diff --git a/CMakeLists.txt b/CMakeLists.txt
index 57d52c6df..6ffe6777e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -205,6 +205,11 @@ elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(xtensa)")
     set(NCNN_TARGET_ARCH xtensa)
 elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(s390x)")
     set(NCNN_TARGET_ARCH s390x)
+elseif(CMAKE_SYSTEM_PROCESSOR MATCHES "^(sw_64)")
+    set(NCNN_TARGET_ARCH sw_64)
+    #sw_64 is alpha-like platform
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mieee")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mieee")
 else()
     set(NCNN_TARGET_ARCH x86)
     option(NCNN_SSE2 "optimize x86 platform with sse2" ON)