
 # for the above references.
 
-add_library(blake2 STATIC
-	blake2.h
-)
+include(CheckCSourceCompiles)
 
-target_sources(blake2
-	PRIVATE
-	blake2b.c
-	blake2bp.c
-	blake2s.c
-	blake2sp.c
-	blake2xb.c
-	blake2xs.c
-	blake2b-load-sse2.h
-	blake2b-load-sse41.h
-	blake2b-round.h
-	blake2s-load-sse2.h
-	blake2s-load-sse41.h
-	blake2s-load-xop.h
-	blake2s-round.h
-	blake2-config.h
-	blake2-impl.h
-)
+CHECK_C_SOURCE_COMPILES("
+#if __x86_64 || __x86_64__ || __amd64 || __AMD64 || _M_X64
+// x86-64 target system
+#else
+#error Not building for x86-64
+#endif
+int main() {}
+" HAVE_X86_64)
 
-include(CheckCCompilerFlag)
-CHECK_C_COMPILER_FLAG("-msse2" HAVE_CFLAG_MSSE2)
-target_compile_definitions(blake2 PRIVATE -DHAVE_SSE2)
-if(HAVE_CFLAG_MSSE2)
-	target_compile_options(blake2 PUBLIC -msse2)
+option(BLAKE2B_USE_SSE2 "Use SSE2 instructions for BLAKE2b" ${HAVE_X86_64})
+
+if (BLAKE2B_USE_SSE2)
+	add_library(blake2 STATIC
+		sse/blake2.h
+	)
+
+	target_sources(blake2
+		PRIVATE
+		sse/blake2b.c
+		sse/blake2bp.c
+		sse/blake2s.c
+		sse/blake2sp.c
+		sse/blake2xb.c
+		sse/blake2xs.c
+		sse/blake2b-load-sse2.h
+		sse/blake2b-load-sse41.h
+		sse/blake2b-round.h
+		sse/blake2s-load-sse2.h
+		sse/blake2s-load-sse41.h
+		sse/blake2s-load-xop.h
+		sse/blake2s-round.h
+		sse/blake2-config.h
+		sse/blake2-impl.h
+	)
+
+	include(CheckCCompilerFlag)
+	CHECK_C_COMPILER_FLAG("-msse2" HAVE_CFLAG_MSSE2)
+	target_compile_definitions(blake2 PRIVATE -DHAVE_SSE2)
+	if(HAVE_CFLAG_MSSE2)
+		target_compile_options(blake2 PUBLIC -msse2)
+	endif()
+	target_include_directories(blake2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/sse)
+else()
+	add_library(blake2 STATIC
+		ref/blake2.h
+	)
+
+	target_sources(blake2
+		PRIVATE
+		ref/blake2bp-ref.c
+		ref/blake2b-ref.c
+		ref/blake2sp-ref.c
+		ref/blake2s-ref.c
+		ref/blake2xb-ref.c
+		ref/blake2xs-ref.c
+		ref/blake2-impl.h
+	)
+	target_include_directories(blake2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR}/ref)
 endif()
-target_include_directories(blake2 PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})